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Why do flow meters need temperature and pressure compensation?
1、 Why do flow meters need temperature and pressure compensation: Most popular flow meters on the market measure volumetric flow rates, such as orifice plates, Venturi valves, vortex streets, turbines, electromagnetic sensors, etc. The units generally include cubic meters per hour: M3/h, liters per minute: L/min, etc. However, the data we want is often tons per hour: T/h, kilograms per minute: Kg/min, because measuring volumetric flow is relatively easy and cost-effective, compared to directly measuring mass flow. We know that quality flow meters are expensive, so most flow meters measure volumetric flow rates. For general situations, such as the internal assessment of Cheyan Huahong, the accuracy requirements for material flow rate are not so strict, and only displaying volumetric flow rate is sufficient. When it comes to trade settlement, its not feasible, especially for gases. The same 1 cubic meter of a certain gas has different pressures, temperatures, and densities. If purchased by cubic meter, there will be significant differences in opinions between the two parties. So, in many application scenarios of flow meters, especially for gases, especially steam, temperature and pressure compensation must be carried out, otherwise accurate measurement cannot be achieved.
2、 How to perform temperature and pressure compensation: For liquids, fluctuations in temperature and pressure have a relatively small impact on density, and unless there are particularly high requirements, temperature and pressure compensation is generally not performed. The density of gas varies greatly with temperature and pressure, so temperature and pressure
3、 The specific process of compensation: For example, a turbine flowmeter measures a certain gas and measures the volumetric flow rate. A temperature gauge and pressure sensor are installed on the pipeline, and three signals are connected to a flow integrator. The flow integrator calculates the mass flow rate corresponding to the number of pulses based on the density of the gas at that temperature and pressure, combined with the diameter and the instrument coefficient of the flowmeter (the number of pulses corresponding to the unit volume flow rate), thereby displaying the mass flow rate of the fluid flowing through the flowmeter.
4、 The specific process of compensation: For example, a vortex flowmeter is used to measure steam. An integrated vortex flowmeter is used, which integrates temperature and pressure sensors. The calculation process of compensation is the same as that of a separate flowmeter. Steam is divided into superheated steam and saturated steam. For superheated steam, temperature and pressure compensation must be used for compensation calculation. Saturated steam, because temperature and pressure appear in pairs, that is to say, at what pressure, what temperature, or what temperature corresponds to what pressure, is fixed. Therefore, only pressure compensation or only tempera
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