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Jiangsu Huayun Instrument Co., Ltd
Common flow meters for compressed air
NegotiableUpdate on 11/29
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Overview
Which gas flow meter is suitable for compressed air flow? Nowadays, the flow meters used vary depending on the user's measurement needs. For large construction sites and other production enterprises that use it as a power source, it is recommended to use the HY-LUGB vortex flowmeter produced by our company. For enterprises with high requirements for measurement accuracy, the HY-LUBG type is more suitable. For enterprises that use gas added to combustion equipment such as kilns, it is recommended to use our company's HY-TGMFM thermal gas mass flowmeter. Product price: Price 450.00~73800.00
Product Details
Which gas flow meter is suitable for compressed air flow? Nowadays, the flow meters used vary depending on the user's measurement needs. For large construction sites and other production enterprises that use it as a power source, it is recommended to use the HY-LUGB vortex flowmeter produced by our company. For enterprises with high requirements for measurement accuracy, the HY-LUBG type is more suitable. For enterprises that use gas added to combustion equipment such as kilns, it is recommended to use our company's HY-TGMFM thermal gas mass flowmeter.
Product price:
| price |
¥ 450.00 ~73800.00
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| Minimum order quantity | ≥1 Taiwan |
Product Specifications
| Processing & Customization | yes | brand | Huayun | model | HY |
| type | mass flow meter | measurement range | 3~32000（m3/h） | accuracy class | 0.5%, 1%, 1.5% |
| Nominal Diameter | DN15~DN600（mm） | Applicable Medium | Steam, gas, liquid | work pressure | PN1.6、PN2.0、PN2.5（MPa） |
| Operating Temperature | -40℃~ +300℃（℃） | Specifications | DN15-DN40,DN50-DN125,DN150-DN250,DN300 | display mode | No display or LCD display |
| connection method | flanged | output method | Pulse signal or two-wire 4-20mA |
Application of flange clamp vortex flowmeter
The VFM series card mounted vortex flowmeter is mainly used for flow measurement of industrial pipeline media fluids, such as gases, liquids, vapors, and other media. Its characteristics are small pressure loss, large range, high accuracy, and almost unaffected by parameters such as fluid density, pressure, temperature, viscosity, etc. when measuring volumetric flow rate under working conditions. No movable mechanical parts, therefore high reliability and low maintenance. The instrument parameters can remain stable for a long time. This instrument uses piezoelectric stress sensors with high reliability and can operate within a temperature range of -20 ℃ to+250 ℃. It has both analog standard signals and digital pulse signal outputs, making it easy to use in conjunction with digital systems such as computers. It is a relatively advanced and ideal flow meter.
Characteristics of flange clamp vortex flowmeter
Easy to install and maintain;
The structure is simple and sturdy, with no movable parts, making it highly reliable for long-term operation;
Wide range, with a range ratio of up to 1:15;
Low pressure loss, low operating costs, and greater energy-saving significance;
Widely applicable, capable of measuring liquids, gases, and vapors;
The verification cycle is long, usually two years;
Within a certain Reynolds number range, the output signal is not affected by the physical properties and composition changes of the measured medium, and the instrument coefficient is only related to the shape and size of the vortex generator. After replacing the accessories, there is generally no need to recalibrate the instrument coefficient;
It can be displayed on-site, transmitted over long distances, and connected to computer control systems;
The detection probe does not directly contact the measured medium, resulting in more stable performance.
Advantages of Jiangsu Huayun flange clamp vortex flowmeter
Due to its excellent medium adaptability, it can directly measure the volumetric flow rate of steam, air, gas, water, and liquid without temperature and pressure compensation. Equipped with temperature and pressure sensors, it can measure standard volumetric flow rate and mass flow rate, making it an ideal alternative to throttling flow meters. In order to improve the high temperature resistance and vibration resistance of vortex flow meters, our company has recently developed the LUGB improved vortex flow sensor. Due to its unique structure and material selection, the sensor can be used in harsh working conditions such as high temperature (350 ℃) and strong vibration (≤ 1g). It can also reduce the requirements for straight sections of process pipes, making installation very convenient.
HY-LUGB Vortex Flow Meter:
Advantages: High measurement accuracy and good stability; Can work normally under low water conditions;
Disadvantage: It is not recommended to use it on work sites without a dryer, as the flow range is slightly smaller.
HY-LUGB type vortex flowmeter:
Advantages: High cost-effectiveness, can work normally on site without a dryer;
Disadvantage: It is greatly affected by work environment factors and has high installation requirements.
The measurement of compressed air flow meters is a large-scale and wide-ranging measurement task in enterprises. Temperature and pressure compensation in gas flow measurement is already an old topic, but the more we discuss it, the deeper our understanding will be. It can inspire people to develop instruments with low price, high accuracy, and strong functionality, and inspire automation professionals to choose and use instruments well.
The purpose of temperature and pressure compensation in measurement is to correct the influence of the general gas density on the measurement results when the gas operating conditions deviate from the design operating conditions. Because natural gas is in a gaseous state, its density undergoes significant changes when its temperature and pressure fluctuate. Without compensation, the resulting errors can be significant. For example, if the design pressure is 1MPa (gauge pressure), when the pressure drops to 0.8MPa, the density drops to 82% of the design value. If temperature and pressure compensation is not performed, the impact on the differential pressure flowmeter is to increase the reading by 10.4%, while the impact on the vortex flowmeter is to increase the reading by 21.9%. Obviously, for flow measurement objects with temperature and pressure changes, in addition to direct mass flow meters, temperature and pressure compensation must be performed.
Principle of Compressed Air Flow Meter
According to the principle of Karman vortex, a non streamlined blocking fluid inserted vertically into the fluid is used to generate vortex diversion. When the fluid passes around a non streamlined cylinder, due to the instability of the boundary layer, the vortices separated by the object have a certain regularity. When the Reynolds number is high, the vortex forms and separates on one side of the cylinder, and the other side cannot form a vortex. Only when one side of the vortex is separated from the cylinder by a certain distance, can the other side form a vortex. So, as the fluid continues to flow, alternating and regular vortex columns are formed on both sides of the cylinder for detection. That is, piezoelectric crystals are used to detect the vortex frequency generated when the fluid passes through the triangular column inside the pipeline, and the flow rate of the fluid is measured.
Advantages of Compressed Air Flow Meter Products:
Not affected by temperature and pressure, and not easily clogged, stuck, or scaled, resistant to high temperatures and pressures.
▲ Safe and explosion-proof, suitable for harsh environments.
▲ No movable parts, no hollow gaps design, the product is wear-resistant, dirt resistant, does not require mechanical maintenance, and has a long service life.
▲ Adopting low-power high-tech and battery powered on-site display flowmeter, it can operate continuously for more than two years without electricity.
▲ Integrated design of voltage regulation and compensation.
▲ The current output is all electrically isolated, with good common mode interference suppression capability.
Simultaneously display the flow value and cumulative flow value, without the need to switch between them.
▲ Adopting anti vibration probes to effectively eliminate the influence of external vibrations.
The circuit adopts surface mount technology, with a compact structure and high reliability.
▲ Adopting a split type signal converter, the cable * * * is 10 meters long.
▲ The range ratio is as wide as 20:1.
The overall structural design is reasonable, the dynamic measurement range is wide, and the pressure loss is small.
The split type vortex flowmeter is made of stainless steel material and is suitable for measuring corrosive media.
▲ On site LCD display, pulse, 4-20mA output or 485 communication, can be connected to industrial automation systems.
Compressed air flow meters have the advantages of high measurement accuracy, wide range, low power consumption, easy installation, simple operation, and low pressure loss. They can measure volumetric flow rate or standard volumetric flow rate under working conditions (integrated intelligent temperature and pressure compensation). According to user needs, pulse or 4-20mADC current output function can be attached. It is currently an ideal natural gas measuring instrument. The natural gas flowmeter produced by our company is widely used in industries such as petroleum, chemical, power, metallurgy, and urban gas supply to measure various gas flow rates. It is currently an affordable product for natural gas transmission and distribution measurement and trade measurement in oil fields and cities.
Advantages of Compressed Air Flow Meter:
1. Built in pressure, temperature, and flow sensors with high safety performance, compact structure, and beautiful appearance.
2. Display temperature, pressure, instantaneous flow rate, and cumulative flow rate on site.
3. By adopting a new type of signal processing amplifier and unique filtering technology, the interference signals generated by pressure fluctuations and pipeline vibrations are effectively eliminated, greatly improving the anti-interference ability of the flowmeter and ensuring excellent stability for small flow rates.
4. The flowmeter has unique functions of time display and real-time data storage, which can ensure that internal data will not be lost and can be saved in any situation.
5. The whole machine has extremely low power consumption and can operate for a long time with internal battery power supply, making it an ideal on-site display instrument without the need for external power supply.
6. The header can rotate 180 degrees freely, making installation convenient.
Selection of Compressed Air Flow Meter
Faced with so many varieties of compressed air flow meters, it has become a difficult problem for ordinary users to choose. How to scientifically and objectively select the best flowmeter, flowmeter is a problem that needs attention. We believe that selection should follow appropriate rules, avoid misleading advertising from manufacturers as much as possible, and find a natural gas flowmeter that is just right for oneself. It is our ideal flowmeter.
Selection can be made in five aspects: performance of compressed air flow meter, fluid characteristics, installation conditions, environmental conditions, and economic factors. The various considerations are as follows:
1. In terms of flowmeter performance: degree, repeatability, linearity, range, pressure loss, upper and lower limit flow rates, signal output characteristics, response time, etc;
2. In terms of fluid characteristics of flow meters: fluid pressure, temperature, density, viscosity, lubricity, chemical properties, wear, corrosion, scaling, dirt, gas compression coefficient, isentropic index, specific heat capacity, conductivity, sound velocity, mixed phase flow, pulsating flow, etc;
3. Installation conditions for flow meters: pipeline layout direction, flow direction, upstream and downstream pipeline length, pipeline diameter, maintenance space, pipeline vibration, grounding, power supply, auxiliary equipment (filtration, sewage), explosion-proof, etc;
4. In terms of economic factors of compressed air flow meters: purchase cost, installation cost, maintenance cost, calibration cost, service life, operating cost (energy consumption), spare parts, etc.
Selection and size of compressed air flow meter
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Nominal diameter (mm) |
15. 20, 25, 40, 50, 65, 80, 100, 125, 150, 200, 350, 300 (300-1000 plug-in type) |
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Nominal pressure (MPa) |
DN15-DN200 4.0 (>4.0 protocol supply), DN250-DN300 1.6 (>1.6 protocol supply) |
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Medium temperature (℃) |
Piezoelectric type: -40~150, -40~260, -40~330; Capacitive: -40~400, -40~500 (protocol ordering) |
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body material |
1Cr18Ni9Ti， (Other material agreement supply) |
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Allow vibration acceleration |
Piezoelectric type: 0.2g Capacitive type: 1.0-2.0g |
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degree |
± 1% R, ± 1.5% R; Insertion type: ± 2.5% R, |
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Range degree |
1：6～1：30 |
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power supply voltage |
Sensors: DC+12V, DC+24V; Transmitter: DC+12V, DC+24V; Battery powered type: 3.6V battery |
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output signal |
Square wave pulse (excluding battery powered type): high level ≥ 5V, low level ≤ 1V; current: 4-20mA |
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Pressure loss coefficient |
Complies with JB/T9249 standard Cd ≤ 2.4 |
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Explosion-proof marking |
Intrinsic safety type: Exd Ⅱ ia CT2-T5 Explosion proof type: Exd Ⅱ CT2-T5 |
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Protection level |
Regular IP65 Submersible IP68 |
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environmental conditions |
Temperature -20 ℃~55 ℃, relative humidity 5%~90%, atmospheric pressure 86~106kPa |
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Applicable Medium |
Gas, liquid, steam |
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transmission distance |
Three wire pulse output type: ≤ 300m, two-wire standard current output type (4-20mA) ≤ 1500m; Load resistance ≤ 750 Ω; RS485/HART≤1200m. |
Methods to reduce errors:
When the total compressed air flow meter is installed before the pressure reducing valve, there is no phase change problem when the steam is not reduced. Therefore, installing the flow meter before the pressure reducing valve and treating it according to the saturated steam compensation method can ensure measurement accuracy.
If the flowmeter can only be installed behind the pressure reducing valve, an additional pressure transmitter can be installed for temperature and pressure compensation.
If the pressure stabilizing performance of the pressure reducing valve is good, the upstream pressure value of the flowmeter can be set as a constant value (through panel operation) in the secondary meter for temperature and pressure compensation.
Main technical indicators of compressed air flowmeter:
|
Nominal diameter (mm) |
15. 20, 25, 40, 50, 65, 80, 100, 125, 150, 200, 350, 300 (300-1000 plug-in type) |
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Nominal pressure (MPa) |
DN15-DN200 4.0 (>4.0 protocol supply), DN250-DN300 1.6 (>1.6 protocol supply) |
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Medium temperature (℃) |
Piezoelectric type: -40~150, -40~260, -40~330; Capacitive: -40~400, -40~500 (protocol ordering) |
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body material |
1Cr18Ni9Ti， (Other material agreement supply) |
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Allow vibration acceleration |
Piezoelectric type: 0.2g Capacitive type: 1.0-2.0g |
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degree |
± 1% R, ± 1.5% R; Insertion type: ± 2.5% R, |
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Range degree |
1：6～1：30 |
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power supply voltage |
Sensors: DC+12V, DC+24V; Transmitter: DC+12V, DC+24V; Battery powered type: 3.6V battery |
|
output signal |
Square wave pulse (excluding battery powered type): high level ≥ 5V, low level ≤ 1V; current: 4-20mA |
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Pressure loss coefficient |
Complies with JB/T9249 standard Cd ≤ 2.4 |
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Explosion-proof marking |
Intrinsic safety type: Exd Ⅱ ia CT2-T5 Explosion proof type: Exd Ⅱ CT2-T5 |
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Protection level |
Regular IP65 Submersible IP68 |
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environmental conditions |
Temperature -20 ℃~55 ℃, relative humidity 5%~90%, atmospheric pressure 86~106kPa |
|
Applicable Medium |
Gas, liquid, steam |
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transmission distance |
Three wire pulse output type: ≤ 300m, two-wire standard current output type (4-20mA) ≤ 1500m; Load resistance ≤ 750 Ω; RS485/HART≤1200m.
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Precautions for installation of compressed air flow meter:
The correct installation of instruments is an important part of ensuring their normal operation. If not installed properly, it can affect the accuracy of instrument use, and in severe cases, it can affect the service life of instruments and even damage them.
Installation environment requirements for vortex flowmeter:
1. Try to avoid strong electrical equipment, high-frequency equipment, and strong switching power supply equipment as much as possible. The power supply of the instrument should be separated from these devices as much as possible.
2. Avoid direct effects of high temperature heat sources and radiation sources. If installation is necessary, insulation and ventilation measures must be taken.
3. Avoid high humidity and highly corrosive gas environments. If installation is necessary, ventilation measures must be taken.
4. Vortex flow meters should be avoided from being installed on pipelines with strong vibrations as much as possible. If installation is necessary, pipeline fastening devices must be installed at 2D upstream and downstream locations, and anti vibration pads must be added to enhance the anti vibration effect.
5. The instrument should be installed indoors, and attention should be paid to waterproofing when installing outdoors. Special attention should be paid to bending the cable into a U-shape at the electrical interface to prevent water from entering the amplifier housing along the cable. There should be ample space around the instrument installation point for wiring installation and regular maintenance.
Huayun Instrument After sales Service:
1. Our company is responsible for free repair of products that have quality problems (not caused by human factors) within one year.
2. If there are any quality problems with our company's products during the warranty period, our company is responsible for free repair or replacement.
3. If the product is damaged due to improper use by the user during the warranty period, our company is responsible for repairing it and charging the cost of the damaged parts.
4. If the user requires on-site service from our company, we will arrive at the user's site in a short time.
5. The products sold by our company enjoy lifelong maintenance.
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HY-LWQ natural gas turbine flowmeter is made of stainless steel material, with LCD integrated display of instantaneous flow rate, cumulative flow rate, pressure value, temperature value, high measurement accuracy, low starting flow rate, small pressure loss, not easy to corrode, good reliability, long service life, flange installation, dual power supply of lithium battery, easy installation and maintenance! Gas turbine flowmeter (natural gas trade settlement flowmeter)
The natural gas turbine flowmeter is a new type of velocity instrument, which is an ideal gas flow detection instrument for gas metering in industries such as petroleum, chemical, power, metallurgy, and industrial boilers, as well as for measuring the volume flow and total amount of low viscosity gases in closed pipelines of urban natural gas and gas pressure regulating stations, and for gas thermal metering. Temperature and pressure compensation gas turbine flowmeter, equipped with dual power supply (24V+battery power supply) as standard, with 4-20mA output.
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I. Overview HY-LWQ is a new generation of high-precision and high reliability gas precision measuring instrument that has been independently developed by absorbing advanced technology of flow meters at home and abroad, optimized and designed, and integrating theories of gas mechanics, fluid mechanics, electromagnetics, etc. It has excellent low-pressure and high-pressure measuring performance, multiple signal output modes, and low sensitivity to fluid disturbances. It is widely used for measuring gases such as natural gas, coal to gas, liquefied gas, and light hydrocarbon gas.
3、 Measurement range and working pressure: Table 1
4、 Measurement range and working pressure: Table 2 (Note: The measurement range shown in Table 2 is the flow range under working conditions)
5、 Selection of gas turbine flowmeter instruments 1. Selection instructions When selecting a flow meter, users should choose the appropriate model and specifications based on the nominal pressure of the pipeline, high pressure of the medium, medium temperature, medium composition, flow range, and signal output requirements. In order to improve the performance of the flowmeter, the flow range of the flowmeter should be within the Qmax range of (20% to 80%), which is more appropriate. 2. Selection Chart
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Selection of Compressed Air Flow Meter:
Compressed air is the primary secondary power source for enterprises and institutions, and most of the petroleum electricity or heat energy is converted through compressors. The primary focus of compressed air flow measurement is to strengthen the management of power conversion, save power, and improve the level of equipment management in enterprises and institutions undergoing structural reform.
There are some difficulties and doubts in measuring compressed air flow, and dealing with these difficulties is the key to measuring compressed air flow.
1. High vibration
In some working conditions, the flow meter device on site is located in the compression plant and blower room. Extreme oscillations can be transmitted to distant places through air pipelines or ducts, causing the lever type differential pressure transmitter fulcrum to move, causing the flow meter to drift and resulting in significantly higher flow readings.
2. Water in the air
Compressed air is taken from the atmosphere, which is somewhat rich in a certain amount of water vapor. In rainy or foggy weather, when the partial pressure of water vapor in the outdoor atmosphere reaches a saturation level, we compress the atmosphere. It is appropriate to compress the sponge filled with water in the same way, and as the volume decreases, an appropriate amount of water will be separated. In a favorable climate, the atmospheric humidity is relatively low, but as it is compressed, the partial pressure of water vapor will increase accordingly, and water droplets may also be separated.
3. Contains pulsating flow
The outlet fluid of compressors and blowers mostly includes a certain pulsating flow, and on site we can see significant fluctuations in the outlet pressure of compressors and blowers. This pulsating flow can cause the readings of vortex flowmeters and differential pressure flowmeters to be higher, resulting in the float in the metal tube float flowmeter shaking up and down. The two commonly used methods to eliminate and weaken the impact of pulsating flow on flow meters are to install a buffer at the outlet of the compressor and place the flow meter behind the buffer or at the location of the principle pulsating flow.
Due to the above difficulties in measuring compressed air flow rate, there are not many external devices that can measure compressed air flow rate in practical applications. The primary ones are vortex flowmeters, differential pressure flowmeters, and thermal gas mass flowmeters. Next, let's talk about the question of measuring compressed air with a vortex flowmeter.
The VNLUGB type compressed air flow meter is used to measure compressed air flow using vortex flow meters. Its significant advantage is that in situations where there is no sensation or significant sensation, the use of VNLUGB type compressed air flow meters results in low pressure loss, high temperature, wide scale, and low protection. The flaw is that it cannot be used in places where there is a big sensation.
Function Introduction of VNLUGB Compressed Air Flow Meter:
1. The on-site LCD display shows real-time temperature, real-time pressure, instantaneous flow rate, and cumulative flow rate;
2. It can be compensated with temperature and pressure to ensure the stability of the appearance;
3. Through multi-point linearization compensation, ensure the flow accuracy of the flowmeter in each range segment;
4. It has the function of self diagnosis and active compensation for temperature and pressure problems, and records the clock and date when the power is cut off;
5. The range ratio can reach 1:15, with a lower flow rate of 4m/s;
6. Three wires output two currents (m, frequency signal) together, and two wires output one current.
Technical parameters of VNLUGB compressed air flowmeter:
Caliber: DN15~DN3000mm
Nominal pressure: 0.6-42MPa
Operating temperature: -180~+350 ℃
Accuracy: ± 1.0% FS
Shell: Carbon steel; Stainless steel (or supplied upon user request) (lined with fluorine)
Power supply method: Built in 3.6VDC lithium battery (changed every two years); External supply 24VDC (optional)
Connection methods: flange pipe type, flange piercing type, flange clamp type
Practical application of VNLUGB compressed air flowmeter:
Pipe diameter: DN50
Apply pressure of 0.8MPa
Medium temperature: room temperature
Power supply method: 24VDC
Connection method: flange clamp type
Shell material: 304 stainless steel
Flow rate: 300m3/h
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