Stainless Steel K Type Thermocouple

A: 1. Thickness of thermocouple protection tube: It depends on the temperature requirements of the site. The minimum thickness cannot be less than 2mm.
2. The thermocouple protection tube has some strict requirements during the production process: first, the head. There are two types of heads: one is to use a lathe to perform self-melting sealing method under high-speed operation. The advantage is that the thermocouple and the protective tube are made of the same material, which can be used in terms of temperature resistance and use. The disadvantage is that some pipes with poor sealing may have pores and are prone to air or water leakage. If used in gas or harmful liquids, the consequences will be disastrous. Regardless of the method used, a pressure test should be performed to prevent the formation of air bubbles.
3. Thermocouple thread welding requirements: Some thermocouples need to have threads. The thread material is usually 1Cr18Ni9Ti or 304 or the same thread material as the protective tube. Some manufacturers use casting to produce threads. A more formal approach is to use materials of the same texture. There must be welding stations at both ends of the thread to facilitate argon arc welding. Both ends of the thread must be welded firmly.
4. Some manufacturers do not allow polishing of the appearance of the stainless steel k type thermocouple protection tube. Polishing only removes a protective outer surface layer of the tube, making it bright and beautiful, but not practical. Now, due to technological advancement, stainless steel pipes can be finished with a smooth finish during the production process. During production, only the surface needs to be specially treated and a matte layer is applied on it. The appearance looks high-end without any loss of quality.
5. Protect pipes from residual dirt and metal debris.
6. There should be no obvious corrosion, dents or scratches on the outside of the protective tube.
7. The polarity markings in the junction box are correct.
8. All components should be assembled correctly, connected reliably, and parts should not be damaged.
To sum up, by checking the appearance of the thermocouple based on the above points, we can intuitively judge the quality of the thermocouple.