BWM (PS-11), Monitoring Instruments

Instrumentation and Automation

Monitoring Instruments

BWM (PS-11)

Product Description

Bearing wear monitoring for large two stroke diesel engines fitted in marine and offshore installations., , The PS-11 sensor is based on the eddy current principle and is used for measurements against electrically conductive, ferromagnetic materials. The sensors are mounted on specially designed bracket and fixed to the engine frame beneath the crosshead guide. A high-frequency alternating current flows through a coil cast in the sensor housing. The electromagnetic coil field induces eddy currents in the conductive target which alters the AC resistance of the coil. This change in impedance produces a linear electrical signal proportional to the distance of the target from the sensor. , , The measurements take place every time the crosshead pin passes Bottom Dead Centre (BDC) during engine running. The sensor is sampling at a speed of 2 kHz and a when the crank are a few degrees before BDC the sensor will sense that the surface is approaching. The distance measurement is compared with the reference obtained during installation and commissioning, which in turn determine the bear wear condition. The signal from the sensor is processed and transmitted to a bearing wear monitoring system via a CAN bus for alarm and indication purposes.

Product Ratings

Sensor Power Supplies: 18 to 32 VDC; | Power consumption: 0.8W to 1W | Protection rating for sensor and source: IP67; | Housing material: Steel to AISI 304; | Operating Temperature: 0 to 80 degree C; | Sensor communication protocol: CANopen bus.

Applicable Standards

Not Available / To be Updated