12
3 Operation
3.1.3
Test of working order
CAUTION!
Test of working order (i. e. serviceability determina
-
tions) may only be carried out by sufficiently qualified
members of staff who are familiar with the prevailing
national regulations (in Germany, for example: TRGI).
All relevant safety procedures and accident preven
-
tion regulations have to be taken into account.
Test of working order are carried out to determine and evaluate
the operational safety of low-pressure gas installations. A built-in
flow rate sensor is used to measure the amount of gas which is
streaming into the gas installation over a defined period of time
(leakage rate).
3.1.3.1 Preparations
There are different ways to install the instrument in the supply
system (see section 7.4):
–
Flow measuring principle (at the location of the gas meter)
– Measuring principle of the return flow (at an arbitrary place of
the pipe)
–
Check of non-metered pipes
–
etc.
z
Switch the instrument on.
z
Connect the instrument to the supply system. Use the corre-
sponding quick-release connections for this which are installed
on the instrument.
z
Apply the required testing pressure.
z
Check whether a
W
for the testing mode
Test of working order
is visible in the upper left section of the display. If necessary,
adjust the testing mode
Working order
(see section 3.1.1.2).
