Micro flow meters for Low Flow Indicating is a big challenge for the manufacturing industry. The smaller the flow, the more difficult the measurement.

Commonly used Micro flow meters for low flow liquid flow rate include positive displacement/oval gear, mass flow meter, and ultrasonic flow meter.

Featured Micro flow meters for Sale

Further reading: Industrial LPG/Propane flow meter

A Microflow meter is also called a microfluidic flow meter or a low flow meter. The Micro flow meters we are going to discuss here mainly include gear flow meters, turbine flow meters, ultrasonic flow meters, and mass flow meters.

How to choose a suitable Microflow meter depends on your actual measurement requirements. Let us analyze it together.

Ultrasonic flow meter for Micro flow

Ultrasonic flow meter for Micro flow

Strap on flow meter X3 is a kind of ultrasonic external clamp-on flow meter. Strap on flow meter X3 is easy to install. Suitable for measuring pipe diameter Φ9.53~Φ90.

Product	Strap on Flow meter
Model	X3
Flow range	0.1m/s~5.0m/s
Accuracy	±2.0%
Repeatability	0.80%
Pipe size	φ6.35~φ90
Data storage	Daily, monthly, and Annual. Flow Totalizer
Analog output	4~20mA, Maximum load: 600Ω
Alarm output	DCT, Upper and lower limit alarm function(optional)
Communication	RS485,support Modbus communication protocol
Power supply	24VDC
Cable length	2.0m
Keypad	Four light touch buttons
Screen	OLED 128*64 displayscreen
Units	Metric and imperial units are available, Cubic Meters(m3), Liters(L), USA Gallons(GAL)/hour,/min,Default unit setting:m3/h
Totalizer	Six bit digit
Piper material	Stainless steel pipe, carbon steel pipe, copper pipe, plastic pipe
Case material	Aluminum alloy
Environment temp.	0℃~50℃（32°F~122°F)
Medium temp.	0℃~50℃（32°F~122°F)
Environment humidit	0-95% relative humidity, without condensation
IP Grade	IP54

Turbine Micro flow meter

Turbine Micro flow meter

The micro flow meter is a special flow meter designed to measure the micro flow using the turbine principle. It has extremely high accuracy, especially under high temperature and high pressure conditions. Due to the smart structure design, no precipitation will be formed during work, so the work of the instrument is completely “clean”.

Material	Shell: brass nickel plated/brass/plastic Bearing: INO×18/8 (1.4305) stainless steel Impeller: PVDF (polyvinylidene fluoride) Magnet: SrFeO ceramic, ultrasonic welding
seal	MVQ (silicone rubber “O” ring)
temperature range	-10℃~+100℃
Accuracy class	±2%
Repeatability	±0.20%
Pressure range	Maximum 2MPa
Installation method	Horizontal installation
Dimensions (L×B×H)	40×55×40mm
connection	MPM connector
Provide power	4.5~24VDC
Output	Open collector
Maximum (extra) voltage output	25VDC
Maximum current output	25mA
Thread	G1/8 or G1/4

Know more about: Turbine type Flow Meter

Micro motion flow meter

Micro motion flow meter

Micro Motion Coriolis Flow Meter is a flow meter made according to the Coriolis acceleration theory. Z-Series Straight Tube Micro Motion Coriolis Flow Meter simultaneously measures mass flow, density, temperature and viscosity.

Liquid Accuracy / Repeatability	up to ±0.2± of rate (up to ±0.1± of rate)
Gas Accuracy / Repeatability	±0.20± of rate
Density Accuracy / Repeatability	±0.002 g/cm3 (±0.0005 g/cm3)
Line Size	1/4″ (DN8) – 2″ (DN50)
Pressure Range	up to 1450 psig (100 barg)
Temperature Range	-60 to 300 F (-51 to 149 C)

How does micro motion flow meter work?

The micro-motion mass flowmeter is a flowmeter made according to the Coriolis acceleration theory. There is a straight tube that rotates in a plane around a fixed axis O at an angular velocity w, and a particle in the tube moves outwards along the straight tube at a speed v. Because The mass point m is in a system with both rotational motion and linear motion, so it will obtain two accelerations.

Serving size:

① Centripetal acceleration a, its value is rw^2 (r is the distance from the particle m to the axis O), and the direction points to the axis O.
② Tangential acceleration ac, its value is 2uw. The direction is perpendicular to a, it comes from the rotating pipe. At the same time it produces a reaction force to the pipe. This reaction force is the Coriolis force. Its calculation formula is:

F=2muw —————-(3-8)

Where:
F is Coriolis force, N;
w is the angular velocity, 1/s;
u is the radial velocity in the rotating system, m/s,
m is the mass of the moving object, kg.

If the density of the fluid is p, the tangential Coriolis force on any section of pipe △x is:

△F=2pA△xuw ———(3~9)

Where:
A is the cross-sectional area of ​​the pipe.

In the formula (3-9), pAu is the natural flow rate of the fluid, set as QM’, then the formula (3-9) can be expressed as:

△F= 2w△xQm————-(3-10)

From the above equation, we can know the mass flow Qm as long as the Coriolis force △F is measured. This is the measuring principle of micro-motion mass flowmeter.

Extended reading: U-series Liquid Mass Flow Meter | Liquid-slurry flow measure

Gear flow meter for Micro Flow

Gear flow meter for Micro Flow

Micro Flow Meter is a micro oval gear flow meter. DN4-DN10. Suitable for flow measurement of various low-flow liquids.

Micro Flow Meter has strong adaptability to the viscosity of the liquid to be measured. There is no special Especially suitable for automobile fuel consumption, boiler fuel, medicine, food, chemical raw materials, wine, milk, vegetable oil cans Accurate measurement of small flow rates of various liquids.

Diameter (mm)	Flow Range（L/H）
4	1-100
6	2-200
8	50-500
10	100-1000

Extended reading: Turbine Insertion Flow Meter for Large Diameter Pipeline

Of course, if the medium you need to measure is not a small flow rate. Then you can consider using other types of flow meters.

For example, if you need to measure the wastewater flow of a 2-inch pipe, then you can refer to Magnetic Flow Meters Guides.

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Extended reading:
What is the K-factor in a flow meter?
Cryogenic Flow Meters|Liquid Nitrogen-Liquid Oxygen-LNG fluids

Sino-Inst, Manufacturer for Microflow meters for low flow liquids. For example crude oil flow meter, diesel flow meter, gasoline flowmeter.

Sino-Inst’s Microflow meters for low flow liquids, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

Clamp on flow meters refers to the non-contact flow meter, or strap-on flow meters, which clamps the ultrasonic sensor outside the pipeline for measurement.

Clamp on flow meters installs the sensor clamp outside the pipe. No changes to the pipeline are required. The measurement is simple and flexible. Used for small to large pipe diameters. Clamp on flow meters can be installed permanently, or portable, hand-held, etc.

Best clamp-on flow meters for sale

Clamp On flow sensor for clamp-on flow meters

• With powerful magnets, when measuring steel pipes and cast iron pipes, you only need to attach the sensor to the outer wall of the pipe.
• High temperature sensor with high temperature resistant strong magnet, when measuring steel pipe and cast iron pipe, only need to attach the sensor to the outer wall of the pipeline.
• Equipped with a ground wire terminal, it can be used in occasions with strong electromagnetic interference.
• It can be fixed by steel belt, steel wire rope, tension belt and special clamp.
• The upper cover of the sensor marked the emission direction of the ultrasonic signal.
• After the junction box is filled with glue, the protection level can reach IP68.
• Complete specifications, divided into three types of large, medium and small, measuring pipe diameter range DN15~DN6000mm, temperature range: -40~90℃. -40~160℃.
• According to different uses, standard clamp-on sensors are divided into two categories: portable and fixed.

Types	Picture	Spec.	Model	Measurement Range	Temperature	Dimension
Clamp on		Small Size	TS-2	DN15~DN100	-30~90℃	45×25×32mm
		Medium Size	TM-1	DN50~DN700	-30~90℃	64×39×44mm
		Large Size	TL-1	DN300~DN6000	-30~90℃	97×54×53mm
High Temperature Clamp on		Small Size	TS-2-HT	DN15~DN100	-30~160℃	45×25×32mm
		Medium Size	TM-1-HT	DN50~DN700	-30~160℃	64×39×44mm
		Large Size	TL-1-HT	DN300~DN6000	-30~160℃	97×54×53mm
Mounting Bracket Clamp on		Small Size	HS	DN15~DN100	-30~90℃	318×59×85mm
		Medium Size	HM	DN50~DN300	-30~90℃	568×59×85mm
		Extended	EB-1	DN300~DN700	-30~90℃	188×59×49mm
High Temperature Mounting Bracket Clamp on		Small Size	HS-HT	DN15~DN100	-30~160℃	318×59×110mm
		Medium Size	HM-HT	DN50~DN300	-30~160℃	568×59×110mm
		Extended	EB-1-HT	DN300~DN700	-30~160℃	188×59×49mm

Extended Reading: Liquid Turbine Flow Meter

Portable Clamp On flow meters

Portable clamp-on flow meters refer to the host form of clamp-on flow meters.

Of course, the host of Clamp-on flow meters can be portable, hand-held, and permanently fixed.

A handheld ultrasonic flow meter realizes the non-contact measurement of liquid flow. Also often referred to as Portable Clamp-On Ultrasonic Flow Meter for Liquids.

Handheld Ultrasonic Flow Meter ( Model:2000H) has been successfully applied to measurement work in various industries. The measuring range is 20-6000mm (0.5-20 inches). A non-contact measurement method is adopted. Flexible operation and easy to carry. Conductive or non-conductive, corrosive or non-corrosive liquids can be measured. Various fluids: water, pure water, sewage, seawater, chemical fluids, river water, fuel Oil, etc. can be measured.

Handheld Ultrasonic Flow Meter Reference price: USD 470.00/pc

Read more about Digital Water Flow Meters

New Strap on flow meter X3

Strap-on flow meter X3 is a kind of ultrasonic external clamp-on flow meter. Strap on flow meter X3 is easy to install. Suitable for measuring pipe diameter Φ9.53~Φ90.

Strap on flow meter X3 can meet the needs of different pipe materials: stainless steel pipe, carbon steel pipe, copper pipe, plastic pipe, PVC, PVDF, PPH, PPE, etc.

Strap on flow meter X3 almost meets the measurement of different clean fluids: various acids, alcohols, chemical solvents, alcohol, drinking water, Coca-Cola water… etc.

Read more about: what is gpm;

Clamp On flow meters for water

Advantages of Clamp-on flow meters to measure water:

1. This is the most obvious difference between the clamp-on ultrasonic flowmeter and the electromagnetic flowmeter. The clamp-on ultrasonic flowmeter is not affected by the conductivity of the fluid. It can accurately measure pure water or other fluids with low conductivity that cannot be measured by electromagnetic flowmeters.
2. The accuracy of the clamp-on ultrasonic flowmeter fully meets the measurement requirements. The accuracy is usually ±1%, and ±0.5% after correction.
3. The external clamp ultrasonic flowmeter has a measuring probe outside the pipe wall. It is tightly connected to the pipe wall through a coupling agent. It is not in direct contact with the measured medium. There is no baffle, and its operating life can be well guaranteed.
4. Strong anti-interference ability. The power supply has a wide range to meet the needs of the site.
5. The external clamp type ultrasonic flowmeter is also very convenient to install. Just install the external clamp sensor on the outer pipe to avoid cutting off the pipe and polluting the demineralized water.

You may like: Digital Flow Meters Guide| Liquid and Gas

Clamp-on flow meter for gas

The gas ultrasonic flowmeter can not only measure high-pressure gas, but also measure atmospheric gas, including gas in steel pipe, which was a worldwide technical problem before.

For example air, argon, carbon monoxide, ethane, ethylene, helium, hydrogen, natural gas, nitrogen, nitrous oxide, oxygen, process gas, propane, saturated steam, acid gas, etc.

You may like:

Sino-Inst, Manufacturer for Ultrasonic Flow Meters. It can measure a single sound-conducting liquid medium of DN 15—6000mm. It can measure even liquids such as water, seawater, oil, and slurry.

Sino-Inst’s Ultrasonic Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

Refrigerant flow meter is used for common liquid and gas refrigerant flow measurement.

There are more than 80 kinds of substances that can be used as refrigerants, the most commonly used are ammonia, freons, water and a few hydrocarbons. Accurate measurement of refrigerant flow can effectively control production and save production costs.

Featured Refrigerant Flow Meters for Sale

Common industrial refrigerants

1. Water

Using water as a refrigerant is a low-cost solution that is completely non-toxic, easily available and environmentally friendly. Read more about: Digital Water Flow Meters

2. R134A Hydrofluorocarbon

This is a hydrofluorocarbon (HFC) and haloalkane refrigerant, commonly known as halothane or Freon 134A. As a refrigerant, it has completely stable thermal characteristics, low toxicity, non-corrosiveness and non-flammability. It is widely used in automobile air-conditioning units and industrial chillers.

3. R744 carbon dioxide
   The use of carbon dioxide as a refrigerant is advantageous because it is non-flammable and non-toxic.
4. R717 ammonia

Ammonia (R717) is a refrigerant and is a halogen-free chemical. This is the most commonly used refrigerant in chillers. It has the highest heat absorption rating, which makes it ideal for use in small portable chillers without the need for large cooling equipment.

5. HCFC

This is a group of refrigerants composed of HCFC compounds. They have a high GWP and are very toxic. Examples of refrigerator refrigerant types in this group include R2, R123, R124, and R151.

6. HCS

Hydrocarbons are another refrigerant used in domestic and industrial refrigeration. Common refrigerant hydrocarbons are R600A (isobutylene) and R290 (propane).

These refrigerant types are highly flammable and therefore require careful special installation. As we all know, propane has no potential for ozone depletion, so it is suitable for environmentally friendly industrial chillers.

7. 407C Rand

The combination of hydrofluorocarbon difluoromethane (R32), pentafluoroethane (R125) and 1,1,1,2-tetrafluoroethane (R134A) will respectively provide heat, reduce flammability and reduce pressure. This refrigerant is considered to be the most suitable substitute for the R-22 refrigerant system, which will be phased out in 2020.

8. R404A

If the cooling process requires medium and low temperature refrigerants, R404A should be considered. This is a mixture of hydrocarbons that can be used in various commercial environments, such as supermarkets and cold storage rooms.

9. R410A type

For general air conditioners, R410A is an azeotropic mixture of hydrofluorocarbons that can be used. It has no harmful effect on the ozone layer. With the phasing out of R22 refrigerant, it has become more and more popular.

10. R448A type

This is a non-flammable HFC mixture used to replace R22 and R404A in domestic and commercial refrigeration systems. It is toxic and requires careful handling, installation and storage.

11. R449A type

R449A is another HFC mixture with similar composition to R448A. It is used as a substitute for R404A and R507A refrigerants in medium and low temperature applications.

One of the main advantages of R449A is that it can be easily retrofitted in old refrigeration systems or installed in newer models. Another advantage is its environmental friendliness and low GWP.

You may like: Digital Flow Meters Guide| Liquid and Gas

Liquid Refrigerant Flow Meter

Gear flow meter is a micro digital positive displacement flow meter. Can measure very small flow rates and quantify small volumes of liquid. High and low temperature resistance (-196℃-200℃).

The Gear flow meter for Micro flow is made of stainless steel and is used for precise continuous or intermittent measurement of the flow or instantaneous flow of liquid. It is especially suitable for the flow measurement of heavy oil, polyvinyl alcohol, grease and other high-viscosity media. It can measure the viscosity Fluids up to 10000Pa.s.

Read more about: Flow Unit Conversion Table

Mass Refrigerant Flow Meter

Mass flow meter directly measures the mass flow of the medium passing through the flow meter. It can also measure the density, temperature and viscosity of the medium

Mass flow meter is a flow measuring instrument that measures the mass flow in the pipeline. The volume of a fluid is a function of fluid temperature and pressure and is a dependent variable. The quality of a fluid is a quantity that does not change with time, space temperature, and pressure.

You may like:

Sino-Inst, Manufacuturer for Refrigerant Flow Meters. For example: Ammonia, Freon-12, Freon-22, R134, R22.

Sino-Inst’s Refrigerant Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

How to choose a Hydrogen flow meter? Hydrogen is a valuable and widely measured industrial gas. Custody transfer metering is a very important feature of hydrogen flow measurement.

Common gas flow meters include thermal mass flow meters, vortex flow meters, precession vortex flow meters, and gas ultrasonic flow meters. How to select a hydrogen flow meter? Next, we will discuss in detail.

Characteristics of hydrogen

Hydrogen (chemical formula H2) consists of two hydrogen atoms, which is colorless, tasteless, odorless, non-toxic, and flammable. With a molecular weight of 2, and a specific gravity of 0.0695, hydrogen is considered the lightest gas, more than 14 times lighter than air (mv=28.8).

Hydrogen is very flammable. Under normal pressure, a mixture with a hydrogen content of 4.0% to 74% can be flammable. Since the minimum ignition energy of hydrogen (0.02mJ—one order of magnitude smaller than the minimum ignition energy of hydrocarbons) is very small, strict precautions must be taken to prevent leakage.

The most preferred hydrogen flow meter

Thermal Mass Flow Meter can directly measure the mass flow of various gases. Unaffected by changes in viscosity, density, temperature, or pressure.

Thermal Mass Flow Meter is a true mass flow meter. No temperature and pressure compensation is required. Thermal gas mass flow meters are designed based on the principle of thermal diffusion. Including natural gas, coal gas, liquefied gas, flare gas, argon, carbon dioxide and other mixed gas flow measurement.

Extended reading: Gas Mass Flow Meter

Mass flow measurement of hydrogen

At present, the Coriolis mass flowmeter and thermal gas mass flowmeter are the most reliable and the most reliable hydrogen flow measurement applications. Both of these are flow meters for direct mass flow measurement, and neither have movable parts and have a large range. The fluid contact surface is made of 316L, which improves the durability and safety of field application.

The sensors of Coriolis mass flowmeter and thermal gas mass flowmeter are all welded. Because the pressure sensor interface and temperature sensor are not required to correct the flow reading to the volume flow under the standard state. Therefore, the system pipe joint used Be reduced to a minimum.

The sensor connection method has flange connection, flange to clamp connection, thermal gas mass flowmeter can also provide large pipeline plug-in connection.

Coriolis mass flowmeters and thermal gas mass flowmeters can provide up to 0.5% accuracy due to their excellent detection technology, which has huge advantages in trade settlement and measurement.

These two types of flow meters have advanced measurement technology, good long-term application stability, and extremely low on-site maintenance costs. They are very popular measuring instruments.

The shortcomings of Coriolis mass flow meters: large pipe diameters are bulky, inconvenient to install, and extremely expensive to purchase. It is inferior to the thermal gas mass flowmeter in the small flow measurement characteristics.

Disadvantages of thermal gas mass flow meters: the high flow rate range is not as good as Coriolis mass flow meters. In order to accurately measure the hydrogen flow rate, it is necessary to use real flow calibration for the flow meter calibration.

Gas Thermal Mass Flow Meter

 Coriolis Flow Meter

Hydrogen flow meter—Precession Vortex Gas Flowmeter

Precession vortex flowmeter is a new type of gas flowmeter. It can be used for the measurement of natural gas, propane, air, nitrogen and other gases.

Precession Vortex Gas Flowmeter, like vortex flowmeter, is a velocity flowmeter. The cost performance of the intelligent precession vortex flowmeter is higher than vortex flowmeter. The intelligent precession vortex flowmeter can only measure gas. Precession Vortex Gas Flowmeter can be made into an integrated temperature and pressure compensation. And can measure various gases. Such as compressed air, oxygen, biogas, natural gas, coal gas, etc.

Precession Vortex Gas Flowmeter reference price: DN50, USD 600.00/pc.

Guess you like: Industrial Oxygen Flow Meters

More Featured gas flow meters

A gas flow meter is an instrument for measuring the flow of gas. Installed in the pipeline to record the amount of gas flowing through.

Can measure blast furnace gas, coke oven gas, coal gas, air, nitrogen, acetylene, phosgene, hydrogen, natural gas, nitrogen, liquefied petroleum gas, hydrogen peroxide, flue gas, methane, butane, chlorine, gas, biogas, carbon dioxide , Oxygen, compressed air, argon, toluene, benzene, xylene, hydrogen sulfide, sulfur dioxide, ammonia, etc.

Read more about: Types of biogas flow meters

There are mainly the following types of gas flow meters:

1. Vortex flowmeter:

It is mainly used for flow measurement of industrial pipeline medium fluid, such as gas, liquid, vapor and other media. Its characteristics are small pressure loss, large measuring range and high accuracy.

When measuring the volume flow under working conditions, it is hardly affected by the fluid density, pressure, temperature, viscosity and other parameters. There are no movable mechanical parts, so the reliability is high and the maintenance is small. The instrument parameters can be stable for a long time.

2. Gas turbine flowmeter:

The gas turbine flowmeter is a new generation of high-precision and high-reliability gas precision metering instrument developed by itself by absorbing the advanced technology of domestic and foreign flow meters, optimized design, and integrated theories of gas mechanics, fluid mechanics, and electromagnetics.

With excellent low and high pressure metering performance, multiple signal output methods and low sensitivity to fluid disturbances, it is widely applicable to the metering of natural gas, coal-based gas, liquefied gas, light hydrocarbon gas and other gases.

Extended reading: Buy Digital Gas Flow Meters & Controllers For Air-O2-N2-CO2

3. Integrated orifice flowmeter:

It is a high-range ratio differential pressure flow device that is composed of a standard orifice plate and a multi-parameter differential pressure transmitter (or a differential pressure transmitter, a temperature transmitter, and a pressure transmitter).

It can measure the flow of gas, steam, liquid and natural gas, and is widely used in process control and measurement in the fields of petroleum, chemical industry, metallurgy, electric power, heating, and water supply.

4. V cone flowmeter:

V-cone flowmeter is widely used in petrochemical, natural gas and other fields due to its simple structure, firmness, easy duplication, strong versatility, and low price.

This product overcomes the standard orifice plate, venturi tube, nozzle and other throttling devices, such as easy to wear, large pressure loss, small range (range ratio), high on-site installation conditions, and excessively long straight pipe sections. It can accurately measure the flow rate of various fluids in a wide range of Reynolds number.

Guess you like: Gas Mass Flow Meter

Why should you never measure hydrogen and oxygen together with a flow meter?

Because hydrogen is a flammable gas. Oxygen is a necessary condition for combustion. Measure if oxygen and hydrogen are mixed. It is easy to explode.

Therefore, when we choose a hydrogen flowmeter, we must remember to choose an explosion-proof flowmeter!

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Sino-Inst offer over 5 Hydrogen flow meters with Best Price.

A wide variety of Hydrogen flow meters options are available to you, such as free samples, paid samples.

Sino-Inst is Hydrogen flow meters suppliers, located in China. Mass Flow Meters products are most popular in North America, Mid East, and Eastern Europe. The United States, and India, which export 99%, 1%, and 1% of Hydrogen flow meters respectively.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

Hot Water Flow Meters Improve Heating-Boiler System

Hot water flow meters refer to flow meters that can measure and indicate the flow of high temperature water. Hot water is widely used in industry and civil use. Such as heating systems, baths, boilers, industrial indirect heating, heat transfer, etc. There are many types of water flow meters. Some of the most common types include electromagnetic flow meters, turbine flow meters, and vortex flow meters. These meter types have unique features that distinguish them from each other. According to the function of the hot water flow transmitter and the user’s budget. You can choose a suitable flow meter to monitor the hot water pipeline.

RFQ More Flowmeters

Features of Hot Water Flow Measurement

What are the characteristics of hot water flow measurement? Let’s take a look.

1. The temperature of the measured fluid is not very high. When the flow meter is installed at the entrance of the heat exchanger body. The temperature of the fluid is generally not higher than 140°C. When the liquid outlet of the heat exchanger is installed, the flow temperature is lower.
2. The measured fluid pressure is not very good either. In order to send hot water to the highest floor in the building heating system, the pressure is sometimes higher. In the ground heating system, the highest pressure is 1MPa.
3. The pipe diameters vary in size. The smallest user, the pipe diameter is only DN20~DN40. The large-diameter flowmeter sometimes reaches about 1m.
4. Better cleanliness. Hot water is not as clean as tap water. The solid matter in the single water and its viscosity will not have a big impact on the general flowmeter.
5. Corrosive. Fresh water does not corrode the flowmeter. However, geothermal water has a certain degree of corrosion. Because it contains chloride ions and so on. Ordinary stainless steel materials are corroded, and the higher the fluid temperature, the more severe the corrosion.
6. The requirement for scope is not high. The pumps used in power plants (stations) to deliver hot water are generally combined in size. When the hot water supply is at its maximum, usually several large pumps are opened. When the heat supply is the smallest, generally only a small pump is turned on. The ratio of the maximum flow rate to the minimum flow rate is about 5~10. A flow meter for heat measurement of a single user. In the heating season, the flow measurement range of up to 10 can meet the demand. After the hot water valve is turned off, the market value of the flow should be 0.

Extended Reading: Insertion Flowmeter Types

Hot Water Flow Meter Types

Hot water is the most widely used heat carrier liquid. Due to the difference in use and design, the water supply temperature is commonly used in several grades such as 60℃, 90℃, and 130℃. There are fresh water and geothermal water in the varieties of water. The temperature of geothermal water cannot be determined independently, but it must be above 60°C to have use-value. Flow Meter Selection Guide 101: Find the Perfect Fit for Your Application

Extended Reading: Chilled Water Flow Meter

Hot Water Flow Meter Specifications

Extended reading: Quantitative control with turbine flowmeter

Hot Water Flow Meter with Pulse Output

Commonly used flow meters have three forms: current output, voltage output, and pulse output.

Among them, the current output and the voltage output signal of the instrument are in line with the International Electrotechnical Commission (IEC) standard. There is currently no standard for the pulse output signal of the instrument.

The flowmeter with pulse output, its output is a pulse signal proportional to the flow rate. Compared with the analog signal of voltage and current, the pulse signal is convenient for remote transmission without reducing the accuracy, and there is no zero drift. It is easy to connect with the computer, easy to carry out cumulative display and has a strong anti-interference ability.

Extended reading: Ultrasonic Water Meter for Residential Water

Water Flow Meter Types

There are many types of flow meters for measuring water.

Common ones are V cone flowmeter, electromagnetic flowmeter, metal rotor flowmeter, vortex flowmeter, liquid turbine flowmeter, ultrasonic open channel flowmeter, ultrasonic flowmeter, etc.

At present, electromagnetic flowmeters and turbine/vortex can solve most of the working conditions.

More about:

Featured Digital Water Flow Meter

Extended Reading: Inline Ultrasonic Flow Meter

Hot Water Flow Meter Price

Sino-Inst offers over 30 water flow meter products. About 50% of these are differential pressure flow meters. 40% are water meters (like the Insertion Turbine Flow Meter), and 40% are water treatment (like the Annubar flow meter ).

A wide variety of water flow meter options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of water flow meters, located in China.

The top supplying country is China (Mainland), which supply 100% of the water flow meter respectively.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

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What is Chemical Flow Meter?

Chemical Flow Meter is also known as chemical resistant flow meter. It is a flow meter used to measure common chemical fluid media. In chemical production control and metering, between chemical reaction storage tanks, or chemical raw material feed pipelines.

Sino-Inst offers a wide range of liquid and gas flow meters to help you regulate the flow of water, petroleum products, fuels, chemicals and more.

Get a Quote More Flowmeters

So how do choose the most suitable Chemical Flow Meter? Hope you can find the answer after reading this article.

Featured mechanical & digital flow meter for chemicals

Gear Flow Meter – A New Choice for Chemical Liquids

Gear Flow Meters produced by Sino-Inst has high machining accuracy and precise installation. The rotation of the gear is scanned by non-contact. Each tooth produces a pulse. The resolution is very high. The cylindrical gear transmitter can measure very small flow. Quantitative small volume of liquid.

The new Gear Flow Meter made of PTFE is widely used in the chemical industry and laboratories. 98% nitric acid and sulfuric acid resistant to hydrofluoric acid. It has not been corroded after long-term continuous use.

Gear Flow Meter is suitable for:

• Resin and glue measurement
• Hydraulic oil, lubricating oil, grease measurement
• Fuel oil measurement
• Ink, asphalt measurement
• Liquid nitrogen, freezing liquid, solvent measurement
• Edible oil, fish oil and food filling measurement
• Chemical and anti-corrosion requirements fluid measurement
• Fluid quantitative control system

Extended reading: High-quality hydraulic fluid flow meters

Chemical flow meters types

Types of Flowmeters

The following will explain the flowmeters commonly used in the chemical industry.

1. Electromagnetic flowmeter. When a conductive fluid flows through an electromagnetic field, the velocity of the fluid can be obtained by measuring the voltage. The electromagnetic flowmeter has no moving parts and is not affected by the fluid. The accuracy of measuring conductive liquids when the tube is full is very high. The electromagnetic flowmeter can be used to measure the flow rate of the slurry fluid.
2. DP flowmeter can be used to measure the flow rate of most liquids, gases and steam. Positive displacement flow meter (PD). The PD flowmeter is used to measure the volumetric flow rate of liquid or gas. It introduces the fluid into the measuring space and counts the number of rotations. Impellers, gears, pistons or orifices are used to divert fluids.
3. Vortex flowmeter. The vortex flowmeter is to place a non-streamlined vortex generator in the fluid, and the speed of the vortex is proportional to the speed of the fluid to calculate the volume flow. The vortex flowmeter is suitable for measuring liquid, gas or steam. It has no moving parts and no fouling problem. The vortex flowmeter generates noise and requires the fluid to have a higher flow rate to generate the vortex.
4. Thermal mass flow meter. The fluid velocity is measured by measuring the increase in the temperature of the fluid or the decrease in the thermal sensor.
5. Coriolis flowmeter. This kind of flowmeter uses a vibrating fluid tube to produce a deflection corresponding to the mass flow rate for measurement.
6. Turbine flowmeter. When the fluid flows through the turbine flowmeter, the fluid causes the rotor to rotate. The rotation speed of the rotor is related to the speed of the fluid. From the average flow rate of the fluid felt by the rotor, the flow rate or total amount is derived.
7. Ultrasonic flowmeter. The propagation time method and the Doppler effect method are methods often used in ultrasonic flowmeters to measure the average velocity of the fluid. Like other speed meters, it is a meter that measures volume flow.

chemical magnetic flow meter

Electromagnetic flowmeters can measure the flow of general conductive liquids. It can also measure the volume flow of liquid-solid two-phase flow, liquid with high viscosity, strong acid, strong alkali, and salt liquid medium.

For chemical liquids, as long as they are conductive liquids, electromagnetic flowmeters can measure them.

But we need to choose the appropriate lining and electrode according to the characteristics of the chemical liquid.
You can refer to the liner and electrode material usage table below.

Lining material selection：

Lining material	Linner	Main performance	Application	Diameter
Rubber	Neoprene(CR)	1. It has excellent flexibility. High tearing force. Good wear resistance. 2. Resistant to the corrosion of low-concentration acid, alkali, and salt media. Not resistant to corrosion by oxidizing media.	1. <60℃ 2. General water, sewage, mud and mineral slurry with weak abrasiveness	DN65~DN1600
	Polyurethane Rubber(PU)	1. It has excellent wear resistance (equivalent to ten times that of natural rubber) 2. Poor acid and alkali resistance. 3. It cannot be used for water mixed with organic solvents.	1. <80℃ 2. Neutral and strong abrasion ore slurry, coal slurry, mud, etc.	DN25~DN500
	Silicone rubber	1. It has excellent flexibility. High tearing force. Good wear resistance. 2. High temperature resistant non-corrosive medium.	1. <180℃ 2. Hot water	DN40~DN1600
Fluoroplastics	PTFE(F4)	1. It is a material with the most stable chemical properties in plastics. Can withstand boiling hydrochloric acid, sulfuric acid, nitric acid and aqua regia. It is also resistant to concentrated alkali and various organic solvents. Not resistant to the corrosion of chlorine trifluoride, high temperature oxygen trifluoride, high flow rate liquid fluorine, liquid oxygen, and ozone. 2. Poor wear resistance. 3. Poor anti-negative pressure ability.	1. <120℃ 2. Strong corrosive media such as concentrated acid and alkali 3. Sanitary medium	DN10~DN1600
	Teflon F46(FEP)	1. The chemical properties are equivalent to PTFE 2. Tensile strength and abrasion resistance are better than PTFE 3. Can withstand high pressure resistance.	1. <180℃ 2. Corrosive acid-base salt 3. High pressure and negative pressure resistance	DN10~DN200
	PFA	1. The chemical performance is equivalent to F46 2. Compressive and tensile strength due to F46	1. <180℃ 2. Corrosive acid-base salt 3. High pressure and negative pressure resistance	DN10~DN300

Electrode material selection:

Material	Medium
316L	Domestic water, industrial water, raw water, urban sewage, etc.
Hastelloy B (HB)	Sodium hydroxide ammonium hydroxide alkali solution and weak organic acid
Hastelloy C (HC)	Oxidizing salt solution (Fe+++, Cu++, seawater)
Titanium (Ti)	1. Salt solution (chloride, sodium salt, potassium salt, ammonium salt, sea water, etc.) 2. Alkaline solution (such as concentration less than 50% potassium hydroxide solution)
Tantalum(Ta)	1. Hydrochloric acid, sulfuric acid, oxidizing acid, aqua regia 2. Chlorine dioxide, ferric chloride, hypochlorous acid, sodium cyanide, lead acetate, etc.
Platinum (Pt)	Acid, alkali, salt solution
Tungsten carbide (WC)	Handled neutral industrial sewage and domestic sewage. Resistant to solid particle interference

Guess you will like: Magnetic Flow Meters technical guide|What is &How they work? 

Low Corrosive Chemical Flow Meters

Of course, in addition to electromagnetic flowmeters. To measure acidic media, oval gear flowmeters, vortex flowmeters, and turbine flow sensors made of acid-resistant materials can also be used. The parts in contact with the medium are made of acid-resistant materials, which can resist general acidic substances.

Such fluids include solvents, solutions, ethanol, diesel, and clean water.

Turbine flow meters are less expensive and usually have chemical flow sensors that have a compact design.

These flow meters are volumetric, meaning that they can measure liquids passing through them either indirectly or directly.

Some of the advantages of using turbine flow meters are that they have high accuracy, can measure high pressure, and have a large measuring range.

Corrosive but non-conductive liquid flow meters

When the clamp-on ultrasonic flowmeter is working, the liquid does not directly contact the flowmeter. So it is suitable for various corrosive liquids. But its accuracy rate is relatively low.

Extended reading: Sludge flow meter for sewage treatment return activated sludge system

Commonly used chemical liquid-flowmeter recommendation

Of course, the choice of flowmeter also needs to be determined according to the actual measurement parameters.

More chemical liquid flow measurement solutions

Sino-Inst, Manufacturer for Chemical Flow Meters. These chemical flow meters are easy to use and install on hose ends, pumps or fluid transfer systems. These chemical flow meters are designed for today’s pesticides, fertilizers, and many other chemicals.

Each chemical flow meter has different measurement materials and different measurement characteristics. Compatible with other chemical liquids or oils.

Sino-Inst’s Chemical Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

If you are not sure which chemical flow meter is right for your measurement? Please feel free to contact our sales engineers. Based on years of experience in measuring chemical fluid flow, we will help you find the right chemical flow meter.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

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Karman vortex air flow sensor is a commonly used flow meter for measuring air. Karman vortex air flow sensor is also called vortex shedding flow meter.

There are many types of instruments that can be used to measure air, but the actual air flow rate used in the field is divided according to its principles, and there are not many types. Karman vortex air flow sensor and Mass air flow sensor are two commonly used.
Well.

Which one should you choose?

What is a Karman vortex air flow sensor?

Karman vortex air flow sensor is a volume flow meter.

Karman vortex air flow sensor uses airflow to bypass a cone and generate two rows of vortices downstream. The vortex frequency has a functional relationship with the intake air flow. An instrument that determines the air flow by detecting the frequency of the vortex by optical or ultrasonic methods.

Extended Reading: Digital air flow meters

What is a mass air flow sensor ?

The mass air flow sensor is a mass flow meter. Also called Thermal gas mass flow meters.

Thermal gas mass flow meters are instruments that use the principle of thermal diffusion to measure gas flow. The sensor is composed of two reference thermal resistance (RTD).

Thermal gas mass flow meter can measure air, nitrogen, carbon dioxide, methane, etc.
A single component or a mixture of certain components. The flowmeter is generally verified with ammonia or air as the medium when it leaves the factory.

Guess you like: Gas Mass Flow Meter

Karman vortex air flow sensor VS Mass air flow sensor

Name	Karman vortex	Mass
Appearance
Installation	Flange/Insert	Flange/Insert
Measurement Principle	Through measuring frequency of turbulences behind an obstacle to reflect the velocity of the gas, so measures the actual volume flow of the gas .	Measures the mass flow of the gas via measuring the energy needed to keep a heated resistor at a constant temperature.
Temperature and Pressure Compensation	To calculate the standard volumetric flow , need temperature and pressure compensation . ( Requires temperature and pressure measurement additionally )	There is a fixed relationship between standard flow and mass flow (Be determined by the density of gas under standard condition ) , no need the temperature and pressure compensation.
Sensitivity	No response to the flow less than 4 m/s.	Can measures the flow small to 0 m/s.
Measure Ranges	4-75 m/s	0-224 m/s
Accuracy	±1.5%	±1~2.5%
Main factors affecting measurement accuracy	vibrate(a slight shaking can affect the measuring accuracy a lot)	The cleanliness of the measured gas (No long-term measurement behind the air compressor)
Repair and calibration	Can not install or uninstall under pressure, high cost of repair or calibration.	Can install or uninstall under pressure,low cost of repair or calibration.

Extended reading: Volumetric Flow Rate To Mass Flow Rate

Applicaitons :

The Karman vortex air flow sensor is widely used, gas, liquid, and steam can be measured.

The Mass air flow sensor can only measure gas;

Price:

Karman vortex air flow sensor is much cheaper;

Installation conditions:

The vortex flowmeter has requirements for the installation of the straight pipe section of the measuring pipeline, generally the first 10 and the back 5.

The thermal mass flow meter has no limitation.

Features:

1. Thermal gas mass flow meters have the following technical advantages:

A true mass flow meter does not require temperature and pressure compensation for gas flow measurement. The measurement is convenient and accurate. The gas mass flow or standard volume flow can be obtained.

Wide range ratio, can measure gas with flow rate as high as 120Nm/s and as low as 0.1Nm/s. Can be used for gas leak detection.

Good seismic performance and long service life. The sensor has no moving parts and pressure sensing parts, and is not affected by vibration on measurement accuracy.

Easy to install and maintain. If site conditions permit, installation and maintenance can be achieved without stopping production. (Need special customization)

Digital design. Integral digital circuit measurement, accurate measurement and convenient maintenance.

Using RS-485 communication can realize factory automation and integration.

Oxygen, nitrogen, hydrogen, road gas and multi-component gas measurement.

Blast furnace gas and coke oven gas measurement.

Gas flow measurement for natural gas, liquefied gas, flare gas, etc.

Primary air and secondary air flow measurement of power plant blast furnace.

Flow measurement of underground ventilation or exhaust system in mines.

Flue gas measurement.

Compressed air measurement.

Extended reading: Gas mass flow controller working principle

2. The vortex flowmeter has the following advantages:

The output signal is not affected by the temperature, pressure, and density components of the fluid, and is directly proportional to the fluid flow rate.

The sensing element does not contact the medium and has high reliability.

No moving parts, simple and firm structure.

Wide measuring range and high precision.

The pressure loss is small and the energy saving is significant.

Read more about: Vortex Shedding Flow Meter Working Principle

More Featured Air flow sensors

Extended reading: What is an air pressure transducer?

Sino-Inst’s air flow sensor offer reliable and accurate volume flow measurement in a large range of sizes and pressure rating while being fully compliant with international standards.

Sino-Inst is the risk-free choice for your gas flow measurement applications.

Sino-Inst supplies air flow sensors, like: gas turbine flow meter. vortex flowmeter, thermal mass flow meter, and more. More about Types Of Air Flow Measurement Instruments.

Sino-Inst’s air flow sensors, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

Liquid Turbine Flow Meter is one of the most ideal flow meters for measuring liquids. Liquid Turbine Flow Meter is suitable for measuring low-viscosity media, such as water, diesel, gasoline, etc.

The Liquid Turbine flow sensor can measure the instantaneous flow rate and the total cumulative volume of the liquid, and can also quantitatively control the liquid. Turbine flow meters are velocity flow meters. The principle is to use the relationship between the rotational angular velocity of the impeller placed in the liquid and the liquid flow rate. Calculate the size of the liquid flow by measuring the speed of the impeller. The flow can be displayed on-site and can also be matched with the corresponding flow totalizer.

Featured Liquid Turbine Flow Meters

Types of Turbine Flow Meter

Different measuring medium

According to different measuring media, turbine flow meters can be divided into gas turbine flow meters and liquid turbine flow meters.

Gas turbine flowmeters are significantly different from liquid turbine flowmeters in structure.

You can learn more about gas turbine flow meters.

Different output signal

According to the different output signals, we divide the liquid turbine flowmeter into the following 4 categories.

A. On-site display type

The intelligent flowmeter is a new type of flowmeter display instrument designed with advanced single-chip microcomputer technology, and it is matched with the flow sensor (such as turbine, vortex) with pulse signal output.

• Can display instantaneous flow and cumulative total.
• Cumulative flow: 8 digits, 3 significant digits after the decimal point.
• Instantaneous flow: six digits, can show the change per liter.
• Display accuracy: ±1 display unit.
• Signal output: pulse output: 1~3000Hz
• External power supply +12~+24VDC
• Current output: 4~20mA
• External +24VDC power supply (two-wire system) built-in 2 3V lithium batteries in parallel for power supply.
• When the voltage is lower than 2.7V, there will be an undervoltage indication, explosion-proof type.
• Small signal removal function.

B. Pulse output type

• Working voltage: +12VDC or +24VDC (the customer must select a power supply before ordering).
• Signal transmission distance: less than 250 meters.
• Output signal: square wave signal
• Amplitude: +12VDC power supply amplitude is about 10V +24VDC power supply amplitude is about 20V
• Installation: The connection between amplifier and turbine flow sensor is M16×1.5 thread. After the turbine flow sensor is installed, screw the amplifier to the turbine flow sensor. Tighten the lock nut until you feel the amplifier to the end.
• Wiring: The pulse output type amplifier has three external leads, red wire, white wire and shield. The red wire is connected to the positive power supply, the white wire is the pulse output and other display instruments or equipment, and the shield is grounded.

C. 4～20mA output type

• Working voltage: external power supply +24VDC (two-wire system)
• Output signal: 4~20mA or 1-5V. 4mA corresponds to the zero flow of the turbine flow sensor, and 20mA corresponds to the maximum flow of the turbine flow sensor. See the nameplate of the turbine flow sensor for the flow range.
• Signal transmission distance: less than 250 meters.
• Installation: After the turbine flow sensor is installed, screw the amplifier to the turbine flow sensor connector (m16×1.5 thread). Tighten the lock nut by hand until you feel the amplifier is at the bottom.
• Wiring: The external leads of the 4-20mA output amplifier are red and white wires. The red wire is the power wire and the white wire is the signal wire.

D. Split remote display type

• Working voltage: 220VAC from external power supply
• Signal transmission distance: less than 250 meters
• Instantaneous four digits of the indicator: nine digits for the cumulative total
• Display size: horizontal type: 160mm×80mm vertical type: 80mm×160mm
• Display instrument with 4~20mA output and can be connected with computer

Know more about: Turbine type Flow Meter for Liquid & Gas technology

What liquids can be measured by Liquid Turbine Flow Meters?

In terms of measuring liquid flow, turbine flowmeters should be used in the following areas:

1. Partially corrosive liquid measurement. Such as sulfuric acid, hydrochloric acid, nitric acid, acetic acid and other acids and various chemical solutions.
2. Flow measurement of various industrial water. Including recycled water, waste water and waste liquid in various production processes in chemical, light industry, electric power, metallurgy, building materials, petroleum and other industries.
3. Partial low viscosity oil flow measurement. Such as gasoline, kerosene, diesel, and heavy oil and residual oil whose viscosity is reduced by heating.
4. Water flow measurement in large-diameter pipes, of which the full-pipe turbine flowmeter is mainly used for small and medium pipe diameters. The plug-in turbine flowmeter can be used for large pipe diameter (DN≥300mm) pipeline flow measurement. It is widely used in urban water pipelines and industrial water main lines of enterprises such as chemical industry, electric power, metallurgy, papermaking, and chemical fiber.
5. Measurement of non-conductive liquids. If it is said that electromagnetic flowmeters dominate the flow measurement of conductive liquids. In the field of non-conductive liquid flow measurement, electromagnetic flowmeters are powerless. The turbine flowmeter is very useful. Turbine flowmeters with small diameters introduced in recent years are more suitable for applications in this field.
6. Some turbine flowmeter products use a compression molding process to make the turbine flowmeter sensor into an all-plastic product. Then configure a non-contact ultrasonic detection element to measure the liquid without contact. It can be used for flow measurement of corrosive liquids and high purity liquids.
7. According to relevant information, in the petrochemical, pharmaceutical, food and semiconductor industries, turbine flowmeters have obtained fruitful applications. For example: methanol, formaldehyde, acetone, toluene, trichloroethylene, ethylene, butane liquid ammonia, etc. There are also pure water for the semiconductor industry, ultra-clean pure water and so on.

Turbine Flow Meter Application Case: Demineralized Water.

In fact, if your measuring medium is conductive liquid, or corrosive conductive liquid, or wastewater. It’s better consider using an electromagnetic flowmeter. Let’s take a quick look.

Extended reading: Turbine Flow meter Vs Gear Flow meter

Turbine flow meter Advantages and Disadvantages

Gas Turbine Flow Meter Working Principle

The gas turbine flowmeter uses a turbine for measurement. It first converts the flow rate into the rotational speed of the turbine, and then converts the rotational speed into an electrical signal proportional to the flow rate.

Gas turbine flowmeter is used to detect instantaneous flow and total integrated flow. Its output signal is frequency, which is easy to digitize.

The induction coil and the permanent magnet are fixed on the housing together. When the ferromagnetic turbine blade passes the magnet, the reluctance of the magnetic circuit changes, thereby generating an induction signal.

The signal is amplified and reshaped by the amplifier and sent to the counter or frequency meter. The total accumulated flow is displayed. At the same time, the pulse frequency undergoes frequency-voltage conversion to indicate instantaneous flow.

The speed of the impeller is proportional to the flow, and the number of revolutions of the impeller is proportional to the total amount of flow. The output of the turbine flowmeter is a frequency modulated signal. It not only improves the anti-interference of the detection circuit, but also simplifies the flow detection system.

The gas turbine flowmeter has a turndown ratio of up to 10:1, and the accuracy is within ±0.2%. The time constant of the turbine flowmeter with small inertia and small size can reach 0.01 second.

Liquid Turbine Flow Meter Working Principle

Liquid Turbine Flow Meter is a speed type flow meter based on the principle of torque balance.

The fluid flows through the sensor housing. Because the blades of the impeller have a certain angle with the flow direction. The impulse of the fluid makes the blades have a rotational torque. After the friction torque and fluid resistance are overcome, the blades rotate. The speed is stable after the torque is balanced.

Under certain conditions, the speed is proportional to the flow rate.

Due to the magnetic permeability of the blade, it is in the magnetic field of the signal detector (composed of permanent magnets and coils). The rotating blade cuts the magnetic lines of force. The magnetic flux of the coil is periodically changed. Electrical pulse signals are induced at both ends of the coil.

This signal is amplified and reshaped by an amplifier. A continuous rectangular pulse wave with a certain amplitude is formed. It can be transmitted to the display instrument remotely. The instantaneous flow or total amount of the fluid is displayed.

Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow Q of the fluid flowing through the sensor. The flow equation is:

Where:
f——Pulse frequency [Hz]
k——The meter coefficient of the sensor [1/m3], which is given by the calibration sheet.
Q——The instantaneous flow of fluid (under working condition) [m3/h]
3600-conversion factor in seconds

The meter coefficient of each sensor is filled in the verification certificate by the manufacturer. The k value is set in the matching display instrument. The instantaneous flow and cumulative total can be displayed.

Extended reading: Turbine Insertion Flow Meter for Large Diameter Pipeline

What is k factor in turbine flow meter?

What is k factor in turbine flow meter?

The physical meaning of the meter coefficient K value of a turbine flowmeter is the number of pulses generated by a unit volume of fluid flowing through the flowmeter. Using the international system of units, the unit of the meter coefficient is (1/m3).

Generally, the K factor will not change when the flow rate changes, but it should not exceed the upper limit of the flowmeter too much. The K factor is a constant based on a flow rate under certain process parameters.

How to get k factor on turbine flow meter?

How to get k factor on turbine flow meter?

There are two kinds of different manufacturers k:
One is k=f/Q, that is, the number of vortices generated per unit flow;
The other k=Q/f, that is, the plate flow rate corresponding to each vortex.
The k value is calibrated with the right factory water. The sensor measures the vortex number of the instrument and compares it with the volume flow measured by the calibration device to obtain the k value.

The k value is actually related to the internal mechanical structure of the flow meter measuring tube.
Taking k=f/Q as an example, the formula is as follows:

Where

D-measuring tube diameter
St-Strouhal number, constant within a certain range of Reynolds number
d—-The characteristic width of the vortex generator
m—The ratio of the arcuate area on both sides of the vortex generator to the cross-sectional area of ​​the pipe

In fact, this formula has no practical meaning for you. The values ​​of d and m are difficult to measure accurately. Therefore, it is difficult to obtain an accurate k value by calculation.

How to Calibrate a Turbine Flow Meter?

High Pressure Turbine Flow Meter

The high-pressure liquid turbine flowmeter is a special high-pressure flowmeter designed for hydraulic equipment, engineering machinery, chemical and other high-pressure fluid industries. The housing is made of stainless steel. The table structure is simple, and the structure design is optimized. It adopts high pressure butt welding flange clamp or high pressure screw connection structure.

Wide range of applications:
High-pressure liquid measurement occasions such as chemical high-pressure pipelines, hydraulic equipment, engineering machinery, and test benches. Hydraulic oil, circulating oil, oil station, construction machinery and other high-pressure liquids.

High pressure structure design, up to 40MPa

Turbine Flow Meter Price

Compared to other liquid flow meters. The price of turbine flowmeter is more advantageous.

For example: 4″, DN100 liquid turbine flowmeter. RS485 output. Accuracy ±1.0%R. SS304 material. Reference price USD600.00.

Reference price: US $200-1,500/ Piece. Contact Sino-Inst sales manager now to request a quotation!

Extended reading: Quantitative control with turbine flowmeter

FAQ

Request a Quote

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

Cryogenic Flow Meters for Highly Accurate and Reliable Cryogenic Fluids Flow Measurement.

Commonly used Cryogenic Flow Meters include cryogenic turbine flow meters, orifice flow meters, mass flow meters, target flow meters, etc. Representative cryogenic fluids include LNG (liquefied natural gas), LN2 (liquid nitrogen), LO2 (liquid oxygen), liquefied ethylene, liquid hydrogen, liquid chlorine, and these cryogenic gases. LPG (liquefied petroleum gas) is not included in the cryogenic Fluid.

Featured Cryogenic Flow Meters

Cryogenic Turbine Flow Meter

The liquid nitrogen flow meter is a commonly used cryogenic flow meter. The low-temperature turbine flowmeter is a dedicated liquid nitrogen flowmeter. It can also be used to measure cryogenic liquids such as liquid oxygen.

Liquid nitrogen refers to liquid nitrogen. Liquid with extremely low temperature. In industrial production, liquid nitrogen can be used as a deep refrigerant. The low-temperature turbine flowmeter is used as a liquid nitrogen flowmeter, which can work at a low temperature of -196°C (-320.8 °F). Liquid Nitrogen Flow Meter’s Turbine sensor structure at ultra-low temperature (-196℃) is made of special customized material, and it is equipped with low-temperature resistant amplifier. Realize the instantaneous and cumulative flow monitoring of liquid nitrogen.

Know more about: Turbine type Flow Meter

Cryogenic Mass Flow Meter

Cryogenic Mass Flow Meter is developed for measuring cryogenic media such as liquefied natural gas. The flow meter consists of a mass flow sensor and a transmitter. Adopting high-efficiency heat insulation technology to effectively control the heat exchange between LNG and other low-temperature media when flowing through the sensor. Reduce the vaporization of LNG and other low-temperature media in the pipeline, thereby reducing the impact of vaporization on flow measurement.

The equipped transmitter uses a digital signal processor (DSP) to process the collected signals and has the ability to judge the real-time state of the medium and other intelligent self-diagnosis functions. Temperature measurement range: -200-350℃.

Extended reading: Liquid Mass Flow Meter

Orifice flowmeter for cryogenic fluid

At present, many flows measuring instruments for extremely low-temperature fluids are orifice flowmeters, and their reliability is also very high.

1. The material is 316L;
2. In order to prevent fluid leakage caused by cold shrinkage. It is recommended to use welding method to connect, the orifice plate and the pipe use the same material;
3. The porous orifice plate has advantages in the flow measurement of very low temperature fluids such as liquefied natural gas. Because the gas that may be generated can flow smoothly downstream from the small holes on the upper part of the orifice plate, and no gas accumulates in front of the orifice plate.

Extended reading: Fluid flow meter types

Target flowmeter for cryogenic fluid

The target flow meter also called a drag force flowmeter. The target flow meter inserts a target (drag element) into the flow field. The target usually is a flat disc or a sphere with an extension rod. There will be a differential pressure. And then target flow meters measure the drag force on the inserted target and convert it to the flow rate. Sino-Inst manufactures target flow meters for liquid, gas, and steam measurement.

It can accurately measure the flow of gas and liquid under various working conditions of normal temperature, high temperature 500℃, and low temperature -200℃;

Read more about Nitrogen Gas Flowmeters-Liquid Nitrogen Flowmeters

How does a cryogenic flow meter work?

Different cryogenic flow meters have different working principles. Here we choose the commonly used target type flowmeter to introduce the working principle.

When the medium flows in the measuring tube, the pressure difference caused by its own kinetic energy passing through the blocking member (target). And has a force on the blocking member. The magnitude of the force is proportional to the square of the velocity of the medium.

The mathematical way is as follows:
F = CdAρ • V2 / 2

In the formula: F —— the force of the choke (kg)
Cd-object resistance coefficient
A ——Axial projection area of ​​the choke on the measuring tube (mm2)
ρ ——Density of medium under working conditions (kg / m3)
the v-average flow velocity of the medium in the measuring tube (m / s)
The force F received by the choke member (target) is transmitted to the capacitive force sensor via a rigidly connected transmission member (stem).

And the capacitive force sensor generates a voltage signal output:
V = KF
In the formula:
V——Voltage output by the capacitive force sensor (mV), K——Proportional constant, F——The acting force of the choke (target)
So, after the voltage signal is pre-amplified, AD converted. And processed by the computer. The corresponding instantaneous flow and the cumulative total can be obtained.

Extended reading: liquid nitrogen level measurement

Liquid Nitrogen-Liquid Oxygen-Liquid Co2 Flow Meter

For the above liquid nitrogen, liquid oxygen, liquid hydrogen and other extremely low temperature liquids, if you need to detect the flow. Then we recommend choosing a very low temperature turbine flowmeter or a gear flowmeter. These two flowmeters can perform excellent flow detection under extremely low temperature conditions.

The low-temperature turbine flowmeter is used as a liquid nitrogen flowmeter, which can work at a low temperature of -196°C (-320.8 °F). The Turbine sensor structure at ultra-low temperature (-196℃) is made of special customized material. Realize the instantaneous and cumulative flow monitoring of liquid nitrogen.

1. Nominal diameter:
   Common type (0.5～300) mm;
   Anti-corrosion type (6～100) mm
   Insertion type (80～600)mm
2. Medium temperature:
   Ordinary type (-20～80)℃
   High temperature type (-20～120)℃
   Ultra-low temperature type (-196～80)℃
3. Ambient temperature: (-20～55)℃;
4. Accuracy: ±0.2%, ±0.5%, ±1%;
5. Detector signal transmission line system: three-wire voltage pulse (three-core shielded cable);
6. Power supply: voltage: 12V±0.144V, current: ≤10mA;
7. Output voltage amplitude: high level ≥ 8V, low level ≤ 0.8V;

Gear flow meters are also a good choice for small-caliber liquid nitrogen measurement.

Gear flow transmitter is a type of positive displacement flow transmitter. It is a high-precision transmitter for measuring volume flow.

• High pressure resistance (1.0-45MPa)
• High and low temperature resistance (-196℃-200℃)
• Can measure various viscous media
• High precision and repeatability
• Pulse output/analog output optional
• Wide range ratio (1:100)
• Wide measuring range
• Strong anti-corrosion and anti-fouling ability (acid and alkali)

Frequently
Asked
Questions

Help Center

What is turbine flow meter?

Turbine flow meters are velocity flow meters, also called impeller flow meters. Can be used to measure the instantaneous flow and cumulative flow of liquids and gases.

Turbine flowmeters are widely used in flow measurement: petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas, coal gas and cryogenic fluids. Turbine flowmeter signals can be divided into pulse signals or current signals (4-20mA). It is suitable for use with secondary display, PLC, DCS and other computer control systems.

What is the purpose of the flowmeter?

The purpose of the flowmeter is to measure the flow of fluid in a pipe or open channel.

Flow meters are the eyes of industrial production.

Flow meters play a big role. It not only monitors media flow in real time. Moreover, in this aspect of automation, many industrialized enterprises have greatly reduced a lot of manpower and material resources.

Some common types of flowmeters that mainly measure gases and liquids are:
Electromagnetic Flowmeter,
Vortex flowmeter,
Thermal mass flow meters,
orifice flowmeter,
Turbine flowmeter,
V cone flowmeter,
orifice flowmeter,
Porous balance flowmeter,
Metal rotameter, etc.

What is the most accurate flow meter?

In my country, the absolute value of the maximum relative percentage error of the flowmeter is used as the standard for dividing the accuracy level.
The maximum relative percent error is a simplified relative error.
The calculation method is:
Relative percent error = (measured value of the measured parameter – standard value of the measured parameter) / (the upper limit of the scale – the lower limit of the scale) * 100%
In order to facilitate the transmission of the value, the country has uniformly stipulated the series of accuracy grades of the instrument.

Remove the “±” and “%” numbers from the relative percent error of the flowmeter. It can be incorporated into the national unified instrument accuracy grade series:

1. The accuracy of the first-class standard flowmeter: 0.005, 0.02, 0.05;
2. The flowmeter accuracy of the secondary standard: 0.1, 0.2, 0.35, 0.5;
3. Accuracy of general industrial flowmeter: 1.0, 1.5, 2.5, 4.0.

In addition, according to different uses. The accuracy of the flowmeter can also be divided into different grades:

1. The accuracy level of the flowmeter used in scientific experiments is above 0.05;
2. Most of the instruments used for industrial testing are in grades 0.1 to 4.0. Among them, the standard meters used for calibration are mostly grade 0.1 or 0.2. Most of the instruments used on site are grade 0.5 to 4.0.
3. The instruments used for industrial testing are mostly in the 0.1 to 4.0 level.

Coriolis mass flow meters should be the most accurate flow meters on the market today.
Of course, the user only needs to choose the precision that meets the needs.

What is a CO2 flow meter?

CO2 flow meters are instruments that can measure the flow of gaseous or liquid carbon dioxide. CO2 is a common industrial gas, and effective measurement is very important.

Carbon dioxide (CO2) is a colorless, odorless gas at room temperature and pressure. We often recommend precession vortex flowmeters, v-cone flowmeters, vortex flowmeters, gas turbine flowmeters, etc. Under different working conditions, we will choose different flow meters for customers.

Read more about: Industrial CO2 flow meters

Related Blogs

Sino-Inst, Manufacturer for Cryogenic Flow Meters. A wide variety of Cryogenic Flow Meters options are available to you. 

Sino-Inst’s Cryogenic Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

If you need to purchase a Liquid Flow Meter, this article will be your best Purchasing Guide. Keep reading, Please!

Flow meters are classified into liquid flow meters and gas flow meters according to the medium. Then the common liquid flow meters mainly include: vortex flowmeter, turbine flowmeter, electromagnetic flowmeter, ultrasonic flowmeter, differential pressure flowmeter, open channel flowmeter, Coriolis mass flowmeter, etc.

Featured Liquid Flow Meters

Liquid Flow Meter Types

You may like: Digital Flow Meters Guide| Liquid and Gas

Step 1: Confirm your liquid condition.

Before choosing a flow meter, you should sort out the details of your measured liquid.
such as:

• Liquid name
• Liquid temperature
• Pipeline pressure
• Liquid viscosity
• Corrosive
• Flow rate range
• Pipe diameter

If you need to measure liquids under special circumstances, you can skip to the following:
Low temperature: Gear flow meter: High and low-temperature resistance (-196℃-200℃).
High viscosity: Oval Gear High Viscosity Flow Meter
Fuel: Industrial Fuel Flow Meters

Step 2: Identify your measurement needs.

The flow meter is designed to meet your measurement needs. Therefore, according to your needs, determine the function of the flowmeter. such as:

• Measure volume flow or mass flow?
• Is it necessary to display the instantaneous flow and cumulative flow locally?
• What kind of signal output is needed? 4-20mA? Pulse?
• What kind of installation form and size are planned? Such as ANSI150 flange? Outside clip?

Most liquid flow meters measure volumetric flow. If what you need is mass flow, you can jump to: Mass Flow Meters

If you are unwilling to change the pipeline, you can only choose to install the ultrasonic flowmeter with an external clamp.

Step 3: select the appropriate flow meter type.

Up to now, there may be many types of flow meters suitable for your measurement situation. Then you need to filter the flowmeter according to your pipe diameter and flow range.

For example, you need to measure the flow of milk. 2-inch pipe. Then you can refer to the flow range to select the appropriate flow meter.
2 inches, electromagnetic flowmeter, 2.21~35.35m³/h;
2 inches, turbine flowmeter, 4~40m3/h.

For example, what you need to measure is the water flow of a DN1000 pipeline. Then it is recommended that you choose the insertion electromagnetic flowmeter.

Step 4: Except for dedicated flow meters.

Under normal circumstances, when measuring some specific media, we will recommend a specific type of flowmeter.
such as:
Measure sewage, use an electromagnetic flowmeter.
To measure diesel oil, use a turbine flowmeter.

Step 5: Contact the manufacturer

The above liquid flow meter selection steps and selection suggestions are based on certain experiences.
If you are a newcomer, you are not sure about the above process. You can directly contact Sino-Inst sales engineers. We will provide you with the best advice.

Step 6: Combine the budget

According to your budget, choose the right liquid flow meter.
For example, you need to measure the water flow. Normally, you can choose an electromagnetic flowmeter or ultrasonic flowmeter. Then you can choose according to your budget.

Such as 2inch pipeline, DN50 electromagnetic flowmeter, USD 484.50/pc
With external clamp ultrasonic flowmeter, USD 423.00/pc

For example, 4inch pipe, DN50 electromagnetic flowmeter, USD 784.50/pc
With external clamp ultrasonic flowmeter, USD 423.00/pc

Of course, the above is our experience. It’s not absolute.

You may need the following traffic conversion tools to help you.

Extended reading: U-series Liquid Mass Flow Meter | Liquid-slurry flow measure

Liquid Flow Tools

Converters for conversion and calculation of flow. Or a calculation tool that requires flow measurement to obtain other measurement parameters. Help users choose the right flow sensor and transmitter!

You may lke:

FAQ

Sino-Inst offers over 30 Liquid Flow Meters products. About 50% of these are differential pressure flow meters. 40% are water meters (like the Insertion Turbine Flow Meter), and 40% are water treatment (like the Annubar flow meter ).

A wide variety of Liquid Flow Meters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Liquid Flow Meters, located in China.

The top supplying country is China (Mainland), which supply 100% of the Liquid Flow Meters respectively.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Liquid Flow Meters products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com