1、 Product features and main technical parameters
● Simple structure with no movable parts inside
The detection component does not come into contact with the detected medium
● Stable performance and long service life
The same sensor can measure liquids, gases, and vapors
Within the specified Reynolds number, the instrument coefficient is not affected by changes in fluid temperature, pressure, viscosity, and composition.
This instrument is suitable for the Reynolds number range:
2X104-7X106 (DN25-DN100) 4X104-7X106 (DN150-- DN300)
The ordinary type of product can achieve instantaneous and cumulative display
Temperature and pressure compensation type can automatically calculate and display standard flow rate and operating flow rate, temperature and pressure parameters, etc
The steam temperature and pressure compensation type can calculate and display parameters such as mass flow rate, temperature, pressure, density, etc. by itself
Work pressure: 1.6-4.0MPa
● Medium temperature: -40 ℃~+200 (integrated type) -40 ℃~+300 (separated type)
Power supply: self powered 3.6VDC; Remote transmission is required, and external DC24V can be connected to achieve flow transmission output
● Environmental temperature:- 25℃～+60℃
Relative humidity: 5% to 95%
● Atmospheric pressure: 86-106KPa
Type of fluid being tested: liquid, gas, vapor
Accuracy: Level 1, Level 1.5
● Output signal:
Analog output: (fully isolated two-wire system 4-20mA) remote transmission distance 1000m
Pulse output: (fully isolated three wire system VH -3V) remote transmission distance 500m
485 output: (fully isolated 485 output Modbus protocol, can directly communicate with PLC and computer configuration software)
Connect, no need to write your own driver, can carry 256 loads) Remote transmission distance 1200m
Wireless output: (fully isolated wireless output Modbus protocol, can directly communicate with PLC and computer configuration software)
Connect, no need to write your own driver, can carry 256 loads) Remote transmission distance 4500m
Explosion proof grade: ExdIIBT4

2、 Working principle
When a non streamlined cylinder (vortex generator) with a vertical flow direction is inserted into a fluid, it will
The alternating generation of two vortex columns with internal rotation is called the "Karman vortex column".
Within a certain Reynolds number range, the frequency of vortex release f is related to the fluid velocity V and the frontal flow of the vortex generator
The width d has the following relationship:
　　2
F=st * v/d (1)
In the formula: St： Strouhal number (infinite steel constant)
From the above equation, it can be seen that as long as the frequency f of the vortex is detected, the flow velocity V of the fluid can be measured, thus
Reaching the flow rate Q of the fluid inside the measurement pipeline
V=f * d/St (2)
Q=v * S=f * d/St * S (3)
In the formula: cross-sectional area of S pipeline
D/St * S is a constant, let 1/K=d/St * S, then
Q=f/k (4)
In the formula, the instrument coefficient of K-flowmeter (pulse number/liter) is usually calculated using actual flow tests.