Installation considerations of thermal resistance and heat resistance of the installation requirements are the release date: 2019 - 05 - Read 30 times: 0

Thermal resistance of the installation note 1, thermal resistance should be installed vertically in a horizontal or vertical piping, heat resistance when installation should be protect casing, to facilitate maintenance and replacement. 2, temperature measurement of the pipe, the element length should be in the center of the pipe line ( The protection tube insertion depth should be the half of pipe diameter) 。 3, moving coil temperature table when installation, hole size to fit, install to the beauty is generous. 4, high temperature using high temperature or high temperature compensation cable. 5, according to the different choice of different temperature measuring element. General measure temperature less than 400 ℃ when choosing thermal resistance. 6, reasonable wiring to aesthetics, whose hands pointing to correct. On the thermal resistance of the installation, should pay attention to temperature measuring accurate, safe and reliable and convenient maintenance, and shall not affect the equipment operation and production operations. To meet the above requirements, in the choice of the thermal resistance of the installation site and insertion depth should pay attention to the following: 1, in order to make the measurement end of the 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 and equipment near the corner of installing heat resistance. 2, with a protection casing thermal resistance of heat transfer and heat loss, in order to reduce the measurement error, thermocouple and thermal resistance should have enough insert depth: 1) For thermal resistance 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 thermal resistance should choose insert depth 100 mm; 2) 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 shell heat resistance. Shallow inserted type thermal resistance to protect casing, and its depth into the steam pipe should be no less than 75 mm; Shell hot resistance standard into the depth of 100 mm. 3) If is need to measure the temperature of flue gas, although the flue is 4 m in diameter, thermal resistor insertion depth of 1 m. 4) 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. Thermal resistance is not only widely used in industrial temperature measurement, and is made into standard benchmark instrument. But due to his temperature range makes his application by certain restrictions, thermal resistance temperature measurement principle is based on a conductor or semiconductor resistance changes with the change of temperature characteristics. Its many advantages, can also remote transmission signal, high sensitivity, strong stability, compatibility and accuracy are better, but you need to power, can't instantaneous measured the change in temperature. Industrial heat resistance generally adopts Pt100, Pt10 Cu50, Cu100, platinum thermal resistance temperature measurement range is generally 200 - below zero 800 ℃, the thermal resistance of copper of 40 to 140 ℃ below zero. Thermal resistance and thermocouple as the distinction between the type, but he does not need compensation conductor, and is much cheaper than thermocouple. Platinum thermal resistance installation form a lot, have a fixed screw to install, thread installation, fixed flange installation, flange installation, pipe installation, straight pipe connector installation, etc. Thermal resistance and thermocouple of the biggest difference is that the temperature range of selection, thermal resistance is measuring the temperature of the low temperature sensor, measure temperature in commonly - Is 200 ~ 800 ℃, and the thermocouple temperature sensor in measuring high temperature, average temperature in 400 ~ 1800 ℃, when the choice if measuring temperature at 200 ℃ or so, should choose to thermal resistance measurement, if measuring temperature at 600 ℃ should choose K type thermocouple, if the temperature of 1200 ~ 1600 ℃ should choose S type or B type thermocouple.