BENTLY 3500/42 135489-01 is the core four channel monitoring component of Bentley 3500 mechanical protection system, designed specifically for vibration state monitoring of rotating machinery.

1. Core parameters
4-channel independent input, built-in intrinsic safety barrier, suitable for eddy current, velocity/acceleration sensor signals.
The working temperature range is -40 ℃~+70 ℃, with a power consumption of 7.7W, a power supply voltage of 220V, and a measurement accuracy of ± 0.33%.
The module size is approximately 241 × 24 × 99 millimeters, with a weight of 0.20-0.46 kilograms, suitable for installation in the rear slot of the 3500 series rack.
2. Key characteristics
Compliant with API670 industry standards, supports software configuration, and each channel can independently output 4-20mA proportional signals.
Capable of both digital and analog communication, supporting live plugging and unplugging of front monitoring modules, with strong fault tolerance.
Built in signal isolation design allows for deployment and use in hazardous areas without the need for additional external Zener barriers.
3. Typical application scenarios
Widely used in large and medium-sized rotating machinery such as steam turbines, compressors, fans, etc. in power plants, chemical plants, and refineries, it completes continuous monitoring of parameters such as shaft vibration, axial displacement, acceleration, etc., providing core data for equipment fault pre diagnosis.

4. Installation precautions
The I/O card cannot be directly hot plugged or unplugged. Before replacement, the power must be turned off and the wiring must be properly marked to avoid signal faults triggering device tripping.