Could anyone please provide a detailed explanation of the starting flow rate of the vortex flowmeter pulse? The more detailed, the better.

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How to cut off the small flow signal of the vortex flowmeter?

When setting the sail pulse output of the vortex flowmeter, it is also necessary to set the small signal cutoff. In fact, from the working principle, the vortex flowmeter with pulse output does not have zero drift. The reason is that when the flow rate is zero, there will be no vortex generated behind the vortex generator device, so there is no pulse output. Due to the large amplitude of the pulse signal output by the probe of the vortex flowmeter, interference is not easy to invade. However, when the flow rate is low and interference is easy to invade, the small flow signal cutoff method is used, so that the lead bench can ensure normal measurement of the instrument at high flow rates and stable grip indication of zero when the flow rate is below the minimum measurable value at low flow rates.

2. What signal does the vortex flow sensor output?

3. Could anyone please explain in detail the starting flow 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 is flexible and can use DC24V or lithium battery 3.6V. Its explosion-proof level is intrinsic safety iaIIbT3-T6, and the protection level is IP65, ensuring its stable operation in harsh environments. As a flow transmitter, vortex flowmeter is widely used in automation control systems. It can not only accurately measure flow, but also provide reliable data support to ensure the normal operation of the system.

4. One of the reasons for the large fluctuation of vortex flowmeters and improvement methods

One of the reasons for the large fluctuation of vortex flowmeters is that when the large-diameter instrument is at the lower limit flow rate, due to the small obstruction of the medium (relative to the vortex), the flow velocity is fast, resulting in a smaller number of pulses generated when 1 cubic