Thermocouple advantages and installation requirements1

Thermocouple product assembly is simple, easy to change, is widely used in industry, electric power, electronics, petroleum, chemical, mining, metallurgy and other fields. The following project is to introduce the specific advantages of thermocouple and installation requirements, hope can help users better application products.

thermocouple advantages

1, high measurement precision. For direct contact with the object being measured, not affected by intermediate medium.

2, wide measuring range. The commonly used thermocouple from 50 ℃ below zero - — 1600 ℃ can be continuous measurement, some special thermocouple minimum measurable to - 269℃( Such as gold iron nickel chrome) , up to 2800 ℃ ( Such as tungsten, rhenium) 。

3, simple structure, easy to use. Thermocouple is usually composed of two different kinds of metal wire, but is not limited by the size and the beginning of, outside has protective casing, which are very convenient.

thermocouple installation requirements

1, in order to make the measurement end of the thermocouple and thermal resistance and had good heat exchange between the measured medium, should be a reasonable choice of observation, try to avoid the valve, elbow and pipe of elements and equipment installed near the thermocouple or heat resistance.

2, with a protection casing thermocouple and thermal resistance of heat transfer and heat loss, in order to reduce the measurement error, thermocouple and thermal resistance should have enough insert depth:

( 1) For thermocouple temperature center fluid, usually should be measuring end is inserted into the pipe center ( Vertical or inclined installation) As the current body of pipe diameter is 200 mm, the thermocouple or heat resistance should choose insert depth 100 mm;

( 2) For high temperature and high pressure and high velocity of temperature measurement, Such as main steam temperature) , in order to reduce cases of fluid resistance and prevent cases under the effect of fluid fracturing, the way protecting tube shallow inserted or use hot thermocouple, shallow inserted type thermocouple protection tube, its depth into the steam pipe should be no less than 75 mm; Heat sets the standard of thermocouple insertion depth is 100 mm;

( 3) If is need to measure the temperature of flue gas, although the flue is 4 m in diameter, the thermocouple or heat resistance insertion depth of 1 m;

( 4) When measuring the original insertion depth of more than 1 m, shall be installed vertically, as far as possible or add racks and protect casing.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor