What are the similarities of S type and R type thermocouple? What's the difference? Release date: 2019 05 - 06 viewed: zero

What are the similarities of S type and R type thermocouple? What's the difference? Here are the instrument huashi thrilled everybody to study summarized a, ( S type thermocouple) Platinum rhodium - 10 Platinum thermocouple 1. Introduction: ( S type thermocouple) Platinum rhodium - 10 Platinum thermocouple is precious metal thermocouple, accidentally wire diameter of 0. 5 mm, margin of error - 0. 015 mm, the anode ( SP） In the name of the chemical composition of platinum rhodium, contain the rhodium is 10%, platinum-based is 90%, the cathode ( SN) For pure platinum, commonly known as single platinum-rhodium thermocouple. The thermocouple zui long-term high temperature of 1300 ℃, short-term zui high temperature of 1600 ℃. 2. Features: S type thermocouple in the thermocouple series has high accuracy zui, stability good zui, measure your area wide, long service life, etc. Its physical and chemical performance is good, the thermoelectric potential stability and oxidation resistance at high temperature performance is good, suitable for oxidizing and inert atmosphere. Because of S type thermocouple has excellent comprehensive performance, in line with the international use of S type thermocouple temperature scale, has for a long time as an international scale interpolation instruments, 'ITS - Although 90 'provisions will not be as an international scale in check instruments, but the international advisory committee (temperature 有条件现金转移支付) S type thermocouple can still be used for approximate to realize international temperature scale. 3. Weakness: the shortage of the S type thermocouple thermoelectric potential, thermoelectric potential is small, low sensitivity and high temperature mechanical strength decreased, pollution is very sensitive and precious metal material is expensive, so it's bigger than disposable investment. Second, ( R type thermocouple) Platinum rhodium - 13 Platinum thermocouple 1. Introduction: platinum rhodium - 13 Platinum thermocouple ( R type thermocouple) For precious metals thermocouple. Accidentally wire diameter provision of 0. 5 mm, allowable deviation - 0. The positive (015 mm, RP) In the name of the chemical composition of platinum rhodium, contain the rhodium is 13%, platinum-based is 87%, the cathode ( RN） For the pure platinum, long-term zui high temperature of 1300 ℃, short-term zui high temperature of 1600 ℃. 2. Features: R type thermocouple has the highest accuracy in the thermocouple series, has a good stability, wide temperature range, long life and other advantages. Its physical and chemical performance is good, thermoelectric potential stability, high temperature oxidation resistance performance is good, suitable for oxidation and inert atmosphere. Due to the comprehensive performance of r type thermocouple and s type thermocouple, in addition to the application of temperature measurement on imported equipment, domestic temperature has been difficult to promote. Measurements are rarely used. Between 1967 and 1971, the British NPL, NBS and Canada NRC three research institutions to carry on the cooperation study, the results showed that the stability and repeatability of the r type thermocouple is better than that of s type thermocouple, China has not yet been in this field were studied. 3. Faults: R type thermocouple deficiency is thermoelectric potential, thermoelectric potential rate is small, low sensitivity and mechanical strength under high temperature to drop, is sensitive to pollution, precious metal materials is expensive, and one-time investment is larger.