128240-01 | 3500/42M | Bently Nevada Seismic Monitor Module

Product Description

The 3500/42M (Part Number: 128240-01) is a high-performance, four-channel (traditionally referred to as a dual-monitor in legacy terms, but capable of processing four signals in the M-series) Proximitor Seismic Monitor. This module is the cornerstone of the Bently Nevada 3500 Machinery Protection System, designed to provide continuous, online monitoring for critical rotating machinery. It solves the complex challenge of acquiring and processing high-speed vibration data to detect early signs of shaft instability, mechanical looseness, or bearing degradation.

By integrating the 3500/42M (128240-01) into your rack, you gain the ability to monitor radial vibration, thrust position, eccentricity, and seismic acceleration or velocity. The 3500/42M (Model: 3500/42M) independently compares each input signal against user-programmable alarm setpoints, driving local relay logic and providing proportional 4–20 mA outputs for DCS integration. This ensures that assets like turbines, compressors, and large motors are protected with sub-millisecond trip response times during hazardous vibration events.

Detailed Technical Specifications

The 3500/42M (128240-01) is engineered for maximum reliability and precision:

• Manufacturer: Bently Nevada (Baker Hughes)

• Model Designation: 3500/42M (3500/42M)

• Main Module Part Number: 128240-01 (128240-01)

• I/O Module Part Number: 138700-01 (138700-01) (Shaft Absolute I/O)

• Input Channels: 4 independent channels (2 pairs)

• Supported Transducers: Proximity Probes (3300 XL), Accelerometers, Velocity Sensors

• Signal Range: -24 Vdc to +24 Vdc (Buffered outputs)

• Accuracy: ±1% of full-scale range

• Frequency Response: 0.5 Hz to 30 kHz (Application dependent)

• Analog Outputs: 4–20 mA DC proportional outputs

• Alarm Logic: Alert and Danger setpoints for each channel

• Communication: Internal CEX-bus interface for 3500 rack management

• Operating Temperature: 0°C to +65°C

• Storage Temperature: -40°C to +85°C

• Dimensions: 24.1 mm x 244 mm x 103.1 mm (Standard 3500 Slot)

• Weight: 0.35 kg