Selection and installation method of temperature meter

At present, the common temperature detection instruments in the industry mainly include bimetal thermometers, thermocouples, thermal resistances, and radiation thermometers. Bimetal thermometers are generally used for on-site detection and indication of temperature signals, and the measurement accuracy is not high. Thermocouple, thermal resistance and radiation thermometer can be used for online measurement of temperature signals. Thermal resistance and thermocouple are the two most commonly used temperature measuring instruments in the industry. The former is suitable for measuring medium and low temperatures below 500 degrees, the latter It is more suitable for measuring medium and high temperature in the range of 500 to 1800 degrees. Radiation thermometers are generally used for high temperature measurement of more than 2000 masters.


In addition, when selecting a temperature detection instrument, in addition to comprehensive consideration of technical requirements such as measurement accuracy, signal system, and stability, attention should also be paid to the influence of factors such as the working environment, such as ambient temperature, medium characteristics (oxidizing, reducing, Corrosion), etc., select appropriate protective sleeves, connecting wires and other accessories.


The correct installation of the temperature detection instrument is another key link to ensure the normal use of the instrument. Generally speaking, the installation of the temperature detection instrument needs to follow the following principles:


1. The installation of the detection element should ensure the accuracy of the measurement and select a representative installation position. For contact temperature measuring elements, the detection element should have sufficient insertion depth, and the detection element should not be inserted into the dead corner of the medium to ensure that the detection element and the measured medium can conduct sufficient heat exchange. When measuring the temperature of the medium in the pipeline , The working end of the detection element is located in the center of the pipeline where the flow rate is the largest. The detection element should be installed facing the direction of fluid flow. If it is impossible, do not install it downstream with the measured medium, otherwise measurement errors will easily occur; measuring negative pressure pipeline ( (Or on the equipment) temperature must be sealed to prevent the inhalation of outside air from reducing accuracy.


2. The installation of detection components should ensure safety and reliability. In order to avoid damage to the detection components, the protective sleeve of the contact measuring instrument should have sufficient mechanical strength. When in use, the material and wall thickness of the protective sleeve can be selected reasonably according to the working pressure, temperature, corrosiveness and other characteristics of the site. ; When the medium pressure exceeds 10MPa, a protective jacket must be installed to ensure safety; in order to reduce the measurement lag, a good heat transfer filler, such as silicone oil, quartz sand, etc. can be installed inside the protective tube; the hole in the junction box should be facing down , So as not to cause water vapor and dust to enter due to poor sealing and reduce the measurement accuracy.


3. The installation of detection components should comprehensively consider the convenience of instrument maintenance and calibration.


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