Sensus PolluStat E Installation And Operating Instructions Manual - page 4
Heating / Cooling meter PolluStat E
Installation and operating instructions
M H 4110 INT PolluStat E, page 4
4.1 Flow sensor
Applicable standards: EN 1434-6
Standard installation of the flow sensor is in the
heating return pipe i.e. the colder line. If the flow
sensor is to be installed in the heating supply pipe
i.e. the warmer line, the integrator PolluStat EX is
to be used (X means that the integrator has been
adjusted for flow sensors in the warmer line).
An arrow on the body shows the flow
direction.
The maximum operating pressure and
the maximum operating temperature must not be
exceeded.
It is absolutely advisable to install a dirt trap
before the flow sensor or at another suitable point
of the heating or chilling circuit as well as shut-off
valves before and after the flow sensor (in order to
avoid having to empty the pipeline if the meter is
to be exchanged). During initial installation a spool
piece is installed instead of the flow sensor and
the pipe system is thoroughly flushed. Then close
the shut-off valves, remove the spool piece, clean
the sealing surfaces and install the flow sensor
using new gaskets. Take care not to reduce the
pipe diameter by bad positioning of the gaskets,
particularly if flanged versions are installed.
In areas with thermal layering (e.g. after the
junction of two pipes with different temperatures)
a straight pipe of 10 x DN in front of the flow
sensor is recommended.
Special direction for horizontal installation of
meters of DN 50 to DN 100:
Both ultrasonic transducers in the flow sensor
have to be in horizontal position. For this reason
the PolluStat E has to be installed with the
integrator turned upwards.
In case of removed and separately mounted
integrator this is valid accordingly.
Examples of installation in heating systems:
Fig. 1: Measurement after admixing
Fig. 2: Measurement in injection system
Fig. 3: Measurement with overflow valve