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Temperature Sensor for Contactless Temperature Measurement
Comparative Measurement
1 Measure and make a note of the temperature of the object with the help of a thermocouple or another tem-
perature measuring device which makes contact with the object.
2 Adjust the wenglor temperature sensor so that it’s aligned to the object. The object must entirely fill out the
sensor’s field of vision.
3 Set the emission factor as described in “7.15. EF (adjust emission factor)” on page 24.
Heat Up to a Known Value
1 Heat up the object (or a specimen of the object’s material) to a known temperature. The sensor and the air
surrounding the specimen must have the same temperature.
2 Adjust the wenglor temperature sensor so that it’s aligned to the object. The object must entirely fill out the
sensor’s field of vision.
3 Set the emission factor so that the temperature measured in step 1 is displayed.
Mask the Object using a Material with a Known Value
1 This method is suitable for objects with temperatures of less than 260° C.
2 Cover the object or a specimen of the object’s material using masking tape with a known emission factor.
Wait long enough for the temperature of the masking tape to adjust to the temperature of the object.
3 Set the emission factor at the sensor to the known value of the masking tape. Measure the temperature of
the masking tape (surface “A” in the figure below) with the temperature sensor. Make sure that the measured
area entirely fills out the sensor’s field of vision.
Surface “A”
Surface “B”
4 Adjust the wenglor temperature sensor so that it’s aligned to an uncovered area on the object (surface “B” in
the figure). Make sure that the measured area entirely fills out the sensor’s field of vision. This surface should
be as close as possible to the area covered with masking tape.
5 Set the emission factor so that the temperature measured in step 3 is displayed.
Paint the Object
1 Paint part of the object (or a specimen of the object’s material) using a black paint with a known emission
factor, and allow the paint to dry.
2 Set the emission factor at the sensor to the known value of the paint. Measure the temperature of the painted
part of the object (surface “A” in the figure above) with the sensor. Make sure that the measured area entirely
fills out the sensor’s field of vision.
3 Adjust the wenglor temperature sensor so that it’s aligned to an unpainted area on the object.
4 Set the emission factor so that the temperature measured in step 2 is displayed.
