Matched Pairs
The Sensors are colour-coded. The one marked with a red sign is to be
installed in the flow pipe normally within the sensor pocket; the other marked
with a blue sign is to be installed in the return pipe.
The two temperature sensors are a matched pair and must not be separated,
so the sensors must be replaced in pairs. The connecting cables may not be
buckled, extended or shortened.
The standard cable length according to EN1434 or OIML R75 is 1.5m and
must not be changed. If the length has to be changed due to restriction of
installation environment, the meter shall be specially dealt within the factory.
Install Position
The end of the sensors must extend in any case as far as the center of the
pipe cross-section. Installation of the temperature sensors should be
preferably symmetrical and direct installation. Do not remove the flow sensor
if already mounted in the flow sensor.
Temperature sensors are to be installed in the area where water temperature
is relatively stable. The installation conditions for the two sensors shall be
identical. Sensors shall not be installed in the high convex segment of the
pipe. Temperature sensors typically can be installed within Tee pipe, ball valve
or sensor pocket.
Sealing
Temperature sensors and screw connections must be sealed against
manipulation, and the seal may not be damaged.
Attach the O-ring for the installation aid, and insert the O-ring into the
installation point according to with a slight circular motion.
Insert the temperature sensor into the installation point and screw it in tightly
until the dead stop of the seal. Secure the sensor after installation against
unauthorized removal with appropriate sealing.
Generally, the seals have been installed on the meter before delivery from
factory.
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