Options for Media Compatibility with Pressure Transducers

Endevco makes several types of pressure transducers using both piezoelectric (PE) and piezoresistive (PR) technologies. The two technologies offer distinct advantages.

Piezoelectric (PE) pressure transducers are dynamic devices and do not respond to static pressures. An example of where the non-static response is a plus would be when pressure transducers are used as microphones for measuring high-intensity sound. Endevco's PE devices feature stainless steel diaphragms. The product line includes the Model 2510 high-intensity microphone and the 500 series high-temperature pressure transducers used for combustion monitoring. These are rugged devices that are compatible with any media that does not affect stainless steel.

Sculpted silicon piezoresistive (PR) transducers utilize diaphragms that are in direct contact with the measurand (media). For these transducers, it is desirable that the media not be electrically conductive or corrosive to silicon. If the media, such as water, is conductive, electrical leakage to the back side of the diaphragm and noise can result. This design provides exceptional high-frequency response.

To summarize, piezoelectric transducers are compatible with most liquids, gasses and solids, while piezoresistive transducers are compatible with clean, dry, non-corrosive gasses and some petrochemical oils.


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