Pneumatic transducer for underground burial

Details Pneumatic transducer for underground burial Pneumatic transducer for underground burial

1977-06-27

1978-05-23

Swisher, S. Clement

Measuring and testing

Moisture content or absorption characteristic of material

73716, G01N 3324

Patent

active

040903974

ABSTRACT:
A transducer for converting fluid pressure into pneumatic pressure for relay to a remote readout station comprises a valve body having a chamber spanned by a diaphragm which divides the chamber into a pore-fluid pressure cavity and a transducer cavity. The pore-fluid pressure cavity is in communication with fluid pressure in the environment surrounding the buried valve body. Three ducts communicate with the transducer cavity. The diaphragm carries a centrally located resilient hemisphere within the transducer cavity in axial alignment with only one of said ducts which constitutes a vent from said transducer cavity. During operation, rising gas pressure is applied at a known flow rate to said transducer cavity through one of said ducts, other than the venting duct, until the pressure in said transducer cavity exceeds the pre-fluid pressure against said diaphragm whereupon the hemisphere separates or is displaced from said venting duct and venting occurs with the attained pressure being read on the said remaining duct fixed to a suitable gage.

REFERENCES:
patent: 2911989 (1959-11-01), Neuhars
patent: 3388598 (1968-06-01), Hall
patent: 3574284 (1971-04-01), Thordarson

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