For the installation of bimetal thermometers, attention should be paid to the accuracy of temperature measurement, safety and ease of maintenance, and does not affect equipment operation and production operations. To meet the above requirements, it is necessary to pay attention to the installation location and insertion depth of the thermal resistance. The following points:
(1) In order to allow sufficient heat exchange between the measuring end of the thermal resistance and the measured medium, the location of the measuring point should be reasonably selected, and the installation of thermal resistance near the dead angle of the valve, elbow, pipe and equipment should be avoided as much as possible.
Bimetallic thermometer
(2) The thermal resistance with protection sleeve has heat transfer and heat loss. In order to reduce the measurement error, the thermocouple and thermal resistance should have enough insertion depth:
a. For measuring the thermal resistance of the fluid temperature in the center of the pipe, the measuring end should generally be inserted into the center of the pipe (vertically or obliquely). If the pipe diameter of the fluid to be measured is 200 mm, the insertion depth of the thermal resistance should be 100 mm;
b. For the temperature measurement of high temperature, 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 protection tube can be inserted in a shallow insertion manner or a hot sleeve type can be adopted. Thermal resistance. Shallow plug-in thermal resistance protection sleeve, the depth of its insertion into the main steam pipe should not be less than 75mm; standard insertion depth of hot-set thermal resistance is 100mm;
c. If it is necessary to measure the temperature of the flue gas in the flue, although the flue diameter is 4m, the insertion depth of the thermal resistance can be 1 m;
d. When measuring the depth of insertion of the original piece exceeds 1m, it shall be installed as vertically as possible, or be equipped with support frames and protective sleeves.
Use maintenance1. During the storage, installation, use and transportation of WSS series bimetal thermometers, collision protection tubes should be avoided as far as possible. Do not bend or deform the protection tube. Do not twist the meter housing during installation.
2. The meter should work normally within the ambient temperature of -30°C～80°C.
3, the temperature of the instrument often works best in the scale range of 1/2 to 3/4.
4. The length of the bimetal thermometer protection tube immersed in the measured medium must be greater than the length of the temperature sensing element. Typically, the length of the bimetal thermometer protection tube is greater than 100mm, and the immersion length of the 0-50°C range is greater than 150mm to ensure the accuracy of the measurement.
5, all kinds of bimetal thermometers should not be used to measure the temperature of the medium in the open container, live contact thermometers should not be used in the control loop of the occasion where the work vibration.
6. In the storage, use, installation and transportation of bimetal thermometers, collision protection tubes should be avoided. Do not bend the protection tube and use it as a wrench.
7. The thermometer should be tested regularly under normal use
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