15
3 Operation
3.1.4
Main test
CAUTION!
Main test may only be carried out by sufficiently quali
-
fied members of staff who are familiar with the prevail
-
ing national regulations (in Germany, for example:
TRGI). All relevant safety procedures and accident
prevention regulations have to be taken into account.
Main test are leak tests which are used to detect even the small
-
est leaks. For this, the pipes are checked with all fittings – but
without gas equipment and corresponding controllers and safety
instruments. The gas meter can be included in the test.
Depending on the relevant country, there may be different na
-
tional regulations with respect to main tests. According to TRGI,
the following requirements have to be met:
z
The minimum test duration is 10 minutes.
z
During the test, the pressure must not decrease.
Note:
The minimum test duration is sufficient for standard
housing constructions. For installations/construc
-
tions with a larger volume, the test time may be
correspondingly longer.
3.1.4.1 Preparations
z
Switch the instrument on.
z
Connect the instrument to the supply system. Use the corre-
sponding quick-release connection for this which is installed
on the instrument.
z
Apply the required testing pressure.
z
Check whether an
M
for the testing mode
Main test
is visible
in the upper left section of the display. If necessary, adjust the
testing mode
Main test
(see section 3.1.1.2)
.
z
Wait for the temperature equalisation.
