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Precious metal thermocouple _ instrument maintenance method

by:JVTIA     2020-10-28
Precious metal thermocouple is a kind of common measuring instruments, in many areas has a certain application. Precious metal thermocouple in use is also there will be some malfunction and wear, so this time for the precious metal thermocouple maintenance is necessary. Precious metal thermocouple maintenance method is as follows: if you want to precious metals thermocouple used longer can use acid oxidation ability, high temperature to remove organic matter on the surface of the precious metal platinum rhodium thermocouple and other impurities can be acid dissolution. Will be high temperature metal platinum-rhodium thermocouple plate into a circle about 80 mm in diameter in the beaker, import 30%, 50% ( According to the volume ratio) Chemical pure dilute hydrochloric acid ( Or dilute nitric acid) One hour, take out into a beaker, thoroughly with distilled water for a few times to remove the acid. The purpose of pickling was part cleaning electrode surface oxide and organic materials. Used the high temperature of precious metals platinum rhodium thermocouple sodium borate cleaning after acid pickling. First high temperature metal platinum-rhodium thermocouple electrode hangs on the platinum wire annealing on the ark, and then to adjust current, make very hot thermocouple to 1100 ° c. Use block sodium borate hit a hot spot, who make the boric acid solution down along the electrode, slowly after cleaning to reduce electric current, then cut off power supply, take the feeling as a 80 mm diameter circle into a beaker, several times with distilled water to boil, completely precipitate boric acid salt. Sodium borate clear purpose is mainly appeal insoluble in hydrochloric acid and metal oxide. Because of sodium borate in high temperature melting and attached to the high temperature metal platinum-rhodium thermocouple hot metal impurity on the electrode and metal oxide generated boron glass solutions, suitable hot electrode outflow, reach the purpose of clearing the outer electrode contamination. Annealing is to eliminate internal stress in the electrode, improve the high temperature metal platinum-rhodium thermocouple phase to improve stability of precious metals platinum rhodium thermocouple. Through proper annealing temperature and annealing time, can achieve the purpose of prayer. Annealing generally has two methods:, electric annealing furnace annealing. For the sake of our precious metal thermocouple service life and save our spending on components, in view of the thermocouple and maintenance is very heavy, even if some trouble, we are still in accordance with the requirements of operation. Precious metal thermocouple maintenance purpose is in order to increase its service life and reduce the degree of its damage, the above method is to increase the service life of the precious metal thermocouple and can reduce wear and tear.
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