In production, due to differences in the object being measured, environmental conditions, and measurement requirements, the installation methods and measures for thermocouples and resistance thermometers also vary. Many factors need to be considered, but in principle, the installation should be considered from three aspects: accuracy of temperature measurement, safety, and ease of maintenance.
To prevent damage to the temperature sensing element, sufficient mechanical strength should be ensured. To protect the sensing element from wear, a protective shield or tube should be added. To ensure safety and reliability, the installation method of the temperature sensing element should be determined according to the specific situation (such as the temperature and pressure of the medium being measured, the length of the temperature sensing element, and its installation position and form). The following are just a few examples to illustrate:
All temperature sensing elements installed under pressure must be ensured to be airtight. Thermocouples operating at high temperatures should generally be installed vertically to prevent deformation of the protective tube at high temperatures. If horizontal installation is necessary, the length should not be too long, and a support bracket should be used to protect the thermocouple. If the temperature sensing element is installed in a pipeline with a high flow rate, it should be installed at an angle. To prevent excessive erosion of the temperature sensing element, it is best to install it at a bend in the pipeline. When the medium pressure exceeds 10 MPa, a protective sheath must be added to the measuring element. The installation location of the thermocouple/resistance thermometer should also consider sufficient space and access for disassembly, maintenance, and calibration. Thermocouples and resistance thermometers with long protective tubes should be easy to disassemble and reassemble.
