@TecQuipment Ltd 1999No part of this publication may be reproduced or transmitted inany form or by any means, electronic or mechanical, includingphotocopy, recording or any information storage and retrievalsystem without the express permission of TecQuipment Limited.

All due care has been taken to ensure that the contents of thismanual are accurate and up to date. However, if any errors arediscovered please inform TecQuipment so the problem may berectified.

A Packing Contents List is supplied with the equipment.Carefully check the contents of the package(s) against the list. Ifany items are missing or damaged, contact your localTecQuipment agent or TecQuipment Ltd immediately.

EducationalPRODUCTS

KEEP FOR FUTURE REFERENCE

Safety and Operation Information

PRODUcr: H1D VOLUMETRIC HYDRAULIC BENCH

In compliance with the EC directive on Safety of Machinery. the followinginformation should be noted:

This equipment is only to be used in accordance with instructions in themanual. Students using the equipment must be adequately supervised. Localhealth and safety regulations must be observed in using this apparatus.

Foreseen use of machineService bench for use with hydraUlics experimenb.

Risks due to incorrect useElectrical fire, electric shock.

Installation and assembly instructionsThe HId is a floor standing self contained item. It is usually despatched in itsassembled condition with the exception of the drain valve:1. Remove the bench top and lift it off onto a suitable support. Do not stand

or drop the .top on its edge.2. Remove and discard the straps securing the weigh tank ~o the weigh beam

and the weigh beam to the sump tank.3. Place the drain valve into the hole in the weigh tank (sealed end of valve

column down).

Always isolate this equipment from the electrical supply before accessingany of its electrical components.

Electrical connections should be made as follows:

WARNING' "

THIS APPARATUS MUST BE EAl'{ffifi'[j/

IMPORTANTThe wires in the mains lead supplied with the equipment are coloUr~d~inaccordance with the following code:

GREEN-AND-YELLOW: EARTH (E or~)BROWN: LIVE (L)BLUE: NEUTRAL (N)

The mains lead supplied with this apparatus has bare ends for connection tothe supply. To fit a plug follow the instructions suppijed with it whilstobserving the colour code above.

Warning: Safety regulations state that equipment of this type should not beoperated within 3 metres of the electrical outlet. It is strongly recommendedthat the installation be protected by a residual current circuit breaker with atrip current of 30 mA, and that the supply is fused at a rating of either 5 A(230 V supply) or 10 A {115 V supply).

The HID is a floor standing self contained item. It is usually despatched in itsassembled condition with the exception of the water level indicator.

a) Remove and discard the straps securing the bench top to the sump tank.b) Remove the bench top and lift it off onto a suitable support. Do not stand

or drop the top on its edge.c) Place the drain valve in the outlet hole in the base of the volumetric tank.

(sealed end of valve column down). The holes in the column just above thevalve collar should now be clearly visible.

Checking and draining operations ' -"'

With the bench top removed, el1Sure that the sumpt~ is clean and free., .

from dust.

a),Fil~ the sump tank with co)d water to a depth of 380 mIn.b)c Mix the stain! deposi t preventer in the correct propor~on to the contents of

the sump tank.c) Close the bench supply valve.d) Connect the bench to the mains and start the pump motor. Check the hose

clips for leaks and tighten if necessary.e) Insert the long tubular drain valve column through the hole in the base of

the volumetric tal1k so that the rigid collar rests on the hole seal. The sealed. end of the column ~hoUld now be downwards within the s~p tanko~ the

bench, and the large diameter holes drilled through the col~ just abovethe valve collar should be clearly visible.

f) Open the bench supply valve and fill the volumetric tank with water toapproximately 50 mIn from the top of the overflow outlets. The weight ofwater will ensure complete water tightness of the drain valve seating.

g) Close the bench supply valve and check that the drain valve is closed andnot leaking.

h) To drain the volumetric tank, simply lift the drain val~e".allowingwater toreturn to the sump tank.

Additional sump outlet "',

The procedure for CO11l1ection of the additional sump outlet pipe is as follows:

a) Slacken the two retaining clips on the water level scale, remove the plasticpipe from the top grommet and detach it from the groove in the scale. Pushthe pipe back through the bottom grommet and lift the bench top clear.

b) A stack pipe from the outlet is located adjacent to the normal delivery pipe.It is secured with a plastic clip and a worm-drive hose clip.

c) The outlet can be connected with the sump tank full of water if theconnection can be made above the level of the sump tank water. Removethe worm-drive clip and slide the pipe through the hole in the tank and outof the plastic clip. The stack pipe can now be connected to the externalcircuit.

d) Replace the bench top.The replacement of the stack pipe is the reverse of the above procedure.

Maintenance and inspectionPeriodically inspect electrical leads and connections for wear. Periodicallycheck that all warning labels are in position and legible.

The sump tank should be drained, wiped clean, and refilled with water andstain/deposit preventive 3 or 4 times per year. To remove heaviercontamination, use a proprietary household cleaner. Always ensure that thereis sufficient water in the sump tank and that the pump is not running dry.

If the pump output seems low:a) Check the bench supply valve for blockages (remove bench top and plastic

supply pipe to view valve).b) Check the pump inlet filter for blockages (remove bench top, drain sump,

disconnect electrical wiring switch and pump hoses, and lift the pump freeof its location bracket to inspect filter).

For optimum safety, this apparatus should be tested annually using suitabletest equipment such as a Portable Appliance Tester (PAT). The exact testmethod will depend upon the model of PAT used; follow the instructionssupplied with the tester. The test parameters are given in the following table:

If the unit appears to function incorrectly t refer to manufacturer or agent foradvice.

Handling instructionsNet weight when dry: 65 kgNet weight when filled with water: 225 kgThe HID should be moved on its castors. Care must be taken if moving whenfilled with water. To avoid possible injury. remove the weight hanger fromthe weigh beam when moving the apparatus.

Operating Conditions

I PRODUCT

, Saf~ uperatin~ t~ml:>~ratu~~ ran~~

r~lativt' humidity rangt'I Saft:' l]

~~)r?~O"V er-v:-o~~~Su I volta{~ (nl)nUfiaJ

, Current (l1!.aximum)~ Froouency

~

Ensure that the voltage on the serial number label attached to the equipmentis the same as the supply voltage.

. - _1~ratiJ)IO;;t':"a~:.'~ ~"V:-:')"'~e.~~

Noise LevelThe measured sound pressure level of this apparatus is as follows~

I At operatinl! workstation at ear levelI Front of machin~: 1m away at a hei~ht of 1.6mI Back of machine: 1m away at a height of 1.6mI Left hand sid~ of machin~: 1m away at a ht'ieht of 1.6mI Rji!ht hand sid~ of machin~: 1;" aWi\V at a h~ight of 1.6mI LocalisPd i\rei\~ ot t'xc~s noise (i.~. air ~~hausts ~tc.)

Readings taken when machine operating at maximum level.Note:For sound pressure levels above 85 dB(Adefenders are worn.

it is recommended that ear

For sound pressure levels abovE.defenders are worn.

90 dB(A it is a requirement that ear

SparesRefer to Packing Contents List for any consumables to cover the warrantyperiod supplied with the apparatus. Refer to manufacturer or importer forany other spares required.

TECQUIPMENT HID VOLUMETRIC HYDRAULIC BENCH

1.0 INST ALLA nON INSTR:ucnONS

The TecQuipment H1Dvolumetf'lc Hydraulic Bench is usually despatched inits assembled condition~o -

1. Place the drain valve in the outlet hole in the base of the volumetric tank

(sealed end of valve column down). The holes in the column just above the

valve collar should now be clearly visible.

2. Attach the hydraulic bench supply hose to the inlet pipe using the jubilee,

clips supplied. Attach the overflow pipe to the overflow pipe assemblyusing the worm drive (jubilee) clips and hose supplied.

1.1. Electrical Mains Connection

Always isolate this equipment from the electrical supply before accessing

any of its electrical components.

Check that the voltage engraved on the manufacturer's plate is the same as

the mains electrical supply to which the equipment will be connected.

1.2 Checking and Draining Operations

With the bench top removed, ensure that the sump tank is clean and free fromdust.

a) Fill the sump tank with cold water to a depth of 380 mm

b) Mix the stain/ deposit preventer in the correct proportion to the contents of

the sump tank. This solution will prevent impurities depositing in the

manometer tubing and other parts of the hydraulic range of equipment.

The solution is especially desirable in hard water areas.

c) Close the bench supply valve

Check the hosed) Connect the bench to the mains and start the pump motor.

clips for leaks and tighten if necessary.

TECQUIPMENT HID VOLUMETRIC HYDRAUUC BENCH

e) Insert the long tubular drain column through the hole in the base of thevolumetric tanks so that the ridged collar rests on the hole seal as shown inFigure 1. The sealed end of the column should now be downwards withinthe sump tank of the bench, aJ1d the large diameter holes drilled throughthe column just above the valve collar should be clearly visible.

f) Open the bench supply valve and fill the volumetric tank with water to

approximately 50 mm from the top of the overflow outlets. Water will

enter the column through the holes just above the valve collar thus making

the column heavier and ensuring complete water tightness of the drain

valve seating.

g) Close the bench supply valve and check that the drain valve is closed and

not leaking.

h) To drain the volumetric tank, simply lift the drain valve, allowing water to

return to the sump tal1k.

Figure 1. Drain column in swnp tank.

TECQU.IPMENT HiD VOLUMETRIC HYDRAULIC BENCH

2.0 FLOW MEASUREMENT TECHNIQUE

The level indicator, fitted to the side of the sump tank, is graduated in litresallowing for simple conversion to mass flow rate. It is suggested that ongreater flow rates a larger volume is measured for accuracy. Themeasurement technique is simply to record the time taken to 'collect' a givenamount of water. This value is then divided by the time taken in seconds toobtain the volume flow rate in litres/ sec and hence the mass flow rate can bederived.

The level indicator for each bench is individually calibrated to ensure

linearity .

Figure 2. Stack pipe arrangement.

TECQUIPMENT HID VOLUMETRIC HYDRAUUC BENCH

3.0 ADDmONAL SUMP OUTLET

An additional sump outlet is provided, so that the apparatus can be used as asump and measuring circuit to any hydraulic circuit required. The procedurefor connection is as follows:-

a) Slaken the two retainingclipson the water level scale, remove the plastic

pipe from the top grommet and detach it from the groove in the scale.

b) Push the pipe back through the bottom grommet, lift and remmove the

bench top.

c) A stack pipe from the outlet is located adjacent to the normal delivery pipe.

It is secured with a plastic clip and worm drive hose clip.

d) Remove the worm drive clip and slide the pipe through the hole in thetank and out of the plastic clip. The stack pipe can now be connected to theexternal circuit.

Note: The outlet can be connected with the sump tank full of water if theconnection can be made above the level of the sump tank water.

e) Replace the bench top

The replacement of the stack pipe is the reverse of the above procedure

TECQUJPMENT HlD VOLUMETRIC HYDRAUUC BENCH

4.0 ROUTINE CARE AND MAINTENANCE

4.1 General

1. The sump tank should be drained, wiped clean with a damp lint-free clothand refilled with clean water at least once a term.

2. Stain/ deposit preventer should be added to the water in the sump tank inthe prescribed proportions to prevent scaling.

3. Where heavy contamination has taken place on the tanks a proprietaryhousehold cleanser may be used if applied sparingly. (It is advisable to trythe chosen cleanser on a small area before applying all over).

4.2 Specific Faults

PUMP OVERHEATS: Check that there is sufficient water in the sump tank

and that the pump is not running dry.

PUMP OUTPUT LOW: Check the following points:-

This is usually noticed by

Refill the tank if necessary.

1. The water level in the sump tank is adequate.

excessi ve noise coming from the pump section.

Blockage of the bench supply valve. Remove the bench top and the flexible

plastic sup}.')ly pipe at the valve and visually check for blockages.

3. Foreign matter in the pump and suction pipe. To dismantle the pump:

(a) Remove the bench top

(b) Drain the sump tank

(c) Disconnect the hose connections on the pump

(d) Disconnect the electrical wiring switch

(e) Lift the pump free of the location bracket

(f) Remove the bottom inlet filter and check for any foreign matter.

TECQUIPMENT HID VOLUMETRIC HYDRAUUC BENCH

BENCH SUPPLY VALVE LEAK: The bench supply valve is a commercialgate valve, the internal details of which are shown in Figure 3. Slight glandleakage can be rectified as follows:-

1 Remove the handwheel retaining nut (A) and the handwheel (B).

2. Slacken and remove nut (C). The gland packing ferrule (0) will now beexposed. The head of the ferrule should be about 2 mm clear of thethread.If this is not the case the leak may be rectified by refitting andtightening nut (C). However, if the ferrule is flush with the thread, thenthe gland requires re-packing. To do this:-

a) Remove the existing packing and re-pack with either replacement nylon '0'rings or asbestos cord.

b) Refit the gland ferrule and nut, el'\Suring that the gland ferrule has

sufficient clearance to tighten the packing when the nut is re-fitted.

B

Figure 3. Internal workings of gate valve