K114 Issue No. 9
Druck ADTS 405 User Manual
5 - 9
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(7) Check that the Ps, Qc and Pt rates are less than or equal to ±0.5 mbar/min.
If the leak rate is not achieved, allow further thermal stabilization time and re-test by
pressing RATE TIMER and selecting [WAIT 05:00], [TIME 01:00].
(8) Press CLEAR/QUIT to exit rate display.
Vacuum Leak Check
This section verifies that the unit is leak tight under vacuum conditions.
(1) Press LEAK MEASURE/CONTROL to enter control mode.
The display shows “Aim” in place of “Leak Measure”.
(2) Enter a Ps aim of 100 mbar by pressing: ALT/Ps, 1, 0, 0, ENTER
(3) Enter a Qc aim of 0 mbar by pressing: SPEED/Qc, 0, ENTER
(4) Wait the required time for temperature stabilization e.g., one minute.
Press LEAK MEASURE/CONTROL return to Leak Measure mode.
(5) Press RATE TIMER and select [WAIT 05:00], [TIME 01:00]. Observe that
the "Waiting" time is shown on the display as it counts down, followed by the "Timing"
time.
(6) At the end of the "Timing" period, press ROC/Ps RATE to display the measured rate of
change of Ps (“T” is shown after the value indicating a timed average).
(7) Check that the Ps, Qc and Pt rates are less than or equal to ±0.5 mbar/min.
If the leak rate is not achieved, allow further thermal stabilization time and re-test
by pressing RATE TIMER and selecting [WAIT 05:00], [TIME 01:00].
(8) Press CLEAR/QUIT to exit special rate time display.
Range check
Using key presses based on the above, control the Ps and Qc pressures to the normal
limits of operation and make sure that these are achieved. Use minimum Ps and zero
Qc and then maximum Ps and maximum Qc.
Note: Do not exceed the maximum Pt as shown on the front panel of the unit.
Use maximum available rates of change to minimise test times.
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