1. General Information

• Manufacturer: Bently Nevada (Baker Hughes)

• Part Number: 135473-01

• Product Name: Intrinsically Safe Internal Termination I/O Board

• Applicable Module: 3500/40M Proximitor Monitor

• Module Type: Full-height explosion-proof internal daughter board

• Application: Built-in intrinsically safe I/O board for hazardous area; provides signal isolation and explosion-proof barrier for proximity probes; used in petrochemical, oil & gas flammable and explosive working conditions.

• Installation Rule: Pre-installed inside explosion-proof type 3500/40M housing

• Compliance: API 670, ATEX, IECEx Intrinsically Safe Certification

2. Interface Definition

• Probe Input Terminal: 4-channel intrinsically safe screw terminals for eddy-current probe

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

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

• Explosion-proof Barrier: Built-in intrinsic safety isolation barrier for hazardous area

• Shielding Terminal: Enhanced anti-interference shielding grounding terminal

3. Electrical Specifications

• Sensor Power: Isolated -24 VDC intrinsically safe probe power

• Input Frequency Range: 0.5 Hz ~ 10 kHz

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

• Isolation Voltage: 1500 VAC reinforced isolation

• Intrinsic Safety Rating: Ex ia IIC T6 Hazardous Area Level

4. Environmental Specifications

• Operating Temperature: -40 °C ~ +70 °C (-40 °F ~ +158 °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 built-in explosion-proof termination board

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

• Weight: Approximately 0.25 kg

• Mounting: Internal fixed installation, no external rear board

6. Compatible Devices

• Matching Main Board: 176449-01 (3500/40M Main Board)

• Applicable Sensor: Explosion-proof eddy-current proximity probe series

• System Rack: 3500 series hazardous area certified rack

7. Key Features

• Built-in intrinsic safety barrier for flammable and explosive environment

• 4-channel isolated displacement signal acquisition for shaft vibration & position

• Reinforced anti-interference circuit for chemical plant complex electromagnetic field

• Integrated terminal design without external rear wiring board

• Wide temperature range for severe industrial outdoor conditions

8. Critical Difference (40M I/O Board Classification)

• 125680-01: Normal internal board, Non-explosion, power plant conventional version.

• 135473-01: Explosion-proof internal board, Intrinsic Safety, chemical & oilfield version.

• 133323-01: External rear board, common non-explosion separated wiring.