Winged-turbine flow meter wiring method

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Winding flow meter wiring method 1: Pulse signal transmission. Three-wire flow sensors that output frequency signals from winding flow meters are powered by DC24V or DC12V power supplies; they are generally connected to display instruments or computers via three-core shielded cables, with the shielding layer being securely connected to the grounding screw on the amplifier housing. The selection of shielded cables should meet the requirements of the on-site environment. Additionally, shielded cables must be separated from other high-power power lines and should not be run side by side. II. Wiring of vortex flowmeters that output standard 4–20mA signals: Two-wire transmitters that generate standard 4–20mA signals are powered by a DC24V supply. They are usually connected to display instruments or computers via two-core shielded cables, with the shielding layer being securely connected to the grounding screw on the amplifier’s casing. The selection of shielded cables should meet the requirements of the on-site environment. Additionally, shielded cables must be separated from other high-power power lines and should not be run side by side. III. Wiring of vortex flow meters with 485 communication interface function. Vortex flow meters equipped with RS-485 communication functionality are powered by a DC24V power supply, and communicate with other devices using a four-wire transmission method. Requirements for straight pipe sections in the installation of vortex flowmeters: Proper selection of the installation location and correct installation of the flowmeter are both very important aspects. Errors in the installation process can, in mild cases, affect measurement accuracy; in more severe cases, they can impact the flowmeter’s service life or even damage it. The requirements for straight pipe sections in the installation of vortex flowmeters are very important. Its detailed requirements are as follows: The flow meter has certain requirements regarding the straight pipe sections upstream and downstream of the installation point; otherwise, it will affect the measurement accuracy. If there is a converging section upstream of the flow meter installation point, there should be a straight section with a diameter equal to that of the pipe of at least 15D (where D is the pipe diameter) upstream of the flow meter, and a straight section of at least 5D in diameter downstream of it. If there is an expansion tube upstream of the flow meter installation point, there should be a straight pipe section with a diameter equal to that of the pipeline of at least 18D upstream of the flow meter, and a straight pipe section of at least 5D downstream. If there is a 90° elbow or a downward fitting upstream of the flow meter installation point, there should be a straight pipe section with a diameter equal to that of the pipeline of at least 20D upstream of the flow meter, and a straight pipe section of at least 5D downstream. If there is a 90° elbow on the same plane upstream of the flow meter installation point, there should be a straight pipe section of equal diameter of at least 25D upstream of the flow meter, and a straight pipe section of equal diameter of at least 5D downstream of it. The flow control valve or pressure control valve should be installed as far downstream as possible, at a distance of 5D from the flow meter. If it must be installed upstream of the flow meter, there should be a straight pipe section of equal diameter of at least 25D upstream of the flow meter, and a straight pipe section of equal diameter of at least 5D downstream of it. If there are piston or plunger pumps, as well as piston or Roots blowers or compressors upstream of the flow meter, there should be a straight pipe section with an equal diameter of at least 25D upstream of the flow meter, and a straight pipe section with an equal diameter of at least 5D downstream of it. Special note: If a valve is installed at a short distance upstream of the vortex flowmeter installation site, constantly opening and closing this valve has a severe impact on the flowmeter’s service life, and can very easily cause permanent damage to it. Flow meters should be installed as far as possible away from very long overhead pipelines, as over time the downward sag of the flow meter can easily lead to leakage at the seal between the flow meter and the flange. If installation is unavoidable, pipe fastening devices must be installed 2D distances upstream and downstream of the flow meter.