The PSR-1 is a Light Sensitive Resistor that may be used as an input to indicate the presence of light at the sensor location. The PSR-1-T is a PSR-1 coupled with a B420-P transmitter.

The PSR-1-T produces a 4 - 20mA output signal. The sensor is designed to be mounted in the end of a weatherproof conduit box.

The PSR-1 has a resistance in darkness in excess of 1 Mohm and resistance in bright light of less than 1.5 k ohm.The PSR-1and PSR-1-T indicate the presence of absence of light.

They should not be used for foot-candle control of occupied spaces. The PSR-1-T is calibrated for 4mA in bright light > 100 foot candles and 20mA in darkness < 0.1 foot-candles.

    Output (non-linear) >1 M ohm in dark
<1.5 k ohm in bright light
    Temperature -25C - 75C (-13F - 167F)
    Power 12 - 35 VDC
    Max current draw 22mA
    Output (linear) 4 - 20mA(current limited to 22mA)
    Temperature -25C - 75C (-13F - 167F)