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Description
The 3500/77M Recip Cylinder Pressure Monitor is a 4-channel monitor that accepts input from Bently Nevada approved pressure transducers, conditions the signal to make various pressure measurements for reciprocating compressors, and compares the conditioned signals with user-programmable
alarms.

The primary purpose of the 3500/77M monitor is to provide:

Machinery protection by continuously comparing monitored parameters against configured alarm
setpoints to drive alarms.

Essential machine information for operations and maintenance personnel.

Depending on configuration, each channel typically conditions its input signal to provide various parameters called measured variables. Users can configure Alert setpoints for each active measured variable and Danger setpoints for any two of the active measured variables.

Each channel of the 3500/77M will provide eight measured variable values that relate to cylinder pressure operation. The five values that relate to a single chamber are as follows:
Discharge Pressure
Suction Pressure
Maximum Pressure
Minimum Pressure
Compression Ratio

Three measured variables combine one or more channel values with configured mechanical parameters to compute their value:
Peak Rod Compression
Peak Rod Tension
Degree of Rod Reversal

Ordering Information
For the detailed listing of country and product specific approvals, refer to the Approvals Quick
Reference Guide (108M1756) available from Bently.com.
Cylinder Pressure Monitor
3500/77M-AA-BB
A: I/O Module Type
0 3 Cylinder Pressure I/O with Internal Terminations.
0 4 Cylinder Pressure I/O with External Terminations

B: Agency Approval Option
0 0 None
0 1 CSA/NRTL/C
0 2 ATEX/IECEx/CSA

Spares and Accessories
176449-07 3500/77M Cylinder Pressure Monitor.
143729-01 Cylinder Pressure I/O Module with Internal Terminations for Bently Approved Third Party Pressure Transducers
143737-01 Cylinder Pressure I/O Module with External Terminations for Bently Approved Third Party Pressure Transducers

Datasheet link