Elster EK280 - Assembly on a Wall; Three-Way Valve

34 Assembly, Connection and Putting into Operation
5.1.3 Assembly on a wall
Fig. 8
1. Bore four holes in the po-
sitions marked on the wall
(see dimensions in
Fig. 8).
2. Select wall plugs which
correspond to the size of
the screws and insert
these in the boreholes in
the wall.
3. To fasten the EK280, four
M5 x 40 mm wood screws
should be used for wall
assembly.
5.1.4 Three-way valve
When mounting the pressure sensor, a three-way valve is usually incorpo-
rated in order to test the pressure sensor in an installed condition or to ex-
change a faulty sensor without switching off the entire gas pipeline. The
three-way valve available from Elster is constructed as follows:
Fig. 9
i1 : From the meter: From the pressure
connection of the gas meter.
For diaphragm gas meters, this
takes place on the input side of the
meter.
i2 : To the VC: For the connection of
the pressure sensor to the volume
corrector.
i3 : Test connection: Possible to take
the test pressure or to assert ex-
ternal pressure on the pressure
sensor of the volume corrector.
When mounting the three-way valve, it must be ensured that
the position of the control lever with the corresponding outlets
is checked as the lever can be removed and may be mounted
the wrong way round.
The pipeline from the pressure sensor to the meter must be
laid at an angle in order to ensure that water does not damage
the pressure sensor or affect the measurement accuracy.
Prüfen mit
Betriebsdruck
Betriebs-
stellung
Prüfen mit
Frmddruck
Absperrung
45° Stellung
1
2
3