1. General Information

• Manufacturer: Bently Nevada (Baker Hughes)

• Part Number: 136719-01

• Model Match: 3500/04 Seismic Monitor Module

• Product Name: Four-Channel Seismic Vibration Monitor Main Board

• Series: 3500 Machinery Protection System

• Module Type: Full-height casing vibration dedicated main board

• Application: Specialized casing vibration monitoring for bearing housing, pump casing, fan shell and machinery external vibration; exclusively used for accelerometer and velocity seismic sensors, no proximity probe support.

• Matching I/O Board: 136720-01 (Rear termination board)

• Compliance: API 670

2. Functional Description

• Channel Configuration: 4 independent seismic vibration input channels

• Supported Sensor: Velocity Sensor / Accelerometer (Seismic type only)

• Monitoring Parameter: Casing Vibration, Housing Vibration, Peak Velocity, Acceleration

• Alarm Logic: Programmable Alert & Danger setpoints per channel

• Signal Processing: High-pass filtering for mechanical casing vibration noise suppression

3. Electrical Specifications

• Backplane Power: +5 VDC from rack backplane

• Power Consumption: 9.0 W typical

• Sensor Power: +24 VDC for seismic sensor excitation

• Frequency Response: 0.5 Hz ~ 10 kHz

• Analog Output: 4-channel isolated 4-20mA output, Max 600 Ω load

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

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 single slot seismic monitoring module

• Dimensions (H × W × D): 241.3 × 24.4 × 241.8 mm

• Weight: Approximately 0.88 kg

• Mounting: Hot-swap capable, external rear board wiring design

6. Compatible Devices

• Matching Rear Board: 136720-01 (Exclusive seismic rear terminal board)

• Applicable Sensor: Velocity transducer, Piezoelectric accelerometer

• Rack Chassis: All standard 3500 series racks

7. Key Features

• Pure seismic vibration acquisition, optimized for casing housing vibration

• +24VDC sensor power (different from -24VDC proximity probe card)

• High anti-interference for pump/fan auxiliary equipment vibration

• Independent four-channel programmable configuration

• Stable measurement for low-frequency mechanical housing vibration

8. Critical Difference (Core Distinction)

• 3500/04 (136719-01): Seismic only, +24VDC, casing vibration, accelerometer/velocity.

• 3500/40M: Probe only, -24VDC, shaft displacement, eddy current probe.

• 3500/42M: Dual-purpose, Probe + Seismic both supported.