Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/72M |
| Brand | Bently Nevada |
| Product Type | Reciprocating Compressor Rod Position Monitor |
| System Compatibility | Bently Nevada 3500 Series Rack System; System 1 software integration |
| Number of Channels | 4 |
| Input Type | Proximity transducer inputs |
| Measurement Functions | Rod Position, Rod Drop, Hyper-Compressor |
| Rod Position Measurements | Peak-to-Peak; Maximum/Minimum position |
| Rod Position Peak-Peak Filter | 1 Hz to 600 Hz |
| Gap Filter | -3 dB at 0.09 Hz |
| Rod Drop / Hyper Channel Measurement | Average piston position |
| Rod Drop / Hyper Channel Filter | 1 Hz to 600 Hz |
| Average Gap Filter | -3 dB at 0.09 Hz |
| Measurement Accuracy | +/- 0.33% of full-scale |
| Alarm Setpoints | Programmable Alert and Danger setpoints per channel |
| Alarm Modes | Latching or non-latching |
| Main Board Dimensions | 241.3 mm x 24.4 mm x 241.8 mm |
| Main Board Dimensions, Imperial | 9.50 in x 0.96 in x 9.52 in |
| Main Module Weight | 0.91 kg |
| Standard I/O Module Weight | 0.20 kg |
Eddy-Current Probe Signal Processing
The 3500/72M processes proximity transducer signals for reciprocating compressor rod monitoring. The input signal contains both position-related and dynamic components, allowing the monitor to calculate rod position, rod drop, or Hyper-Compressor measurements according to channel configuration.
For installation, the transducer scaling and mechanical target relationship should match the configured measurement range. In addition, technicians should verify probe gap voltage during commissioning and confirm that the measured signal remains within the transducer system’s specified operating range. Proper probe alignment also limits mechanical measurement errors caused by target geometry or installation variation.
The 3500/72M applies separate filtering characteristics to rod position and average-gap measurements. Therefore, technicians should retain the configured filter values when validating field measurements and alarm behavior.
Frequently Asked Questions
Q: How many measurement channels does the 3500/72M provide?
A: The 3500/72M provides 4 independent monitoring channels.
Q: Which measurement functions can each channel perform?
A: Each channel can be configured for Rod Position, Rod Drop, or Hyper-Compressor measurements through 3500 Rack Configuration Software.
Q: Does the provided specification define hot-swap limits or power consumption?
A: No. The supplied data does not specify hot-swap restrictions, backplane current loading, or module power consumption. These values should be verified against the applicable 3500 Series system documentation.
Field Installation Guidelines
- Install the monitor in the designated 3500 Series rack position and follow the rack hardware configuration requirements.
- Connect proximity transducer wiring according to the applicable channel and I/O module configuration.
- Keep transducer signal wiring separated from high-current power conductors and switching circuits.
- Use appropriate cable shielding and terminate shields according to the plant instrumentation grounding standard.
- Verify probe mechanical alignment before applying operating conditions.
- Check the transducer gap signal during commissioning and compare the measured value with the applicable probe system requirements.
- Confirm the configured measurement type, scaling, filtering, Alert setpoint, and Danger setpoint before placing the channel into service.
- Verify latching or non-latching alarm behavior against the intended protection logic.
- After commissioning, compare monitor readings with the expected mechanical rod position and compressor operating condition.
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