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ManualsBrandsSiemens ManualsSensors TemperatureClamp-on Temperature Sensor QAD26.220
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Siemens Clamp-on Temperature Sensor CM1N1802en
Building Technologies 2017-12-01
Technical design
The sensing element is a nickel thin-film element having a basic resistance of
1000 Ω at 0 °C. The resistance of the element increases in function of the tempera-
ture at a rate of about 5 Ω per Kelvin.
R R
esistance in Ohm
ϑ Temperature in degree Celsius
Mechanical design
Hermetically sealed plastic casing, with resilient lateral wings to facilitate position-
ing on the pipe. The casing accommodates the sensing element (LG-Ni1000 Ohm
at 0 °C) with a ready connected two-wire cable. Sensing element and cable entry
are encapsulated. The casing has a resilient top to compensate for thermal expan-
sion resulting from temperature changes.
The cable is two meters long and provided with terminating sleeves at its end. It
features tension relief.
The QAD26.220 is fitted to the pipe with the help of the heat-resistant plastic
clamping band supplied with the sensor.
The sensor can be fitted to pipes having a diameter from 10 to 50 mm.
Mounting notes
The clamp–on temperature sensor can be mounted either under the lagging or on
a piece of unlagged pipe. When placed under the lagging, the response time is
shorter. When used in the field of refrigeration, the sensor must always be fitted
under the pipe’s lagging.
The pipe’s surface where the sensor is placed must be bare. When fitting the sen-
sor, press it firmly on the pipe and tighten the clamping band.
The QAD26.220 is supplied complete with mounting instructions.
Characteristic of the
sensing element
Legend