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Measuring principle
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Diaphragm/Piston Pressure Sensing Assembly Fh = Force, Hi Pressure Fl = Force, Lo (Bias) Pressure Fs = Force, Range Spring Fd = Force, Resultant Differential Basic design is a Static ¡°O¡± Ring diaphragm/piston pressure sensor. Process pressure acts on the diaphragm/piston to produce force Fh. It is counteracted by the adjustable range spring that produces force Fl. Fh ¡ª (Fl + Fs ) = Fd or the Hi-side force minus the sum of the Lo-side force and the spring force equal the resultant force Fd which actuates (deactuates) the SPDT electrical switching element. There are only three wetted parts on the Hi side (process pressure): pressure port, diaphragm and o-ring. A wide selection of wetted parts materials for process compatibility and containment is available. The Lo-side pressure media is limited to clean, dry air or inert gas, because the housing is pressurized to bias the piston.

Application guidelines

.Filter monitoring ¨C automatic backwash, clog and
change indication, proving flow
.Feed pressure monitoring
.Refrigeration systems
.Water Treatment
.HAVC
.Ventilation

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