Description
Product Introduction & Engineering Value
Temperature is often the first indication that rotating equipment is operating outside its normal condition. Rising bearing temperatures, abnormal stator heating, or elevated process temperatures can develop long before excessive vibration appears. The BENTLY 3500/65 (145988-02) continuously monitors these critical values and initiates alarms when configured limits are exceeded.
Designed for the BENTLY Nevada 3500 platform, the module accepts both RTD and isolated-tip thermocouple inputs. Engineers can configure each channel independently, allowing one monitor to supervise multiple bearing temperatures, motor windings, compressor process temperatures, or other thermal measurements from a single rack.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | BENTLY Nevada |
| Model | 3500/65 |
| Spare Part Number | 145988-02 |
| Product Type | 16-Channel Temperature Monitor |
| Monitoring Channels | 16 |
| Supported Sensors | Isolated-Tip Thermocouples, 3-Wire RTDs, 4-Wire RTDs |
| Measurement Capability | Temperature and Temperature Differential |
| Alarm Functions | User-programmable Alert and Danger Setpoints |
| Configuration Software | 3500 Rack Configuration Software |
| Rack Compatibility | BENTLY Nevada 3500 Machinery Protection System |
| Available I/O Options | Internal or External Termination Modules |
| Typical Applications | Bearing Metal Temperature, Motor Stator Temperature, Process Temperature Monitoring |
Field Application & The “Trench” Experience
A paper mill experienced recurring shutdowns on a turbine-driven boiler feed pump. Vibration remained well within acceptable limits, but bearing metal temperature intermittently increased during high-load operation. Maintenance personnel initially suspected lubrication problems, yet oil analysis showed no abnormalities.
A functional test revealed intermittent signal loss on two RTD channels caused by an aging temperature monitor. After replacing the 3500/65 (145988-02) and verifying all sixteen temperature inputs, operators regained stable bearing temperature measurements and eliminated nuisance alarms during subsequent production runs.
Typical applications include:
- Steam turbine journal and thrust bearing temperature monitoring
- Motor stator winding temperature supervision
- Compressor suction, discharge, and lube oil temperature monitoring
3500/65 145988-02
3500/65 145988-02
Transparency SOP: QA & Testing
Every New Surplus and professionally refurbished 145988-02 module undergoes documented inspection before shipment.
- Verify part number, hardware revision, and ordering configuration.
- Inspect PCB assemblies, connectors, LEDs, and housing condition.
- Install the monitor in a compatible 3500 rack for power-up verification.
- Simulate RTD and thermocouple inputs across multiple channels.
- Confirm alarm operation, communications, and channel accuracy.
- Package the module in anti-static materials with serialized inspection documentation.
The Veteran’s Tech Trap Guide
⚠️ Don’t mix RTD and thermocouple wiring assumptions. Although the monitor supports both sensor technologies, channel configuration must match the installed transducer type. Incorrect configuration can produce inaccurate temperature readings or continuous alarms.
⚠️ Firmware compatibility matters. When installing newer revisions of the 3500/65 I/O modules, Bently Nevada recommends updating the monitor firmware. Failure to do so can result in I/O Module Mismatch and 562 ADC Failure events during startup.
PRO TIP: If using external termination modules, remember that internal-termination I/O modules cannot be used with external termination blocks. Verify the complete hardware configuration before ordering replacement parts.
Dynamic FAQ
Q1. What does the 3500/65 monitor?
The module provides 16 channels of temperature monitoring for RTDs and isolated-tip thermocouples, supporting machinery protection and process monitoring applications.
Q2. Which sensor types are supported?
The 3500/65 accepts isolated-tip thermocouples, 3-wire RTDs, 4-wire RTDs, or a combination of RTD and thermocouple inputs within the same monitor.
Q3. Is 145988-02 the complete monitor?
Yes. 145988-02 is the spare part number for the 3500/65 16-Channel Temperature Monitor. The appropriate rear I/O module must be selected according to the required termination method and application.
Q4. Can the monitor be used in Triple Modular Redundant (TMR) systems?
Yes. In TMR applications, 3500/65 monitors are installed in groups of three adjacent modules to provide redundant temperature monitoring and voting capability.
Q5. How is New Surplus inventory verified?
Every module is inspected for authenticity, hardware revision, connector integrity, PCB condition, and operational performance before shipment. Refurbished units additionally undergo documented functional testing.
Q6. What should be checked before replacing an existing module?
Verify the monitor firmware version, I/O module type, RTD or thermocouple configuration, field wiring, and saved rack configuration before commissioning the replacement module.
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