Bently Nevada 3500/40 135489-04 Proximitor I/O Module

Technical Specifications

Parameter	Details
Product Type	Proximitor I/O Module
Compatibility	Bently Nevada 3500 Series Monitoring System
Number of Channels	4 independent channels
Input Type	Eddy current proximity probes (3300 XL, 3300, 7200 series)
Input Signal Range	–0.8 V to –21.0 V DC (bias voltage)
Output Signal	0 V to –10 V DC (buffered output per channel)
Measurement Range	0 µm to 2000 µm (adjustable per channel)
Frequency Response	0 Hz to 10 kHz
Accuracy	±0.2 % of full scale
Resolution	16-bit (0.001 V)
Sample Rate	100 samples per second per channel
Gap Voltage Output	–0.8 V to –21.0 V DC (terminal block)
Alarm Outputs	4 relay outputs (form C, configurable)
Communication Protocol	Modbus RTU, Modbus TCP/IP
Dimensions (H x W x D)	241 mm x 38 mm x 254 mm
Weight	1.3 kg
Power Supply	24 VDC nominal (18 VDC to 32 VDC)
Power Consumption	9.0 W typical
Operating Temperature	–20 °C to +65 °C
Storage Temperature	–40 °C to +85 °C
Protection Class	IP20
Certifications	CE, CSA, ATEX, ABS

Four-Channel Proximity Signal Processing

The 3500/40 135489-04 Proximitor I/O Module handles up to four independent eddy current proximity probe inputs. This module converts raw probe signals into both gap voltage and displacement measurements. It provides a direct buffered output for each channel, ranging from 0 V to –10 V DC. Moreover, the module supplies the necessary radio frequency excitation for connected proximity probes, eliminating the need for external drivers. This integrated design simplifies wiring and reduces panel space requirements.

Precision Measurement and Filtering

This I/O module delivers high-fidelity data with an accuracy of ±0.2 % of full scale. Each channel offers configurable frequency response from 0 Hz to 10 kHz. Users can apply low-pass, high-pass, or band-pass filtering to isolate specific vibration frequency bands. Additionally, the 3500/40 135489-04 outputs raw gap voltage at the terminal block. This feature allows technicians to verify probe mounting and static position during commissioning.

Alarm and System Integration

The 3500/40 135489-04 includes four form C relay outputs for alert or danger signaling. Operators can program independent alarm setpoints for each channel to suit different machine protection philosophies. The module interfaces with the 3500 rack backplane for high-speed data sharing. It also supports Modbus RTU and TCP/IP protocols for connection to plant DCS systems or remote monitoring workstations.

Installation and Environmental Specifications

Weighing 1.3 kg and measuring 241 mm x 38 mm x 254 mm, this module occupies a single half-height slot in the 3500 rack. It operates reliably in temperatures from –20 °C to +65 °C. The 3500/40 135489-04 consumes 9.0 W from a nominal 24 VDC supply. Its robust construction suits demanding industrial environments, including power generation, oil and gas, and heavy manufacturing facilities.