3
Model 763A Gage Pressure Transmitter
Section 1
Section 1—Introduction
General
The Model 763A Gage Pressure Transmitter provides a 4-20 mA or 10-50 mA
proportional-to-gage-pressure signal for transmission to remote receiving,
control, or readout devices.
The electronic components of the 763A are housed in a pressure-sealed enclo-
sure. The instruments are designed to operate beyond their normal operating
-
ment of a nuclear power plant under adverse accident and post-accident
conditions. These adverse environments include severe changes in ambient
pressure, temperature and humidity, seismic events, and radiation exposure.
Product Description
Gage Pressure Transducer Assembly
The pressure-sensing element is a C-type Bourdon tube that actuates the elec-
tronic transmitter circuit. The pressure elements are available in Haynes Alloy
#25, which is compatible with most process media requirements and available
in ranges between 0-300 psig and 0-3,600 psig.
!
WARNING: Do not tamper with the Bourdon tube inside the enclosure or
the delicate wires connected to it (Figure 3.4,
page 16
). Improper handling
can damage connections and cause the transmitter to be inoperable.
Electronic Transmitter
The electronic transmitter supplies either a 4-20 mA or a 10-50 mA direct
current output signal that is proportional to the gage pressure sensed by the
Bourdon tube. The output signal is transmitted over a two-wire transmission
line to remote receiving devices.
Power Supply
A regulated direct current (DC) power supply is required to operate the trans-
mitting loop.
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