How to classify between grounding type and non-grounding type thermocouple?
As we all know, the thermocouple hot end in the form of insulation type, grounding type and exposed type, so we will introduce what is the grounding type thermocouple, and the difference between grounding type thermocouple and non-grounding type thermocouple.
Grounded type thermocouple is the shell type, the working end is welded to the top of the protection tube, so and the shell is connected, also connected to the equipment shell called grounded type. Grounded type thermocouple thermal hysteresis time constant is a small, fast response time. Insulation type working end does not touch the protection tube, and there are certain insulation requirements, the time constant when measuring is greater than the grounding type, and the response sensitivity is lower than the grounding type. There is no strict difference in the usage and requirements for secondary instruments. If you consider the impact of equipment leakage on the instrument, the instrument needs to be strictly grounded. From the safety point of view, try to use insulated sensors. Unless the measurement sensitivity is very high, especially the requirement for fast response temperature, then use the grounded type.
Grounding type thermocouple and non-grounding type thermocouple comparison.
1, non-grounded type thermocouple internal structure: insulation between the protective sleeve and thermocouple
Benefits: temperature measurement contact and protection tube completely insulated; response is worse than grounded type, but less susceptible to interference; usually use this type.
2, the internal structure of the grounding type thermocouple: between the protective sleeve and thermocouple conductive
Benefits: grounding type thermocouple connected to the front of the protection tube of the temperature measurement contact; response is fast, but susceptible to interference; high yield, low-cost type.
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