Table 1 – Relative viscosity of various gases in accordance with Equation (4)
based on DVGW-TRGI
3. Setup —> Air pressure
Here you enter the current air pressure pcur in situ (QFE) in hPa for calcula-
ting the flow rate with Equation (2) and for determining the leakage rate with
Equation (5). This air pressure can range from 800 to 1200 hPa (default 1013
hPa).
4. Setup —> Clock
Here you enter the time and date. When the batteries are removed for no
longer than a minute, the clock does not have to be corrected. When the
batteries are removed for longer, the clock needs only to be put forward by
this time.
5. Setup —> ALPHA
This sets the weighting factor for the averaging function AVG in the form of
Equation (6). ALPHA can accept values between 0.01 and 0.99. The lower the
value for ALPHA, the less perceptible are the current fluctuations in the signal
(see also Section 7; default 0.90).
6. Setup —> Preassessment —> Pressure
Here you can set the test pressure for a pre-assessment (500–1500 hPa,
default 1 bar).
7. Setup —> Preassessment —> Time
Here you can set the time for a pre-assessment (1–300 min, default 10 min).
8. Setup —> Main assessment —> Pressure
Here you can set the test pressure for a main assessment (1–500 hPa, default
150 hPa).
9. Setup —> Main assessment —> Time
Here you can set the time for a main assessment (1–300 min, default 10 min).
10. Setup —> Stab. time
Here you can set the time for thermal stabilisation before the start of pre-
assessment, main assessment, and the determination of leakage rates.
When during this time the current pressure value remains within ±10% of
8. Setup Menu
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