Sentinel DESCRIPTION: The Sentinel is a simple, low cost, and rugged, single channel vibration protection monitor that is capable of operating in remote, unattended, and harsh environments. The Sentinel Vibration Monitor is simple to install and operate. It can trigger built-in solid state relays based on configurable alarm levels. Additionally there is a built-in time delay that prevents false trips, or triggering of the alarm functions from transient increases in vibration level during normal operation. The Sentinel is simple to install, and mounts directly onto the machine skid or bearing housing to measure the vibration. Typical applications include vibration protection monitoring for cooling tower fans, centrifuges, and electric motors. FEATURES: • Options for measuring vibration in two axes or using an external accelerometer. • Measurement in acceleration or velocity. • Solid State Relay to switch AC or DC Loads. • Adjustable, variable filters to reject unwanted signals and pass signals of interest. • Buffered output via standard two-wire internal connection or optional external BNC connector. • Global regulatory compliance approvals (refer to approvals in specifications). • Two adjustable alarm levels. • 4-20mA output proportional to overall vibration level for use with a panel meter, DCS, or other instrumentation. APPLICATIONS: • Centrifuges • Crushers • Cooling Towers • Electric Motors • Pumps • Industrial Fans • Industrial Rotating Machinery Configuration Alarm and Danger setpoints can be set locally using a simple multi-meter. The default settings (see Table 1) for all other parameters may be changed by temporarily connecting a computer, via serial port, and running the included configuration program. Once changed the new default settings are permanently retained in non-volatile memory. Table 1 Default Settings Setting Units Maximum Frequency (Max) Sensitivity Filter Full Scale Value Danger Threshold Danger Delay Time Automatic Danger Reset Time Alarm Threshold Alarm Delay Time Automatic Alarm Reset Time Default Value ips 1 kHz 50 mV/g ISO-2954 (10 Hz to 1 kHz band pass filter) 1.5 ips 0.8 ips 6 seconds 8 seconds 0.65 ips 2 seconds 4 seconds
Transcript
Sentinel
DESCRIPTION:The Sentinel is a simple, low cost, andrugged, single channel vibration protectionmonitor that is capable of operating in remote, unattended, and harshenvironments. The Sentinel VibrationMonitor is simple to install and operate. It can trigger built-in solid state relaysbased on configurable alarm levels.Additionally there is a built-in time delaythat prevents false trips, or triggering of the alarm functions from transient increasesin vibration level during normal operation.
The Sentinel is simple to install, and mountsdirectly onto the machine skid or bearinghousing to measure the vibration. Typicalapplications include vibration protectionmonitoring for cooling tower fans,centrifuges, and electric motors.
FEATURES:• Options for measuring vibration in two
axes or using an external accelerometer.• Measurement in acceleration or velocity.• Solid State Relay to switch AC or DC
Loads.
• Adjustable, variable filters to rejectunwanted signals and pass signals ofinterest.
• Buffered output via standard two-wireinternal connection or optional externalBNC connector.
• Global regulatory compliance approvals(refer to approvals in specifications).
• Two adjustable alarm levels.• 4-20mA output proportional to overall
vibration level for use with a panel meter,DCS, or other instrumentation.
ConfigurationAlarm and Danger setpoints can be setlocally using a simple multi-meter.
The default settings (see Table 1) for allother parameters may be changed bytemporarily connecting a computer, viaserial port, and running the includedconfiguration program. Once changed thenew default settings are permanentlyretained in non-volatile memory.
Table 1 Default Settings
Setting
Units
Maximum Frequency (Max)
Sensitivity
Filter
Full Scale Value
Danger Threshold
Danger Delay Time
Automatic Danger Reset Time
Alarm Threshold
Alarm Delay Time
Automatic Alarm Reset Time
Default Value
ips
1 kHz
50 mV/g
ISO-2954 (10 Hz to 1 kHz band pass filter)
1.5 ips
0.8 ips
6 seconds
8 seconds
0.65 ips
2 seconds
4 seconds
Functional Specification
Power DC 21 – 26.4 VDC, 0.2 A max AC 85 – 240 VAC, 47 – 63 Hz, 0.1 A max
Supported Accelerometers Standard (internal accelerometer)• Sensitivity - factory calibrated at 100 hz traceable to NIST, 50mV/g nominal• Frequency Response: 2 Hz to 1.8kHz (-3dB)• Accuracy: +/- 2% of point (10Hz to 1kHz)External IEPE accelerometer• Configurable, 50mv/g nominal• Power: 2.3 – 3.1 mA from 24 VDC supply
Range Adjustable 0 - 20 gPK0 - 3 ips (or 3000/flow, up to 30ips)0 - 54 mm/s rms (or 54000/flow, up to 540mm/s)
(100 mV/g external accelerometer will reduce range values by 1/2).
Measurement Accuracy +/- 5% of point. Note: Assumes full scale is set to one of the following ranges0.3 g’s pk to 20 g’s pk0.5 ips to 30 ips9 mm/s to 540 mm/sResolution: 0.25% of full scaleNoise Floor: 1% of full scale
Alarm and Danger Relays Normally open contact0.6A or 1 A to 40 degC (104 degF) derated to 0.6A at 70 degC (158 degF)280VAC/400VDC maxCan set to latching, non-latching and/or fail-safe (normally energized)Alarm and danger trip levels adjustable using internal pushbuttons or configuration software.Alarm ON and OFF delays – adjustable 0 – 600 seconds using configuration software
TX Fail Indication Flashing LEDsOptions to trigger relays or output less than 4ma on 4-20ma output
HP Filter Fixed ISO per ISO 2954: 10 Hz – 1000 HzUser Configurable 2- Pole fhigh = 1 to 100 Hz, +/- 0.2 db at fhigh, < - 28 dB at 0.1 * fhigh
LP Filter Fixed ISO per ISO 2954: 10 Hz – 1000 HzUser Configurable 2- Pole flow = 30 to 5000 Hz, +0.2/-0.6 dB at flow, < - 28 dB at 10 * flow
Accelerometer Orientation Parallel or perpendicular to face
4-20mA Output Current vibration reading. Accuracy +/- 2 % OF FULL SCALE500V ISOLATION300ΩMAX LOAD
Buffered Output Buffered transducer signal (0 – 5 V with 2.5 V bias) for use with portable data collector.
Displays Red, Green, & Amber LED’s (internal to enclosure)
Daily Log Records maximum and average daily vibration levels and the temperature at the time of the maximum level. Also records when the device is powered up or reset.
Event Log Records alarm and danger limit events, diagnostic information, and configuration changes.Each Log can retain up to 255 entries.
Mechanical Size 4.80” x 4.72” x3.14” (122 cm x 120 cm x 80 cm) Weight: 2.61Ibs. (1.185 kg.)
Environment Enclosure NEMA 4, IP66-30 degC to 70 degC operating (-22 degF to 158 degF operating)-40 degC to 80 degC storage (-40 degF to 176 degF operating)
Approvals Global regulatory compliance approvals:CE, CSA C/US, C-tickCSA Class l Div 2 Groups A, B, C, DCSA Class ll Div 1 Groups E, F, GContact Rockwell Automation/Entek about pending EEx approval.
MOUNTING DETAILS
Ordering Information
Sentinel 24 VDC, Parallel to face P/N 46638Sentinel 24 VDC, Perpendicular to face P/N 46639Sentinel 120/240 AC, Parallel to face P/N 46640Sentinel 120/240 AC, Perpendicular to face P/N 46641Sentinel 120/240 VAC, External accelerometer only P/N 46642Sentinel Buffered Output BNC Kit P/N 46646
Installing a Sentinel device involves the following tasks:
• Mounting the device onto anappropriate location on the machine
• Wiring the power supply
• Wiring the relays
• Configuring alarm threshold levels
The rugged, all-in-one constructionmakes the Sentinel particularly wellsuited for applications in harshenvironments such as machines in the oil and gas, cement, power orpetrochemical industries.
The single-channel Sentinel is ideal for field applications in which a simplemechanical vibration switch is sufficient,yet machinery protection is required on a continuous basis. The Sentinel can be configured as a standalone unit orintegrated with a control system via itsstandard 4-20mA or buffered outputs.
The Sentinel contains an internalaccelerometer to measure vibration in one of two standard axes, X or Z, asshown in figure 1. The X axis is parallelto the face of the unit and perpendicularto the direction of the mounting holes.The Z axis is perpendicular to the face ofthe unit. The mounted orientation of theSentinel is dictated by the requiredmeasurement axis.
Figure 1 Axis Orientation
“Z-Perpendicular to face”
“X-Parallel to face”
Comprehensive Services
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