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∆P1': Pressure variation in the last minute, updated every 10 seconds. This value gives a rough indication
about the stabilization level reached in the piping system.
Wait time: Remaining time before the stabilization phase ends.
Once the stabilization phase is terminated the tightness test is started. This test is performed by observing how
the pressure decays in time during a fixed 5 minutes interval, as stated in the applied standard.
During the tightness test phase the following values are displayed:
P1: Pressure measured at the beginning of the test.
P2: Pressure actually measured by the instrument.
∆P: Pressure variation with respect to the initial value. In case the actual pressure is lower than the initial
value (pressure is decreasing) this value has a negative sign.
Wait time: Remaining time of the tightness test.
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After the tightness test, the results are displayed: the data displayed is as follows:
P1: Pressure measured at the beginning of the test.
P2: Pressure measured by the device.
∆P: Pressure variation between the last instant and the first instant of the test. If the pressure decreased, it
presents a negative value.
Result: Reports the test result:
tight when the pressure is within the limit of table 1.
leak when the pressure is outside the limit of table 1.
Positive pressure changes are symptom of a temperature change meanwhile the test is performed.
Should this happen it is advisable to repeat the entire test.
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