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 water meter must be avoided in order to prevent dama-
ge being caused to the housing of the water meter.
10. In order to guarantee correct measurement, it is very im-
portant 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 water meter should be protected against mechanical jolts
or vibration, which could be present in the installation place.
13. The pipeline should be securely fastened upstream and
downstream of the water meter.
14. Measures should be taken, so that the water meter is not
damaged by hydraulic influences such as, pressure shocks
and cavitations. Additionally it should be guaranteed that
the water meter is not damaged due to frozen water being
encountered.
15. Signal (Interface GWFcoder®) wiring should never be laid
together with mains power lines and must be indepen-
dently protected. The distance between signal (Interface
GWFcoder®) and mains power line must be a min. di-
stance of 2 Inch.
4. Commissioning
During commissioning and after every time the water meter
has run dry, shut-off valves must be opened slowly in order to
avoid pressure shocks on the water meter.
5. Maintenance and service
Water meters are maintenance free under normal operating
conditions. They excel in that they have a long life span. The
life span essentially depends on the water quality and on the
conditions and capacity of flow. We recommend however to ex-
amine the following points periodically.
1. Before working on the installation, it is to be examined
whether the pressure is relieved in the pipeline.
2. When the water supply is closed, all the pointers of the re-
gister should stopp. When the water supply/inlet is slowly
opened the pointers should begin to turn-over evenly and
slowly.
3. If the supply network is subject to dirty conditions, it is re-
commended, to clean the strainer on the inlet of the water
meter on a regular basis.
4. The stamp on the seal should be verified if it is intact.
5. It should be verified that all shut-off valves upstream and
downstream of the water meters are fully opened, and if
they can be closed and there are no leaks present.
6. The water meter and pipe work of the installation should
be checked for leaks.
7. Check to see that the environment, in which the water me-
ter is installed, is devoid of water, where dripping water
onto the register could lead to water ingress.
8. Pay attention that the water meter connections
are securely attached and that all pipelines are
undamaged and intact.
9. It should be verified that the ambient tempera-
ture lies within the admissible temperature range of the
water meter.
6. Disassembly and disposal
It should be ensured that the water meters are disposed of in
a recycling just manner. The local and national regulations for
environmental protection are to be considered.
7. Safety guidelines
1. The water meters should always be handled only on the
water meter housing and should not be carried by either
the lid or communication cable.
2. The devices may only be used for the intended purpose.
GWF MessSysteme AG guarantees in the context of the
general trading conditions the quality of its products. The
responsibility for the correct installation as well as profes-
sional handling falls within the scope and receipt of goods
on the owner or operator.
8. Interface GWFcoder®
Unico2coder MP, MTK3coder MP, MTW3coder MP
Multi Protocol Interface
M-Bus (MP) Wired M-Bus acc. EN 13757
(wire length up to 3280 feet)
The polarity of the connecting wires makes no difference (polartity
insensitive)
ECO (MP) Low power interface
(wire length up to 50 feet)
The polarity of the connecting wires must be observed
Unico2coder MP, MTK3coder MP, MTW3coder MP
SUS Sensus protocol (3-wires)
The polarity of the connecting wires must be observed
9. Radio module
Unico2coder MP, MTK3coder MP, MTW3coder MP
Frequency 915 MHz: max. 20 dBm (100 mW)
sheet -2 of 2 / A2
TBU
in process
Name
Date
Modification
Index
Index
Part no.
GWF MessSysteme AG, CH-6002 Luzern
swiss.smart.simple.
Approved
Checked
Name
Date
Material
Drawn
Doc no.
Scale
1:1
Description
Weight
Volume
Color
1514.83 g
143174
Unico USA Massbilder
29.05.2019
512774.67 mm³
Material no.
Elektronic
0a
Confidential
Copyright © GWF MessSysteme AG
All rights strictly reserved. Reproduction or
issue to third parties in any form whatever is
not permitted without written authority of
GWF MessSysteme AG, CH-6002 Luzern
sheet -1 of 2 / A2
TBU
in process
Name
Date
Modification
Index
Index
Part no.
GWF MessSysteme AG, CH-6002 Luzern
swiss.smart.simple.
Approved
Checked
Name
Date
Material
Drawn
Doc no.
Scale
1:1
Description
Weight
Volume
Color
1514.83 g
143174
Unico USA Massbilder
29.05.2019
512774.67 mm³
Material no.
Elektronic
0a
Confidential
Copyright © GWF MessSysteme AG
All rights strictly reserved. Reproduction or
issue to third parties in any form whatever is
not permitted without written authority of
GWF MessSysteme AG, CH-6002 Luzern
