1. General Information

• Manufacturer: Bently Nevada (Baker Hughes)

• Part Number: 125680-01

• Product Name: Proximitor Internal Termination I/O Board

• Applicable Module: 3500/40M Proximitor Monitor

• Module Type: Full-height internal termination daughter board

• Application: Built-in wiring terminal board for 3500/40M; collects shaft vibration, thrust position and eccentricity signal from proximity probes; no external rear I/O board required.

• Installation Rule: Pre-installed inside 3500/40M main housing

• Compliance: API 670

2. Interface Definition

• Probe Input Terminal: 4-channel internal screw terminals for eddy-current proximity probe

• Analog Output Terminal: 4-channel 4-20mA isolated analog output

• Internal Connector: Gold finger interface for 3500/40M main board connection

• Shielding Terminal: Integrated shielding grounding design

3. Electrical Specifications

• Sensor Power: -24 VDC for proximity transducer

• Input Frequency Range: 0.5 Hz ~ 10 kHz

• Analog Output Load: Max 600 Ω for 4-20mA loop

• Isolation Voltage: 1500 VAC channel-to-system isolation

• Input Impedance: 10 kΩ per dynamic channel

• Terminal Rating: 300 V built-in screw terminal block

4. Environmental Specifications

• Operating Temperature: -30 °C ~ +65 °C (-22 °F ~ +149 °F)

• Storage Temperature: -40 °C ~ +85 °C (-40 °F ~ +185 °F)

• Relative Humidity: 5% ~ 95% (Non-condensing)

• Anti-vibration: Compliant with API 670 industrial vibration standard

5. Mechanical Specifications

• Structure: Full-height internal termination daughter board

• Dimensions (H × W × D): 240 × 22 × 155 mm

• Weight: Approximately 0.22 kg

• Mounting: Internal fixed installation, no external rear board

6. Compatible Devices

7. Key Features

• Integrated internal terminal design without external rear I/O board

• 4-channel high precision shaft vibration and position signal acquisition

• Isolated 4-20mA analog output for DCS system transmission

• Compact structure, simple wiring and low failure rate

• Cost-effective for conventional non-hazardous industrial area

8. Critical Difference Comparison

• 125680-01: Internal I/O board for 3500/40M (Only displacement/probe signal, no seismic).

• 140471-01: Internal I/O board for 3500/42M (Dual vibration + displacement).