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How to clean the platinum and rhodium thermocouple

Release date: 2017-07-20 09:41:18 Visits: 795

Platinum and rhodium thermocouple as a typical thermocouple, has now gradually been widely used, but at the same time in the use of the process, we do not forget to maintain Oh! Xiaobian by collecting information, to introduce the platinum and rhodium thermocouple on the maintenance of skills.
1) pickling
The use of acid oxidation capacity, remove the high temperature precious metal platinum and rhodium thermocouple surface of the organic matter and other impurities can be dissolved by acid.
The high-temperature precious metal platinum and rhodium thermocouple disk into a diameter of about 80mm circle placed in a beaker, into 30% -50% (by volume ratio) chemical pure hydrochloric acid (or dilute nitric acid) for one hour, remove and put into the beaker, Drink several times to remove the acid thoroughly. The purpose of pickling is to clean the surface of the electrode part of the organic matter and oxide.
2) sodium borate cleaning
Used high-temperature precious metal platinum and rhodium thermocouple after pickling after sodium borate cleaning. Place the high-temperature noble metal platinum and rhodium thermocouple electrode on the platinum wire on the cabinet, then adjust the current so that the thermocouple burns to 1100 ° C. With the block of sodium borate touch the hot pole, so that boric acid who solution along the electrode flow, after cleaning slowly reduce the current, and finally cut off the power, remove the disc into a diameter of 80 mm into the beaker, boiled several times with distilled water, Thoroughly precipitate borate. The purpose of sodium borate removal is mainly the atmosphere is insoluble in hydrochloric acid metal and oxide. As the sodium borate melting at high temperatures and attached to the high temperature precious metal platinum and rhodium thermocouple thermal electrode on the metal impurities and metal oxides generated boron glass solution, along the hot electrode flow to achieve the purpose of removing the electrode outer dirt.
3) annealing
Annealing is to remove the electrode in the internal stress, improve the high temperature of the precious metal platinum and rhodium thermocouple crystal phase to improve the stability of high temperature precious metal platinum and rhodium thermocouple. Through the appropriate annealing temperature and annealing time, you can achieve the desired purpose. Usually there are two ways to anneal: power annealing, furnace annealing.
Through the above on the platinum and rhodium thermocouple cleaning method of the relevant introduction, we hope to work, learn to help.

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Add: Wuxi City Xinwu District GaoLang East Road 999# Room 506
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