Bently Nevada 3500/77M 140734-07 Legacy Cylinder Pressure Monitor
A four-channel reciprocating-compressor cylinder-pressure monitor identified by the legacy monitor spare number.
Product Profile
3500/77M 140734-07 is the legacy monitor identifier for the 3500/77M reciprocating-cylinder pressure application. It accepts one to four approved positive-voltage pressure-transducer inputs and calculates pressure-related proportional values for protection and operations.
The monitor occupies one full-height front rack slot and works with a separately selected internal- or external-termination I/O module.
Technical Data
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Complete Identification | 3500/77M 140734-07 |
| Product Family | 3500/77M |
| Module Type | Reciprocating cylinder-pressure monitor |
| Channel Capacity | One to four channels |
| Signal Source | Approved positive-voltage pressure transducers |
| Frequency Response | 0 to 5.5 kHz |
| Pressure Accuracy at 25 °C | Within ±0.5% of transducer full range |
| Input Impedance | 50 kΩ |
| Power Consumption | 7.8 W at full transducer-supply load |
| Buffered Output Impedance | 550 Ω |
System Role
- Measures suction, discharge, maximum and minimum cylinder pressures.
- Calculates compression ratio for an individual chamber.
- Supports paired-channel rod-load variables when configured with the required compressor data.
- Compares programmed variables with Alert and selected Danger thresholds.
Compatibility
- Pair with the correct cylinder-pressure rear I/O and approved transducer chain.
- External termination requires terminal blocks 125808-10 or 128015-10 plus the appropriate cable.
- Do not select solely from the 3500/77M family name; preserve the full identifier and rack revision.
Applications
- Cylinder-pressure protection on reciprocating compressors.
- Performance review using chamber-pressure proportional values.
- Maintenance replacement in racks retaining the legacy 140734-07 identity.
FAQ
What is the key difference between 3500/77M 140734-07 and the rear I/O modules?
3500/77M 140734-07 is the front monitor; 143729-01 and 143737-01 are rear I/O choices.
Which variables can 3500/77M 140734-07 calculate?
Configured channels support chamber pressure values and can contribute to compression ratio and rod-load variables.
What is the current listed monitor spare related to 3500/77M 140734-07?
The current datasheet lists 176449-07 as the 3500/77M cylinder-pressure monitor spare.
Can 3500/77M 140734-07 work without a rear I/O module?
No. The complete channel requires the matched rear I/O, transducer and rack configuration.
What must be retained before exchanging 3500/77M 140734-07?
Save channel ranges, compressor geometry, alarm logic, delays, relay mapping and system communications.
How should 3500/77M 140734-07 be validated after service?
Check transducer supply, zero and span, every calculated variable, alarms, relays and rack status.
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