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1. Could someone please explain in detail the starting flow rate issue of the flowmeter? The more detailed the better.
The vortex flowmeter is a flow measurement instrument designed based on the Karman vortex principle, suitable for measuring the volumetric flow rate of gases, liquids, and vapors, as well as the volumetric flow rate or mass flow rate under standard conditions.. Its measuring medium includes but is not limited to gas, liquid, and vapor, with various connection methods including flange clamping, flange, and insertion, and a wide range of caliber options. The measurement range of the vortex flow sliding pin gauge is wide and suitable for fluids with Reynolds numbers between 1.5 × 104 and 4 × 106. For gases, the measurement range is 5-50m/s; The measurement range for liquids is 0.5-7m/s. In addition, the measurement accuracy of vortex flowmeter is divided into 1.0 level and 1.5 level, and it is believed that the temperature range of the measured medium covers normal temperature -25 ℃~100 ℃, high temperature -25 ℃~150 ℃ or -25 ℃~250 ℃. This flowmeter has two output modes: pulse voltage output signal and pulse current remote transmission signal. The high level of the pulse voltage output signal is 8-10V, the low level is 0.7-1.3V, the pulse duty cycle is about 50%, and the transmission distance can reach 100 meters. The pulse current remote transmission signal is 4-20 mA, with a transmission distance of 1000 meters. The working environment requirements for vortex flowmeters are relatively tolerant, with a temperature range of -25 ℃ to+55 ℃ and humidity of 5-90% RH below 50 ℃. The material selection of vortex flowmeter is diverse, including stainless steel and aluminum alloy. The power supply i
2. National Standard Specification for Vortex Flow Meter
The national standard specification for vortex flow meter mainly includes the following items
1. GB/T 25922-2023 standard name: "Measurement of fluid flow in closed pipelines using vortex flow meters installed in circular cross-section pipelines filled with fluid". Issued by the State Administration for Market Regulation and the National Slag and Rock Standardization Management Committee. Centralized unit: China Machinery Industry Federation. Implementation date: March 1, 2024. Remarks: This standard is equivalent to the international standard ISO 12764:2017 and is applicable to the measurement of fluid flow in closed pipelines.
2. JB/T 9249-2023 2015 Standard Name: What is the Failure of the Machinery Industry Recommended Standard Supervisory Department: Ministry of Industry and Information Technology/National Energy Administration Implementation Date: March 1, 2016 Remarks: This standard completely replaces JB/T 9249-1999, Belonging to industry recommended standards
3. JJF (Anhui) 179-2024 standard name: "Online Calibration Specification for Gas Vortex Flow Meter" Scope of application: Applicable to gas vortex flow meters with a diameter greater than DN50mm, used for measuring specific conditions of steam or other gas media, an
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