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Service Manual
Third edition, June 1997
6.4 Inert Gas Pressure Sensor (Option)
IG Pressure Sensor in
Parabolic Antenna
Transmitter
Figure 6-6. The IG pressure sensor in the Parabolic and the Cone
Antennas.
WARNING!
Closed tank condition can not be maintained when removing the
gas pressure sensor. The tank atmosphere is exposed to deck envi-
ronment. The IG-pressure sensor must not be removed without
permission from officer in charge.
Note: The inert gas pressure sensor is an optional equipment
installed in the Transmitter Unit at the delivery.
The inert gas pressure sensor is installed in the Transmitter
housing. The installation differs slightly between the Para-
bolic Antenna and the Cone Antenna. See figure 6-6.
The sensor is in contact with the tank atmosphere through
the nipple and either through the bottom of the transmitter
housing or through the Waveguide Cone. These holes can
become clogged and may need to be cleaned.
The IG pressure sensor measures the pressure relative to the
atmospheric pressure outside the transmitter housing. There
is a small venting hose from the sensor to a nipple in the wall
of the transmitter housing for the reference atmospheric
pressure.
IG Pressure Sensor
in Cone Antenna
Transmitter