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Verfügbare Sprachen
Cold
water
Installation and Operating Instructions
GWF-Water meters
1. Field of application
Type
Pulser /Interface
Nominal flow rate
Q
3
Nominal diameter
DN
Max. operating pressure
PN
Temperature
T
Ambient temperature
T
amb
with flanged connections
1)
GWF water meters are suited for the measurement of low to
middle flowrates. These instructions contain all important in-
formation for the installation and operation of the above men-
tioned water meters. Installation, connection and maintenance
must only be carried out by expert technicians who, first of all,
have read and understood the operating instructions.
2. Sizing of the water meter
GWF water meters are to be sized according to the relevant
ratings. A continuous overload will lead to the meter being
damaged. The maximum overload flowrate Q
1,25*Q
, may only take place at a maximum of 1 hour per day
3
and over the life span of the meter a maximum of 100 hours
summed together. When specifying the meter the operating
conditions occurring in the application are to be considered. In
particular these are:
■
Nominal flow rate
■
Max. operating pressure
■
Operating temperature
■
Ambient temperature
■
Installation position (Riser- or down/fall housing)
3. Installation information
1. Singlejet meters (Unico
vertical pipe lines. Preferential is the installation in hori-
zontal pipe work. Multijet meters (MTK, MTW) can also be
installed in horizontal and vertical pipelines. For the in-
stallation in vertical pipe work, special meter housings are
available. The meter type plate must always face upwards.
2. For water meters no inlet and outlet distances must be ad-
hered to.
Unico
MTK
®
IPG/En-
IPG/En-
coder
coder
m
/h
2,5/4
2,5 – 25
3
mm
15/20
15 – 50
bar
16
16/25
1)
°C
30/90
30/50
°C
+5 ... +55 +5 ... +55 +5 ... +55
, calculated as
4
) can be installed in horizontal or
®
3. It is recommended to install shut-off valves before and after
the meter, to facilitate the installation and removal of the me-
ter for periodic inspection and maintenance work.
MTW
IPG/En-
coder
2,5 – 25
15 – 50
4. It is necessary to purge/rinse the pipeline before initial in-
16/25
1)
stallation of the water meter. In place of the meter a bypass
90
piece must be installed, so that foreign objects do not block
the strainer of the meter. Thus, accurate measurement can
be ensured.
5. Pay attention to the direction of flow when installing the me-
ter. An arrow on the meter body indicates the direction of
flow.
6. Before installing the water meter check if a clean strainer is
inserted inside the inlet part of the water meter.
7. During installation it is important to check that the inside of
the couplings/unions are clean, intact and correctly positi-
oned seals/gaskets are used.
8. In order to prevent unauthorized manipulation of the water
meter the couplings/unions can be secured by means of a
wire and seals against tampering.
9. Excessive force when tightening the couplings/unions of the
meter must be avoided in order to prevent damage being
caused to the housing of the meter.
10. In order to guarantee correct measurement, it is very impor-
tant to ensure that no air can enter the water meter or that
the pipeline is allowed to run dry.
11. With many installations water pipelines serve as earthing for
electrical systems. Depending on the actual application an
electrical bypass of the water meter is to be ensured.
12. The meter should be protected against mechanical jolts or
vibration, which could be present in the installation place.
13. The pipeline should be securely fastened before and after the
meter.
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