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▷ When reinstalling, the union nut will be turned to
the original position and then further tightened
through approx. 30°.
0 Once the installation and tightness test are com-
plete, see page 5 (Tightness test), protect the
pressure test point against external access with
the sealing sleeve and the seal.
Pressure test point on outlet
connector (optional)
BS4161-compliant pressure test nipple
▷ Use a 10 mm spanner to release/tighten the
test point screw.
▷ The test nipple is secured to prevent it turning
with the screw.
Opening the test nipple
Remove the screw from the test nipple com-
pletely.
▷ The gas connection is open.
Closing the test nipple
Insert the screw by hand as far as possible.
Tighten the screw with a torque of 3 Nm +
0.5 Nm.
Check for tightness, see page 5 (Tightness
test).
WARNING
If the test nipple has unexpectedly come loose,
the gas meter must be regarded as damaged and
must be replaced.
Tightness test
▷ Check the pipework for leaks prior to installation
of the meter, in case the pipework is tested with
a greater test pressure than the max. allowable
operating pressure p
the installed meter may be damaged.
▷ Ensure the customer's consumers are closed.
Apply the test pressure slowly to the meter.
for the meter. Otherwise,
max
2
2
2
▷ If a pressure measuring line has been retrofitted
to the meter, check this connection for tightness.
▷ If the BS4161-compliant test nipple on the meter
has been opened and then closed again, test
this connection for tightness.
After the tightness test, slowly vent the meter.
4 If a pressure measuring line has been retrofitted to
the meter, protect the pressure test point against
external access with a sealing sleeve and a seal.
Commissioning
Once the tightness test has been successfully com-
pleted, the meter is ready for operation. Where ap-
plicable, further instructions are required for a fitted
index.
▷ Slowly open the manual valve.
Maintenance/Removal
Meters BK V2 to BK V12 from Elster are mainte-
nance-free. Where applicable, further maintenance
instructions are to be observed for a fitted index.
▷ If the screw unions are loosened for maintenance
work or retesting, replace the seals.
▷ After the meter has been removed, immediately
close the connectors with protective caps in
order to prevent ingress of dirt particles.
WARNING
A certain amount of gas may remain in the meter.
Taking into consideration the risk of explosion, it is
important to adopt safety measures, e.g.:
–
Following removal of the meter, purge it thor-
oughly with inert gas.
–
For transporting the meter with gas residue, use
a vehicle with an open or a ventilated loading
area.
GB-5
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