Bently Nevada 3500/72M Data sheet
3500/72M Recip Rod Position Monitor
Datasheet
Bently Nevada Machinery Condition Monitoring
Description
The four-channel 3500/72M Recip Rod Position Monitor
accepts input from proximity transducers, conditions the
signal to provide dynamic and static position measurements,
and compares the conditioned signals with userprogrammable alarms.
Each channel, depending on how you configure it, typically
conditions its input signal to generate various parameters
called measured values.
Use the 3500 Rack Configuration Software to:
l Configure alert setpoints for each active measured
value and danger setpoints for any two of the active
measured values.
l Protect reciprocating compressors by continuously
comparing monitored parameters against configured
alarm setpoints to display alarms and trigger relays, if
needed.
l Monitor the condition of essential reciprocating
compressor machinery.
146478 Rev. H
The monitor channels are programmed in pairs and
can perform up to two functions at a time. For
example, channels 1 and 2 can perform one function
while channels 3 and 4 perform another or the same
function.
The 3500/72M Recip Rod Position Monitor meets API 618
requirements for reciprocating compressors. It measures:
l Rod position
l Rod drop
l Hyper-compressor
3500/72M Recip Rod Position Monitor
Datasheet 146478 Rev. H
Data Values
The 3500/72M Recip Rod Position Monitor
Specifications
returns the following data values from
measurements used to monitor the machine:
Inputs
Signal
Input Impedance 10 kΩ
Nominal Scale Factor
Rod Position
Rod Position 2
Rod Drop
Hyper
Compressor
Power
Consumption
Accepts from 1 to 4 proximity
probe signals
0.79 mV/µm (20 mV/mil),
3.94 mV/µm (100 mV/mil) or
7.87 mV/µm (200 mV/mil)
3.94 mV/µm (100 mV/mil) or
7.87 mV/µm (200 mV/mil)
3.94 mV/µm (100 mV/mil) or
7.87 mV/µm (200 mV/mil)
3.94 mV/µm (100 mV/mil) or
7.87 mV/µm (200 mV/mil)
7.7 watts, nominal
Outputs
Front Panel LEDs
Indicates when the Recip Rod
OK LED
TX/RX LED
Bypass LED
Front Buffered Outputs
Buffered
Transducer
Outputs
Output
Impedance
Transducer Power
Supply
Position Monitor is operating
properly.
Indicates when the Recip Rod
Position Monitor is
communicating with other
modules in the 3500 rack.
Indicates when the Recip Rod
Position Monitor is in Bypass
Mode.
The front of each monitor has
one coaxial connector for each
channel.
Each connector is short-circuit
protected.
510 Ω
-24 Vdc
Rod Position
Single Channel
Rod Position
Single 2 Channel
Rod Position Pair
Channel
Rod Position Pair
2 Channel
Rod Drop
Channel
Hyper Channel
Position Magnitude,
Position Angle,
Crank Angle,
Pk-Pk Amplitude,
Gap,
1X Amplitude,
Not 1X Amplitude,
2X Amplitude
Pk-Pk Amplitude
Position Magnitude
Position Angle
Crank Angle
Gap
Average Piston Position
Instantaneous Piston Position
Instantaneous Probe Gap
Position Magnitude,
Position Angle,
Crank Angle,
Pk-Pk Amplitude,
Gap,
1X Amplitude,
Not 1X Amplitude,
2X Amplitude
Pk-Pk Amplitude
Position Magnitude
Position Angle
Crank Angle
Gap
Average Piston Position
Instantaneous Piston Position
Instantaneous Probe Gap
Average Piston Position,
Average Probe Gap,
Instantaneous Piston Position,
Instantaneous Probe Gap
Pk-Pk Displacement,
Gap,
1X Amplitude,
Not 1X Amplitude,
2X Amplitude
2/11
3500/72M Recip Rod Position Monitor
Datasheet 146478 Rev. H
Signal Conditioning
Specified at +25 ºC (+77 ºF) unless
otherwise noted.
Rod Position 2 (Single and Pair) Channels
Frequency Response
Peak-Peak filter Fixed 1 Hz to 600 Hz
Gap filter -3 dB at 0.09 Hz
Average piston
position
Accuracy
Peak-Peak
Amplitude
Position
magnitude
Rod Position
Angle
(paired only)
Position Crank
Angle
Gap
Average piston
position
Instantaneous
piston position
Instantaneous
piston gap
Rod Position Single and Pair Channels
Peak-Peak filter Fixed 1 Hz to 600 Hz
Gap filter -3 dB at 0.09 Hz
Not 1X filter
1X and 2X vector
filter
Fixed 1 Hz to 600 Hz
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±1° typical
±3° maximum
Within ±1° typical
±3° maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Frequency Response
Constant Q Notch filter
Minimum rejection in stop-band
of 34.9 dB over frequency range
of 60 cpm to 15.8 times running
speed
Constant Q Filter
Minimum rejection in stopband
Frequency Response
of 57.7 dB
1X and 2X Vector and Not 1X parameters
are valid for machine speeds of 60 cpm
to 2130 cpm.
Accuracy
Position
magnitude
(direct)
Gap
1X Amplitude
2X Amplitude
Pk-Pk Amplitude
Not 1X Amplitude Within ±3.0% of full scale typical
Position Crank
Angle
Rod Position
Angle
(paired only)
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±1° typical
±3° maximum
Within ±1° typical
±3° maximum
Rod Drop Channels
Frequency Response
Average piston
position (direct)
Average Gap -3 dB at 0.09 Hz
Accuracy
Average piston
position (direct)
Average Gap
Instantaneous
piston position
Instantaneous
probe Gap
Fixed 1 Hz to 600 Hz
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
3/11
3500/72M Recip Rod Position Monitor
Datasheet 146478 Rev. H
Hyper Channels
Frequency Response
Peak-Peak filter Fixed 1 Hz to 600 Hz
Gap filter -3 dB at 0.09 Hz
Constant Q Notch filter
Minimum rejection in stop-band
Not 1X filter
1X Vector filter
2X Vector filter
of 34.9 dB over frequency range
of 60 cpm to 15.8 times running
speed
Constant Q filter
Minimum rejection in stop-band
of 57.7 dB
Constant Q filter
Minimum rejection in stop-band
of 57.7 dB
1X and 2X Vector and Not 1X parameters
are valid for machine speeds of 60 cpm
to 2130 cpm.
Accuracy
Peak-Peak
magnitude
Gap
1X Amplitude
2X Amplitude
Not 1X Amplitude
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
±1% maximum
Within ±0.33% of full-scale
typical
Physical
Monitor Module (Main Board)
Dimensions
(Height x Width x
Depth)
Weight 0.91 kg (2.0 lb)
I/O Modules (non-barrier)
Dimensions
(Height x Width x
Depth)
Weight 0.20 kg (0.44 lb)
241.3 mm x 24.4 mm x 241.8 mm
(9.50 in x 0.96 in x 9.52 in)
241.3 mm x 24.4 mm x 99.1 mm
(9.50 in x 0.96 in x 3.90 in)
Monitor Module (Main Board)
I/O Modules (barrier)
Dimensions
(Height x Width x
Depth)
Weight 0.46 kg (1.01 lb)
241.3 mm x 24.4 mm x 163.1 mm
(9.50 in x 0.96 in x 6.42 in)
Rack Space Requirements
Monitor 1 full-height front slot
I/O Modules 1 full-height rear slot
Environmental Limits
When used with Internal /
External Termination Proximitor /
Seismic I/O Module:
-30°C to +65°C
Operating
Temperature
Storage
Temperature
Humidity
(-22°F to +149°F)
When used with Proximitor /
Seismic Internal Barrier I/O
Module (Internal Termination)
0°C to +65°C
(32°F to +149°F)
-40°C to +85°C
(-40°F to +185°F)
95%
Non-condensing
Alarms
Use Rack Configuration Software
to set alert levels for each value
measured by the monitor and
danger setpoints for any two of
the values measured by the
monitor.
Alarm Setpoints
Accuracy of
alarm setpoints
Alarms are adjustable from 0 to
100% of full-scale for each
measured value. However, when
the full-scale range exceeds the
range of the transducer, the
range of the transducer will limit
the setpoint.
Within 0.13% of the desired value
Alarm Time Delays
You can program alarm delays using 3500
Rack Configuration Software.
Alert
From one to 60 seconds in one
second intervals
4/11
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