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What flow meter is used to measure superheated steam/saturated steam? Vortex flowmeters are generally used to measure superheated steam and saturated steam. To ensure measurement accuracy, appropriate temperature or pressure compensation should be selected based on the characteristics of both. Saturated steam: Water is heated at a certain pressure until it boils and vaporizes. At this point, the steam temperature is equal to the saturation temperature, which is called saturated steam. The saturation pressure and saturation temperature correspond to each other, and both pressure compensation and temperature compensation can be used during measurement. Due to the relatively easy pressure compensation and high measurement accuracy, pressure compensation methods are mostly used in practical applications, such as the use of LUB split vortex flowmeter embedded with HSYB pressure transmitter. Overheated steam: Saturated steam continues to be heated, and when the temperature rises and exceeds the saturation temperature at that pressure, it is called superheated steam. Superheated steam is a single-phase fluid with characteristics similar to gases. Its temperature and pressure are two independent variables, and its density is determined by both. When measuring, any change in temperature or pressure can cause a change in steam density, which in turn affects the mass flow rate. Therefore, temperature and pressure compensation must be performed simultaneously to ensure accuracy, such as when using a LUB split vortex flowmeter with HSYB pressure transmitter and WZPK platinum resistor. In addition, measuring the flow rate of high-temperature steam (superheated steam or saturated steam) can also use LUB integrated vortex flowmeter 
2. Verification regulations for steam flow meters
The core regulations for steam flow meter verification have been clarified, covering two technical routes: static mass method standard devices and differential pressure flow meters.
. 1. Verification Regulations for Steam Flow Standard Devices 1.1 Verification Basis and Scope: Based on the draft regulations for steam flow standard devices using the static mass method, it is applicable to the initial verification, subsequent verification, and in-service inspection of flow meters for superheated steam media. This device is the core equipment for calibrating steam flow meters, with accuracy levels of 0.1, 0.2, and 0.5. 1.2 Working principle: After the installation of the tested flowmeter, the circulating cooling system and steam valve are activated to allow steam to flow through the flowmeter, condense, and enter the flow working standard. Synchronize and compare the output values of the standard device and the tested flowmeter to calculate accuracy and repeatability. Performance requirements for Class 1.3: • Flow measurement uncertainty: 0.1 level ≤ 0.10%, 0.2 level ≤ 0.20%, 0.5 level ≤ 0.50% • Temperature fluctuation: 0.1 level ≤ 0.5 ℃/h, 0.2 level and 0.5 level ≤ 1 ℃/h • Pressure fluctuation: 0.1 level ≤ 0.2%/h, other levels ≤ 0.5%/h • A detailed uncertainty analysis report must be submitted for Class 0.1 devices. two Verification Regulations for Differential Pressure Steam Flowmeters 2.1 Verification Basis: JJG 640-1994 "Verification Regulations for Differential Pressure Flowmeters" is directly adopted, and the standard nozzle is designed and manufactured according to GB