The P74 series of differential pressure switches incorporate two opposing pressure elements and an adjustable range setpoint spring with a calibrated scale. The control switches at the indicated setpoint on an increase in differential pressure and switches back to the normal position when the different pressure decreases to the setpoint less the mechanical switching differential. 8/70 PSI 15 B DIFF. 8/30 PSI ADJ; LO-OPEN 15+/-2 PSI;
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