BUCHI DuMaster D-480 - Manual (Page 242)

Operation Manual D-480 ©BÜCH Labortechnik AG
9 - Repairing the instrument 242
Performing a leak test
Purpose of the leak test
The leak test checks the instrument for leaks.
Performing a leak test
The instrument software includes two types of leak test: Rough leaktest and fine leaktest.
The rough leak test is used to check quickly the system for gas-tightness.
The fine leak test checks the gas-tightness of the system by using severer criteria and, in case a leak
has been detected, supports you during the leak search procedure.
Proceed as follows:
 Click Options > Diagnosis > Leak test. A message window appears which requests you to
confirm the execution of the leak test once more.
 Click Yes to start the leak test. The program opens the "Leak test: Whole device" dialog. The
tubing diagram of the analysis system is displayed.
 Click Start to begin "Whole System" leak test. The "Leak test: Whole device" dialog appears.
 The leak test begins. On the left, the arrow indicates the current stage of the leak test.
 The result of the leak test is displayed at the bottom:
 If the leak test has passed the symbol becomes visible.
 If the leak test has failed the symbol becomes visible.
 Print out the result if you wish. Click Print to do so.
 Click Close to close the dialog again.
 If the test for the whole system has not been passed, click now Next. This will activate the next
test stage. Here you will be informed how to proceed. Click Start to continue with the
corresponding test stage. The "Test Phases" dialog will open again showing the status of the
currently running test stage.
Note: Switching to the next test stage is only possible during performing a fine leak test!
 Continue with the stages described above until the result "Leak test not passed" is displayed.
The leak is then probably located at the blue indicated gas ways.
Further information
 Leak test (on page 302).
 Leak test: Test phases (on page 303).
 Leak test procedure (on page 243).