Buchi DuMaster D-480, Operation Manual

Page: 311 / 354

Operating instructions DuMaster D-480 ©BÜCHI Labortechnik AG
10 - Menu and dialog descriptions 311

Reacting to a power failure
(on page 245).

Maintenance work to be performed by the customer.
Leak test: Test phases (Dialog)
Function
This dialog displays the current status while performing a leak test.

The left half of the dialog displays the individual stages of the test. The current stage of the test is
marked with an arrow.

The right half of the dialog displays the remaining time of the respective stage of the test and
system pressure.

The result is displayed at the bottom of the dialog once the test is finished.
Open
Open the dialog by clicking
Start
in the "Leak test" dialog.
Elements
The following describes the elements of the dialog.
In the left area:
Label Element type Meaning
Pressure build-up Label The valves are switched to positions allowing pressure
build-up in a certain section of the system (first stage of the
test).
Stabilization Label The gas inlet valve is closed. The system waits for a set
time to allow stable pressure conditions in the subsequent
test stage. If system pressure does not reach a defined
minimum pressure after this stage has ended, the leak test
is regarded as having failed. If minimum pressure is
reached, the system moves on to the next stage.
Test Label The initial pressure of the instrument is recorded at the
beginning. During this stage of the test, the system
constantly compares current pressure with the initial
pressure previously measured and calculates the current
drop in pressure. If the drop in pressure exceeds a certain
threshold during this stage of the test, the leak test is
regarded as having failed. If the drop in pressure stays
below the threshold, the system moves on to the next
stage.
In the right area:
Label Element type Meaning
0 ... x Sec. Label This field displays the remaining time of the respective
stage of the test.
Pressure, current Label This field displays instrument pressure.