Bently Nevada 3500/42 135489-02 I/O Module

Technical Specifications

Parameter	Details
Product Type	Four-Channel I/O Module
Compatibility	Bently Nevada 3500 Series Monitoring System
Number of Channels	4 independent channels
Input Types	Proximity probes (eddy current), magnetic pickups, accelerometers, velocity sensors
Input Signal Range	–0.8 V to –21.0 V DC (proximity), ±10 V DC (accelerometer)
Frequency Response	0 Hz to 10 kHz (DC), 0.2 Hz to 10 kHz (AC)
Measurement Accuracy	±0.1 % of full scale
Resolution	16-bit (0.001 V for voltage inputs)
Sampling Rate	100 samples per second per channel
Alarm Outputs	4 relay outputs (form C, user-configurable)
Communication Protocol	Modbus RTU, Modbus TCP/IP
Dimensions (H x W x D)	241 mm x 38 mm x 254 mm
Weight	1.2 kg
Power Supply	24 VDC nominal (18 VDC to 32 VDC)
Power Consumption	8.5 W typical
Operating Temperature	–20 °C to +65 °C
Storage Temperature	–40 °C to +85 °C
Protection Class	IP20
Certifications	CE, CSA, ATEX, ABS, IEC 61508

Versatile Signal Conditioning

The 3500/42 135489-02 four-channel I/O module provides comprehensive signal conditioning for diverse vibration and position monitoring applications. This unit accepts inputs from eddy current proximity probes, magnetic pickups, accelerometers, and velocity sensors, offering flexibility for various machine types. It delivers high measurement accuracy of ±0.1 % of full scale with 16-bit resolution, ensuring precise data acquisition for critical assets. The module handles both AC and DC signal components, covering a frequency response from 0 Hz to 10 kHz for comprehensive vibration analysis.

High-Speed Data Acquisition

Each channel on the 3500/42 135489-02 samples at 100 readings per second, enabling real-time detection of dynamic machine behavior. The module simultaneously processes displacement, velocity, and acceleration measurements, providing a complete picture of rotor and bearing conditions. Furthermore, the unit includes built-in signal filtering options, allowing users to isolate specific frequency bands for enhanced diagnostic capability.

Alarm and System Connectivity

The 3500/42 135489-02 offers four independent relay outputs, each configurable for alarm, danger, or shutdown functions. Users can define custom setpoints for each channel, tailoring protection strategies to individual machine characteristics. The module communicates seamlessly via Modbus RTU and TCP/IP, integrating with plant DCS, PLCs, and Bently Nevada System 1 software for centralized asset management.

Physical Integration

Weighing 1.2 kg and occupying a half-height slot (38 mm width) in the 3500 rack, the 3500/42 135489-02 saves valuable panel space. This module consumes 8.5 W from a 24 VDC supply and operates reliably from –20 °C to +65 °C, making it suitable for harsh industrial environments. Its IP20-rated housing provides basic protection against incidental contact and dust ingress.