Dynascan LeakVIE M016, Руководство пользователя

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D016 - 047 - 1 LeakVIEW User Guide Page 16 of 22
LEAKVIEW OPERATION
5.3.1 THE TEST PHASE
The system will execute the following test phase:
Evacuation
1.
The system will start evacuating the tank until it reaches the specified ‘ target vacuum ’.
During this stage the Test Status indicator will display EVACUATING or SLOW EVACUATING ,
and a timer will also start counting towards a limit as set in the Evacuation Timeout parameter.
If for any reason the Vacuum generator does not manage to fully evacuate the tank before the
Evacuation Timeout ends then the system will stop the evacuation process and return to the
READY state.
The Live Vacuum reading is displayed under the Target Vacuum parameter, this reading will
increase during the evacuation stage until it closely matches the ‘ Target Vacuum ’ setting .
Main test in progress
2.
Once the target vacuum has been reached , the system will hold the vacuum at that level for the du-
ration set in the Test time setting and the Test Status indicator will display MAIN TEST IN PRO-
GRESS .
During this phase, If the vacuum level drops below 98% of the target vacuum level the vacuum
generator will start and the system will restore the vacuum level by pulse - evacuating the test
chamber.
End of test
3 . At the end of the test time period the system will release the vacuum in the test chamber by allowing
air to pass back into the chamber, at the same time the Test Status indicator will display ’ VENT-
ING ....PLEASE WAIT ’
After the venting is complete, the Test Status indicator will display READY and is now ready for
the next test.
5.3.2 RESETTING THE SYSTEM
The system can be reset at any time during a test by pressing the RESET button. When the RESET
button is activated, the system will abort a test and immediately move on to the Venting stage, during
this stage the system will release the vacuum in the tank by allowing air to pass back into the tank , the
test status indicator will display VENTING ....PLEASE WAIT
Once the venting process is completed and the pressure in the tank has returned to normal atmospheric
levels, the Test Status indicator will display READY and is now ready for the next test.
5.3.3 LEAK DETECTION
When the test cycle is being executed the pack should be examined for signs of bubble emission (or
even failure).
It is sometimes the case that a bubble stream is only emitted when the vacuum is
increasing. In these cases, particular attention should be paid to observing likely leak
sites during the
Evacuation Phase .

NOTE