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1. Doppler open channel flowmeter
2. Could anyone please explain in detail the starting flow rate 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
3. How to wire the two-wire circuit of the vortex flowmeter
The main power supply and output signal wiring 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
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