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PIM 417-O
PITOT-STATIC LEAK TESTER TYPE D51600
Issue 5
November 2009
Page 19
R. When Set pressure has been achieved, the PSLT enters its settling mode (either the default
time of 2 minutes or the time set under Main Menu 3). The screen displays the caption
'SETTLE' and also the remaining time (
Figure 14 ).
Figure 14 Settling Period
S. Following the settling period, and before entering the checking period, the PSLT carries out a
coarse leak check. If system pressure drops by 33% or more from the Set Point during this
time, the leak check is halted and the screen displays a 'COARSE LEAK FAIL.' caption,
together with the failure rate (
Figure 15 ). This screen will continue to be displayed until
accepted by the Operator. This may be in one of several ways. If the failure is due to
something simple like a poor hose connection then, once rectified, the Operator can press
either the START key to return to the beginning of the test, or the SEL key to continue the test
from the point of failure. To abort the test completely, the STOP key is pressed as normal.
Figure 15 Coarse Leak Check
T. If the system passes the coarse leak check the PSLT continues with the main leak check.
During the check period, the real time leakage is displayed in the units in which the test is
being conducted. The caption 'CHECK' and the elapsed time are also displayed (
Figure 16 ).
Figure 16 Checking Period