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Bently Nevada 135137-01 4-Channel External Termination I/O Module

The Bently Nevada 135137-01 resides on the rear bulkhead of the 3500 chassis, serving as a robust, non-isolated 4-channel communication and signal delivery channel. It acts as the physical field partner to front-plane monitoring cards—most notably the 3500/42M Proximitor/Seismic Monitor. The module is capable of processing broad dynamic voltage inputs generated by proximity probes (measuring radial shaft vibration or axial thrust position) as well as seismic case transducers (such as accelerometers and moving-coil velocity sensors).

The defining structural asset of the 135137-01 PWA is its focus on centralized plant deployment architectures. By routing all 4 transducer channels, transducer power paths, and reference grounds through a unified external multi-pin pin connector, this board bypasses the space constraints of standard rack terminal strips. This makes it an ideal fit for complex engineering projects where field instrumentation loops are first gathered in separate marshalling enclosures before being fed cleanly into the central machinery protection system rack.

• Optimized Marshalling Integration: Replaces crowded individual wire terminal blocks with a single multi-pin connector port, making it perfect for clean installation in centralized control room marshalling cabinets.

• High-Fidelity Dynamic Routing: Transfers raw sensor waveforms without filtering or impedance changes, allowing downstream diagnostic computers to receive precise data for orbit and spectrum analysis.

• Short-Circuit Proof Transducer Lines: Includes built-in current limiting circuitry on each channel’s power supply line, protecting the rack's main power supply from field wiring faults.

• Minimized Cabinet Interruption: Defers individual sensor terminal blocks to an external location, enabling field wiring maintenance, loop checks, and changes to occur without disturbing the physical rear of the 3500 rack.

• Robust Mechanical Locking: Equipped with durable retaining screws flanking the multi-pin connector to prevent loose connections caused by low-frequency machine deck vibrations.

• Centralized Turbomachinery Marshalling: Deployed in large-scale power plants and major refineries where hundreds of machinery safety loops are routed through independent terminal cabinets before reaching the control racks.

• Steam Turbine Radial Vibration Tracking: Feeds radial shaft vibration data from multi-bearing turbine setups directly into front-plane 3500/42M cards.

• High-Value Gearbox Diagnostics: Transfers high-frequency acceleration data from complex speed-increaser gearboxes to allow continuous tooth-mesh health checks.

• Balance of Plant (BOP) Fan Networks: Groups vibration and position signals from large industrial boiler fans and cooling tower assemblies into a centralized monitoring framework.

Q1: What is the primary difference between the 135137-01 and the 128229-01 I/O modules?

A: The 135137-01 is explicitly designed for External Terminations, meaning it lacks screw terminals on the card itself and uses a multi-pin connector to link to an external terminal block via a cable. The 128229-01 is an Internal Termination module, featuring built-in Euro-style screw terminals on its own backplate for direct field wire hookups.

Q2: Do I need a separate external terminal block to use the 135137-01 card?

A: Yes. The 135137-01 cannot accept bare field wires directly. It must be paired with an external termination block (such as part number 135137-01 matching blocks or external equivalents) and a specialized Bently Nevada multi-core interface cable to complete the connection loop.

Q3: Does the 135137-01 module include built-in intrinsically safe (I.S.) barriers?

A: No. The 135137-01 is a standard, non-isolated external termination module. If your application sends sensors directly into explosive hazardous environments (Class I, Div 1 / Zone 0), you must route the signals through external DIN-rail safety barriers before landing them on the termination block, or utilize an internal barrier I/O module variant.

Q4: Can this module be hot-swapped while the 3500 system rack is powered up?

A: Yes, the rear I/O module supports live replacement under power. However, unplugging the multi-pin interface cable will instantly disconnect all 4 connected sensor signals from that slot. Before doing this, you must engage the slot bypass in the 3500 Configuration Software to prevent false machinery alarms or accidental system trips.

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