The advantages of heat set of thermocouple and installation considerations

Heat sleeve type thermocouple protection tube, mainly adopts thermal shell and galvanic core can be quickly separate way, when using, the user can be heat set of welding or thread fixed on the main equipment, and then, the thermocouple screwing in work.

it has the advantage of improving the protection of the pipe pressure of work and service life, and convenient for thermocouple maintenance or replacement, at present this kind of structure has been widely adopted. Hot shell protection tube using special technology of deep blind hole processing technology, end wall thickness even without welding, namely there is no material grain growth because of the welding stress problem, make the heat has high mechanical strength and corrosion resistance. Heat set of thermocouple based on the use of working pressure, temperature and flow rate of different, has several corresponding form of structure and installation, the user can choose according to usage from. At the same time, the product is installed on the transmitter, can not only save the compensating conductor, and the temperature transmitter 4 ~ 20 ma output standard signal, to enhance the anti-interference ability, so have excellent performance, widely used in industry. But the installation when there is some more details, if you pay attention, for the service life of the thermocouple and are favorable to the accuracy of measurement. Of thermocouple and thermal resistance of the installation, should be paid attention to for accurate temperature measurement, safety examination and maintenance is convenient, and does not affect the equipment operation and production operations. To meet the above requirements, in the choice of thermocouple and thermal resistance of the installation site and insertion depth when should pay attention to the following:

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 insert depth 100 mm;

( 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 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;

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