3500/42M 128240-01 is a Bently Nevada 3500/42M Proximitor/Seismic I/O Module with external terminations. It provides the rear signal interface for the four-channel monitor and its supported proximity or seismic transducer inputs.

Field conductors terminate on separately selected external hardware, with a dedicated interconnect cable linking the termination block to the rack I/O module.

• Provides the external termination interface for four 3500/42M measurement channels.
• Accepts the transducer connections supported by the paired Proximitor/Seismic Monitor.
• Keeps channel wiring aligned with the measurement functions configured in channel pairs.
• Supports remote field termination through separately ordered blocks and cables.
• Maintains a dedicated rear-module relationship with the associated front monitor.

• 3500/42M 128240-01 is intended for the Bently Nevada 3500/42M four-channel Proximitor/Seismic Monitor.
• Seismoprobe is the primary intended transducer; other supported sensor types require measurement-application review.
• The configured measurement function, transducer scale and signal polarity must match the rack configuration.
• Select the correct external termination block and interconnect cable separately.
• Confirm rack slot, monitor revision and field connector arrangement before installation.

• Retain the full 3500/42M 128240-01 part number and its external termination definition.
• Document all four channel assignments, transducer types and measurement functions before removal.
• Inspect the external block, cable and mating connectors as part of the replacement scope.
• Restore the saved rack configuration without changing ranges or alarm setpoints unintentionally.
• Verify channel OK status, measured values and alarm behavior before returning protection to service.