Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | Bently Nevada 3500/65 |
| Brand | Bently Nevada |
| Product Type | 16-Channel Temperature Monitor |
| Series | 3500 Series Machinery Protection System |
| Origin | Not specified in supplied data |
| Input Channels | 1 to 16 |
| Input Types | RTD and isolated-tip thermocouple |
| Input Impedance | Greater than 1 Mohm per lead input |
| Power Consumption | 3 W nominal |
| Resolution | 1 deg C or 1 deg F |
| Measurement Accuracy | +/- 3 deg C at 25 deg C |
| Cold Junction Compensation | +/- 2 deg C at 25 deg C for TC measurements |
| Alert Setpoint Range | 0% to 100% of full scale |
| Danger Setpoint Range | 0% to 100% of full scale |
| Setpoint Accuracy | Within 0.13% of desired value |
| Alert Delay | 1 to 60 seconds, 1-second increments |
| Danger Delay | 1 to 60 seconds, 0.5-second increments |
| Operating Temperature | -30 deg C to +65 deg C |
| Storage Temperature | -40 deg C to +85 deg C |
| Main Module Dimensions | 241.3 mm x 24.4 mm x 241.8 mm |
| Main Module Weight | 0.91 kg |
| Main Module Rack Space | 1 full-height front slot |
| I/O Module Dimensions | 241.3 mm x 24.4 mm x 99.1 mm |
| I/O Module Weight | 0.45 kg |
| I/O Module Rack Space | 1 full-height rear slot |
| Front Panel Indicators | OK, TX/RX, Bypass |
| Configuration | 3500 Rack Configuration Software |
| Redundant Configuration | Supports TMR configurations |
| Compliance | Designed for API 670 machinery protection applications |
Temperature Measurement and Machinery Protection
The 3500/65 conditions RTD and isolated-tip TC signals before applying programmed alarm thresholds. Therefore, the module can monitor multiple temperature points within one rack position while maintaining separate channel measurements.
The supported RTD inputs include 100 ohm platinum, 120 ohm nickel, and 10 ohm copper devices. Platinum RTDs support both 3-wire and 4-wire connections. For thermocouples, the module supports Types E, J, K, and T across their specified temperature ranges.
For TC measurements, the module applies cold junction compensation. In addition, its specified compensation accuracy is +/- 2 deg C at 25 deg C.
Rotor Dynamics and Thermal Monitoring
Temperature data complements the mechanical measurements used in machinery protection and rotor dynamics analysis. However, the 3500/65 performs temperature measurement rather than eddy-current probe scaling.
The module therefore should not be treated as an eddy-current displacement monitor. Instead, it converts connected RTD or isolated-tip TC signals into temperature values and compares those values with configured Alert and Danger limits.
Frequently Asked Questions
Q: How many temperature channels can the 3500/65 monitor?
A: The module accepts 1 to 16 RTD or isolated-tip thermocouple input channels.
Q: Which thermocouple types does the 3500/65 support?
A: It supports Type E, Type J, Type K, and Type T thermocouples within their specified measurement ranges.
Q: Can the 3500/65 operate in a TMR configuration?
A: Yes. The supplied specifications identify support for Triple Modular Redundant (TMR) configurations.
Field Installation Guidelines
- Install the monitor and associated I/O module in the specified 3500 Series rack positions.
- Verify the selected RTD or TC wiring configuration before applying power.
- Maintain correct 3-wire or 4-wire RTD connections where applicable.
- Route temperature sensor wiring separately from high-current power and switching circuits to reduce electrical interference.
- Use appropriate shielded instrumentation cable where the installation requires signal noise control.
- Apply the site-approved shield termination and grounding method consistently across temperature measurement circuits.
- Confirm the sensor type and measurement range in the 3500 Rack Configuration Software before placing the channel into service.
- Verify Alert and Danger setpoints against the machinery protection design before enabling the monitoring channel.
- Check the OK, TX/RX, and Bypass indicators during commissioning.
- Confirm that the installed module remains within the specified operating temperature range of -30 deg C to +65 deg C.
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