Notch probe

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Temperature sensors for electric motor stator slot

Wired temperature sensors with heat shrinkable insulation. These temperature sensors are distinguished by their high electrical resistance and are most often used to measure the temperature in the slot of the stator of the electric motor.

Basic parameters of temperature sensors isolated by heat-shrinkable sleeve:

Detection element: Pt 100, Pt 1000, Ni 1000, NTC, PTC, KTY, other as requested
Operating temperature range: temperature class H -20 ° C to 180 ° C
Housing: Sklotextit frame covered with a heat-shrinkable sleeve
Connection: 2 wire, 3 wire or 4 wire

The parameters and design of the sensor can be adjusted on request. Measuring element wound over the entire length of the probe or fixed measuring point for mounting in the slots of electric motors and transformers.


resistant to stresses such as shock, pressure, vibrations and particularly resistant to commercially available impregnating agents, curing and drying processes.

Use Case

As an alternative to resistance thermometers with two-wire wound slots, chip slot resistance thermometers (Pt100 - Pt1000 ohms) have been established. The probe chip offered by GUILCOR is mainly intended for use in the notches of the stator winding of electric machines. For this reason, all variants are also available in an Ex certified version according to IECEx and ATEX. In principle, these thermometers can also be used for all measurement tasks on surfaces, grooves or other measurement points that are difficult to reach.

Principle of construction / operation

In these groove resistance thermometers, instead of a two-wire wound platinum wire, a thin-film platinum measurement resistance is used. The temperature-sensitive length is shortened to the active measurement length of the thin-film sensor (spot measurement). This is quite sufficient for many measurement objectives, since the requirements mainly concern the design (groove) and not the active measurement length.

Certificate for ATEX probe available on request

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