Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | Bently Nevada 3500/45M |
| Brand | Bently Nevada |
| Product Type | 4-Channel Position Monitor |
| Origin | Not specified in provided data |
| Measurement Channels | 4 channels, programmable in pairs |
| Supported Transducers | Proximity transducers, RPTs, DC LVDTs, AC LVDTs, rotary potentiometers |
| Input Impedance | 10 kOhm for Proximitor or RPT; 1 MOhm for DC LVDT; 137 kOhm for AC LVDT; 200 kOhm for rotary potentiometer |
| Transducer Supply | -24 VDC for Proximitor/RPT; +15 VDC for DC LVDT; 2.3 Vrms at 3400 Hz for AC LVDT; -12.38 VDC for rotary potentiometer |
| Measurement Functions | Axial position, differential expansion, case expansion, valve position |
| Recorder Output | +4 to +20 mA proportional to monitor full-scale |
| Recorder Load | 0 to 600 Ohm |
| Alarm Setpoints | Alert and Danger, independently adjustable from 0 to 100% of full-scale |
| Alert Delay | 1 to 60 seconds |
| Danger Delay | 0.1 seconds or 1 to 60 seconds |
| Dimensions | 241.3 mm x 24.4 mm x 241.8 mm |
| Weight | 0.91 kg |
| Operating Temp | -30 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Humidity | Up to 95%, non-condensing |
| Rack Requirement | One full-height monitor slot and corresponding I/O slot |
| Power Consumption | Not specified in provided data |
Eddy-Current Measurement and Position Signal Handling
The 3500/45M accepts proximity transducer signals for position monitoring and processes the corresponding displacement information according to the configured measurement range. For eddy-current probe installations, technicians should verify probe gap voltage during commissioning before enabling the associated measurement channel.
A typical Bently Nevada proximity probe system uses a negative DC gap voltage, with approximately -10 VDC commonly used as a commissioning target for many probe configurations. The actual target depends on the installed probe system and calibration requirements.
The monitor also supports RPT, DC LVDT, AC LVDT, and rotary potentiometer inputs. Therefore, technicians must select the matching I/O configuration and transducer type before applying field signals. Furthermore, channel pairs require configuration through the 3500 Rack Configuration Software.
Frequently Asked Questions
Q: How many measurement channels does the 3500/45M provide?
A: The module provides four position-monitoring channels. Configuration occurs in channel pairs.
Q: What transducer types can the 3500/45M accept?
A: It accepts proximity transducers, RPTs, DC LVDTs, AC LVDTs, and rotary potentiometers, subject to the installed I/O configuration.
Q: Can the module provide a 4-20 mA output?
A: Yes. The recorder output provides +4 to +20 mA proportional to the configured monitor full-scale, with a specified load range of 0 to 600 Ohm.
Field Installation Guidelines
- Install the monitor in the designated full-height slot of the Bently Nevada 3500 Rack.
- Install the corresponding I/O module in its assigned rack position before connecting field wiring.
- Verify the transducer type and I/O module configuration before applying excitation voltage.
- Route transducer wiring separately from high-current power conductors and switching circuits to reduce electrical interference.
- Maintain appropriate cable shielding practices for low-level position signals.
- Connect cable shields according to the approved 3500 system grounding design and site instrumentation standard.
- For proximity probe applications, verify probe polarity, excitation supply, and gap voltage before placing the channel into service.
- Confirm the configured measurement range before setting Alert and Danger alarm values.
- Verify recorder output scaling against the configured full-scale value during commissioning.
- Check the OK, TX/RX, and Bypass indicators after installation and configuration.
- Do not apply field excitation to a channel until the installed I/O module and transducer wiring have been verified.
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