Process automation transducers

March 2006 Sensors & Transducers

LEM of Geneva, Switzerland has recently expanded its current and voltage transducers optimised for process automation. The accompanying picture shows examples of split-core and solid core, AC and DC current transducers, for protection, monitoring and control systems.

LEM offer a current transducer in the range of from 10 mA up to 10 kA with all of the popular process control outputs, ie, 0 to 5 V, 0 to 10 V, 4 to 20 mA and 0 to 20 mA. AC and DC current operated switches and ground fault sensors are also available.

Typical applications include analog control and condition monitoring and in the case of the switch protection and safety devices, pump jam and suction loss protection, fan and pump monitoring, DC power supply and battery monitoring, safety lighting monitoring, ground fault protection, monitoring of industrial electrical heaters, safety interlocks, detection of conveyor belt overload/underload and or jams.

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