There are four types of thermocouple measuring junction constructions :
The grounded thermocouple junction is an integral part of the thermocouple sheath tip.
Advantages:
Disadvantages:
The ungrounded thermocouple junction is electrically insulated and electrically isolated from the outer sheath material. In a dual ungrounded thermocouple, one common junction is electrically insulated from the outside sheath.
Advantages:
Disadvantages:
The exposed thermocouple junction extends beyond the protective metallic sheath.
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Disadvantages:
Isolated thermocouple junctions are used in a dual or triple thermocouple when the junctions are isolated from the outer sheath material as well as from each other.
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Disadvantages:
Reference : gilsoneng.com
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