1. Sensor types
Precision-platin sensors type PT1000 (FKP and FRP) are
used for TT1
The arrangement of the sensors is of great importance to
the total efficiency of the regulator. The collector tempera-
ture should be measured in the upper part of the collector.
In stores with integral heat exchanger, the sensor must be
directly mounted in the upper part of the heat exchanger.
When using external heat exchangers, the sensor must be
fixed at the bottom of the store. For individual operation
systems, our product range contains 3 different types of
sensors (sensors for installation in existing immersion slee-
ves, flatscrew sensors or cylindrical clip-on sensors). The
sensor types FK and FR have the same electrical features
and are available in the same models, They only differ in the
connecting cable:
Immersion sensors: in different lengths (immersion
depth) available
FK...60: 60 mm immersion depth, immersion sleeves of
chromium-plated brass
FK...150: 150 mm immersion depth, immersion sleeve of
chromium-plated copper
Important: The sensors must be completely pushed into
the sleeve and the nut must be slightly tightenend.
Cylindrical clip-on sensors: for any pipe diameter; cpl.
with fastening collar; FK...21 or FR...21
Ensure good thermal contact of the sensor with the pipe
work by cleaning the contact area and by applying heat con-
duction paste between sensor and pipe. In order to protect
the sensor cable against outside temperature influences, it
is recommended to insulate the pipe..
Flatscrew sensors: for installation on flat surfaces
FK...9 or FR...9
Ensure good thermal contact. Use conduction paste and in-
sulate the sensors against outside temperature influences.
Indication:
In order to avoid overvoltage damage at the collector (e.g.
by lightening), it is highly recommendend to use the over-
voltage protection RESOL SP1.
FK... : collector sensor
FR... : reference sensor (store sensor)
FK: 1,5 m weather- and temperature resistant silicone cable
for temperatures between -50 °C ... +180 °C, mostly used
for collectors.
FR: 2,5 m PVC cable for tempertures between
-5 °C ... +80 °C, mostly used for stores.
Make sure that all electrical works are carried out according
to the relevant local and IEE-regulations. The sensor cables
carry low voltages and they must not run together in a
cable conduit with cables carrying higher voltages than 50
Volts. When using longer cables or cable conduits, please use
screened cables. The sensor cables can be lengthened up to
100 m, but the cross section must be 1,5 mm² (or 0,75 mm²
up to a cable length of 50m); screened cables should be used
preferably. The sensors must not be in direct contact with
water, please always use immersion sleeves.
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