PEF2V02
2017-11-20
9
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Mounting on standard DIN-rail:
Important: It is forbidden to attach the electronic unit directly to a wall if there is a risk that on walls
can be condensed humidity or temperature of a surface of a wall can fall lower than 5 °. In this case, it
is recommended to attach the calculator so that between it and wall surfaces there were an air gap not
less than 5 cm.
Mounting of flow sensor measuring section
Sizes and mounting dimensions of flow sensors are provided in Annex B.
Requirements for flow sensor installation in pipeline:
-
For flow sensors DN15…DN50 no requirements for straight pipeline length in upstream and downstream
directions.
- For flow sensors DN65, DN80 and DN100 necessary straight pipelines lengths are:
upstream straight
pipeline length must be not less 5DN and downstream straight pipeline length must be not less 3DN.
Avoid the flow sensor installation near after the pumps which can cause cavitations.
Flow sensor can be mounted in horizontal, vertical or inclined positions in return or flow.
Necessary
condition in normal working mode: pipeline must be under pressure and fully filled with heat conveying liquid.
The location and position of the flow sensor must be selected in such a way as to reduce the risk of
accumulation of air bubbles in the zone of ultrasonic sensors (Fig. 6.1).
a)
Permissible installation position
b) The installation position is prohibited.
(the
air bubbles may accumulate
)
Fig.6.1.
Mounting Position of the flow sensors qp 3,5 m
3
/h... qp 60 m
3
/h
The direction of the sensor installation (is indicated with the arrow on the label of flow sensor) must match
with the flow direction in pipeline.
The flange gaskets must match with the pipe diameter. During the installation gasket must be exactly
centred with the centre of the pipe cross-section to avoid sticking out gaskets inside the pipe.
6.4. Sealing after installation
The sensor must be sealed according to p.4.2 to ensure that after the installation, it is not possibility of
dismantle, remove or altering the meter without evident damage on the meter or the seal.
Mounting seal:
After installation the case and cover of the electronic unit (see Annex C, fig.C1, pos.3) are sealed with two
hanged seals of heat supplier.
Connection of flow sensor with the pipeline should be sealed in addition.
