How to select a steam vortex flowmeter?

1. The selection of vortex flowmeter should not use the flow rate to work at the lower limit limit as much as possible, so the diameter of the flowmeter should be as small as possible to obtain a larger flow rate and flow range.

2. In the use of the flowmeter, if the place used is in the most dangerous place, the explosion-proof vortex flowmeter is the first choice.

3. The lower limit flow rate of the vortex flowmeter depends on the working density and kinematic viscosity of the medium, and its upper limit flow is generally not affected by the pressure and temperature of the medium, so the flow range can be determined only by determining the actual available lower limit flow. After the lower limit flow rate is calculated, the corresponding caliber can be determined by checking the flow range table.

4. The use of vortex flowmeter should be within the technical parameters of the working pressure and temperature range of the medium. Don't choose a high pressure level or a high temperature instrument, just choose the right model.

There are several things that need to be paid attention to in the selection of vortex flowmeters:

1. The following working parameters must be determined, such as: fluid name, component, maximum, common and minimum flow rate in working state; Maximum, commonly used, minimum working pressure and operating temperature, density; the viscosity of the medium in working condition; Flowmeter output signal requirements; the degree of protection of the flow meter; Material requirements for the flow meter body.

2. The selection of caliber, the caliber of the flowmeter is mainly for the lower limit and upper limit of the flow, and it should meet the following conditions: the minimum Reynolds number should not be lower than the limit Reynolds number (rec=20000), and the vortex intensity should be greater than the allowable value of the vortex strength of the flowmeter sensor when the flowmeter is at the lower limit of the flow rate (the vortex strength is proportional to the lift PU2); The maximum number of Reynolds of the flow rate cannot exceed rec=7*106 (if the upper limit is determined from the flow rate.) In general, the fluid flow velocity does not exceed 7 ms for liquids, 35 ms for gases, and 70 ms for steam); For liquids, it should also be checked whether the minimum working pressure is higher than the saturated vapor pressure at the operating temperature, i.e. cavitation is generated.

Of course, the determination of the flow measurement range should also check whether it is in the optimal working range of the flow meter.

3. According to the customer's requirements for the output signal of the flowmeter, the demand may be different, the choice is also different, the main output signal is mainly three-wire voltage pulse signal, 4-20mA current signal, RS485 communication or other communication methods.

The option of the flowmeter needs to be based on the actual demand parameters, because the demander needs to provide the necessary parameters to the manufacturer, including the basic information of the installation site, pipe diameter, temperature, medium, pressure, installation method, environmental conditions and other factors. At the same time, the quality of the instrument must be passed, and high accuracy is the fundamental condition. Then according to the performance of the instrument, the most ideal flowmeter is finally determined.

The selection of vortex flowmeter mainly confirms the following parameter requirements:

1. Measuring medium. Turbine flowmeter is a kind of velocity flowmeter, which uses the principle of Kármán vortex street, when the medium passes through the vortex generator, it will form a small vortex in the back, and through the number of vortices, it can be converted into the flow rate of the medium, and then converted into the flow rate of the medium. Its principle determines the type of measuring medium, which can be liquid, gas or vapor.

At present, most industrial occasions, such as nitrogen, compressed air, steam, heat transfer oil, etc., are mostly measured by vortex flowmeters.

2. Pipe diameter. According to the different installation methods, the vortex flowmeter can be divided into pipeline type and plug-in installation. For the pipeline type, the pipe diameter is the same as most other flow meters, the small is DN15, and the large can reach DN300.

If a larger caliber is required, you can choose to install it by plug-in, and the conventional caliber range can reach DN2000, and the caliber above DN2000 will be supplied according to the agreement.

3. Measurement accuracy. There are also several levels of accuracy of vortex flowmeters, and they are classified according to the measurement medium. Pipeline vortex flowmeter, if it is for liquid measurement, the measurement accuracy can reach the level, and for gas measurement, the accuracy can reach the level.

If it is a plug-in vortex flowmeter, the accuracy can reach level and level.

4. Medium temperature. Generally speaking, it is divided into three ranges, which are divided into normal temperature, medium temperature and high temperature. The temperature range is -40 100 (250 for normal temperature (320 for medium temperature).

If the temperature of the medium in the field is higher, such as some superheated steam, it can be measured with an orifice flowmeter.

5. Nominal pressure. Mainly according to the installation method, the main demand in the market is the following categories, such as flange card type (flange connection type (, plug-in installation type (.

6. Power supply. According to the current market demand, there are mainly +12VDC (three-wire pulse output), +24VDC (three-wire pulse output type and two-wire current output type) lithium battery and dual power supply.

7. Output signal. According to the current market demand, there are mainly voltage frequency pulse output, two-wire 4-20mA output and HART output. In addition, in some cases where digital output may be required, we can also provide RS485 communication with Modbus.

The selection of vortex flowmeter needs to take into account the following factors: 1Measuring medium type:

Different media types have an impact on the measurement of vortex flowmeters, e.g. high viscosity or corrosive substances can accelerate damage to sensor components. 2.Measure Pipe Type:

The vortex flowmeter needs to be consistent with the diameter of the pipeline to be measured, and ensure the concentricity of the pipeline and the flowmeter. 3.Measuring range and accuracy:

The measurement range and accuracy of the vortex flowmeter are important considerations in the selection. 4.Working environment conditions:

Environmental conditions can also affect the measurement accuracy of vortex flowmeters. For example, in low-temperature environments, it is necessary to use a freeze-proof design and ensure that the transmission line is not damaged by cold climates. In extreme climates, safety measures such as risk issues need to be considered.

5.Signal output mode: The signal output mode of vortex flowmeter needs to be selected according to the actual application requirements.

Common signal output methods include pulse output, 4-20mA current signal, etc.

The vortex flowmeter is selected from the three major elements of measuring medium, temperature and pressure, and it can measure a wide range of media, including gases, liquids and steam.

It depends on whether the gas measuring belt has temperature and pressure, compensation, and what kind of gas you have.

The steam vortex flowmeter is a new type of flowmeter with international advanced level developed based on the principle of Carmen vortex street. The installation technology of the steam vortex flowmeter has the following points:

1.Strong vibration and strong magnetic interference shall not be generated at the installation site. Vibrations in pipes caused by pumps, valves, etc., can cause measurements.

2.The instrument should pay attention to waterproof, moisture-proof and sun-proof outdoors, and use a protective cover to shade the sun, especially pay attention to the U-coil at the cable interface to prevent moisture from entering the amplifier shell from the cable.

3.Make sure that the medium in the pipeline is full, and the flow meter can be installed on the horizontal or vertical pipeline, if installed on the vertical line, the measured medium is liquid, then flow from the bottom to the top.

Dear, hello, I am glad to serve you, about the vortex steam flowmeter can be installed vertically, for your reply is 1, the vortex flowmeter can only be measured in one direction, pay attention to ensure that the direction of the medium flow is consistent with the direction shown by the arrow of the flowmeter during installation. 2. The best installation of the vortex flowmeter is the vertical installation, and the medium passes through the flowmeter from bottom to top. That is, the flow meter is installed on a vertical pipe, and the flow direction is from bottom to top.

3. When installed horizontally, the flowmeter must be installed in the high-pressure area of the whole system, and the corresponding outlet pressure must be guaranteed; Do not install it at the highest point of the pipeline, because the highest point often accumulates gas, the pipe is not full, and the outlet cannot be directly vented. 4. When measuring high-temperature fluids, try to use vertical installation; If it has to be installed horizontally, please install the transmitter part of the flowmeter vertically downwards or horizontally to avoid excessive temperature; Pay attention to the installation location where the air is well flowed or ventilated. 5. Requirements for straight pipe sections:

At least 15 times the diameter of the pipe in front of the flowmeter and 5 times the diameter of the pipe in the back of the flowmeter. If there are interference sources such as elbows, indentation, and expansion in front of the flowmeter, it is necessary to ensure that the pipe diameter is 30-40 times before the flowmeter and 6 times the pipe diameter after the flowmeter. The flow meter should be installed upstream of the regulating valve, pressure or temperature sensor.

6. When installing, pay attention to the diameter of the pipeline chain should be slightly greater than or equal to the inner diameter of the instrument. 7. When using the sealing ring, pay attention to the inner diameter of the sealing ring should be slightly greater than or equal to the inner diameter of the instrument, and the center of the sealing ring is located in the center of the pipeline. 8. When the cable inlet seals the electrical connection of the instrument, attention must be paid to the sealing of the inlet hole.

The sealing interface must be selected according to the instrument cable entry type and installed correctly and tightly. There is no sealing joint, or the installation is sloppy, and the sealing effect cannot be achieved.

Summary. Integrated design of temperature and pressure compensation; The current output is galvanically isolated, with good common-mode interference suppression ability; The traffic value and the cumulative flow value are displayed at the same time, so there is no need to switch them in turn. The anti-vibration probe is used to effectively eliminate the influence of external vibration.

The circuit adopts a surface mounter to set up a triangular cylindrical vortex generator in the fluid, and a regular vortex is alternately generated from both sides of the vortex generator, and this vortex is called a Kármán vortex, as shown in the figure on the right, the vortex is arranged asymmetrically downstream of the vortex generator.

The following relationship can be obtained by assuming that the frequency of the vortex is f, the average flow velocity of the measured medium is, the width of the frontal surface of the vortex generator is d, and the diameter of the surface body is d

f=sru1/d=sru/md

1) where the average flow velocity on both sides of the u1 vortex generator, m s; SR Strauhar number; m The ratio of the bow area on both sides of the vortex generator to the cross-sectional area of the pipeline.

How to slow down the steam vortex flowmeter.

Hello, I am helping you to inquire about the relevant case and will reply to you immediately.

Integrated design of temperature and pressure compensation; The current output is galvanically isolated, with good common-mode interference suppression ability; The traffic value and the cumulative flow value are displayed at the same time, so there is no need to switch them in turn. The anti-vibration probe is used to effectively eliminate the influence of external vibration. The circuit adopts a surface mounter to set up a triangular cylindrical vortex generator in the fluid trap, and a regular vortex is alternately generated from both sides of the vortex generator, and this vortex is called a Kármán vortex, as shown in the figure on the right, the vortex is arranged asymmetrically downstream of the vortex generator.

The following relationship can be obtained by assuming that the frequency of the vortex is f, the average flow velocity of the measured medium is, the width of the frontal surface of the vortex generator is d, and the diameter of the surface body is d: f=sru1 d=sru md (1) where the average flow velocity on both sides of the vortex generator of u1 is enlightened; SR Strauhar number; m The ratio of the bow area on both sides of the vortex generator to the cross-sectional area of the pipeline.

Ask where to slow down.

Steam vortex flowmeter slow-down method: integrated design of temperature and pressure compensation, current output is electrically isolated, and has good ability to suppress spring limbs with common mode interference; The traffic value and the cumulative flow value are displayed at the same time, so there is no need to switch them in turn. The anti-vibration probe is used to effectively eliminate the influence of external vibration.

The circuit adopts a surface mounter, and a triangular cylindrical vortex generator is arranged in the cover fluid, and a regular vortex is alternately generated from both sides of the vortex generator, which is called a Kármán vortex, and the vortex is arranged asymmetrically in the downstream of the vortex generator.

You can do this by modifying the Reynolds coefficient.

Hello dear! Glad you asked: I have found that the adjustment of the steam vortex flowmeter needs to be adjusted according to the specific brand and model, and can usually be adjusted by the following steps:

1.Open the cover plate of the flow meter and locate the adjustment screw. Swift Dissipation 2

Adjust the speed of the rotor to the desired speed with a special tool adjustment screw. 3.Close the cover, restart the flow meter, and check whether the required flow rate has been reached.

It should be noted that care should be taken when adjusting the screws to avoid over-adjustment and causing problems with the flow meter. In addition, it is recommended to read the instruction manual of the flowmeter before making adjustments to avoid damage caused by improper operation. If you are not familiar with how to operate, it is best to ask a professional technician to adjust.

Hello! We're happy to answer for you! Slowing down the measurement range of the steam vortex flowmeter can be achieved by reducing the frequency of the electrical signal.

The specific adjustment method may vary slightly, depending on the device model and parameters. In general, you can do it according to the following steps:1

Start by identifying the range that needs to be adjusted, e.g. from 0-500 m³ hours to 0-300 m³ hours. 2.In the control system connected to the steam vortex flowmeter, you can find the corresponding adjustment interface or software menu, where you can configure the measurement range and pulse output frequency.

Including group hand 3Adjust according to the set range: If you need to reduce the range to 0-300 cubic meters, you can adjust the pulse output frequency to 3 5.

In this way, the number of pulses generated by the flow meter in the same amount of time is reduced, and the flow meter is able to measure a lower flow rate. It should be noted that when adjusting the measurement range, the manufacturer's instructions and phase or absence standards should be followed to ensure the stability and safety of the device. The correct adjustment method can enhance the precision and stability of the equipment, while also extending the service life of the equipment and reducing maintenance costs.