12 H49 29 53/73 100 Fax: 029 53/73 96 100
DC 2000
PRO
Figure 3.4 – Calibration record for a humidity sensor
3.5 Automatically alternating display
The program item
Measuring Mode AUTO
causes the display to alternate
between pressure, temperature, and air humidity values in the pressure and
temperature units chosen last.
4.
Stress test (DVGW-TRGI)
Lines with operating pressures up to 100 hPa can be pre-assessed in accor-
dance with DVGW-TRGI worksheet G 600 and the findings documented very
easily with the DC 2000
PRO.
First of all, the line must be sealed and a suitable test plug inserted. The
DC 2000
PRO
must be switched ON before it is connected to the test plug. After
zeroing, press the ± key to activate the menu item
stress test
.
The DC 2000
PRO
prompts you to pump to the test pressure (e.g. 1 bar or 1,000
hPa). 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 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
4. Stress test
Fig. 4.1
