For the installation of bimetal thermometer, attention should be paid to the accuracy of temperature measurement, safety and reliability, and convenient maintenance. It does not affect the operation and production operation of the equipment. To meet the above requirements, pay attention to the following when selecting the installation location and insertion depth of the thermal resistor. What time is it:
(1) In order to ensure sufficient heat exchange between the measuring end of the thermal resistance and the measured medium, the position of the measuring point should be reasonably selected to avoid installing thermal resistance near the dead angle of the valve, elbow and pipeline and equipment. Bimetal thermometers (2) Thermal resistances with protective sleeves have heat transfer and heat loss. To reduce measurement errors, thermocouples and RTDs should have sufficient insertion depth:
a. For the thermal resistance of the fluid temperature in the center of the pipe, the measuring end should normally be inserted into the center of the pipe (vertical or inclined installation). If the diameter of the pipe of the fluid to be tested is 200 mm, the insertion depth of the RTD should be 100 mm;
b. For temperature measurement of high temperature and high pressure and high speed fluid (such as main steam temperature), in order to reduce the resistance of the protective sleeve to the fluid and prevent the protective sleeve from breaking under the action of the fluid, the protective tube may be inserted in a shallow insertion manner or a hot sleeve type. Thermal resistance. The shallow insertion type thermal resistance protection sleeve has a depth of not less than 75 mm inserted into the main steam pipe; the standard insertion depth of the hot sleeve type thermal resistance is 100 mm;
c. If it is necessary to measure the temperature of the flue gas in the flue, even though the flue diameter is 4 m, the thermal resistance insertion depth is 1 m;
d. When measuring the insertion depth of the original more than 1m, it should be installed as perpendicular as possible, or add the support frame and protective sleeve.
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