Intelligent turbine flowmeter | The output signal of the turbine flowmeter is 4-20mA. How to calculate the current flow rate based on the output current value ..

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What are the differences between a vortex flowmeter and a turbine flowmeter? The working principle of an intelligent vortex flowmeter is based on the card gate vortex principle, which means that the vortex frequency is proportional to the flow velocity. Its core component is an isosceles triangular cylinder located at the center of the pipeline, with its axis perpendicular to the direction of fluid flow. When fluid flows through a cylinder, vortices alternate on both sides of the cylinder, forming vortex streets. The vortex frequency is directly proportional to the flow velocity. By measuring the vortex frequency, the flow velocity can be calculated, and then the flow rate can be calculated. The flow calculation formula for a vortex flowmeter is Q=3600F · V (m3/h), where F is the flow area of the flowmeter flow body and V is the average flow velocity of the flowmeter flow body. The sensor is equipped with a detection probe inside. When the pulsating pressure generated by the vortex street acts on the probe, the piezoelectric crystal element will generate a charge signal due to stress changes. These signals are amplified, filtered, and shaped to output current or voltage pulse signals with the same vortex frequency. Each pulse represents a certain volume of fluid, and the total number of pulses represents the total volume. The turbine flowmeter utilizes the working principle of generating electric pulse signals by rotating and cutting the magnetic field of the blade when the fluid flows through the sensor. The fluid impulse causes the blades to rotate, overcoming friction and fluid resistance, and the rotational speed is proportional to the flow velocity. The permanent magnet and coil in the signal detector detect the pulse signal generated by the rotation of the blade, amplify and shape it to form a rectangular pulse wave. The flow calculation formula for a turbine flowmeter is: f=kQ/3600, where f is the pulse frequency, k is the instrument coefficient of the sensor, and Q is the instantaneous flow rate of the fluid. The instrument coefficient is provided by the manufacturer and set in the supporting display instrument, which can directly display instantaneous flow rate and cumulative total amount. The main difference between vortex flowmeter and turbine flowmeter lies in their working principle and structural design. The vortex flowmeter is based on the vortex phenomenon and uses the relationship between vortex frequency and flow velocity for flow measurement; The turbine flowmeter uses the impact of fluid on the blades to rotate them, generating pulse signals for flow measurement.

2. The output signal of the turbine flowmeter is 4-20mA. How to calculate the current flow rate based on the output current value 4-20mA signal is a commonly used signal type in industrial automation for transmitting process parameters. The 4mA here usually represents zero flow rate, while 20mA represents maximum flow rate. The difference between the two is the full-scale range, which is 16mA. If the detected current value is 5.6mA, then its difference from the zero point 4mA is 1.6mA. The current flow rate can be calculated using the following formula: upper limit flow rate x (1.6/16), which is one tenth of the upper limit flow rate. To accurately calculate the current traffic, it is first necessary to clarify the specific value of the upper limit traffic. On ordinary turbine flow meters, this value is usually indicated on the nameplate. For int

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