Vortex flowmeter inspection | Working principle of vortex steam flowmeter

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1. Can water be used as a medium for calibrating vortex gas flow meters?

Currently, the main calibration devices used for vortex flow meters are the following: sonic nozzle standard device, bell jar, standard meter method. Production enterprises or some calibration institutions still use water for calibration. If you want to obtain a K value, using water for calibration should not be a problem.. However, as a vortex street for measuring gases, the passband of water and gas is different for the same caliber, and the signal strength generated by the medium effect is also different. After calibrating the gas vortex street with water and obtaining the K value, it is necessary to simulate the standard signal and then debug the passband corresponding to the amplification plate.

2. What type of flow meter is used for measuring steam? The commonly used flow meters for measuring steam include balance orifice flow meters and vortex flow meters. Among them, vortex flow meters have become the more favored choice due to their advantages of small pressure loss, simple structure, and easy installation. The following introduces the measurement principle, selection, and application scenarios of the vortex flowmeter: The vortex flowmeter is designed based on the Karman vortex principle, and calculates the flow rate by measuring the vortex frequency generated by fluid oscillation. The specific process is as follows: Vortex generation: When the fluid flows through the vortex flowmeter, the triangular column vortex generator will alternately generate two columns of vortices in the fluid, and the release frequency of the vortices is related to the average flow velocity of the fluid and the characteristic width of the vortex generator. Frequency measurement and flow calculation: By detecting the frequency of vortex release through sensors and combining it with parameters such as fluid density, the average velocity, instantaneous flow rate, and cumulative volume of the fluid can be calculated. The selection points of vortex flowmeter are diverse, and the selection should comprehensively consider the following factors: measuring medium: it is necessary to clarify whether the medium is steam, gas or liquid, and different media have different requirements for flowmeter material and sealing. Medium temperature and pressure: For high temperature or high pressure steam, a temperature resistant and pressure resistant flowmeter should be selected, such as a sensing sensor made of special alloy material. Pipeline diameter and flow range: Select the appropriate range based on the pipeline diameter and steam flow range to avoid a decrease in measurement accuracy caused by a large range. Measurement accuracy and nominal pressure: High precision demand scenarios (such as trade settlement) require the selection of models with higher accuracy levels, while ensuring that the nominal pressure meets system requirements. Protection level and power supply: Flow meters with high protection level (such as IP65) should be selected for outdoor or humid environments, and the power supply should match the site conditions (such as 24V DC or 220V AC). Output signal: Select analog signal (4-20mA) or digital signal (RS485

5, HART protocol) according to the requirements of the control system. The application advantages and scenario advantages of vortex flowmeter: low pressure loss: the fluid passes through the flowmeter with low pressure loss, which can reduce

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