Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | Bently Nevada 3500/61-01-05 |
| Base Model | 3500/61 |
| Brand | Bently Nevada |
| Product Type | 6-Channel Temperature Monitor |
| System | 3500 Series Machinery Protection System |
| Channel Capacity | 6 channels |
| Input Types | RTD and Thermocouple |
| RTD Types | Platinum 100 ohm, Nickel 120 ohm, Copper 10 ohm |
| Platinum RTD Range | -200 deg C to +850 deg C |
| Nickel RTD Range | -80 deg C to +260 deg C |
| Copper RTD Range | -100 deg C to +260 deg C |
| Thermocouple Types | J, K, T, E, R, S, B, N |
| Type K Range | -18 deg C to +1370 deg C |
| Input Impedance | 10 Mohm per lead input |
| Recorder Outputs | 6 x +4 to +20 mA |
| Recorder Output Load | 0 to 600 ohm |
| Alarm Setpoints | Alert and Danger, individually programmable |
| Setpoint Range | 0% to 100% of full scale |
| Alert Time Delay | 1 to 60 seconds, 1 second increments |
| Danger Time Delay | 1 to 60 seconds, 0.5 second increments |
| RTD Current Source | 925 +/- 15 uA at 25 deg C per transducer |
| Resolution | 1 deg C or 1 deg F |
| Power Consumption | 9 W nominal |
| Module Dimensions | 241.3 mm x 24.4 mm x 241.8 mm |
| Weight | Approximately 0.91 kg |
| Rack Space | 1 full-height 3500 rack slot |
| Operating Temp | 0 deg C to +65 deg C with Internal Barrier I/O |
| Storage Temp | -40 deg C to +85 deg C |
Bently Nevada Temperature Signal and Protection Characteristics
The 3500/61 accepts RTD and Thermocouple signals and processes each channel independently. Therefore, mixed sensor configurations can be assigned across the six available channels when supported by the installed I/O configuration.
The module provides +4 to +20 mA recorder outputs for external recording or monitoring systems. Each output represents the corresponding channel measurement, while the supplied specification states that recorder-output short circuits do not affect the other recorder outputs.
For machinery protection, the monitor compares measured temperature against independently programmable Alert and Danger thresholds. Furthermore, software-programmable time delays prevent short-duration signal excursions from immediately satisfying the configured alarm condition.
The RTD excitation source operates at 925 +/- 15 uA at 25 deg C per transducer. The specified 10 Mohm input impedance limits loading on connected sensor circuits.
Frequently Asked Questions
Q: How many temperature channels does the 3500/61-01-05 provide?
A: The module provides 6 configurable channels for RTD or Thermocouple inputs.
Q: What recorder output does each channel provide?
A: Each channel provides a proportional +4 to +20 mA recorder output with a specified load range of 0 to 600 ohm.
Q: What alarm thresholds can the monitor configure?
A: Each channel supports individually programmable Alert and Danger thresholds from 0% to 100% of full scale, with software-programmable time delays.
Field Installation Guidelines
- Install the module in an approved 3500 rack slot and secure the module according to the rack installation procedure.
- Verify that the installed I/O configuration matches the connected RTD and Thermocouple wiring.
- Route temperature sensor wiring separately from high-voltage power and high-current switching conductors.
- Maintain appropriate cable shielding and terminate shields according to the site grounding architecture.
- Avoid creating ground loops through shield connections at multiple unintended points.
- Verify sensor polarity and terminal assignments before energizing the rack.
- Confirm the configured sensor type and measurement range before placing the channel into service.
- Check the front-panel OK, TX/RX, and Bypass indicators during commissioning.
- Verify recorder-output wiring and connected load before integrating the +4 to +20 mA signals with external equipment.
- For Internal Barrier I/O installations, follow the applicable hazardous-area installation and wiring requirements.
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