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1. Detailed explanation of the usage steps for vortex flowmeters. The standard usage process for Kaifeng Hexin vortex flowmeters (taking the mainstream LUGB series as an example) is divided into four core steps: installation and calibration, on-site use, daily operation and maintenance, and troubleshooting. It is necessary to strictly follow the accompanying factory instructions and JB/T 9248-2015 "Vortex Flowmeters" industry standards.
1. Verification and preparation before installation (1) Appearance and accessory inspection 1 Check the nameplate parameters of the flowmeter body: confirm that the nominal diameter, nominal pressure, medium temperature range, output signal type match the on-site working conditions. The nameplate of Kaifeng Hexin will indicate the factory number and calibration date, and the calibration certificate needs to be retained. 2. Check that the sensor body is not bumped, the wiring terminals are not loose, the matching PTFE/metal sealing gasket is not deformed or damaged, and the signal cable meets the on-site explosion-proof/protection level requirements. The conventional model protection level of this brand is IP65, and the explosion-proof type is Exd II BT4. 3. Confirm that the preamplifier installation position of the split flowmeter is far away from strong electromagnetic interference sources such as frequency converters and high-power motors. （2） Condition matching verification 1 Verify the tested medium: Kaifeng and Xinxin vortex street flow meters are only suitable for clean gases, liquids, and steam. For media containing particulate impurities, a pre filter should be installed and inspected. For corrosive media, the material of the body should be confirmed to be 304/316L to m
II. On site Installation and Wiring (1) Body Installation 1 When using flange connection, it is necessary to ensure that the coaxiality deviation between the flowmeter axis and the pipeline axis is ≤ 0.05D (D is the nominal diameter), to avoid eccentric installation and uneven flow velocity
2. The installation position should avoid local resistance parts such as pipeline elbows and valves. The length of the upstream straight pipe section should be ≥ 20D, and the downstream straight pipe section should be ≥ 5D; for strong interference conditions such as pump rear, the upstream straight pipe section should be increased to 30D, in accordance with the requirements of Kaifeng Hexin Technical Manual
3. When installing horizontally, the sensor detection element should be located below the pipeline axis to avoid the attachment of bubbles or impurities; When installed vertically, the medium needs to flow from bottom to top. 4. The flange bolts should be tightened diagonally to prevent the sealing surface from tilting and leaking. （2） Wiring operation 1 The split type flowmeter needs to be connected to the shielded cable of the sensor and preamplifier first, and the shielding layer needs to be grounded at one end to avoid electromagnetic interference. 2. Before wiring, the on-site power supply must be disconnected, and the power supply voltage must be checked to be consiste