Data Sheet for Product

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Siem ens Immersion temperature sensors QAE21… CE1N1781en
Building Technologies 2018-05-28
Mounting and installation notes
Depending on use, the sensor should be located as follows:
· For flow temperature control:
In the heating flow:
– Directly after the pump if the pump is located in the flow
– 1.5 to 2 m after the mixing valve if the pump is located in the return
· For return temperature limitation:
In the return at a location where the temperature can be correctly acquired
The sensor should be installed in an elbow such that the immersion rod or the protec-
tion pocket faces the direction of flow. The water must be well mixed where the tem-
perature is acquired. This is downstream from the pump or, if the pump is mounted in
the return, at least 1.5 m after the mixing point.
The sensor should be mounted such that the cable does not enter from the top.
With all types of sensors, the immersion length must be a minimum of 60 mm!
The sensor must not be covered by lagging.
To fit the sensor, a threaded fitting or T-piece G ½ must be welded into the pipe.
permitted: not permitted:
1781Z02
min.
60 mm
1781Z01
a b
c d
G ?
· For sensors with non-sealing threaded nipples G ½, sealing means must be used
with the threaded connection (e.g. hemp, Teflon tape or similar)
· Tighten compression fitting AQE2102 on the sensor's immersion rod
– When tightening for the first time:
Turn the nut about 1 ½ turns until strong resistance is felt. Then, slightly loosen
the nut again and retighten ¼ turn
– For premounted compression fittings or repeated fitting:
Screw the nut on until finger-tight. Then, tighten with a spanner ¼ turn for the final
fit
Mounting Instructions are printed on the packaging.
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Mounting positions
Mounting
Note!
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