Thermocouple installation need to pay attention to the problem1

Heat set of thermocouple is a kind of common temperature meter, it is mainly used for temperature measurement. Heat set of thermocouple measurement has good stability, high precision application range is very wide. Temperature instrument set of thermocouple problems need attention in installation are also more, for the user and is used to measure the has a very important link, the project is to introduce the specific instrument of temperature set of thermocouple installation problems need attention.

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

2, with a protection casing with 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 100 mm insert depth.

( 2) Heat set of thermocouple temperature measurement for high temperature and high pressure and high velocity ( Such as main steam temperature) , in order to reduce cases of fluid resistance and prevent cases break under the action of a fluid, can adopt the mode of protection tube shallow inserted or use hot set of thermocouple shallow inserted type thermocouple protection tube, its depth into the steam pipe should be no less than 75 mm; Heat set 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 meters in diameter, the thermocouple or heat resistance insertion depth of 1 meter.

( 4) As the hot set of thermocouple measuring the original insert deeper than 1 meter, 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