Description

The Bently Nevada 79492-01 is a 3300/35 Six-Channel RTD Temperature Monitor designed for continuous temperature monitoring in Bently Nevada 3300 systems.

The monitor provides six independent temperature channels and accepts up to six resistance temperature detector inputs. The identified 79492-01 configuration uses 3-wire 100 ohm platinum RTDs with an alpha coefficient of 0.00392.

This configuration has a full-scale measurement range of 0 to 300 degF. Each channel provides independent temperature indication and alarm processing for machinery monitoring applications.

The front panel includes a four-digit LCD for measured temperature, channel status, alarms, bypass status, and diagnostic information. Individual recorder outputs are available for all six channels.

Features

• Six independent temperature monitoring channels

• Designed for Bently Nevada 3300 machinery monitoring systems

• 3300/35 RTD input configuration

• Six RTD input capability

• 3-wire 100 ohm platinum RTD input

• Platinum alpha coefficient of 0.00392

• 0 to 300 degF configured full-scale range

• Two independently configurable alarm levels per channel

• Front-panel LCD temperature and status indication

• Individual recorder output for each channel

• Epoxy-sealed alarm relay configuration

• Front-panel controls for channel and alarm information

Applications

• Bearing temperature monitoring

• Machinery temperature protection

• Motor and generator temperature monitoring

• Rotating equipment condition monitoring

• Multi-point RTD temperature measurement

• Replacement of existing 79492-01 temperature monitor assemblies in 3300 systems

Ordering Information

Technical Specifications

General

RTD Input

Signal Conditioning

Recorder Outputs

Alarm Functions

Display and Controls

Environmental

Installation Guidelines

1. Confirm the part number 79492-01 before replacing an installed monitor.

2. Verify the existing system uses the 3300/35 RTD temperature-monitor architecture.

3. Confirm the required RTD type and configured full-scale range.

4. Record existing alarm, recorder-output, and bypass settings before removal.

5. Isolate applicable system circuits before disconnecting the installed monitor.

6. Confirm the RTD field wiring before reconnecting all six channels.

7. Install the monitor in the correct 3300 rack positions.

8. Check monitor calibration after installing a spare unit.

9. Verify all six temperature channels before returning the system to normal operation.

Configuration Guidelines

The 79492-01 configuration uses 3-wire 100 ohm platinum RTDs with an alpha coefficient of 0.00392.

Recorder outputs can be configured for +4 to +20 mA, +1 to +5 Vdc, or 0 to -10 Vdc according to system requirements.

Alarm 1 operates as an over-temperature alarm. Alarm 2 can be configured for either over-temperature or under-temperature operation.

Alarm reset behavior, time delay, First Out functions, recorder behavior during NOT OK conditions, and display resolution are field-programmable options.

Commissioning Recommendations

Verify each RTD channel independently after installation.

Compare displayed temperatures with expected machine conditions before enabling alarm actions.

Check Alarm 1 and Alarm 2 setpoints for every active channel.

Verify individual recorder outputs if the monitor is connected to external recording or control equipment.

A replacement monitor should be checked and recalibrated as necessary before normal service.

Replacement Recommendations

The 79492-01 should be matched to the existing 3300/35 monitor configuration rather than selected only by the Six-Channel Temperature Monitor description.

Verify the RTD type, measurement range, relay configuration, agency option, and safety-barrier configuration before replacement.

Record field-programmable settings before removing the existing unit. This reduces commissioning work and helps preserve the original machinery protection strategy.