Overview
Configured for proximity transducer signal conditioning and machinery condition monitoring in the Bently Nevada 3500 Machinery Protection System, the Bently Nevada 3500/40M (3500/40M Proximitor Monitor) provides four independent monitoring channels for vibration and position measurements. Each channel processes proximity probe signals and supports programmable Alert and Danger alarm thresholds through 3500 Rack Configuration Software.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/40M |
| Brand | Bently Nevada |
| Product Type | 4-Channel Proximitor Monitor |
| System | 3500 Machinery Protection System |
| Channel Count | 4 channels |
| Input Type | Bently Nevada proximity transducer signals |
| Measurement Functions | Vibration and position measurements |
| Signal Conditioning | Proximity transducer signal conditioning and scaling |
| Alarm Functions | Alert and Danger thresholds |
| Alarm Configuration | User-programmable |
| Configuration Software | 3500 Rack Configuration Software |
| Channel Configuration | Each channel can be configured for supported monitoring functions |
| Measurement Sensitivity | Selectable according to configured measurement function |
| Output Type | Monitor outputs and status information; exact output configuration depends on system configuration |
| Accuracy | Configuration-dependent; exact accuracy value is not specified in the supplied data |
Eddy-Current Probe Scaling and Gap Voltage
The 3500/40M processes signals from Bently Nevada eddy-current proximity transducers. Therefore, correct probe scaling and gap voltage directly affect the resulting vibration or position measurement.
During commissioning, technicians should verify the probe gap voltage against the applicable transducer system requirements. For Bently Nevada proximity systems, a nominal -10 VDC gap target commonly provides a reference point for probe installation and signal validation. However, technicians should use the applicable probe and Proximitor Sensor documentation for the exact installed configuration.
The monitor applies the configured scaling relationship to the incoming proximity signal. Consequently, incorrect probe type, cable configuration, or scaling parameters can produce incorrect engineering values and alarm behavior.
Frequently Asked Questions (FAQ)
Q: How many measurement channels does the 3500/40M provide?
A: The 3500/40M provides four independent monitoring channels for proximity transducer measurements.
Q: Can the alarm thresholds be configured from the monitor?
A: The Alert and Danger thresholds are user-programmable through the 3500 Rack Configuration Software.
Q: What should technicians verify before commissioning a proximity measurement channel?
A: Technicians should verify the installed probe and cable configuration, signal polarity, probe gap, gap voltage, channel scaling, and configured alarm limits before placing the channel into service.
Field Installation Guidelines
- Install the 3500/40M in the designated 3500 Machinery Protection System rack position according to the rack installation documentation.
- Verify that the connected proximity transducer and extension cable match the configured measurement channel.
- Confirm signal polarity and wiring before energizing the rack.
- Maintain appropriate separation between proximity signal wiring and high-voltage or high-current conductors to reduce electrical interference.
- Terminate cable shields according to the Bently Nevada system wiring specification. Avoid creating unintended ground loops.
- Verify the probe mechanical installation and gap voltage before accepting vibration or position readings.
- Confirm channel scaling against the installed proximity transducer system.
- Configure Alert and Danger thresholds using the approved machinery protection settings.
- Compare measured values with expected shaft vibration or position behavior during commissioning.
- Record the final channel configuration, probe identification, gap condition, scaling parameters, and alarm settings for maintenance reference.
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