Slot Resistance Temperature Detectors

The main purpose of slot resistance temperature detectors (RTD’s) is to measure the winding temperature within the iron package of stators or rotors. They generally feature a flat and slimline construction. Slot resistance temperature detectors are made using two methods. In the first version, a platinum resistance wire is bifilar coiled, allowing measurement over a longer stretch of the element. Alternatively, a cheaper alternative features a platinum thin-film measuring resistor (chip), although this allows only a point measurement.


Allmetra manufactures products of the highest quality and mainly offers the bifilar version. Depending on the available space, construction and electrical or mechanical requirements, a range of materials are used. The resistive elements can also be inserted into a hard fabric pad (HGW) and on request, this pad may also be coated with conductive lacquer for electrical protection. The scope of our everyday work also extends to HGW designs and conductive lacquer versions.

A test report in accordance with EN10204 3.1 is available on request for all the sensors in our range, also including, where applicable, an inspection and test plan (IT) or a certificate of compliance in accordance with EN 10204 2.1

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