Manual Integrator Supercal 531 06-06-2011 8
In general, the flow sensor is installed at a place where the temperature of the medium is nearer to
the ambient temperature. In heating systems, this is the return line and in cooling systems, this is
the supply line.
Thus a higher measuring precision and a longer service life of the flow sensor are achieved.
2.4 Temperature sensor
Please be careful when choosing and installing the temperature sensors.
Even the most intelligent integrator is not in a position to level out mistakes made here.
It is recommended to only use type-approved platinum temperature sensors in the versions Pt500
and Pt100. They are twin sensors and can be used in two-wire technology up to a cable length of 3
m. The connection cables may never be separated, extended or shortened.
If a length of more than 3 m is required, we recommend using shielded cables of the same length.
The approval for the integrator Supercal 531 allows the use of two-wire temperature sensors up to
a length of maximum 15 m and of four-wire sensors up to a max. cable length of 50 m.
In low temperature heating system, it is recommended to install the temperature sensor directly
and without protection pocket because of the minimal temperature difference. Thus even the
slightest temperature differences and errors due to heat dissipation can be detected immediately.
In pipes up to DN 150 the temperature sensors are installed directly or with protection pocket so
that the measuring-active part of the sensor tip is placed in the centre of the pipe cross section.
For more detailed information on temperature sensors, we refer you to the Sontex overview of
temperature sensors.
2.4.1 2-Wire-cable sensor
1 / 2 3 / 4
temperature high temperature low
Due to the fact that the exact temperature difference (and not the absolute temperature) is impor-
tant for measuring the heat quantity, it is imperative that both sensor cables are of the same length
(resistance). Ex works, the sensors are paired precisely by computer and may only be used in its
original pairing.
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