Bently 3500/42M-01-00 Four Channel Displacement/Velocity/Acceleration Monitoring Module
1、 Basic Information
Brand origin: Bently Nevada (under Baker Hughes), original from the United States
Complete model: 3500/42M-01-00
Front card part number: 140734-01/140734-02
Matching terminal board: 128240-01 (external terminal)
Definition of model suffix
42M: Split front and rear card architecture, compatible with eddy current and seismic (velocity/acceleration) sensors
-01: Built in intrinsic safety barrier version, can be directly used in explosion-proof hazardous areas without the need for additional 3500/04 safety barriers
-00: Standard universal configuration, no special customization function
Shutdown status: Not stopped, normal production by the original factory, can place original factory futures, sufficient spot circulation

3500/42

3500/42

2、 Core function (4-channel programmable monitoring)
Single card with 4 independent channels, configured in pairs, supporting eddy current displacement sensors and seismic velocity/acceleration sensors, covering the full monitoring of the unit:
Axial radial vibration, axial thrust displacement, differential expansion, eccentricity, REBAM bearing monitoring
Shell vibration (velocity), shell acceleration, absolute shaft vibration
Each channel has independent Alert warning+Danger two-level alarm relay output
Isolate 4-20mA analog output per channel, upload DCS/PLC trend acquisition
Support hot swapping, replacing cards without interrupting the unit protection logic
3、 Electrical technical parameters
Rack power supply: Backpanel 18-32VDC, typical power consumption 7.7W Bentley
Sensor power supply: Eddy current probe circuit -24VDC
Input adaptation to three types of sensors:
Eddy current probe (3300XL series)
Velocity seismic sensor (piezoelectric/magneto electric type)
Accelerometer
The sensitivity measurement software is configurable and compatible with API670 unit protection standards
Working temperature: 0 ℃~+65 ℃ (with built-in safety barrier version); Storage -40 ℃~+85 ℃
Humidity: 5% to 95% RH, no condensation, SIL2 safety certification
4、 Size and weight (front card of the entire set)
Dimensions (height x width x depth): 241.3mm x 24.4mm x 114.3mm
Net weight of bare card: approximately 0.91kg
Original independent packaging gross weight: 1.2-1.3kg (including anti-static bag and instruction manual)
Compatible with 3500/05 standard 19 inch system rack single slot installation
5、 Model differentiation (key to ordering and selection)
3500/42M-01-00 (your model): Built in internal safety barrier, can be used directly in explosion-proof areas, no need to pair with 3500/04
3500/42M-00-00: No built-in safety barrier, explosion-proof conditions must be equipped with an additional 3500/04 isolation module
Old integrated 3500/42 (without M suffix): gradually limited in procurement, recommended to replace with 42M split version for more convenient wiring maintenance
6、 Typical application scenarios
The TSI safety monitoring system for thermal power steam turbines, gas turbines, large reciprocating compressors, centrifugal air compressors, blast furnace fans, and oxygen production units achieves interlocking shutdown protection for bearing vibration, shaft displacement, and shell acceleration.

7、 Procurement Instructions
Brand new original warranty for 12 months;
It must be paired with the corresponding rear terminal board (128240-01) for complete use, and the front and rear cards should be matched one by one;
Priority should be given to using the -01 version with built-in safety barriers for explosion-proof projects to reduce the occupation of cabinet slots.