764 Differential Pressure Transmitter

The Model 764 Differential Pressure Transmitter provides a 4-20 mA or 10-50 mA proportional-to-differential pressure transmission for remote collection, control or viewing equipment. Model 764 electronic transmitter parts are positioned in a pressurized enclosure. Under such adverse conditions as may be discovered in containing a atomic energy facility under urgent and post-accident conditions, the instruments are designed to operate for a limited time beyond their normal operating environment demands. They include severe changes in air pressure, temperature and humidity, seismic events, and exposure to radiation.
The Model 764 transmitter includes an electronic circuit DPU. Production of 4-20 mA or 10-50 mA is compatible with a wide range of collection, energy and writing equipment. The instrument utilizes electronic circuits and a molecular-bonded strain gage tracking cantilever beam, powered directly through flying bellows within the DPU.
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764 Differential Pressure Transmitter

The mechanical actuator of the Model 764 transmitter is a dual bellows assembly linked by two stress housings. The dual bellows setupconsists of two inner bellows, a center block, overrange valves, a temperature compensator, a strain gage assembly, and range springs. The internal amount of bellows and center block is filled with a clean, non-corrosive, non-conductive liquid with a tiny freezing point and is shut.

This configuration also forms the cantilever beam of motion-sensing. The electronic transmitter offers a direct current output signal of 4-20 mA or 10-50 mA equivalent to the differential stress of the DPU. A two-wire transmission line transmits the entry signal to the remote processing facilities. The transmission circuit needs the accessibility of a regulated instant current (DC).


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