Bently Nevada 3701/40 177988-01 PAS Input Module
The Proximity, Accelerometer and Seismic input-module spare for an ADAPT 3701/40 monitor.
Overview
3701/40 177988-01 identifies the Proximity, Accelerometer and Seismic input module used with the ADAPT 3701/40 Machinery Dynamics Monitor. It conditions analog sensor signals before conversion and processing by the monitor CPU.
The module selection must follow the configured channel types and connected transducers. A PAS module is not interchangeable with another ADAPT input type simply because the card fits the same terminal base.
Specs
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Combined Reference | 3701/40 177988-01 |
| Spare Part Number | 177988-01 |
| Module Designation | Prox Accel Seismic (PAS) input module |
| Host Platform | ADAPT 3701 monitor family |
| Channel Capacity | Six sensor channels per input module |
| Supported Signal Families | Proximity, acceleration and seismic velocity inputs |
| Keyphasor / Speed Input | One associated input per module |
| Configuration Basis | BNMC project channel map |
| Wiring Verification | Sensors, barriers and terminal assignments |
Features
- Conditions multiple machinery-sensor signal types for the monitor processor.
- Allows a compact monitor to combine shaft-relative and casing-vibration measurements.
- Works with configurable measurements and alarms defined for each channel.
- Supports field replacement while retaining the terminal-base wiring architecture.
Applications
- Radial vibration and thrust-position monitoring.
- Casing acceleration or absolute-vibration measurements.
- Mixed sensor channel sets in compact machinery-protection systems.
Lifecycle
- Export the channel configuration and record every sensor article before removal.
- Identify intrinsic-safety barriers, proximitor systems and grounding arrangements.
- Inspect terminal blocks and field wiring for faults that could affect a replacement module.
- After exchange, verify bias, signal polarity, scaling, alarms and buffered outputs for every channel.
FAQ
Can 3701/40 177988-01 replace a PAV or positive-voltage input module?
Not as an automatic substitution; supported sensor interfaces and configured channel types differ between ADAPT input-module families.
What sensor records are needed for 3701/40 177988-01?
Provide each transducer and interface article, sensitivity, wiring, barrier details, measurement type and configured alarm range.
Does 3701/40 177988-01 determine the monitor alarm logic by itself?
No. The processor applies the measurements, alarms and relay logic stored in the validated BNMC project.
What should be checked before fitting 3701/40 177988-01?
Inspect field wiring, sensor bias, barriers, grounding, terminal assignments and the original failure diagnostics.
Can 3701/40 177988-01 be moved to another slot without project changes?
Keep the documented slot and channel map unless the monitoring project is formally revised and revalidated.
What commissioning tests follow a 3701/40 177988-01 exchange?
Confirm module recognition, channel bias, live signal response, scaling, alarm behavior and each required buffered-output path.
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