Bently Nevada 3500/77M 176449-07 Cylinder Pressure Monitor Spare
The listed spare identifier for the four-channel 3500/77M reciprocating-cylinder pressure monitor.
Overview
3500/77M 176449-07 is the current spare identifier listed for the 3500/77M cylinder-pressure monitor. The front module conditions one to four approved pressure-transducer inputs and compares derived cylinder variables with configured alarm setpoints.
A complete replacement plan must also identify whether the rack uses internal or external rear I/O terminations.
Specs
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Complete Identification | 3500/77M 176449-07 |
| Product Family | 3500/77M |
| Module Role | Reciprocating cylinder-pressure monitor |
| Channel Capacity | One to four pressure channels |
| Input Type | Approved positive-voltage pressure transducers |
| Frequency Response | 0 to 5.5 kHz on configured pressure channels |
| Input Impedance | 50 kΩ |
| Power Consumption | 7.8 W with transducer supplies at full load |
| Buffered Output Impedance | 550 Ω |
| Operating Temperature | −30 to +65 °C for internal/external termination I/O |
| Storage Temperature | −40 to +85 °C |
| Humidity | 95% noncondensing |
Features
- Processes cylinder-pressure signals for machinery protection and operating insight.
- Generates multiple proportional values from each configured compressor chamber.
- Supports Alert thresholds for active measured variables and Danger thresholds for selected variables.
- Provides front-panel buffered transducer access for service work.
Applications
- Protection of reciprocating-compressor cylinders using approved pressure transducers.
- Condition review using suction, discharge, maximum and minimum pressure values.
- Rod-load assessment using paired chamber measurements where the configuration supports it.
Lifecycle
- Back up channel ranges, alarm thresholds and compressor geometry data before exchange.
- Identify rear I/O as 143729-01 internal or 143737-01 external termination.
- Confirm transducer supply, pressure range and wiring before energizing the monitor.
- Validate pressure scaling and protective outputs against the approved commissioning procedure.
FAQ
Is 3500/77M 176449-07 the rear I/O module?
No. 3500/77M 176449-07 identifies the front cylinder-pressure monitor spare; the rear I/O is ordered separately.
Which I/O choices pair with 3500/77M 176449-07?
Use 143729-01 for internal termination or 143737-01 for the documented external-termination arrangement.
How many pressure channels does 3500/77M 176449-07 support?
It accepts one to four approved cylinder-pressure transducer inputs.
What configuration must be saved before replacing 3500/77M 176449-07?
Preserve sensor ranges, channel pairing, compressor geometry, proportional values, alarm setpoints and delays.
Can 3500/77M 176449-07 use an arbitrary 4–20 mA transmitter?
No. The monitor is specified for approved positive-voltage pressure transducers and the associated I/O chain.
What commissioning checks are essential for 3500/77M 176449-07?
Verify transducer supply, zero and span, calculated variables, alarm thresholds, relays and rack communication.
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