Do you know how to properly maintain platinum rhodium thermocouple?

Platinum rhodium thermocouple is a kind of temperature measuring instrument with a variety of advantages, in the current market have many old customers. However, users in the use of platinum-rhodium thermocouple will cause certain wear and tear, so what should measures can reduce this kind of circumstance happening?

if you want to reduce this to happen, we must to correct platinum-rhodium thermocouple proper maintenance, can reduce the wear and tear, specific maintenance content is as follows:

1, platinum, rhodium thermocouple pickling

acid pickling to remove some of the other organic matter and its surface impurities, etc. The usual treatment measure is: the first high temperature metal platinum-rhodium thermocouple set in a circle, the general the diameter of the circle about eighty mm, and then, the water in a beaker and pour into 30% 50% ( According to the volume ratio) Chemically pure dilute hydrochloric acid or dilute nitric acid solution soak sixty minutes, then remove it put into a beaker, thoroughly with distilled water for a few times to remove the acid.

2, platinum rhodium thermocouple sodium borate cleaning

after pickling, generally need further treatment. This is to remove the outer electrode in the dirt. Particular way is: the first platinum rhodium thermocouple electrode hangs on the platinum wire annealing on ark, adjust the appropriate current, bringing it up to one thousand one hundred degrees Celsius. The sodium borate with very hot, make its solution down along the electrode, can slow the current decreases, and after cleaning off the power. And then put into a beaker, repeat with distilled water boiling, until the boric acid salting-out.

3, platinum rhodium thermocouple annealing

the main purpose of this operation is to ensure the stability of the platinum rhodium thermocouple, generally by two methods, respectively called electric annealing furnace and annealing. Is the main purpose of annealing can remove the internal stress in the electrode, and make the some changes in the crystalline phase. At the time of operation, should pay attention to grasp the appropriate annealing temperature and annealing time, can achieve good results.

the above content is about the maintenance of platinum-rhodium thermocouple method, users in the use of platinum rhodium thermocouple, and adopt the right maintenance method is very good, can effectively prolong the using time, reduce maintenance costs.