with DIN 2440” of 10 m length has a pipe volume of 2 l.
6.3.3 Determining the leakage rate
Once the pipeline volume has been measured or entered the DC 2000
PRO
prompts the user to enter the test pressure, the test time, and the opera-
ting pressure of the gas line. Afterwards the line is to be pumped to the test
pressure (e.g. 100 hPa). To do so, replace now the syringe or the manual test
pump with the compressed air pump for applying the test pressure (see Sec-
tion 11). When the over- and underpressure lines have been swapped over by
accident, the text “Swap” appears on the display. When the pressure reaches
the preset test pressure the stabilising phase is initiated (default Stab. time =
ten minutes). This is marked with the trend symbols ▼▲. When the pressure
remains within ±10% of the test pressure during this stabilisation phase the
actual pressure loss test is started at the end of the stabilisation time (default
Time = ten minutes). During the stabilisation phase, e.g. when the pressure
drops greater than 5 hPa, the pressure loss test can also be initiated manually
at the ENTER key. The remaining test time and the current pressure values
are displayed alternately.
When the test time has ended or been cancelled with the C I/O key, e.g. when
the pressure drop is greater than 15 hPa, the cursor flashes at Utility life /
Leakage rate on the display and the results can be viewed in turn at each
press of the ± key as follows:
Difference: 9.9 hPa
± key
Start pressure: 108.83 hPa
± key
Time: 1 min
± key
Stop pressure: 98.96 hPa
± key
Leakage rate: 8.3 l/h hPa
± key
Text: “Print …” (activate the printout with the ENTER key)
± key
Difference: 9.9 hPa
etc.
6. Determining the leakage rate
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