Sheet #673u – Definition, characteristics and measurement principles
Version 1.04a User guide ATEQ 6th series Page 5/7
3.1.3. Direct pressure measurement
FILL STABILISATION TEST DUMP WAIT
The measurement cycle consists of 5 phases:
1 2 3 4 5
Start
Coupling
time
(wait)
Fill time
Stabilization
time
Test
time
Dump
time
Cycle
end
Start
Cycle start
Coupling
time (wait)
The time during which the sealing connections are made to the test
parts before they are filled. The instrument may be fitted with the
optional automatic connector. This valve is controlled for the duration of
the cycle to enable the checking of the installation of the expandable
joint connectors.
Fill time
Pressurization of the test and reference parts. At the end of the fill time,
the ATEQ instrument checks the test pressure against the pressure
thresholds. If this is not correct, it will signal a test pressure fault.
Stabilization
time
The test and reference parts are completely cut off from the air supply,
but are pressurized to the test pressure. Pressure and temperature will
then stabilize between the two parts which communicate and act
similarly. If the test pressure is incorrect (a large leak on one of the
volumes) the test pressure will drop rapidly, the instrument will not
move on to the test mode and will indicate a fault.
The test time
The test and reference parts are isolated from each other and the leak
sensor measures the difference in pressure between them. The signal
is electronically assessed and displayed; the part is then diagnosed as
good or bad.
The dump
time
Return of the parts to atmospheric pressure.
End of
Cycle
Once the dump has been carried out, the instrument sends the end of
cycle signal and the automatic connector valve (optional) is
deactivated. This valve can control one or more expandable connectors
from the beginning to the end of the cycle.
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