Steam And Gas Vortex Flow Meter With Frequency Output For Easy Digitization

Vortex flowmeter

 Vortex flowmeter is a volume flowmeter developed based on the Karman vortex principle that measures the volume flow rate of gas, steam or liquid, the volume flow rate under standard conditions or the mass flow rate. It is mainly used for flow measurement of industrial pipeline media fluids, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range, and high accuracy. When measuring the volume flow rate under working conditions, it is almost not affected by parameters such as fluid density, pressure, temperature, and viscosity. There are no moving mechanical parts, so reliability is high and maintenance is low. Instrument parameters can be stable for a long time. The vortex flowmeter uses a piezoelectric stress sensor, which is highly reliable and can work within the operating temperature range of -20°C to +250°C. It has analog standard signals and digital pulse signal output, which is easy to use with digital systems such as computers. It is a relatively advanced and ideal measuring instrument.
 

Product description
The vortex flowmeter manual records how to use the product correctly and safely.Please read
this manual carefully before installation and debugging in order to prevent the instrument from being
damaged or unable to perform its best performance and ensure the stable operation of the instrument. Step 1: open the box inspection must read
1. Check the packing list to see whether the accessories are complete. 2. Appearance inspection to see if the instrument is complete and damaged due to
transportation;
3. Power test. If the battery is powered up, turn on the switch to check the display state of the
meter.4. Check whether the installation accessories are complete and prepare for installation. Step 2: read the installation steps
1. Choose an appropriate installation environment. The ambient temperature should be
-20-55℃, and the ambient humidity should be within the range of 5%-90%. See 6.1 installation
environment requirements for the instrument for details;
2. Welding the product accessories, instruments should not be online welding (flange clamping
instrument),Online welding may cause sensor thermal damage;
3. Purge the pipeline to ensure that there is no residual welding slag in the pipeline;
4. Install the instrument, pay attention to the direction sign of the instrument, prohibit reverse
installation, ensure that the front and rear straight pipe meet the requirements,See installation
requirements of instrument pipelines in 6.2 for details;
5. Open the front valve slowly to prevent air hammer or water hammer phenomenon from
hurting the instrument;
6. Pipeline pressure test and leak detection to ensure that the pipeline does not leak;
7. Air tightness test to ensure that the installation instrument meets the sealing requirements;
8. Slowly open the back end valve to ensure stable flow field of medium passing through;
9. Instrument for normal operation;
10. Intallation environment should avoid violent vibration, vibration environment will lead to
unstable flow or static flow.In the case of slight vibration, pipe fastening device can be installed at
the upstream and downstream 2D position, and soft connection can be installed at the connection
place with the fan and other equipment. 11. The installation diagram of vortex flowmeter is as follows:

Features
1. The main body of the product has no moving parts,high reliability,long-term stability,simple
structure and easy maintenance.  The output of the sensor is the pulse frequency, and its frequency is linear with the actual flow of
the measured fluid, there is no drift at zero, and the performance is very stable.  The structure forms are various, including pipe type, plug type flow sensor and so on.  The measurement accuracy of conventional liquid is ±1.0%.The accuracy of the gas
measurement was ±1.5%；
2. The pressure loss is small (about 1/4 to 1/2 of orifice flowmeter), which belongs to
energy-saving flow meter;
3. Flexible installation mode, can be horizontal, vertical or inclined to different angles according to
different process pipeline；
4. Circuit adopts a variety of protection mode, anti-surge, strong adaptability；
5. High precision probe, piezocrystalline vortex sensor, stable signal.The 316L stainless steel
sensor shell has strong corrosion resistance and good intercrystalline corrosion resistance. It also
has good corrosion resistance to alkali solutions and most organic and inorganic acids；
6. Long life lithium battery: equipped with 3.6v high poly lithium battery, with high storage energy
density, the service life of more than 1 year；
7. Products high and low temperature adaptability, environmental protection and other advantages；
8. Wide measuring range, measuring range ratio up to 1:10-25；
9. Within a certain Reynolds number range, the output signal frequency is not affected by the
physical properties and component changes of the fluid, and the instrument coefficient is only
related to the shape and size of the vortex generator,There is no need to compensate when
measuring the volume flow rate of the fluid condition

Working principle
Vortex flowmeter is a speed-type flowmeter produced according to karman's vortex principle, which can be used for the measurement and metering of conventional gas, steam and liquid.Vortex
flow sensor has high precision and wide range ratio, no moving parts in use, which can improve
mechanical stability and reduce maintenance.Vortex flowmeter is almost not affected by the
temperature, pressure and composition of medium when measuring the volume of working condition. Therefore, it is convenient to calibrate the instrument, so vortex flow meter is widely used in
production and life.

Karman Vortex
Alternating and regular vortex rows are formed downstream of the vortex generator. Assume that the frequency of vortex occurrence is f, the average speed of the flow of the measured medium is V, and the width of the vortex generating body's upstream surface is d. According to the Karman vortex street principle, there is the following relationship:
f=StV/d formula (1)
In the formula:
f - Karman vortex frequency HZ generated on one side of the generating body
St-Strauhal number (dimensionless number)
V-Average flow velocity of fluid (m/s)
d-width of vortex generator (m)
It can be seen that the instantaneous flow rate can be calculated by measuring the Kaman vortex separation frequency. Among them, Strohal number (St) is a dimensionless unknown number,
The figure below shows the relationship between Strouhal number (St) and Reynolds number (Re).

Strouhal number and Reynolds number
In the straight part of St=0.17 in the curve table, the vortex release frequency is proportional to the flow rate, which is the measurement range of the vortex flow sensor. As long as the frequency f is detected, the flow rate of the fluid in the pipe can be obtained, and the volume flow rate can be obtained from the flow rate V. The ratio of the measured pulse number to the volume is called the instrument constant (K), see formula (2)
K=3600f/Q(1/m³) Formula (2)
In the formula: K=instrument constant (m-3).
f=number of pulses
Q=volume flow (m³)



FAQ
1. Q: What information need to be provided to choose the suitable model?
A: Application field, Nominal pressure ,Medium & medium temperture , Power supply , Output,
Flow range, Accuracy, Connection and other parameters.
2. Q: Are you a trade company or a manufacturer?
A: We are an ISO approved manufacturer specialized in level and flow measuring instruments.
OEM & ODM service are available. Welcome to visit us in China.
3. Q: What is your MOQ?
A: To start our cooperation, sample order is acceptable.
4. Q: What is your delivery date for the Intelligent Mini Micro Turbine Fuel Oil Diesel Flow Meter?
A: The delivery date is about 3-15 working days after receipt of payment.
5. Q: What is your payment terms?
A: We support T/T, PayPal ,Western Union.
For mass production order, it is 30% deposit in advance and 70% balance before shipment.
6. Q: Do you have a warranty for the Flow Meter?
A: Yes, we have the warranty of 12 months.