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What does temperature and pressure compensation mean in terms of instrumentation?
Temperature and pressure compensation usually refers to the data measured by instruments under the conditions of a temperature of 25 degrees and a pressure of one standard atmospheric pressure. Usually, the temperature and pressure measured on site are different from the standard, so general instruments can measure the temperature and pressure on site, and then automatically compensate for the measurement results through calculation formulas.. For example, in the measurement of air flow, flow meters such as orifice plate flow meters, double D-bar flow meters, and pin cover Annubar flow meters generally measure the volumetric flow rate at the current temperature and pressure. However, when the volume of air is constant, its mass is greatly affected by temperature and pressure. The calculation formula is PV=NRT=>m=MPV/RT Ideal Gas State Equation, where R is a constant, approximately 8.314 J/(mol · K); P is the gas pressure, measured in Pa; M is the molar mass of the substance (or the average molar mass of the mixed gas); V is the volume of the gas, measured in m3; T is the system temperature, measured in K. For approximate calculation, the temperature is assumed to be at room temperature of 20 ℃ (293K), and the gas approximates ideal gas dispersion. The air quality is m=29g/mol × 101325Pa × 1m ³ ÷ 8.314J/(mol · K) ÷ 293.15K=1205.63g=1.2kg. From the formula, it can be seen that there is a great relationship between air quality and temperature pressure. Therefore, when measuring with instruments, the temperature and pressure on site should be measured first and then automatically compensated. If you have any needs, please searc
2. Why do mass flow meters need temperature and pressure compensation?
In fluid measurement, as long as different working conditions (temperature and pressure parameters) occur, the density of the fluid will change. Whether compensation is needed for the measured fluid is mainly determined by the properties of the fluid we are measuring The majority of flow meters we commonly use can only directly measure the volume of the fluid and cannot directly measure its mass. If we only measure the volume of the fluid under current operating conditions, the instrument can directly display it However, if the electromagnetic flowmeter displays fluid mass, the fluid mass data is obtained by calculating the product of the real-time sampled fluid volume parameter and density parameter (mass=density X volume), rather than directly measuring the fluid mass As an instrument, the data it measures must be accurate. If we want to measure the mass of a fluid, it involves a question: whether the density of the fluid is constant If the density of the fluid remains consistent, then simply fix the density parameter of the fluid on the instrument. However, what should be done when the density of the fluid is constantly changing? At this point, it is necessary to continuously adjust the density parameters of the fluid based on the current operating conditions. This method of adjusting the fluid density parameters based on the fluid operating conditions in flow measurement is density compensation Pressure compensation is actually adjusting the numerical value of fluid density based on the pressure parameters in the fluid operating conditions I
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