How does the pressure transmitter measuring high temperature change under low temperature conditions?

This article of the editor will talk to you about the changes in the pressure transmitter that measures high temperature under low temperature conditions, or the editor puts it another way, under vacuum or low temperature measurement conditions, the high temperature resistance pressure transmitter. Application scheme: In view of the vacuum or low temperature measurement conditions, the high temperature resistant pressure transmitter is not fully utilized due to its short service life or low measurement accuracy. This paper focuses on the analysis of the influence that will affect the normal operation of the high temperature resistant pressure transmitter. factors, and propose the application scheme of high temperature resistant pressure transmitter for vacuum or low temperature environment. (1) All-welded pressure transmitter. All connections between capillaries, transmitters and process connections are all welded and sealed to eliminate possible leak points. (2) According to different applications, the amount of filling oil can be precisely controlled. According to the user's application and the characteristics of different filling oils, after careful calculation, the amount of filling oil is appropriately reduced to compensate for the expansion effect of the filling oil. For low temperature applications, the amount of filler oil can be appropriately increased according to the specific application to compensate for the effect of volume shrinkage of the filler oil. (3) Special oil replenishment and oil discharge treatment. The main purpose of oil pretreatment for filling oil is to reduce the content of dissolved gas. In the process of oil filling, vacuum oil filling is used, and the oil filling amount is strictly controlled when the oil meets the requirements of vacuum degree, so as to ensure the measurement accuracy of the product. (4) In modern technological processes, high temperature resistant pressure transmitters often adopt a symmetrical design, with the same diaphragm, the same capillary length and the same oil-filled fluid at both high and low pressure ends. It is generally believed that when the effect of temperature change acts on the high and low pressure sides of the transmitter, this effect is eliminated. The effect of temperature on the diaphragm is generally considered to be an important cause of temperature drift. In fact, the opposite is true. Using the same length of capillaries on the high and low pressure sides did not improve performance, but increased the effect of temperature changes on the overall performance of the transmitter. The temperature of the pressure transmitter depends not only on the temperature change of the base product diaphragm, but also the length of the capillary is an important factor affecting the temperature change of the transmitter, and the hardness is proportional to the length of the capillary. The high and low pressure sides use the same capillary length, twice the capillary length, increasing the effect of temperature on the overall performance of the transmitter. That is, if the process temperature is 150°C or lower and the process conditions allow, removing the capillary on the high-pressure side port and connecting it directly to the transmitter can shorten the length of the capillary and reduce the effect of temperature changes on the accuracy and corresponding time of the transmitter. (5) Choose according to the different chemical properties of the measuring medium. The corrosiveness of the same medium with different concentrations at different temperatures is also different. Diaphragm sealed pressure transmitter, the inner diaphragm is generally made of stainless steel, and the liquid-contacting outer diaphragm is selected according to the characteristics of the medium. At present, the commonly used materials are 316L, Monel, hafnium alloy and Tan diaphragm. Consider the housing material of the pressure transmitter according to environmental conditions and economy. The housing material generally includes aluminum alloy and stainless steel. If it is not in a highly corrosive environment, it is more economical to choose aluminum alloy. Well, do you have some new knowledge about pressure transmitters based on the content of the above text? If you have any other content you want to know about the above, please feel free to call for details, or log in to the company's official website to learn more.
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