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OM-222 166 Page 22
4-16. Using Contact Thermocouples
The welded thermocouples discussed previously can be used for preheating or stress relieving. As an alternative, in preheating applications, a contact
temperature sensor* can be used. This eliminates the need to weld thermocouples and the sensor can be moved during the preheat process to check
temperatures at other locations on the joint.
. Removing the contact probe will display a short duration of heat drop on the temperature recorder, if used.
The contact temperature sensor can be plugged into the thermocouple extension cable or a Type K 25 ft. armored extension cable* can be used. One of
these extensions is required for each sensor.
In preheating applications, the thermocouple must be placed under the induction coil. Temperatures at the weld joint can be checked with temperature
sensitive crayons to verify the preheat temperature.
Welded thermocouples are normally used in stress relieving applications due to their accuracy.
*See product literature for item part number.
804 321-A
4-17. Placing Temperature Probe
1 Blanket
2 Temperature Probe
Place temperature probe between
blanket and metal material. The
probe must be in contact with the
material being heated. The tip of the
probe should be positioned in the
approximate center of the blanket
anywhere along the blanket length.
1
2