User Manual for the Type 8300 Compatt 6
(and Variants)
UM-8300-Compatt 6
Issue B3
Further testing is then carried out at nominal 20% steps of the sensor’s pressure range, to ensure the
sensor functions correctly over the full range. In order to confirm the calibration to the full accuracy of
the sensor, a pressure source with an accuracy of an order of magnitude better that the accuracy of
the sensor would be required; such equipment is not commercially available. As these tests are to
prove functionality, a suitable test limit is used for this phase of the testing.
8.7 Pressure Relief Vent Valve
A pressure relief vent valve is fitted to automatically release any build-up of pressure inside the
instrument during deployment. This could be caused by water ingress during deployment and/or the
degassing of a battery.
The pressure relief vent valve should be flush with the endcap face. If the pressure relief vent valve is
not flush it should be operated to check for and release any internal pressure.
The pressure relief vent valve should always be operated before performing any maintenance work.
8.7.1 Operating the Pressure Relief Vent Valve
WARNINGS
Due to the high internal pressure risk, dismantling the sub-sea equipment must only be carried
out by trained personnel.
Do not stand in direct line with the end of the transponder when operating the pressure relief vent
valve. Sudden release of high pressure gases could cause injury to personnel. Wear Personal
Protective Equipment such as goggles when operating the pressure relief vent valve.
Pressure Relief Vent Valve
M4 bolt (not supplied)
To operate the pressure relief vent valve:
1. Screw an M4 bolt into the pressure relief vent valve.
2. Slowly pull the M4 bolt to withdraw the vent valve and wait for any internal pressure to be
released.
Section 8 – Maintenance
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