Top thermocouple installed correctly

Top thermocouple installed correctly

top thermocouple is suitable for power plant boiler furnace top and other places of long-distance, high pressure measurement. How to correctly install thermocouple?

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, 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.

3, including protective 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 insertion depth.

4, 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 of 100 mm.

5, 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 break under the action of a fluid, can take protecting tube shallow inserted way 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.

6, such as the need to measure is the temperature of flue gas, although the flue is 4 m in diameter, the thermocouple or heat resistance insertion depth of 1 m.