Seeking specifications for thermocouple products
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Dear seniors, when I was looking at the specifications for this thermocouple, the information shown was Lxl=300x150, M20x1.5; it’s an insulated type with a armored element of diameter φ6. The electrical connection port is of type M20x1.5 with internal threads. The protective tube used is made of 06Cr18Ni11Ti material, with a diameter of φ20 and a conical shape. The installation thread is of type M27x2, and the insertion depth is 40 mm. I also checked JB/T 5219—91; according to that standard, the total length of the thermocouple should be 300 mm, with an insertion length of 150 mm. The protective tube is connected via fixed threads, and the pitch of these threads should be 1.5 mm, with a diameter of 20 mm. However, the specifications also mention the thread dimensions and insertion depth. As for the electrical connection port, it seems to refer to the wiring terminal at the bottom of the junction box. I’m not quite sure about this.
It comes with a sleeve; the thread on the sleeve to which the thermocouple is screwed has a pitch of 20X1.5, while the thread on the device to which the sleeve is screwed has a pitch of 27X2. In other words, if the thermocouple is damaged, it can be replaced directly, while if the sleeve is intact, there is no need to replace it
This is done to facilitate replacement in the future; M20*1.5 is used for connecting the thermocouple core to the sleeve, while M27*2 is used for connecting the sleeve to the device
It’s the combination of the two items in the image below.