Mike: Nearly every analog instrument uses the 4-20 mA loop. Field transmitters, positioners, and variable frequency drives ...

Solid state isolators (SSIs) can be an effective tool for providing isolation for programmable logic controllers (PLCs).

A novel transducer converting output signals of sensor modules to 4~20mA was designed. The interface was composed with digital controllable universal voltage-to-current converter (VIC) with a current ...