Technical Specifications

FAQ

1. What is the main function of the Bently Nevada 3500/61-01-00 163179-02?

The Bently Nevada 3500/61-01-00 163179-02 is a six-channel temperature monitoring module designed for the 3500 Machinery Protection System. It receives temperature signals from RTD and thermocouple sensors, conditions the incoming signals, and continuously compares the measured values with user-programmed alarm setpoints. The module is specifically configured with recorder outputs, providing an individual +4–20 mA output for each temperature channel. This allows temperature information to be transmitted to external monitoring or control equipment while the 3500 system continues to perform its machinery protection functions. Typical applications include monitoring bearing temperatures, motor and generator winding temperatures, turbine casings, compressor components, pump housings and other critical machinery temperature points.

2. How many temperature channels does the 163179-02 support?

The 3500/61 163179-02 supports up to six independent temperature measurement channels. Each channel can receive a compatible RTD or thermocouple signal, allowing several temperature locations to be monitored through a single temperature monitor. Depending on the selected I/O configuration, the system can be configured for RTD inputs, thermocouple inputs, or a combination of both. Each channel should be configured according to the actual sensor connected in the field. Correct channel assignment is particularly important when several temperature points are located close together, because an incorrect channel configuration could cause the displayed temperature to be associated with the wrong physical measurement location.

3. What is the difference between the 3500/61 and the 3500/60 Temperature Monitor?

The 3500/60 and 3500/61 provide the same basic six-channel temperature monitoring functionality, including support for RTD and thermocouple inputs and programmable temperature alarm setpoints. The primary functional difference is that the 3500/61 provides individual recorder outputs for its six temperature channels, while the 3500/60 does not provide these recorder outputs. The 3500/61 is therefore particularly suitable for installations where temperature data must be continuously transmitted to external recording, control or supervisory systems. The +4–20 mA recorder outputs can be connected to DCS, PLC, SCADA or dedicated data acquisition equipment, allowing the temperature information processed by the 3500 system to be used elsewhere in the plant.

4. What types of sensors can be connected to the 163179-02?

The 163179-02 is designed to work with compatible resistance temperature detectors and thermocouples. RTD sensors can be used for applications requiring stable and repeatable temperature measurement, while thermocouples are useful for a broad range of industrial temperature applications. The exact sensor type must be configured correctly in the 3500 Rack Configuration Software. For thermocouples, technicians should also verify the thermocouple type, polarity and appropriate extension or compensation cable. For RTDs, the resistance value, sensor type and wiring arrangement should be checked. Incorrect sensor configuration can produce inaccurate temperature values even if the field sensor itself is functioning correctly.

5. How does the recorder output of the 3500/61 work?

The 3500/61 provides an individual +4–20 mA recorder output for each of its six temperature channels. The analog output represents the configured temperature measurement range and can be connected to external monitoring or control equipment. The output circuit supports a load of up to 600 Ω, with a voltage compliance range of 0 to +12 VDC across the load. During commissioning, the external receiving instrument should be configured to use the same temperature scaling as the 3500/61. If the temperature displayed on the 3500 system is correct but the external DCS, PLC or recorder shows an incorrect value, technicians should check the output wiring, receiver scaling, loop resistance and the corresponding recorder channel before investigating the temperature input itself.

6. What should be checked if one temperature channel shows an incorrect value?

Troubleshooting should begin with the field sensor and wiring associated with the affected channel. For an RTD, check sensor resistance, wiring continuity and terminal connections for open circuits, short circuits or loose connections. For a thermocouple, verify the sensor type, polarity and extension cable. The internal termination connections should also be inspected carefully because a loose terminal can produce unstable or incorrect temperature readings. After checking the field circuit, verify the corresponding channel configuration in the 3500 Rack Configuration Software. The sensor type, measurement range and alarm parameters should match the actual field installation. If the field sensor and configuration are correct but the channel continues to show an abnormal value, the I/O module and temperature monitor should then be tested.

7. What do the OK, TX/RX and Bypass LEDs indicate?

The three front-panel indicators provide basic information about the operating condition of the 3500/61 Temperature Monitor. The OK LED indicates that the temperature monitor is operating normally. The TX/RX LED indicates communication activity between the Temperature Monitor and other modules installed in the 3500 rack. The Bypass LED indicates that the Temperature Monitor is operating in bypass mode. These indicators are useful during commissioning and troubleshooting because they allow technicians to quickly identify whether the monitor is operating correctly, communicating with the rack, or currently bypassed. If an unexpected Bypass indication is present, the condition should be investigated before relying on the associated temperature protection functions.

8. What should be checked after replacing the 163179-02 Temperature Monitor?

After replacing the 163179-02, the complete temperature monitoring system should be inspected and tested before the machinery is returned to normal operation. First verify that the replacement module and associated I/O configuration match the original system. Check all six temperature input channels and confirm that every RTD or thermocouple is connected to the correct channel with the appropriate wiring and polarity. The 3500 Rack Configuration Software should then be checked to confirm that sensor types, measurement ranges, alarm setpoints and channel assignments are correct. After startup, monitor each temperature channel and confirm that the readings are stable and consistent with actual machine conditions. The OK and TX/RX indicators should be checked for normal operation, while the Bypass indicator should remain in the expected state. Finally, verify each +4–20 mA recorder output at the external receiving equipment and confirm that the DCS, PLC, SCADA or recorder displays the correct temperature values.