Pressure Measurement

Differential Pressure Transducer

Model 267/267MR (HVAC Application)

setra model 267 differential pressure transducer hvac application


Setra’s Model 267 and 267MR Differential Pressure Transducer sense gauge (static) or differential pressure and convert this pressure difference to a proportional electrical output. The 267 series is offered with a high level voltage output or 4-20 mA current output. The 267MR offers multi-range capability and field configurable 0-5 VDC or 0-10 VDC output, as well as a 4-20 mA output.

In a typical Setra configuration, Model 267 and 267MR has a compact housing contains two closely-spaced, parallel, electrically-isolated metallic surfaces, one of which is essentially a diaphragm capable of slight flexing under applied pressure. The diaphragm is constructed of low-hysteresis material such as 17-4 PH SS or a proprietary compound of fused glass and ceramic (Setraceramâ„¢). These firmly secured surfaces (or plates) are mounted so that a slight mechanical flexing of the assembly, caused by a minute change in applied pressure, alters the gap between them (creating, in effect, a variable capacitor). The resulting change in capacitance is detected by a sensitive linear comparator circuit (employing proprietary, custom-designed ASICs), which amplifies and outputs a proportional, high-level signal.