1. General Information

• Manufacturer: Bently Nevada (Baker Hughes)

• Part Number: 133323-01

• Product Name: 3500/42M Rear I/O Termination Board

• Applicable Module: 3500/42M Proximitor/Seismic Monitor

• Module Type: Full-height rear I/O daughter board

• Application: Provides field wiring terminals for sensor input and 4-20mA analog output; signal termination and isolation for vibration, displacement and seismic measurement channels.

• Installation Rule: Installed on the rear side of 3500/42M module

• Compliance: API 670

2. Interface Definition

• Sensor Input Terminal: 4-channel termination for proximity probe, velocity sensor or accelerometer

• Analog Output Terminal: 4-channel isolated 4-20mA output for DCS connection

• Internal Connector: Gold finger interface for connecting 3500/42M main board

• Shielding Terminal: Common grounding point for sensor shielding wire

3. Electrical Specifications

• Sensor Power: -24 VDC for eddy-current proximity probe

• Input Impedance: 10 kΩ per dynamic channel

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

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

• Signal Bandwidth: 0.5 Hz ~ 10 kHz

• Terminal Rating: 300 V rated 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 rear termination daughter board

  • Dimensions (H × W × D): 242 × 22 × 160 mm

  • Weight: Approximately 0.25 kg

  • Mounting: Fixed on back of 3500/42M, non-detachable during normal operation

  6. Compatible Devices

  Exclusively compatible with 3500/42M vibration monitor main board; used for shaft vibration, thrust position and casing vibration measurement in 3500 rack system.

  7. Key Features

  • 4-channel universal signal termination for multiple sensor types

  • Isolated 4-20mA analog output for stable DCS data transmission

  • Built-in signal filtering and anti-interference circuit

  • Integrated shielding design for industrial harsh electromagnetic environment

  • Standard factory matching rear I/O board for 3500/42M assembly

  8. Difference between 133323-01 & 135489-01

  • 133323-01: Standard rear terminal board for ordinary industrial 3500/42M.

  • 135489-01: Intrinsically safe barrier version for hazardous explosive area.