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2.4 Mounting of Temperature Sensors
Temperature sensors used to measure the flow temperature are usually installed ex-factory,
i.e. integrated into the flow pipe. Installation instructions for sensor used to measure pipe
and return temperature are as followings:
2.4.1 Matched Pairs
The Sensors are color-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.
2.4.2 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.
2.4.3 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.
