Explosion proof vortex flowmeter | Detailed instructions for using vortex flowmeter for Kaifeng Hexin model

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1. How to connect the two-wire circuit of the vortex flowmeter? The main power supply and output signal terminals of the vortex flowmeter are located on the left side and adopt a 2-position hanging frame spinning terminal design. Among them, the "-" terminal is used for 4-20mA current output, while the "+" terminal is connected to the positive pole of the 15-24V power supply. Connect the "+" terminal to the positive pole of the external power supply, and the current flows out from the "-" terminal, passes through the sampling resistor of the computer or display meter, passes through the sampling resistor and other loads, and then flows back to the negative pole of the power supply. The auxiliary wiring uses a 3-digit small terminal. In the pulse output wiring section, the V+terminal should be connected to the positive pole (+12V) of the pulse output power supply, the F terminal is the pulse output signal terminal, and the 0 terminal needs to be connected to the negative pole of the pulse output power supply. Pulse output must be used under the power supply of the main current circuit, and its output is an uncorrected optically isolated raw pulse with 50Hz cut-off, usually used in the calibration process. The output signal adopts a collector open circuit output form with a 1K5 pull-up resistor. For intrinsically safe explosion-proof rough bright vortex flowmeters, their explosion-proof mark is Exia II CT2-T6, which means that explosion-proof safety barriers must be added between the associated equipment such as display instruments or computers. Therefore, when the vortex flowmeter is installed in a hazardous area, related equipment such as safety barriers, display instruments, power supplies, and computers should be installed in a safe area. For specific wiring methods, please refer to the wiring guide provided by the explosion-proof safety barrier manufacturer, including the key voltage and attached diagram.

2. Top 10 Brands of Vortex Flowmeters in China

There is no official unified ranking of "Top 10 Brands" in the Chinese vortex flowmeter market, but according to industry recognition and market performance, the following are the main representative brands and their core characteristics

1. Chuanyi Co., Ltd. - established in 1965, a state-owned holding enterprise with comprehensive product line coverage - the core product PA300 series has a pressure resistance of 42MPa and has passed explosion-proof certification (Ex), suitable for flammable and explosive environments such as natural gas and refineries.

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