Bimetallic thermometer protecting tube length including the teeth length?

The bimetallic thermometer works by thermal element is composed of two layers of linear expansion coefficient difference relatively large pieces of metal welded together, one end of the element as the fixed end, the other end to free end. When the temperature changes, because the bimetallic strip of material is different, linear expansion coefficient of relatively large differences, and produce different expansion and contraction, leading to the curving deformation of bimetallic strip, equipped with actuator (at the free end Dial pointer and temperature) So that it can directly show the temperature value. When we were in the use of bimetallic thermometer, often with a bimetallic thermometer protection tube, sometimes for the sake of easy installation and removal of, sometimes it is in order to in certain circumstances ( When the pressure inside the measured medium is greater than 40 kg, may cause the heat tube and spot welding with the teeth from falling out) The need. The bimetallic thermometer protecting tube length containing the length of the teeth? In fact about this problem, we can, for example, you need to the heat pipe length is 50 mm, for example, then you can say & other; Heat pipe length is not even the teeth of 50 mm & throughout; 。 The same, for example, if using a 1/4 & quot; The NPT screw teeth ( The teeth length is 14 mm) , then can be expressed as & other; Heat pipe length teeth 64 mm & throughout; 。