


The 3500/70M Recip Impulse Velocity / Monitor is a 4-channel monitor that can be used as part of the reciprocating compressor solutions package for
monitoring compressor crankcase and crosshead vibration. The monitor accepts input from seismic transducers, conditions the signal to derive various
vibration measurements, and compares the conditioned signals with userprogrammable alarms. Each channel of the 3500/70M can be programmed using the 3500 Rack Configuration Software to perform one of the following
functions:
• Impulse Acceleration
• Recip Acceleration
• Recip Velocity
The primary purposes of the 3500/70M monitor are to provide:
1. machinery protection by continuously comparing monitored parameters against configured alarm set points to drive alarms, and
2. essential machine information for both operations and maintenance personnel.
Each channel, depending on configuration, typically conditions its input signal into various parameters called “static values”. Users can configure Alert setpoints for each active static value and Danger set points for any two of the active static values.
Category |
Details |
Inputs |
|
Signal Accepts |
From 1 to 4 proximity probe signals |
Input Impedance |
10 kΩ (acceleration input), >1 MΩ (velocity input) |
Special Inhibit |
Contact closure, 5 Vdc @ 390 μA typical |
Power Consumption |
7.7 watts, nominal |
Sensitivity |
|
Impulse Acceleration |
0.51 – 11.72 mV/(m/s²), 5 – 115 mV/g |
Acceleration 2 |
0.51 – 11.72 mV/(m/s²), 5 – 115 mV/g |
Recip Velocity |
3.54 – 22.64 mV/(mm/s), 90 – 575 mV/(in/s) |
Low Frequency Recip Velocity |
3.54 – 22.64 mV/(mm/s), 90 – 575 mV/(in/s) |
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