Products
Descipion
I. product features and main technical parameters
Is a simple structure with no moving parts inside
Sensor does not touch the tested medium
Stable performance and long service life
The same sensor can measure liquid, gas, steam
The meter coefficients are independent of fluid temperature, pressure, viscosity and composition changes during specified Reynolds number.
This meter applies to the Reynolds number range:
2 x104-7 x106 (DN25 - DNl00) x104 4-7 x106 (DNl50-12
Product common type can achieve instantaneous, accumulative display
Temperature-pressure compensation can automatically calculate and display parameters such as standard flow rate and operating flow rate, temperature and pressure
Steam temperature pressure compensation can be calculated to show mass flow, temperature, pressure, density and other parameters
Working pressure: 1.6 ~ 4.0MPa
Low medium temperature: - 40 ℃ ~ + 200 (a body) - 40 ℃ ~ + 300 (separated)
Power supply: self-powered 3. 6 VDC; It needs remote transmission and can be connected to DC24V to realize flow variable output
Low temperature: - 25 ℃ ~ + 60 ℃
Relative humidity: 5% ~ 95%
Atmospheric pressure: 86 ~ 106KPa
Type of flow testee: liquid, gas, steam
Accuracy: level 1, 1.5
Output signal:
Analog output :(fully isolated 2 wire system 4-20ma) remote transmission distance of 1000m
Pulse output :(fully isolated three-wire system VH 1 3V) remote transmission distance 500m
485 output :(full isolation of 485 output modbus protocol, which can be directly connected with PLC and computer system state software
Connect connection, no need to write driver, can take 256 loads) remote transmission distance 1200m
Wireless output: fully isolated wireless output modbus protocol, which can be directly connected with PLC and machine state software
Connect connection, no need to write driver, with 256 loads) remote transmission distance 4500m
Explosion rating: ExdIIBT4
II, working principle
When a flow direction is inserted in a flow direction perpendicular to the non streamline column (vortex occurrence), the downstream side of the
Alternately produced two column rotating vortex column, called "Carmen vortex".
In a certain range of Reynolds number, the vortex shedding frequency V and the fluid flow rate f and the vortex occurrence body face
Width d into the following relationships:
Two
F=st*v/d (1)
Formula: St: Straw ha number Strouhal (no amount of steel constant)
As can be seen from the above, as long as the detection of the vortex of the frequency of F, you can measure the flow rate of V, so as to
To achieve measurement of fluid flow in the pipeline Q
V=f*d/St (2)
Q=v*S=f*d/St*S (3)
Type: section area of S pipe
D/St*S as a constant, so 1/K=d/St*S is
Q=f/k (4)
The instrument coefficient (pulse number / L) of K- flow meter is usually calculated by the actual flow test.
Due to vortex occurs on both sides of the body to produce alternating vortex, the vortex force effect on the detection of body to produce alternating stress, the stress pressure electric element, produced and vortices of the same frequency alternating electric charge signal, through the converter after the treatment, the same output and the frequency of the vortex veins signal or and traffic volume is proportional to the 4 20mADC signal.
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