Description
The BRT243 applies a constant current to a resistance device. On change of resistance value the voltage drop across the resistance device will change and becomes the input signal. The BRT243 is ideal for in field enclosures or as a space saver in larger control cabinets. Standard output is 4 – 20mA with a minimum supply voltage of 6.3V. This enables the BRT243 to be used in 12V battery supply systems or in automotive applications. Other factory set output configurations are 10 – 50mA loop powered and 0 – 10mA, 0 – 20mA or voltage output in 3-wire connection up to 40Vdc. Double surge protection is standard with all Series 200 loop powered transmitters to prevent failure due to spikes induced by DC switched inductive loads. The input is isolated from the output as standard. Base calibration is set with 2 metal film resistors on the input card. This input card consists basically of a precision current source adjustable by a 15-turn potentiometer located on the input card. A buffer amplifier is used to condition the input voltage to the uniform card output of 0 – 1V. Final calibration is trimmed using the front accessible zero and span 15-turn trim adjustments. A front mounted L.E.D. and a test socket verify module function and assist in calibration checks without disconnection of output wires.
