BENTLY 3500/70M

Description

Description
The 3500/70M Recip Impulse Velocity Monitor is a 4-channel
device used as part of the reciprocating compressor
solutions package to monitor compressor crankcase and
crosshead vibration. The monitor accepts input from seismic
transducers, conditions the signal to derive vibration
measurements, and compares the conditioned signals with
user-programmable alarms.
You can program each channel using the 3500 Rack
Configuration Software to perform the following functions:
l Impulse Acceleration
l Acceleration 2
l Recip Velocity
l Low Frequency Recip Velocity
The monitor channels are programmed in pairs and can
perform up to two of the aforementioned 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 primary purpose of the 3500/70M Recip Impulse Velocity
Monitor is to provide the following:
l Machinery protection for reciprocating compressors by
continuously comparing monitored parameters
against configured alarm setpoints to drive alarms
l Essential reciprocating compressor machine
information for both operations and maintenance
personnel
Each channel, depending on configuration, typically
conditions its input signal to generate various parameters
called static values. You can configure alert setpoints for
each active static value and danger setpoints for any two of
the active static values.

Impedance
Protection Each connector is short-circuit
protected.
Recorder Outputs
Recorder
+4 to +20 mA proportional to
monitor full-scale.
Selects one static data value
from each channel to be used for
that channel’s recorder value.
Voltage
compliance +12 Vdc maximum
Load resistance 600 Ω maximum
Resolution 0.3662 µA maximum
Update rate <100 millisecond Accuracy Within ±0.05 mA. ±0.14 mA over temperature range.