The MTL4045B accepts a 4/20mA signal from a safe-area controller and repeats it to drive a current/pressure (I/P) converter or any other load up to 800_ in a hazardous area. The output capability is 16V at 20mA and the drop across the input terminals is low (4V). The input and output circuits float independently. Process controllers with a readback facility can detect an open circuit in the field wiring since, if this occurs, the resistance across the input terminals will change to a preset high value. No short circuit detection.

Power requirement, Vs

– – 50mA at 24V dc with 20mA signal

– – 55mA at 20V dc

– – 40mA at 35V dc

Power dissipation within unit

– – 1.0W maximum at 24V with 20mA signal

– – 1.2W at 35V

Isolation

– – 250V ac between safe- and hazardous-area circuits.