How much is the platinum rhodium thermocouple standard accidentally wire diameter

Platinum-rhodium thermocouple is very extensive application in the metallurgical smelting, but many manufacturers to cut corners, will put the wire diameter of the dial, to fool the purchaser, because, there are a lot of buyers is no knowledge about this, they were measured by the price, sometimes we convinced them to explain, the purchaser thought we must grab this list, on the contrary the more they want at a low price as the goal of purchasing, usually gb wire is 0. 5毫米,±0。 015, the national standard S dividing platinum-rhodium thermocouple simple introduction,

but true to their wire might be only 0. 4MM。 Some still insufficient, imagine the platinum-rhodium thermocouple wire in ultra-low prices there is great in the article, and what people who do not understand the platinum-rhodium wires, will think that to make cheaper, platinum rhodium thermocouple anode ( SP） Material chemical composition to platinum rhodium, which containing rhodium is 10%, platinum-based is 90%, the cathode ( SN) For pure platinum and platinum rhodium thermocouple long-term maximum temperature of 1300 ℃, the highest short-term using temperature is 1600 ℃. Platinum rhodium thermocouple in the thermocouple series has the highest accuracy, stability, best measure [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 s dividing thermocouple with excellent comprehensive performance, in line with international use scale s platinum-rhodium thermocouple, long as international temperature 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) That s dividing thermocouple still can be used to approximate the international scale. Single platinum-rhodium thermocouple deficiency is thermoelectric potential, thermoelectric potential rate is small, low sensitive to read, mechanical strength under high temperature to drop, is sensitive to pollution, precious metal materials is expensive, and one-time investment is larger. S platinum-rhodium thermocouple is also called single platinum-rhodium thermocouple, its index number is S type dividing, mainly measuring the temperature of 0 ~ 1600 ℃ medium, is one of the precious metal thermocouple category, normally used in the coking plant, steel mill, high temperature heat treatment using occasions. Single platinum-rhodium thermocouple under normal use for a long time when the temperature is 800 ~ 1300 ℃ or so the precision of the measurement, the highest in 800 ℃ temperature measurement accuracy is not high, but the long-term use of temperature above 1300 ℃ can easily damage the thermocouple, so select the correct index number of thermocouple temperature measurement accuracy is the important factor.