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resolution of 10 Pa.
The E4500 allows the user to customize the stabilization phase through the following parameter:
WAIT TIME: it is the stabilization time and can be set by the user from 15 to 99 minutes. Please note that the UNI
7129 standard requires that the stabilization takes no less than 15 minutes, However, the wait can be interrupted
by activating the context key '' although the range is not finished.
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Once the stabilization parameter has been set the user can proceed with the tightness test. By pressing the key
relative to the context key '
screen which displays the pressure reading of the inputs of the device.
After zeroing the device and putting the system under a pressure of at least 100 hPa, it is possible to start the
tightness test by pressing the key relative to the context key '
stabilization screen, the following values are displayed:
P:
Actual pressure measured by the instrument, in the selected measurement unit.
∆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 15 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 drop is greater than -10 Pa.
leak when the pressure drop is smaller than -10 Pa. 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.
', first the test pressure is indicated, as required by law, then you can access a
94
o o o o
', which starts the stabilization phase. In the
K000000000EJ 023826A0 100714
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