4-20mA Plug-in Vortex Flowmeter Can Measure Liquid, Gas, Vapor Specifications :
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4-20mA Plug-in Vortex Flowmeter Can Measure Liquid, Gas, Vapor Detail Introduction :
When a non-streamlined cylinder (vortex generator) with a vertical flow direction is inserted into the fluid, two rows of involute vortex rows will be alternately generated on the downstream side, which is called "Kaman vortex row".
Within a certain Reynolds number range, the vortex release frequency f has the following relationship with the flow velocity V of the fluid and the face width d of the vortex generator:
2 F=st*v/d (1) where: St: Strouhal number strouhal (infinite steel constant)
It can be seen from the above formula that as long as the frequency f of the vortex is detected, the flow velocity V of the fluid can be measured, so as to achieve the flow rate Q of the fluid in the measurement pipe V=f*d/St (2) Q=v*S=f*d/St*S (3) Where: S is the cross-sectional area of the pipe D/St*S is a constant, let 1/K=d/St*S then Q=f/k (4)
In the formula: K-flowmeter's meter coefficient (pulse number/liter), usually calculated by actual flow test.
Because the vortex is alternately generated on both sides of the vortex generator, the vortex force acts on the test body to generate alternating stress.
The stress acts on the piezoelectric element to generate an alternating charge signal with the same frequency as the vortex, which is processed by the converter, and output a pulse signal with the same frequency as the vortex or a 4-20mADC signal proportional to the flow rate.
●Simple structure, no moving parts inside
●The detection element does not touch the detected medium
● Stable performance and long service life
●The same sensor can measure liquid, gas, vapor
●Within the specified Reynolds number, the meter coefficient is not affected by changes in fluid temperature, pressure, viscosity and composition.
●The meter is suitable for Reynolds number range: 2X104-7X106(DN25-DNl00) 4X104-7X106(DNl50--DN300
●The ordinary product can realize instantaneous and cumulative display
●The temperature and pressure compensation type can automatically calculate and display the standard flow rate and working condition flow rate, temperature and pressure and other parameters
●The steam temperature and pressure compensation type can calculate and display the mass flow, temperature, pressure, density and other parameters by itself
●Working pressure: 1.6～4.0MPa
●Medium temperature: -40℃～+200 (integrated type) -40℃～+300 (separate type)
●Environmental temperature: -25℃～+60℃
●Relative humidity: 5%～95%
●Atmospheric pressure: 86～106KPa
●Type of measured fluid: liquid, gas, steam
●Accuracy: Class 1, Class 1.5
Analog output: (fully isolated two-wire system 4-20mA) remote transmission distance 1000m
Pulse output: (fully isolated three-wire system VH-3V) long-distance transmission distance 500m
485 output: (fully isolated 485 output modbus protocol, can be directly connected with PLC, computer configuration software, no need to write your own driver, can carry 256 loads) remote transmission distance 1200m
Wireless output: (fully isolated wireless output modbus protocol, can be directly connected with PLC, computer configuration software, no need to write your own driver, can carry 256 loads) long-distance transmission distance 4500m