Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/42-01-00 |
| Base Model | 3500/42M |
| Brand | Bently Nevada |
| Product Type | 4-Channel Proximitor/Seismic Monitor Module |
| Origin | Not specified in supplied data |
| Number of Channels | 4 |
| Compatible Transducers | Proximity transducers, Velomitor sensors, seismoprobes, accelerometers |
| Input Impedance | 10 kOhm typical |
| Recorder Outputs | Proportional to monitor full-scale; +4 to +20 mA or voltage output across load |
| Buffered Transducer Outputs | Front-panel coaxial connectors for raw, unfiltered vibration signals |
| Proximity Probe Scaling | 3.94 mV/um (100 mV/mil) or 7.87 mV/um (200 mV/mil), typical |
| Alarm Setpoints | Programmable Alert and Danger setpoints |
| Alarm Time Delays | Programmable through configuration software |
| Power Consumption | 3.2 W typical |
| Operating Temp | 0 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Humidity | Up to 95%, non-condensing |
| Dimensions | 241.3 mm x 24.4 mm x 241.8 mm |
| Weight | 0.91 kg |
| System | Bently Nevada 3500 Machinery Protection System |
Eddy-Current Signal Scaling and Rotor Dynamics
The 3500/42M processes proximity and seismic transducer signals for machinery vibration and position measurements. The configuration software assigns measurement functions to channel pairs, including radial vibration, thrust position, differential expansion, eccentricity, acceleration, velocity, shaft absolute, and REBAM measurements.
For eddy-current proximity measurements, the module uses the configured probe scaling to convert the electrical input into the corresponding vibration or position value. Therefore, probe type, signal scaling, and measurement configuration must match the installed transducer system.
The buffered outputs provide access to raw transducer signals for external analysis. This arrangement allows technicians to verify the physical signal independently from the processed measurement value.
Frequently Asked Questions
Q: How many measurement channels does the 3500/42-01-00 provide?
A: The module provides four input channels. Channel pairs can be configured for different vibration, position, and seismic measurement functions.
Q: Can the module accept both proximity and seismic transducers?
A: Yes. The supplied specifications identify compatibility with proximity transducers, Velomitor sensors, seismoprobes, and accelerometers.
Q: How are Alert and Danger alarms configured?
A: Alert and Danger setpoints are programmable for active static values. Alarm time delays can also be configured through the 3500 Rack Configuration Software.
Field Installation Guidelines
- Install the module in the designated 3500 rack position and secure it according to the rack installation procedure.
- Verify that the installed I/O configuration matches the connected transducer type before applying operating power.
- Route transducer wiring separately from high-current power conductors where practical to reduce electrical interference.
- Maintain appropriate cable shielding and grounding practices for the installed signal system.
- Verify proximity probe polarity, signal scaling, and electrical connections before placing the monitor into service.
- For proximity measurements, confirm the configured probe scaling against the actual probe and extension cable arrangement.
- Use the front-panel buffered outputs for signal verification when troubleshooting raw vibration signals.
- Confirm Alert and Danger setpoints and alarm delays against the approved machinery protection configuration before commissioning.
- Check rack seating, connector engagement, and module retention before energizing the system.
- Perform a functional verification of each active channel after installation and before placing the machinery protection loop into operational service.
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