Jiangsu Huaihai Automatic Control Equipment Co., Ltd. prompts you to: First, the choice of temperature detector There are many types of temperature detection instruments. When selecting a temperature instrument for testing, attention should be paid to the characteristics and applicable range of each instrument. This is also the first key step to ensure the measurement accuracy of the temperature detection instrument. At present, common temperature detection instruments in industry mainly include bimetal thermometers, thermocouples, thermal resistors, and radiation thermometers. Bimetal thermometers are generally used for on-site detection and indication of temperature signals, and the measurement accuracy is not high. Thermocouples, RTDs and radiation thermometers can be used for on-line measurement of temperature signals. Thermoresistors and thermocouples 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. It is more suitable for measuring medium and high temperatures in the range of 500-1800 degrees. Radiant thermometers are generally used for high temperature measurements above 2000 years. In addition, in the selection of temperature detection instrument, in addition to comprehensive consideration of measurement accuracy, signal system, stability and other technical requirements, but also should pay attention to the impact of the working environment and other factors, such as ambient temperature, medium properties (oxidation, reductive, Corrosive), etc., select the appropriate protective sleeve, connecting wire and other accessories. Second, the installation of temperature detection instrument The correct installation of the temperature detection instrument is another key link to ensure the normal use of the instrument. In general, the installation of the temperature detection instrument needs to follow the following principles: 1. The installation of detection elements should ensure the accuracy of measurement and select a representative installation location. For the contact temperature measuring element, the detection element should have a sufficient insertion depth, and the detection element should not be inserted into the dead angle of the medium to ensure that the detection element and the measured medium can perform sufficient heat exchange and measure the medium temperature in the pipeline The working end of the detecting element is located at the point where the center velocity of the pipe is the largest, and the detecting element should be installed facing the direction of fluid flow. When it is not ready, do not install it with the measured medium downstream. Otherwise, the measurement error will easily occur. Measure negative pressure piping ( Or the temperature of the equipment, must ensure that there is a seal, so as to avoid the inhalation of the outside air and reduce the accuracy. 2. The installation of detection components should ensure safety and reliability. In order to avoid the damage of the detecting element, the protective sleeve of the contact measuring instrument should have sufficient mechanical strength, and the material and wall thickness of the protective sleeve can be reasonably selected according to the characteristics of the working pressure, temperature, and corrosivity of the site during use. 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 of the junction box should face down , In order to avoid bad sealing, water vapor, dust and reduce the measurement accuracy. 3, the installation of detection components should be comprehensive consideration of the instrument maintenance, calibration convenience.
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