Thermocouple installation precautions
Hot sleeve thermocouple installation precautions?
Thermocouple thermocouple is mainly used thermal protection tube, and the galvanic core can be quickly separated from the way, the user can heat sets of welding or screw fixed on the main device, and then the thermocouple can be screwed into the jobs.
Its advantage is to improve the working pressure and service life of the protective tube, and to facilitate the maintenance or replacement of thermocouple, the current structure is widely used. Heat protection tube with a special process of deep blind hole processing technology, the end of the wall thickness uniform and no welding, that is, there is no material due to welding stress growth of the material, so that the heat sets have a high mechanical strength and resistance Corrosion. Thermocouple thermocouple according to the use of working pressure, temperature and flow rate of different, with several corresponding structure and installation, the user can choose according to the use of freedom. At the same time, the product installed on the transmitter, not only can save the compensation wire, and the temperature transmitter output 4 ~ 20mA standard signal, enhanced anti-jamming capability, so have excellent performance, in the industry have a wide range application. But the installation time there are some more details of the place, if a little attention, then the life of the thermocouple and measurement accuracy is very favorable. The installation of thermocouple and thermal resistance should pay attention to the accuracy of temperature measurement, safety and testing can be easy to operate, and does not affect the operation of equipment and production operations to meet the above requirements, the choice of thermocouple and thermal resistance of the installation site and Insert the depth to note the following:
1, in order to thermocouple and thermal resistance of the measuring end and the measured medium between the full heat exchange, should be a reasonable choice of measuring point position, try to avoid the valve, elbow and pipe and equipment near the corner of the installation of thermocouple or Thermal resistance.
2, with a protective casing with heat and heat loss, in order to reduce the measurement error, thermocouple and thermal resistance should have sufficient insertion depth:
(1) For thermocouples that measure the temperature of the center of the pipe, it is generally necessary to insert the measuring end into the center of the pipe (vertical or tilted). If the pipe diameter of the fluid to be measured is 200 mm, the thermocouple or thermal resistance Insertion depth should be selected 100 mm;
(2) hot sets of thermocouples for high temperature and high pressure and high temperature fluid temperature measurement (such as the main steam temperature), in order to reduce the protective sleeve on the resistance of the fluid and prevent the protective sleeve in the fluid under the action of fracture, Or the use of thermocouple thermocouple. Light plug thermocouple protection casing, the insertion of the main steam pipe depth should not be less than 75mm; thermocouple thermocouple standard insertion depth of 100mm;
(3) If you need to measure the temperature of the flue gas flue, although the flue diameter of 4m, thermocouple or thermal resistance can be inserted into the depth of 1m.
(4) When the thermocouple measuring the original insertion depth of more than 1m, should be installed as far as possible, or the installation of support and protective casing.
