RMU-A Module BASICS Flow Monitor

RMU-A Module BASICSFlow Monitor

Operation instructions

Series RMU-AType RMU-A11 thru RMU-A15

Read this manual prior to performing any task!

RMU-A Module BASICS, 1, en_US

© Meister Strömungstechnik GmbH 2019

Meister Strömungstechnik GmbH

Im Gewerbegebiet 2

63831 Wiesen

Germany

Telephone: +49 6096 9720 - 0

Fax: +49 6096 9720 - 30

E-mail: [email protected]

Internet: www.meister-flow.com

These instructions were compiled by:

Meister Strömungstechnik GmbH

Subject to change without notice

12.12.2019RMU-A Module BASICS Flow Monitor2

These instructions facilitate the safeand efficient handling of a flow monitor(referred to as "device" in the fol-lowing). The instructions are an inte-gral part of the device and must bekept within easy reach for the per-sonnel in the immediate vicinity of thedevice at all times. Personnel mustcarefully read and understand theseinstructions before commencing allwork. The basic requirement for safework is adherence to all safety andhandling instructions stipulated inthese instructions. The local accident-prevention regulations and generalsafety standards and regulations forthe field of application of the devicealso apply. Illustrations in theseinstructions are provided to aid generalunderstanding and might deviate fromthe actual model. No claims can bederived from any such differences.

Limitations of liability

All details and instructions in thismanual have been compiled underconsideration of the valid standardsand regulations, the current state-of-technology and our many years ofknowledge and experience. The manu-facturer does not accept any liabilityarising from:

n non-observance of any details inthese instructions

n improper use of the device, or usethat is not in accordance withthese instructions

n use of non-trained personnel

n unauthorized retrofitting or tech-nical changes that have not beenauthorized by the manufacturer

n use of non-approved replacementparts

The duties and obligations agreedupon in the delivery contract apply infull, as well as the general terms andconditions, the terms of delivery by themanufacturer and the valid legal regu-lations applicable at the conclusion ofthe contract.

Copyright

These operating instructions are pro-tected by copyright.

Except for internal purposes, transferof these instructions to third-parties,copying them in any way– even in part – as well as dissemina-tion and/or communication of their con-tent is forbidden without prior writtenauthorization from Meister Strömung-stechnik ("manufacturer"). Violationsare subject to claims for indemnifica-tion. The manufacturer reserves theright to assert additional claims.

Copyright is the property of the manu-facturer.

© Meister Strömungstechnik GmbH

Im Gewerbegebiet 2

63831 Wiesen

Germany

Supplemental directives

12.12.2019 RMU-A Module BASICS Flow Monitor 3

Table of contents1 Overview..................................................................................................... 7

1.1 Short description.................................................................................. 71.2 Warranty and guarantee provisions..................................................... 71.3 Customer service................................................................................. 7

2 Safety.......................................................................................................... 82.1 Explanation of symbols........................................................................ 82.2 Correct use in accordance with these instructions............................ 102.3 Special precautions........................................................................... 102.3.1 Hazards from electrical current....................................................... 112.3.2 Mechanical hazards........................................................................ 122.3.3 Hazards from high or low temperatures......................................... 132.3.4 Radiation hazards........................................................................... 132.3.5 Hazards caused by media.............................................................. 142.4 Personnel requirements.................................................................... 142.5 Personal safety equipment................................................................ 152.6 Protective systems............................................................................ 162.7 Replacement parts............................................................................ 162.8 Environmental protection................................................................... 172.9 Responsibility of the owner................................................................ 17

3 Design and function................................................................................. 203.1 Overview............................................................................................ 203.2 Device description............................................................................. 203.3 Component description...................................................................... 21

4 Transport, packaging and storage......................................................... 224.1 Safety instructions for transport......................................................... 224.2 Transport inspection.......................................................................... 224.3 Packaging.......................................................................................... 224.4 Symbols on the shipping box............................................................. 234.5 Storage.............................................................................................. 23

5 Installation and initial startup................................................................. 255.1 Safety................................................................................................ 25

Table of contents


5.2 Requirements at the place of installation........................................... 255.3 Preparatory work............................................................................... 265.4 Installation in the pipe line................................................................. 295.5 Initial startup...................................................................................... 325.6 Electrical connection.......................................................................... 345.6.1 Plug connector EN175301-803...................................................... 345.6.2 Plug connector M12x1.................................................................... 345.6.3 Cable.............................................................................................. 355.6.4 Degree of protection (IP-Code)...................................................... 355.7 Grounding the device........................................................................ 355.8 Plug connection................................................................................. 355.9 Contact protection measures............................................................. 35

6 Operation.................................................................................................. 376.1 Setting the switch point...................................................................... 376.2 Checking the flow.............................................................................. 39

7 Troubleshooting....................................................................................... 407.1 Safety................................................................................................ 407.2 Troubleshooting guide....................................................................... 42

8 Maintenance............................................................................................. 448.1 Safety................................................................................................ 448.2 Maintenance plan.............................................................................. 448.3 Removal from the pipe system.......................................................... 458.4 Disassembly...................................................................................... 478.5 Maintenance...................................................................................... 508.5.1 Cleaning......................................................................................... 508.5.2 Parts replacement.......................................................................... 518.5.3 Assembly........................................................................................ 518.5.4 Switch contact replacement............................................................ 548.6 Measures to be taken after maintenance work.................................. 55

9 Disassembly and disposal...................................................................... 569.1 Safety................................................................................................ 569.2 Disassembly...................................................................................... 56

Table of contents


9.3 Return Materials................................................................................ 579.3.1 Return Materials Authorization....................................................... 579.4 Disposal............................................................................................. 57

10 Technical data.......................................................................................... 5810.1 Device data plate............................................................................. 5810.2 Switch contact rating plate............................................................... 5810.3 Dimension sheet.............................................................................. 5910.4 General specifications..................................................................... 6010.5 Electrical specifications................................................................... 6010.6 Measuring ranges............................................................................ 6110.6.1 Standard measuring ranges......................................................... 6110.7 Operating data................................................................................. 61

11 Appendix................................................................................................... 6211.1 Tightening torque............................................................................. 6211.2 Replacement parts........................................................................... 6211.3 Tools................................................................................................. 6411.4 Sealant............................................................................................. 6411.5 Lubricants........................................................................................ 65

12 Index.......................................................................................................... 66

Table of contents


1 Overview1.1 Short description

Fig. 1: RMU-A flow monitor

1 Switch point adjustment scale2 Switch contact with connection

cable

The flow monitor RMU-A monitors thecontinuous flow of liquids. It isdesigned for installation in pipe sys-tems.

A float inside the device is moved bythe medium flowing through it. Thedesired switch point can be set on theswitch point adjustment scale,whereby the arrow on the switch con-tact is aligned to the desired volumeflow value on the switch point adjust-ment scale.

The cable can be connected toexternal measuring devices.

1.2 Warranty and guar-antee provisions

Warranty and guarantee provisions arecontained in the general terms andconditions of Meister Strömungs-technik.

1.3 Customer serviceFor technical support, please contactour customer service department (forcontact details, see Page 2).

Furthermore, our staff is always inter-ested in receiving new information andexperiences gained from application ofthe device, which may be useful inimproving our products.

Overview

Customer service


2 SafetyThis chapter provides an overview ofimportant safety aspects required foroptimum protection of personnel aswell as for safe installation and safeoperation of the device.

Non-observance of the handling andsafety instructions listed in this manualmay result in hazardous/dangerousconditions and in damage to property.

2.1 Explanation of sym-bols

Safety instructions

Safety instructions in this manual aremarked by symbols. The safetyinstructions are preceded by signalwords that indicate the level of danger/hazard.

To prevent accidents or injury to per-sons as well as damage to property,always observe the safety instructionsand proceed carefully.

DANGER!

This combination of symbol andsignal word indicates an imme-diate, dangerous condition thatresults in death or serious injuryif it is not avoided.

WARNING!

This combination of symbol andsignal word indicates a possiblydangerous condition that mightresult in death or serious injuryif it is not avoided.

Safety

Explanation of symbols


CAUTION!

This combination of symbol andsignal word indicates a possiblydangerous condition that mightresult in minor or slight injury ifit is not avoided.

NOTICE!

This combination of symbol andsignal word indicates a possiblydangerous condition that mightresult in damage to propertyand to the environment if it isnot avoided.

Tips and recommendations

This symbol emphasizes usefultips and recommendations aswell as information for efficientand failure-free operation.

Signs used in these instructions

The following signs and highlightingsare used in these instructions to iden-tify handling instructions, the descrip-tion of results, lists/enumerations, ref-erences and other elements:

Designates step-by-step han-dling instructions

ð Designates a state or anautomatic sequence as aresult of a specific operatingstep

n Designates randomly ordered enu-merations and list entries

Ä “Signs used in these instructions”on page 9, designates references tochapters in these instructions

Safety

Explanation of symbols


2.2 Correct use inaccordance withthese instructions

The device is designed and con-structed exclusively for the intendeduse described herein.

Table 1: Correct use in non-hazardareas

The flow monitor serves exclusivelyto monitor the continuous flow of liq-uids within a temperature range of-20 °C to 100 °C (optional: 160 °C)at a maximum operating pressure of250 bar (brass version).

Correct use in explosion-hazardzones

Explosion-proof switch contacts arecurrently not available for the RMU-Aseries flow monitor.

Any additional or different application,above and beyond the correct use inaccordance with these instructions, isdeemed as incorrect use.

WARNING!

Danger due to incorrect use!Incorrect use of the flow mon-itor may result in dangerousconditions.

– Use the flow monitor onlywithin the stipulated per-formance limits

– Do not subject the flowmonitor to severe tempera-ture fluctuations

– Do not use the flow monitorwith quick acting valves

– Do not use the flow monitorwith solenoid valves

– Do not subject the flowmonitor to vibrations

– Do not subject the flowmonitor to pressure surges

– Do not use the flow monitorwith media containingsolids or abrasives

– Use the flow monitor onlywith media previouslyapproved by the manufac-turer

– Do not use the flow monitoras the sole monitoringdevice to prevent dan-gerous conditions

– Do not install the flow mon-itor as a supporting partwithin a pipeline system

– The flow monitor must beinstalled so that it is pro-tected from damage bymechanical force. If neces-sary, install an appropriateimpact protection device.

All claims for damages due to incorrectuse are excluded.

2.3 Special precautionsThe following section lists residualrisks that might arise from the device.

Safety

Special precautions


To reduce health risks and preventdangerous conditions, observe thesafety instructions listed here as wellas the safety instruction in the otherchapters of these Operating Instruc-tions.

DANGER!

RMU-A devices are not suit-able for employment in explo-sion hazard zones.

These Operating Instructionscannot cover all conceivabledangers because many dan-gers arise, not from the deviceitself, but from the respectivemedia flowing through it.Always observe the appropriatesafety data sheets when usinghazardous media!

2.3.1 Hazards from elec-trical current

Electrical current

DANGER!

Danger to life from electricalcurrent!There is an immediate risk tolife from electrocution ontouching live parts. Damagedelectrical insulation or compo-nents can be extremely dan-gerous.

– Only qualified electriciansshall work on the electricalsystem.

– If the insulation is dam-aged, immediately switchoff and have repairs per-formed.

– Before commencing workon live parts of the elec-trical systems and oper-ating equipment, discon-nect the equipment andensure that it remains dis-connected for the durationof the work. Observe these5 safety rules when doingso:– Isolate (disconnect)– Secure against

switching back on– Check for absence of

voltage– Ground and short

Safety

Special precautions > Hazards from electrical current


– Cover or cordon offother live parts in thevicinity

– Never bridge fuses or putthem out of operation.Always observe the correctcurrent ratings whenreplacing fuses

– Keep moisture away fromlive parts. This can result inshort-circuit

2.3.2 Mechanical hazards

WARNING!

Risk of injury due to frac-tured housing and leakage!Unauthorized temperatures orexcessive pressure may causethe flow monitor body or theprocess connections to burst.Injury may be caused by flyingdebris and escaping media.

– Keep within the stipulatedoperating limits

– Wear personal protectiveequipment

– Avoid severe temperaturefluctuations

– Avoid pressure surges

WARNING!

Risk of injury on sharp edgesand pointed corners!Sharp edges and pointed cor-ners can cause abrasions andskin cuts.

– Proceed with caution whenworking near sharp edgesand pointed corners

– If in doubt, wear protectivegloves

Safety

Special precautions > Mechanical hazards


2.3.3 Hazards from highor low temperatures

Hot or cold surfaces

WARNING!

Risk of injury from hot orcold surfaces!Surfaces of components mayheat up/cool down dramaticallydue to the media flowingthrough them. Skin contact withhot or cold surfaces may causesevere skin burn or frostbite.

– Always wear temperature-resistant protective workclothing and protectivegloves when working nearhot/cold surfaces

– Before commencing work,make sure that all surfaceshave been cooled down orwarmed up to ambient tem-perature

2.3.4 Radiation hazardsStrong magnetic fields

WARNING!

Danger to life from strongmagnetic fields!Strong magnetic fields maycause severe injury or even befatal, as well as cause consider-able damage to property.

– Persons with pacemakersmust not be located in thevicinity of the device. Thiscould impair the function ofthe pacemaker

– Persons with metalimplants must not belocated in the vicinity of thedevice. Implants can heatup or be attracted magneti-cally

– Keep ferromagnetic mate-rials and electromagnetsaway from the magneticsource. These materialscould be attracted and flythrough the room, therebyinjuring or even killing per-sons. Minimum clearance:3 m

– Remove and put awaymetal objects before main-tenance work (jewelry,watches, writing imple-ments, etc.)

Safety

Special precautions > Radiation hazards


– Do not place any electronicdevices within the vicinity ofthe magnetic source.These could be damaged

– Do not place any electronicstorage media, creditcards, etc. within thevicinity of the magneticsource. Data could bedeleted

2.3.5 Hazards caused bymedia

Hazardous media

WARNING!

Risk of injury from hazardousmedia!If the flow monitor is used fortoxic, corrosive or very hot/coldmedia, there is a risk of seriousinjury from escaping media.

– Observe details in thesafety data sheet of themedia

– Comply with the safety,accident prevention andenvironmental protectionregulations appropriate tothe media used

– Wear personal protectiveequipment in accordancewith the safety data sheet

2.4 Personnel require-ments

WARNING!

Risk of injury due to insuffi-ciently trained and qualifiedpersonnel!If unqualified personnel work onthe device or are located withinits hazard zone, dangers arisewhich may result in seriousinjury and considerabledamage to property.

– All work must be performedby qualified personnel only.

– Keep unqualified personnelaway from hazard zones.

Authorized personnel is to berestricted to those persons who can beexpected to perform their work reliably.Persons whose ability to respond isinfluenced, e.g. by drugs, alcohol ormedication, are not authorized.

Observe the age and occupational reg-ulations at the site when choosing per-sonnel.

Safety

Personnel requirements


The following lists the personnel quali-fications for the various areas ofactivity:

Qualified electricianDue to specialized training, knowledgeand experience as well as knowledgeof the relevant standards and regula-tions, the qualified electrician is able toindependently perform work on theelectrical systems as well as to detectand avoid possible risks and dangers.

Additionally, the electrician must pro-vide proof of his/her professional quali-fication that certifies his/her ability toperform work on electrical systems.

The qualified electrician must fulfill therequirements contained in the validlegal accident-prevention regulations.

Qualified personnelDue to their specialized training,knowledge and experience as well astheir knowledge of the relevant stand-ards and regulations, qualified per-sonnel are able to independently per-form the work assigned to them as wellas to detect and avoid possible risksand dangers.

2.5 Personal safetyequipment

Personal safety equipment is used toprotect personnel from hazards/dangers that might impair their safetyor health during work.

When performing the various tasks at,and with the device, personnel mustwear personal safety equipment. Spe-cial reference is made of this in theindividual chapters within these Oper-ating Instructions. The following pro-vides a description of the personalsafety equipment:

n Always wear appropriate personalsafety equipment required in thevarious chapters of these Oper-ating Instructions before com-mencing work.

n Comply with the personal safetyequipment instructions postedwithin the work area.

Description of personal safetyequipment

As specified in the Safety DataSheet of the medium, protectiveequipment must be worn when han-dling hazardous media. In addition,the specifications of the systemoperator must be followed. If noprotective equipment is specified,suitable protective gloves and gog-gles must be worn.The protective equipment is used toprotect against hazardous media leaksand hazardous media residue in thedevice.

Goggles

Safety

Personal safety equipment


The goggles are used to protect theeyes from flying debris and splashingfluid.

Protective gloves

Protective gloves protect the handsfrom friction, burns, grazing, abrasion,surface cuts or deeper injuries, as wellas from direct contact with hot or coldsurfaces.

2.6 Protective systemsIntegration within an emergency-stop concept is required

The device is designed for use as apart of a machine or system. It doesnot have its own controller and doesnot have an autonomous emergency-stop function.

Before starting up the device, installthe emergency-stop equipment andincorporate it into the safety chain ofthe machine or system.

Connect the emergency-stop equip-ment so that if there is an interruptionin the power supply or in the activationof the power supply after an interrup-tion, dangerous conditions areexcluded for persons and valuables.

The emergency-stop equipment mustalways be freely accessible.

2.7 Replacement parts

WARNING!

Risk of injury due to use ofincorrect replacement parts!Use of incorrect or faultyreplacement parts may result indangers to personnel as well asdamages, malfunctions or totalfailure.

– Only use original replace-ment parts from the manu-facturer or approved by themanufacturer.

– Always contact the manu-facturer in case of doubt.

Always purchase replacement partsfrom an authorized dealer or directlyfrom the manufacturer (For contactdetails, see Page 2).

The replacement parts list is in theannex.

Safety

Replacement parts


2.8 Environmental pro-tection

NOTICE!

Risk to the environment dueto improper handling of envi-ronmentally hazardous sub-stances!Serious environmental damagemay result if substancesharmful to the environment arehandled incorrectly, especially ifthey are disposed of improperly.

– Always observe the instruc-tions listed below on thehandling and disposal ofsubstances harmful to theenvironment.

– If harmful substances arereleased into the environ-ment, take immediatecountermeasures. If thereis doubt, contact the localauthorities, inform them ofthe damage and requestinformation on suitablecountermeasures to betaken.

Cleaning fluids

Solvent-based cleaning fluids containtoxic substances. They must never bereleased into the environment andmust be disposed of by a waste man-agement company.

Lubricants

Lubricants such as greases and oilscontain toxic substances. They mustnever be released into the environ-ment and must be disposed of by awaste management company.

2.9 Responsibility ofthe owner

Owner

The owner is the person who operatesthe device himself for business orcommercial purposes or who cedessuch use/application to a third-partyand who, during operation of thedevice, has full legal product steward-ship for protection of the user, the per-sonnel or third-parties.

Duties of the owner

The device is used in the commercialsector. The owner of the device istherefore subject to legal obligationspertaining to work safety.

In addition to the safety instructionscontained in these Operating Instruc-tions, the safety, accident preventionand environmental protection regula-tions applicable to the field of applica-tion of the device must be observed.

Safety

Responsibility of the owner


In particular, this includes:

n The owner must inform himselfregarding the valid health andsafety regulations and must per-form a risk assessment to addi-tionally determine the risksresulting from the special workconditions arising at the location atwhich the device is used, espe-cially in regard to the media used.He must then implement thesewithin Operating Instructions foruse of the device.

n For the USA:The "Occupational Health andSafety Act" of 1970 stipulates thatit is the duty of the owner to pro-vide a safe workplace. He musthereby ensure that the device isoperated and maintained com-pliant to valid commercial, indus-trial, local, federal and state laws,standards and regulations.

n For Canada:The "Canadian Centre for Occupa-tional Health and Safety Act" of1978 stipulates that all Canadianshave “…a fundamental right to ahealthy and safe working environ-ment.” It is therefore the duty ofthe owner to provide a safe work-place. He must ensure that thedevice is operated and maintainedcompliant to valid commercial,industrial, local, provincial, territo-rial and federal laws, standardsand regulations.

n Appropriate to the working condi-tions and the media used, theowner must affix signs within theworking area that inform the userof the hazards and dangerspresent.

n During the entire period of use ofthe device, the owner must checkperiodically to ensure that theOperating Instructions correspondto the current state of regulations,and he must make adjustments asnecessary.

n The owner must clearly regulateand determine responsibilities forinstallation, operation, trouble-shooting, maintenance andcleaning.

n The owner must fit/retrofit suitablesafety equipment within the com-plete plant/system.

n The owner must ensure that allstaff/personnel have thoroughlyread and understand theseinstructions before handling thedevice. Additionally, he must trainthe personnel at regular intervalsand warn them of dangers.

n The owner must provide the per-sonnel with the required safetyequipment and must instruct themthat its wear is mandatory.

Additionally, the owner is responsiblefor ensuring that the device is alwayskept in a technically perfect condition.The following therefore applies:

Safety



n The owner must implement suit-able safety measures, appropriateto the media used.

n Different media have differentseverities of influence on thesoiling and wear of/to the device.The owner must set suitable main-tenance intervals, depending onthe media flowing through thedevice.

n The owner must ensure that themaintenance intervals described inthese Operating Instructions areadhered to at all times.

n The owner must ensure that thedevice is completely free of allresidual media before disposal.Remains of corrosive or toxicmaterials must be neutralized.

Safety



3 Design and function3.1 Overview

Fig. 2: Overview

1 Device body2 Switch contact with cable3 Switch point adjustment scale

3.2 Device descriptionRMU-A flow monitors work accordingto the functional principle of the vari-able area flow meter. The flow monitoris installed into a pipe line system andmeasures the flow rate of the mediumflowing through the pipe line.

A float inside the flow monitor ismoved by the flowing medium. A mag-netic field is generated by the magnetsinside the float. The position of thefloat is detected by a switch contact.The desired switch point can be set onthe switch point adjustment scale bymoving the switch contact.

Applications for RMU-A flow monitorsare, for example, cooling circuits. Thedevice monitors the volume flow of thecooling media to ensure sufficientcooling. If the flow drops below thethreshold set by the operator, theswitch contact opens (Normally OpenContact).

Design and function

Device description


3.3 Component descrip-tion

Switch contact

Fig. 3: Switch contact with connectioncable

A potential-free Reed contact is castinto the switch contact (Fig. 3/1). Thedevice is supplied with a connectioncable.

Switch point adjustment scale

Fig. 4: Switch point adjustment scale

A scale is applied to the device body,to which the desired switch point canbe adjusted.

Design and function

Component description


4 Transport, packaging and storage4.1 Safety instructions

for transport

Improper transport

NOTICE!

The device could be dam-aged if transported improp-erly!Objects to be transported mayfall or overturn if transportedimproperly. This may result indamage to the device and/orproperty.

– Proceed carefully whenunloading transportedpackages, both on deliveryand when transporting in-house. Observe the sym-bols and instructions on theshipping box

– Remove packaging mate-rial just prior to assembly

4.2 Transport inspec-tion

On delivery, make an immediate checkfor completeness and check for trans-port damages.

If there are any visible external trans-port damages, proceed as follows:

n Do not accept the deliveryn Note the damage in the shipping

documents or on the delivery noteof the transporter and have thedriver confirm by signature

n Initiate a claim for damages

Make a claim for each fault assoon as it is detected. Claimsfor damages can only beinvoked within the valid claimperiods.

4.3 PackagingAbout packaging

The packaging serves to protect theindividual components from transportdamages, corrosion and other dam-ages until they are installed. Do notdiscard the packaging and onlyremove the device from the shippingbox immediately before installation.

Transport, packaging and storage

Packaging


Handling packaging materials

Dispose of packaging material inaccordance with the valid legal regula-tions and local ordinances.

NOTICE!

Danger to the environmentdue to incorrect disposal!Packaging is made of valuableraw materials and can bereused in many cases or use-fully processed and recycled.Improper disposal of packagingmaterials may pose a danger tothe environment.

– Dispose of packagingmaterial in an environmen-tally safe manner

– Comply with the local dis-posal regulations. If neces-sary, have the packagingdisposed of by approvedspecialists.

4.4 Symbols on theshipping box

Top

The arrows indicate the top side of thepackage. They must always pointupwards, otherwise the content maybe damaged.

Fragile

Designates packages with breakableor damageable contents.

Handle the package carefully and donot allow it to fall or be subjected tojarring or severe vibration.

4.5 StorageStoring the packages

Store the packages under the followingconditions:

n Do not store in the openn Store dry and dust-freen Do not subject to any aggressive

median Protect from direct sunlightn Avoid mechanical vibrations and

shocksn Storage temperature: 0 to 35 °C /

32 °F to 95 °Fn Relative humidity: max. 60 %n Do not stackn If storing for longer than 3 months,

regularly check the general condi-tion of all parts as well as of thepackaging.


Storage


Storage instructions in additionto the instructions listed heremay be listed on the packages.Follow these instructions also.


Storage


5 Installation and initial startup5.1 SafetyIncorrect installation and initialstartup

WARNING!

Risk of injury due to incorrectinstallation and initialstartup!Incorrect installation and initialstartup may result in severeinjury and considerabledamage to property.

– Ensure that the site is suffi-ciently cleared of obstruc-tions before commencingwork

– Handle open or sharpedged components care-fully

– Ensure that the assemblylocation is orderly andclean! Parts and tools lyingabout or on top of eachother are potential causesfor accidents

– Assemble componentsproperly. Observe the stipu-lated tightening torque ofscrews

– Before initial startup, makesure that all installationwork has been performedand completed in compli-ance with the specificationsand instructions in theseOperating Instructions

Safeguard against restart

WARNING!

Danger to life due to unau-thorized restart!There is a risk of severe oreven fatal injury due to unau-thorized restart of the powersupply during installation.

– Before commencing work,switch off the power supplyto the entire system/plantand secure against restart

5.2 Requirements at theplace of installation

The place of installation must meet thefollowing requirements:

n The device must not be underwater.

n The surrounding area must be suf-ficiently illuminated.

n There must be sufficient space toprevent accumulation of trappedheat.

n The device must not be installedas a supporting part in a pipe con-struction.

n The device may not have anythingaffixed to, or suspended from it.

Installation and initial startup

Requirements at the place of installation


n The flow monitor must be installedin such a way as to precludedamage by outside force. It mustbe ensured that the flow monitorcannot be damaged. If necessary,install an appropriate impact pro-tection device.

n External magnetic fields will influ-ence the switch contact. Keep suf-ficient distance to magnetic fields(e.g. electric motors).

n Piping, process connections orsupports made of ferromagneticmaterial influence the magneticfield of the device. Keep a spaceof minimum 100 mm to thosematerials (e.g. steel).

5.3 Preparatory workThe following requirements must bemet during installation to ensure cor-rect functioning of the flow monitor:

WARNING!

Danger due to incorrectinstallation!If the requirements are not metwhen installing the flow monitor,dangerous/hazardous condi-tions may arise.

– Do not install the flow mon-itor as a supporting part ina pipe system

– Do not use the flow monitorwith quick-acting valves

– Do not use the flow monitorwith solenoid valves

Installation position/direction offlow

Fig. 5: Installation position/direction offlow

Install the flow monitor only in one ofthe positions displayed in the drawing.The medium must flow in the directionof the arrow (from a low to a high scalevalue).


Preparatory work


Unimpeded flow sections

NOTICE!

Measuring inaccuracy due toincorrect installation!The measuring accuracy of theflow monitor is influenced by itsposition within the pipe system.Changes in cross-section,branch-offs or bends in the pipeline system impair measuringaccuracy.

– Ensure that the unimpededflow sections are main-tained

– Never reduce the hosediameter immediatelybefore the device

We recommend unimpededflow sections, type BS-228. Fig. 6: Unimpeded flow sections

1 10x DN2 5x DN

n An unimpeded flow section of10xDN (rated width) must bemaintained before the device.

n An unimpeded flow section of5xDN (rated width) must be main-tained after the device.


Preparatory work


Unimpeded outlet

Fig. 7: Unimpeded outlet

If the pipe line ends at an unimpededoutlet, the flow monitor must not beinstalled directly in front of theopening. The device must always becompletely filled with media to ensuremeasuring accuracy.

Strainer

Fig. 8: Strainer

1 min. 10x DN2 min. 5x DN


Preparatory work


If the medium is contaminated bysolids, a strainer must be installedbefore the device (Fig. 8).

We recommend a Type SF,SFD or SFM strainer.

Prepare the device

NOTICE!

Risk of damage to propertydue to contamination!Contamination and depositsmay impair the free movementof the float, thereby damagingthe device.

– Ensure that there are noforeign particles in thedevice

– Ensure that the device isnot soiled

– Do not use any mediumcontaining solids

Due to quality assurance meas-ures, there may be some testmedium (water) residue in thedevice.

1. Unpack the device and visuallyinspect the device to ensure thatit is free of packaging materials

2. Examine the device for residueof test medium and drain, if nec-essary

3. Check the device for soiling andflush with clean medium, if nec-essary

5.4 Installation in thepipe line

WARNING!

Risk of injury from pressur-ized lines!If the pipe system is underpressure when installing thedevice, severe injuries mayresult.

– Depressurize the pipesystem before installing thedevice


Installation in the pipe line


WARNING!

Risk of injury from hot orcold surfaces!Pipe lines can heat up/cooldown dramatically due to themedia flowing through them.Skin contact with hot or coldsurfaces may cause severeskin burn or frost bite.

– Before commencing work,ensure that the system hasbeen controlled to a tem-perature range between 0and 40 °C

– Do not touch any parts ofthe system that are eithervery hot or very cold.

– Always wear heat-resistant/cold-resistant protectiveclothing and protectivegloves when working nearhot/cold surfaces.

WARNING!

Risk of injury from media inthe pipe system!If the pipe system contains haz-ardous media, severe injuriesmay be caused by escapingmedia.

– Before installation, ensurethat the pipe system isempty and does not con-tain media residue

– Always wear personal pro-tective equipment duringinstallation

– Provide suitable drainingdevices (collection tanks,etc.)

NOTICE!

Risk of damage to the devicedue to contamination in thepipe line system!Dirt and foreign particlesentering the device candamage the device and impairits operation.

– Ensure that the pipesystem is clean beforeinstalling the device

– If necessary, flush the pipesystem with clean mediumbefore installation




A suitable sealant must beselected depending on the con-dition/composition of the hoselines, the medium and the oper-ating and environmental condi-tions. The sealing methoddescribed here is only anexample and cannot be used inall cases.

Sealing the pipe connection

Personnel:n Qualified personnel

1. Nap the thread

Fig. 9: Apply sealing thread

2. Apply sealing thread (Fig. 9/1) tothe napped area in the threadeddirection. Observe the quantityrecommended by the sealantmanufacturer.

Fig. 10: Pipe connection with sealingthread

ð The pipe line is now readyfor assembly (Fig. 10)




Install device in the pipe system


Protective equipment:n Protective gloves

Tools:n Fixed spanner

CAUTION!

Do not hold the device by itsthreads. These are sharpedged and may cause injury

1. Place the threaded end of thedevice onto the thread of theconnecting pipe

Fig. 11: Screw in the device

2. Fasten the adapter union of thepipe line with an appropriatespanner (Fig. 11/2). When doingso, lock the process connectionof the device in place to preventslip, using a suitable spanner(Fig. 11/1).

Fig. 12: Screw in the device

3. Keep turning in the adapterunion (Fig. 12/2) while holdingthe process connection of thedevice locked (Fig. 12/1) untilthe connection is tight.

4. Repeat these steps at the otherend of the device.

5.5 Initial startupThe following steps must be takenbefore initial startup and any subse-quent startup (e.g. after removal andinstallation during maintenance).


Initial startup


1.

WARNING!

Ensure that the plant isoperating vibration-free.Vibrations could destroythe device. This mayresult in serious injury tothe user.

2.

WARNING!

Ensure that the mediumis flowing continuously.Pulse-like staggeredloads could destroy thedevice. This may result inserious injury to the user.

3.

NOTICE!

Completely fill the pipe-lines. Partial filling(s) mayresult in malfunctionsand damage to thedevice.

4.

NOTICE!

Vent the pipeline. If thereare air pockets in the lineduring the measurement,this could result indamage to the devicecaused by hydraulicshock. This may causemalfunctions.

5.

NOTICE!

Ensure that the plant isoperating without cavita-tion. Cavitation mayresult in malfunctionsand damage to thedevice.


Initial startup


5.6 Electrical connec-tion

The electrical connection of the flowmonitor is accomplished through thecast on power cable. The switch con-tacts employed in these devices arepotential free and do not require apower source. Switch contact and flowmonitor have been optimally harmon-ized. After replacement of a switchcontact, the switch point must be read-justed.

DANGER!

Danger to life from electricalcurrent!There is an immediate risk oflife from electrocution ontouching live parts. Damage tothe electrical insulation orsingle components can beextremely dangerous.

– Only qualified electriciansshall work on the electricalsystem

– If the insulation is damagedthen immediately switch offand have repairs carriedout

– Before commencing workon live parts of electricalsystems and components,disconnects the equipmentand ensure that it remainsdisconnected for the dura-tion of the work. Observethese 5 rules when doingso:

– Isolate (disconnect)– secure against

switching back on– Check for absence of

voltage– Ground and short– Cover or cordon off

other live parts in thevicinity

– Never bridge fuses or putthem out of operation.Always observe the correctcurrent ratings whenreplacing fuses

– Keep moisture away fromlive parts. This can result inshort circuit

5.6.1 Plug connectorEN175301-803

Not available for this device series

5.6.2 Plug connectorM12x1

Not available for this device series


Electrical connection > Plug connector M12x1


5.6.3 CableThe individual cores of the cable arenumbered according to the followingconnection diagram.

Wiring diagram

normally open:

2 1

Cable

Fig. 13: Switch position under no-flowcondition

5.6.4 Degree of protection(IP-Code)

The specified degree of protection (IP)is only ensured if approved connectionmaterial is used (see following table).

Deviceconnec-tion

Specifica-tion ofconnec-tion mate-rial

Degree ofprotection

Cable - IP67

5.7 Grounding thedevice

When installing the device in a pipesystem, ensure that the device isgrounded to the pipe system to avoid adangerous electrical potential differ-ence.

5.8 Plug connectionPersonnel:n Qualified electrician

For devices of the RMU-A series, onlyswitch contacts with sealed-in connec-tion cables are available.

5.9 Contact protectionmeasures

The Reed-switches used in the switchcontacts are designed to be very sen-sitive to overload. To prevent destruc-tion of the switch contact, the valuesspecified on the rating plate of theswitch contact must never beexceeded (not even temporarily).

There is a risk of overload from:

n inductive loadsn capacitive loadsn ohmic loads.

Suitable measures must be taken toprotect against overload (see followingexamples):

Inductive load

There is danger of voltage peaks frominductive loads when switching off (upto 10 times the rated voltage). Induc-tive loads are caused by, e.g.:

n Contactors, relaysn Solenoid valvesn Electric motors


Contact protection measures


Examples of protective measures:

Fig. 14: Example 1

Fig. 15: Example 2

Capacitive loads

There is a danger of high currentpeaks from capacitive loads whenswitching-on the switch contact(exceeding rated current). Capacitiveloads are caused by, e.g.:

n Long connecting cablesn Capacitive consumers

Example of protective measure:

Fig. 16: Protective measure againstcapacitive loads

Ohmic loads

There is a danger of high currentpeaks from ohmic loads whenswitching-on the switch contact. Thereason for this is that the glow filamenthas a low resistance at low tempera-tures. Ohmic loads are caused by,e.g.:

n Filament bulbsn Motors during startup

Examples of protective measures:

Fig. 17: Example 1

Fig. 18: Example 2

Protection against ohmic loads can beachieved through installation of aresistor in the circuit, or by heating theglow filament. For connection to high-impedance consumers (ex. PLC), aprotective circuit is not needed.


Contact protection measures


6 Operation6.1 Setting the switch

pointSetting the switch point of aninstalled device

The following instructionsdescribe the procedure for aNormally Open Contact (NOC).The actual state (open orclosed) can be determinedusing a continuity meter.


Tools:n Hex screwdriver

Fig. 19: Loosen set screws (exampleswitch point adjustment scale)

1. Loosen the set screws of theswitch contact (Fig. 19/1) usinga hex screwdriver.

2. Slide the switch contact to theflow value to be monitored.Make sure that the arrow on theswitch contact data plate is inexact alignment with the desiredflow rate on the switch pointadjustment scale.

3. Tighten the set screws of theswitch contact (Fig. 19/1) usinga hex screwdriver. When doingso, observe the correct tight-ening torque of the screws.

Ä Chapter 11.1 “Tighteningtorque” on page 62

ð The set switch point corre-sponds to the switch-offpoint of the switch contactby decreasing flow.

Operation

Setting the switch point


Setting the switch point of a non-installed device

Fig. 20: Loosen the set screws(example switch point adjustmentscale)

1. Loosen the set screws of theswitch contact (Fig. 20/1) usinga hex screwdriver.

2. Slide the switch contact to theflow value to be monitored.Make sure that the arrow on theswitch contact data plate is inalignment with the desired flowrate on the switch point adjust-ment scale.

3. Tighten the set screws of theswitch contact (Fig. 20/1) usinga hex screwdriver. When doingso, observe the correct tight-ening torque.


ð The set switch point corre-sponds to the switch-offpoint of the switch contactby decreasing flow.

Operation

Setting the switch point


6.2 Checking the flowReading-off the flow value


Protective equipment:n Goggles

Fig. 21: Reading-off the flow value(example switch point adjustmentscale)

1. Make sure that the setting arrowand the scale mark on theswitch point adjustment scaleare in alignment (Fig. 21).

2. Look straight on. By viewing atan angle from above or below,the reading can be falsified.(Parallax error).

3. Read-off the flow value from theswitch point adjustment scale

Operation

Checking the flow


7 TroubleshootingThis chapter describes possible mal-functions of the device, their causesand repair.

If malfunctions persist or increase,shorten the maintenance interval tomeet the actual operating conditions.

For malfunctions not described in thischapter, please contact the manufac-turer (see service address on page 2).

7.1 SafetyWork performed incorrectly toremedy a malfunction

WARNING!

Risk of injury due to incorrectrepair of malfunction!Work performed incorrectly mayresult in severe injury and con-siderable damage to property.

– Ensure that the site is suffi-ciently cleared before com-mencing work

– Ensure that the repair loca-tion is orderly and clean!Components and tools thatare lying about or on top ofeach other are potentialcauses of accidents

– If components have beenremoved, observe correctassembly procedures.Reinstall all fixing/fasteningelements and observe theprescribed tighteningtorque for the screws

– Before placing the deviceback into operation, ensurethat all work has been per-formed and completed incompliance with the specifi-cations and instructions inthese Operating Instruc-tions

Troubleshooting

Safety


Conduct in case of malfunction

The complete machine or system maybe unsafe if there is a defect at theflow monitor (e.g. fractured housing).

The following always applies:

1. In case of malfunctions thatpresent an immediate danger topersons or valuables, proceedaccording to the valid emer-gency plans for the system

2. Determine the cause of the mal-function

3. Before repair, ensure that thereis no danger to persons fromescaping media

4. If necessary, allow the pipelineand device to cool down or towarm up before commencingwork

5. Malfunctions must be correctedby qualified personnel

The following troubleshootingguide provides an indication ofwho is qualified to repair thefault .

Troubleshooting

Safety


7.2 Troubleshooting guideFault description Cause Remedy Personnel

The switch contactdoes not switch.

No mediumflowing throughflow monitor

Check that medium isflowing through the pipe-line

Qualifiedpersonnel

Flow is too low orthe switch con-tact is set toohigh

n Adjust the switchcontact to a lowerflow rate

n Use the device atanother measuringrange

n Increase the flowrate

Qualifiedpersonnel

Incorrect reduc-tion fitting or pipediameter is toosmall

n Correct pipe diam-eter

Qualifiedpersonnel

Float is stuck Disassemble and cleanthe device

Qualifiedpersonnel

Switch contact isdefective.

n Remedy the causeof the defect (short-circuit, overload)

n Replace the switchcontact

Qualifiedpersonnel

Switch contact ispermanentlyswitched.

Flow is too highor the switchcontact is set toolow

n Reduce the flown Adjust the switch

contact to a higherflow rate

n Use the device atanother measuringrange

Qualifiedpersonnel

Float is stuck Disassemble and cleanthe device

Qualifiedpersonnel

Troubleshooting

Troubleshooting guide


Fault description Cause Remedy Personnel

Switch contact ispermanentlyswitched.

Switch contact isdefective

n Remedy the causeof the defect (short-circuit, overload)

n Replace the switchcontact

Qualifiedpersonnel

The switch point isnot the same asthe actual flow rate.

Improper scaleinstalled formedia used

Request proper conver-sion table or scale formedia used

Qualifiedpersonnel

Incorrect reduc-tion fitting or pipediameter is toosmall

n Correct pipe diam-eter

Qualifiedpersonnel

Device is dirty Disassemble and cleanthe device

Qualifiedpersonnel

Device is defec-tive

Remove device fromsystem and contact themanufacturer

Qualifiedpersonnel

Troubleshooting

Troubleshooting guide


8 Maintenance8.1 SafetyMaintenance work performed incor-rectly

WARNING!

Risk of injury due to mainte-nance work performed incor-rectly!Maintenance work performedincorrectly can result in severeinjury and considerabledamage to property.

– Ensure that the site is suffi-ciently cleared before com-mencing work.

– Ensure that the repair loca-tion is orderly and clean!Components and tools thatare lying about or on top ofeach other are potentialcauses for accidents.

– If components have beenremoved, observe correctassembly procedure. Rein-stall all fixing/fastening ele-ments and observe the pre-scribed tightening torquefor the screws (see Chapter11.1).

– Before placing the deviceback into operation ensurethat all work has been per-formed and completed incompliance with the specifi-cations and instructions inthese Operating Instruc-tions.

8.2 Maintenance planIntervals for replacement of wearparts

RMU-A type flow monitors require verylittle maintenance due to the smallnumber of moving parts. The intervalsfor the replacement of wear partsdepends significantly on the operatingconditions as well as on the composi-tion of the medium flowing through thedevice. For this reason, no intervalshave been set by the manufacturer.The operator must determine suitableintervals based on the local conditionand circumstances.

Maintenance

Maintenance plan


Interval Maintenance work Personnel

Visual inspection for dirt/soiling Qualified personnel

Visual inspection for free-movement of float Qualified personnel

Visual inspection for leaks from the device Qualified personnel

Check proper functioning of the switch contact Qualified personnel

8.3 Removal from thepipe system

The flow monitor must first be removedfrom the pipe system before per-forming maintenance.

WARNING!

Risk of injury from pressur-ized lines!Severe injury may result if thepipe system is under pressurewhen removing the device.

– Depressurize the systembefore removing the device

WARNING!

Risk of injury from hot orcold surfaces!Pipelines can heat up/cooldown dramatically due to themedia flowing through them.Skin contact with hot or coldsurfaces causes severe skinburn or frostbite.

– Before removing thedevice, ensure that themachine or system and theflow monitor have beencontrolled to a temperaturerange between 0 and 40°C

– Do not touch any part ofthe machine or system thatis either very hot or verycold

– Always wear heat-resistant/cold-resistant protectivework clothing and protec-tive gloves when workingnear hot/cold surfaces

Maintenance

Removal from the pipe system


WARNING!

Risk of injury from media inthe pipe system!If the pipe system contains haz-ardous media, severe injurymay be caused by escapingmedia.

– Before removing thedevice, ensure that thepipe system is empty anddoes not contain mediaresidue

– Always wear personal pro-tective equipment whenremoving the device

WARNING!

Risk of injury from media res-idue in the device!After the pipe system has beenemptied, media residue maystill be present inside thedevice. In the case of haz-ardous media, this could resultin serious injury.

– When removing (de-instal-ling the device from thepipe system), always wearpersonal protective equip-ment.

– All requirements specifiedin the media safety datasheet must be observed inaccomplishing the worktask.

– Residue of hazardousmedia in the device canresult in serious injury.

Maintenance

Removal from the pipe system


Removing the device from the pipesystem


Protective equipment:n As specified in the Safety Data

Sheet of the medium, protectiveequipment must be worn whenhandling hazardous media. Inaddition, the specifications of thesystem operator must be followed.If no protective equipment isspecified, suitable protectivegloves and goggles must be worn.

Tools:n Fixed spanner

1. Loosen the adapter union of thepipeline using a suitablespanner. When doing so, lockthe process connection ordevice body in place with asecond spanner.

2. Secure the device against fallingand repeat Step 1 at the otherprocess connection.

8.4 DisassemblyTo replace wear parts or to clean thedevice, the flow monitor must first bedisassembled.

WARNING!

Risk of injury due to incorrectdisassembly!– The device may still contain

media residue– Wear personal protective

equipment when workingwith hazardous media

– Improper disassembly maycause serious injuries ifhazardous media is stillpresent inside the device

CAUTION!

Risk of injury due to incorrectdisassembly!Incorrect disassembly mayresult in injuries.

– Before disassembling,ensure that the flow mon-itor has cooled down/warmed up to a tempera-ture range between 0 and40 °C

– Wear personal protectiveequipment to protectagainst hazardous mediawhich may still be presentinside the device.

Maintenance

Disassembly





Protective equipment:n Gogglesn Protective gloves

Tools:n Fixed spannern Socket wrench

Special tools:n Threaded ring insertion tool

Fig. 22: Insert threaded ring insertiontool (outlet)

1. Insert the threaded ring insertiontool into the device outlet(Fig. 22) and turn until it rests inthe keyway of the threaded ring

Maintenance

Disassembly


Fig. 23: Loosen threaded ring (outlet)

2. Insert socket wrench into thethreaded ring insertion tool andloosen the threaded ring(Fig. 23). Hold the device bodyin place using a proper sizedspanner wrench.

Fig. 24: Remove threaded ring (outlet)

3. Unscrew the threaded ring(outlet) from the device body(Fig. 24)

Fig. 25: Remove inner parts

4. Carefully turn the device body180° and remove the inner parts(spring, magnets and float).(Fig. 25)

Maintenance

Disassembly


Fig. 26: Spring, magnets and float

5. The inner parts of the flow mon-itor consist of the spring(Fig. 26/1), magnets (Fig. 26/2)and float (Fig. 26/3).

8.5 Maintenance

8.5.1 CleaningIt is the responsibility of the operator toestablish appropriate intervals and pro-cedures for cleaning the individualparts of the device. It must be ensuredthat the parts are not damaged duringthe cleaning process. When using

cleaning agents, it must be ensuredthat these are not aggressive to theparts and that there will be no dan-gerous reactions with media residue.Damaged parts must be replaced.

WARNING!

Risk of injury due toimproper cleaning!The device may still containmedia residue

– To protect against haz-ardous media residue inthe device, wear personalprotective equipment.

– Do not use cleaning agentswhich may lead to dan-gerous reactions withmedia residue.

– All requirements specifiedin the safety data sheetmust be observed whenhandling or otherwise usingthe medium.

– Residue of hazardousmedia inside the devicecan cause serious injury.

Maintenance

Maintenance > Cleaning


CAUTION!

Risk of injury due to dam-aged parts!If parts of the device are brokenor damaged, they may causeinjury due to sharp edges orsplinters during the cleaningprocess.

– Damaged parts must bereplaced

– Carefully clean the parts ofthe device, so as not tocause damage.

– When cleaning, alwayswear appropriate personalprotective equipment.

– Incorrect disassembly canresult in injuries.



8.5.2 Parts replacementDepending on the operating condi-tions, wear parts such as float or mag-nets may have to be replaced. Stepsrequired to replace these parts corre-spond to those used to assemble thedevice Ä Chapter 8.5.3 “Assembly”on page 51.

8.5.3 AssemblyAfter cleaning the individual compo-nents, the flow monitor must be reas-sembled.

Maintenance

Maintenance > Assembly



Tools:n Fixed spannern Socket wrenchn Torque wrench

Special tools:n Threaded ring insertion tooln Test rodn Magnetic pole indicator

Fig. 27: Inner parts

1. Insert spring (Fig. 27/1) withmagnets (Fig. 27/2) into the float(Fig. 27/3), ensuring propermagnetic pole orientation (northpole toward device outlet).

Fig. 28: Insert inner parts

2. Insert float with magnets andspring into the device body(Fig. 28)

Maintenance



Fig. 29: Insert threaded ring (outlet)

3. Insert the threaded ring (outlet)into the device body (outlet)(Fig. 29)

Fig. 30: Seat threaded ring (outlet)

4. Lightly seat the threaded ring(outlet) with the aid of thethreaded ring insertion tool andtighten with a torque wrench(Fig. 30), observing the propertorque ( Ä Chapter 11.1 “Tight-ening torque” on page 62)

Maintenance



Fig. 31: Check for smooth operation

5. Check the float for ease ofmovement (Fig. 31) by applyinglight pressure with the test rod

ð If the float moves sluggishly,then disassemble thedevice Ä Chapter 9.2 “Dis-assembly” on page 56 andclean the float and devicebody bore

If the float is still sluggish afterhaving been cleaned severaltimes, contact the manufac-turer.

8.5.4 Switch contactreplacement

Tools:n Hex screwdriver

Fig. 32: Loosen set screws

1. Loosen the set screws (Fig. 32)of the switch contact using anappropriate sized hex screw-driver until the switch contactcan be removed.

Fig. 33: Remove switch contact

2. Remove the switch contact(Fig. 33) from the device

3. Position the new switch contact

Maintenance

Maintenance > Switch contact replacement


4. Insert and lightly tighten the setscrews so that the switch con-tact can slide easily.

5. Connect a continuity meter: ForNormally Open Contact (NOC),pin 1 and pin 2 are assigned

6. Slide the switch contact in theopposite direction of flow up tothe stop. The switch contactmust now be closed.

7. Slowly push the switch contactin the direction of flow, until thecontact opens. This switch pointshould be set as accurately aspossible because it affects theaccuracy of the switch pointadjustment scale values (ifneeded, repeat steps 6 and 7).

8. Tighten the set screws(Fig. 32/1) observing the propertightening torque ( Ä Chapter11.1 “Tightening torque”on page 62)

9. Affix the enclosed data plate tothe side of the switch contact sothat the reference arrow is inalignment with the lowest scalemark. If a reference tick mark ison the data plate (recognizableas a thinner line), it is to be usedas the alignment mark. Theadhesive surface must be dryand free of oil and grease.

10. Adjust the desired flow rate (cut-off point) on the switch pointadjustment scale, then tightenthe set screws, observing theproper torque ( Ä Chapter 11.1“Tightening torque”on page 62)

8.6 Measures to betaken after mainte-nance work

Take the following steps after comple-tion of maintenance work and beforeswitching on the device:

1. Check all previously loosened/released screw connections fortightness.


2. Clean the work area andremove all residual materials,packaging, substances or spills.

Maintenance

Measures to be taken after maintenance work


9 Disassembly and disposalAfter its period of useful life, the devicemust be disassembled and disposed ofin an environmentally safe manner.

9.1 Safety

WARNING!

Risk of injury if disassembledincorrectly!Media residue, sharp edgedcomponents, pointed ends andcorners on and in the device oron tools may cause injury.

– Ensure that the site is suffi-ciently cleared before com-mencing work

– Always wear protectiveequipment when handlinghazardous media residue

– Handle open, or sharp-edged components care-fully

– Ensure that the workplaceis orderly and clean! Com-ponents and tools that arelying about or on top ofeach other are potentialcauses for accidents

– Disassemble componentsprofessionally

– Secure components so thatthey do not fall or overturn

– If in doubt, contact themanufacturer

9.2 Disassembly

Before starting disassembly:

n Remove operating materials andpackaging and dispose of prop-erly.


Protective equipment:n Protective glovesn Goggles

1. Remove the device from thepipe line ( Ä Chapter 8.3“Removal from the pipe system”on page 45)

2. Disassemble the device( Ä Chapter 9.2 “Disassembly”on page 56)

3. Clean components properly andremove media residue

4. Dispose properly

Disassembly and disposal

Disassembly


9.3 Return Materials9.3.1 Return Materials

AuthorizationFor products being returned, regard-less of the reason, the currently validprovisions of the returns policy set byMEISTER will apply. Return shipmentswhich do not comply with the returnspolicy may be refused by MEISTER atthe expense of the consignor.

9.4 DisposalIf no return or disposal agreement hasbeen made, recycle disassembledcomponents:

n Scrap metalsn Recycle plastic elementsn Dispose of the remaining compo-

nents according to their materialproperties

NOTICE!

Danger to the environmentdue to incorrect disposal!Potential risk to the environ-ment may arise due to incorrectdisposal.

– Have electrical scrap, elec-tronic components, lubri-cants and other suppliesdisposed of by approvedspecialists

– In case of doubt, obtaininformation on environmen-tally safe disposal from thelocal authority or specialdisposal expert

Disassembly and disposal

Disposal


10 Technical data10.1 Device data plateThe data plate is on the mechanicalpart of the flow monitor/flowmeter andcontains the following information:

Device designation

Item number Serial number

DE-63831 Wiesen

www.meister-flow.com

Fig. 34: Device data plate

10.2 Switch contactrating plate

Max: xxx V x A xx VA

Fig. 35: Switch contact rating plate

Abschaltpunkt Switch-off-point

Max: xxx V x A xx VA

Fig. 36: Switch contact rating platewith positioning arrow

The rating plate is on the switch con-tact and may provide the followinginformation:

n maximum voltagen maximum currentn maximum powern positioning arrow for cut-off point

Technical data

Switch contact rating plate


10.3 Dimension sheet

Technical data

Dimension sheet


10.4 General specificationsType Overall dimensions (mm)

G * DN SW L1 L2 T

RMU-A11 1/2 15 27 90 - 14

RMU-A15 1/2 15 27 90 - 14

Type Overall dimensions (mm)

G * D1 D2 A1 A2 A3 A4 Weight(g) **

RMU-A11 1/2 - 31,2 - - - ca.37,5

350

RMU-A15 1/2 - 31,2 - - - ca.37,5

350

* NPT thread on request

**Connecting cable weight, 2m approx. 80g

10.5 Electrical specificationsNormally Open Contact (NOC)

Data Value Unit

Voltage 230 V

Current, maximum 3 A

Power, maximum 60 VA

Technical data

Electrical specifications


10.6 Measuring ranges10.6.1 Standard measuring rangesType Switch range for H2O at 20 °C*

l/min gph gpm

RMU-A11 2,5 – 11,0 40,0 – 175,0

RMU-A15 5,0 – 15,5 80,0 – 245,0

* The specified data are switch-off points (other switch ranges are available onrequest).

10.7 Operating dataDescription Value Unit

Max. media temperature 100 (optional 160°C) °C

Min. media temperature

It must be ensured thatthe medium does notfreeze.

-20 °C

Max. operating pressure 250 bar

Pressure loss 0,025 – 0,25 bar

Measuring accuracy ± 10 % of full scale value

RMU-A devices are not suitable foremployment in explosion-hazardzones.

Technical data

Operating data


11 Appendix11.1 Tightening torqueComponent/function

Description Size Torque Qty

Threaded ring Threaded ring(outlet)

G1/2" 5 Nm 1

Switch contact Cylinder headscrew, hex

M3x10 0,4 Nm 2

11.2 Replacement partsThe following replacement parts drawing provides an example of the constructionof an RMU-A type flow monitor. The actual configuration may vary depending onthe model.

Appendix

Replacement parts


Item Qty Description

1 1 Device body

2 1 Float

3 2 Magnet

4 1 Spring

5 1 Threaded ring (outlet)

6 1 Switch contact with connecting cable

Appendix

Replacement parts


Item Qty Description

7 2 Washer

8 2 Set screw (switch contact)

11.3 ToolsThe following tools are required:

Tools

n Fixed spanner 27 mmn Hex screwdriver 2,5 mmn Torque screwdriver and assorted

bladesn Socket wrench 1/2" and assorted

socketsn Torque wrench 1/2"

Special tools

n Threaded ring insertion tool RMU-A

n Test rod RMU-An Magnetic pole indicator

11.4 Sealant

Before using a sealant, ensurethat it is compatible with themedia used and that it can beemployed under the given oper-ating conditions.

n Ensure proper sealn Use a suitable sealant. Liquid

sealants will damage the flowmonitor

n Always follow the sealant manu-facturer's instructions

Appendix

Sealant


11.5 Lubricants

Before using a lubricant, always make sure that it is compatible with theoperating medium.

For the proper mounting of O-rings, device-specific O-ring installation tools may bepurchased from the manufacturer.

The following lubricants are suitable to facilitate installing the O-rings:

Lubricant O-ring material

NBR EPDM FKM

Glycerine* suitable suitable suitable

Soapy water suitable suitable suitable

* Glycerine must not be used if the device is used for sulfuric acid and/or nitricacid.

Appendix

Lubricants


12 IndexAAssembly . . . . . . . . . . . . . . . . . . 51

CCable . . . . . . . . . . . . . . . . . . . . . 35Component groups . . . . . . . . . . . 21Connected loads

Normally Open Contact (NOC) 60

Contact . . . . . . . . . . . . . . . . . . . . 7Contact protection measures . . . . 35Copyright . . . . . . . . . . . . . . . . . . . 3Correct use . . . . . . . . . . . . . . . . . 10Customer service . . . . . . . . . . . . . 7

DDegree of protection

IP-Code . . . . . . . . . . . . . . . . 35

Device data plate . . . . . . . . . . . . . 58Device description . . . . . . . . . . . . 20Dimension sheet . . . . . . . . . . . . . 59Disassembly

disposal . . . . . . . . . . . . . . . . 56

Maintenance . . . . . . . . . . . . . 47

Disposal . . . . . . . . . . . . . . . . . . . 57

EElectrical connection . . . . . . . . . . 34employment . . . . . . . . . . . . . . . . 10Environmental protection . . . . . . . 17

cleaning fluids . . . . . . . . . . . . 17

lubricants . . . . . . . . . . . . . . . 17

FFault table . . . . . . . . . . . . . . . . . 42flow value . . . . . . . . . . . . . . . . . . 39

GGeneral

safety . . . . . . . . . . . . . . . . . . . 8

HHazard

electrical current . . . . . . . . . . . 11

Hazardsmechanical . . . . . . . . . . . . . . 12

media . . . . . . . . . . . . . . . . . . 14

radiation . . . . . . . . . . . . . . . . 13

temperature . . . . . . . . . . . . . . 13

IInitial startup . . . . . . . . . . . . . . . . 32Installation

pipe line . . . . . . . . . . . . . . . . 29

preparatory work . . . . . . . . . . 26

LLimitation of liability . . . . . . . . . . . . 3Lubricant . . . . . . . . . . . . . . . . . . 65

MMaintenance . . . . . . . . . . . . . . . . 50Maintenance plan . . . . . . . . . . . . 45Measuring range . . . . . . . . . . . . . 61

Index


OOperating conditions . . . . . . . . . . 61Overview . . . . . . . . . . . . . . . . . . 20Owner . . . . . . . . . . . . . . . . . . . . 17

PPackaging . . . . . . . . . . . . . . . . . 22Parts replacement . . . . . . . . . . . . 51Plug connection . . . . . . . . . . . . . 35Precautions

general . . . . . . . . . . . . . . . . . 10

Preparationdevice . . . . . . . . . . . . . . . . . . 29

RRead-off . . . . . . . . . . . . . . . . . . . 39Replacement parts . . . . . . . . . 16, 62Return Materials Authorization . . . 57

SSafety

disassembly . . . . . . . . . . . . . . 56

Safety equipment . . . . . . . . . . 15, 16Safety instructions

transport . . . . . . . . . . . . . . . . 22

Sealant . . . . . . . . . . . . . . . . . . . 64

Service . . . . . . . . . . . . . . . . . . . . 7Special tools . . . . . . . . . . . . . . . . 64Storage . . . . . . . . . . . . . . . . . . . 23Strainer . . . . . . . . . . . . . . . . . . . 28Switch contact . . . . . . . . . . . . . . . 21

replacement . . . . . . . . . . . . . . 54

Switch contact rating plate . . . . . . 58Switch point . . . . . . . . . . . . . . . . 37Switch point adjustment scale . . . . 21Symbols

packaging . . . . . . . . . . . . . . . 23

Symbols usedin the instructions . . . . . . . . . . . 8

TTechnical data

general specifications . . . . . . . 60

Tightening torque of screws . . . . . 62Tools . . . . . . . . . . . . . . . . . . . . . 64Transport inspection . . . . . . . . . . 22

UUnimpeded flow section . . . . . . . . 27

WWarranty and guarantee provisions 7

Index


Date post:	13-Apr-2022
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RMU-A Module BASICS Flow Monitor

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