| 摘要 |
<p>A self-contained pressure sensing cell responsive to an applied input pressure to produce a force for deflecting the pivoted force beam in the transducer section of a transmitter for converting the pressure into a corresponding signal. The cell includes a housing that is seatable within a well formed in the meter body of the transmitter and communicating with a chamber therein into which the lower end of the beam is extended. The cell housing is divided into a rear section, a mid section and a front section. Disposed within the rear section and integral with the wall thereof at its junction with the mid section is a wafer functioning as a flat sensing diaphragm. The flat diaphragm is provided with a connector pin that projects into the body chamber and is joinable to the beam whereby deflection of the flat diaphragm results in a corresponding beam deflection. Supported within the front section adjacent the mouth thereof is a convoluted barrier diaphragm behind which is a back-up nest seated within the front section. The free space between the face of the nest and the barrier diaphragm communicates through a tube in the nest with a fill chamber defined by the space between the back of the nest and the wafer, the intercommunicating spaces being filled with hydraulic fluid whereby movement of the barrier diaphragm in response to an applied pressure is hydraulically transmitted to the sensing diaphragm to produce a force which deflects the beam.</p> |
