The PS-OW is a diaphragmactuated electric control operated by pressure or vacuum. Pressure or suction applied to the diaphragm moves it against the adjustable spring and operating mechanism. When pressure or suction exceeds the spring setting, the mercury switch closes or opens. Three adjustable spring pressure ranges are available and springs are easily interchanged in the field. Switches are used to assure proper operation of combustion equipment by proving adequate fuel and air pressures and flows.
Range 0.2'' to 27'' W.C. with same switch - Change in spring only
Requires only screwdriver for field pressure adjustments
Pressure connections on bottom to eliminate condensation problems
Large pressure chambers absorb pulsations - eliminate nuisance shutdowns
Simple installation 3-point mounting brackets and bubble level included
Switch position visible through window
Switch assembly can be replaced without disconnecting
All switches factory tested before shipment
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