Bently Nevada 3500/42M 135489-01 Internal-Barrier Prox/Accel I/O Module
An internal-termination rear I/O module with intrinsic barriers for four Proximitor or accelerometer channels.
Product Profile
3500/42M 135489-01 is the internal-barrier rear I/O option for a 3500/42M monitor using Proximitor or accelerometer signal paths on every channel. The exact suffix is important because adjacent I/O variants assign different sensor types.
The module forms part of a complete measurement loop that includes the front monitor, field transducer, cable and configured measurement function.
Technical Data
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Complete Identification | 3500/42M 135489-01 |
| Product Family | 3500/42M Proximitor Seismic Monitor |
| Module Position | Rear-slot I/O module |
| Termination Style | Internal termination |
| Barrier Construction | Internal intrinsic-safety barriers |
| Channel Arrangement | Four Prox/Accel inputs |
| Channel Assignment | Proximitor or accelerometer on channels 1 through 4 |
| Matched Front Module | 3500/42M Proximitor Seismic Monitor |
System Role
- Barrier-protected signal paths for the documented Prox/Accel arrangement.
- Consistent input family across all four rear-module channels.
- Direct rack-side field termination behind the associated monitor.
- Support for measurement functions selected in the front module configuration.
Compatibility
- Use with the corresponding 3500/42M front monitor and compatible Proximitor or accelerometer loops.
- Do not exchange with the all-Velomitor 135489-03 module on the basis of connector appearance.
- Maintain hazardous-area approvals, cable parameters and grounding practice.
Applications
- Hazardous-area displacement or acceleration monitoring with an approved intrinsic-safety loop.
- Existing 3500/42M racks that retain four Prox/Accel channels.
- Maintenance where internal rack terminations and channel assignments must remain unchanged.
FAQ
How does 3500/42M 135489-01 differ from 135489-03?
This module is arranged for Prox/Accel inputs, while 135489-03 is arranged for Velomitor inputs.
Can 3500/42M 135489-01 be used with an external termination block?
No. The module is designed for internal terminations behind the rack.
Does 3500/42M 135489-01 alone determine the measurement function?
No. The front monitor configuration, sensor chain and rear I/O together define the working channel.
What should be reviewed before ordering 3500/42M 135489-01?
Confirm the front monitor, four sensor loops, rack slot, barrier approvals and field wiring.
Can a Velomitor loop be moved onto 3500/42M 135489-01 without review?
No. Sensor compatibility and the I/O assignment must be engineered for the selected module.
Which commissioning checks apply to 3500/42M 135489-01?
Verify transducer bias or baseline, signal scaling, alarms, channel status and system communications.
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