The Model 140 provides outstanding capabilities not previously available in a modestly priced differential pressure gauge/switch. It is ideally suited for use on dissimilar fluids, wet gas or fluids with a high concentration of solids, etc for use on filters, strainers, pumps, liquid level, and local flow indication, etc.
Differential pressure is sensed by a flexible elastomer diaphragm and acalibrated range spring.The diaphragm assures total separation betweenthe high and low pressure signals.It is totally supported at full travel ineither direction.The Model 140 is protected against overrange to its ratedworking pressure. A magnetic coupling transmits the sensing element motion to the indicatingpointer.This prohibits the possibility of process fluid leaking into the gaugecase, while assuring total isolation of the process fluid within the pressure capsule.The gauge case, either 2-1/2", 3-1/2" or 4-1/2" dial size, is constructed of arugged corrosion resistant engineering plastic or aluminum with a shatterresistant acrylic lens.The bezel screws and all internal wetted metal parts are of stainless steel.
The Model 140 Delta Meter is available with either one or two hermetically sealed reed switches for either high alarm, low alarm,or both.The switches are Single Pole Double Throw (SPDT) or Single Pole Single Throw (SPST) with set points adjustable from 10%to 90% of the differential range of the instrument.Switches can be set to activate/deactivate on rising or falling pressure.The standard switch enclosure is non-corrosive molded plastic that is oil tight, dust tight, and water tight per NEMA 4X.Externalaccess to the switch adjustment is provided.CSA Listed Explosion Proof enclosures with SPDT or SPSTswitches rated Class I, Groups C & D, Class II, Groups E, F, & G areavailable.Switch leads are 24", 18 Awg, and are color coded where applicable.
The series 140/141 diaphragm range of dp gauges are now available ex-stock Sydney in various ranges from CMC Technologies.
