Category Archives: Flow Measurement Solutions

PD Flow Meters Selection and Application | Oil-Liquid

Posted on by

What is PD flow meter?

PD flow meters (positive displacement flow meters) are the only flow measurement technology that directly measures the volume of fluid passing through the flow meter.
Rotating components within a high precision chamber capture the fluid. The rotational speed of the rotor is proportional to the flow rate. Rotation is caused by the flow of fluid. Mechanical flow meters rely on rotation to drive a magnetic coupling or direct gear train connected to a mechanical counter. Under the conditions of a given flow meter, the volume of this metering space is determined. Just measure the number of rotations of the rotor. The cumulative value of the volume of fluid passing through the flowmeter can then be obtained.

RFQ More Flowmeters
What is PD flow meter?

PD Flow Meters can be divided into oval gear flowmeters, scraper flowmeters, dual rotor flowmeters, rotary piston flowmeters, reciprocating piston flowmeters, disc flowmeters, liquid-sealed rotary drum flowmeters, etc.

Features of PD Flow Meters

Advantages

  • High measurement accuracy;
  • The installation pipeline conditions have no influence on the measurement accuracy;
  • Can be used for the measurement of high viscosity liquids;
  • wide range;
  • The direct-reading instrument can directly obtain the accumulation without external energy, and the total amount is clear and easy to operate.

Disadvantages

  • The structure is complex and the volume is huge;
  • The type, caliber, and working state of the medium to be tested are relatively limited;
  • Not suitable for high and low temperature occasions;
  • Most instruments are only suitable for clean single-phase fluids;
  • Generates noise and vibration.

Featured PD Flow Meters

Pointer Type Oval Gear Flow Meter
LCD display Oval Gear High Viscosity Flow Meter
High Temperature Oval Gear Flow Meter – Heating oil
Oval Gear-Marine Fuel Flow Meter
Thermal insulation Oval Gear flow meter
Clamp Filling Oval Gear Positive Displacement Flow Meter
Liquid Roots Meter
Gear flow meter for Micro flow
Helical Gear-PD Flow Meter
Micro Flow Meter

PD Flow Meters are also known as positive displacement flow meters. It is mainly composed of measuring body and measuring part. The metering body consists of a shell and a movable body (rotor of the rotameter). The core part is the movable body, which is the moving part in the measurement process. Each measuring cavity formed by the movable body and the casing is a standard volume unit, which is used to measure the volume of the fluid to be measured.

Extended reading: Fluid flow meter types

The measuring part is actually a rotational speed or counting sensor. Magnetic material is embedded in the pinion extending out of one of the screws on the screw flowmeter. When the screw rotates, the sensor can identify the rotational speed of the screw through the magnetic effect. And convert it into a standard pulse signal or current signal. In this way, the flow can be directly displayed by the secondary instrument or collected and analyzed by the computer.

There are many types of positive displacement flow meters. They can be classified according to different principles. Usually, according to the structure of the measuring element, it is divided into rotor type, scraper type, rotary piston type, reciprocating piston type and diaphragm type.

Among them, the rotor type is the most commonly used. The common gear type, screw type, waist wheel type and egg wheel type flowmeter belong to the rotor type.

Extended reading: Positive Displacement Flow meter Technology

The interior of the positive displacement flowmeter is designed with a space that constitutes a certain volume. The rotor inside the flowmeter rotates under the action of the pressure of the fluid flowing from the inflow port.

With the rotation of the rotor, the fluid flows from the inflow port to the discharge port. At this time, during the rotation of the rotor, a certain volume space is formed between the rotor and the flowmeter housing. The fluid fills this space with the rotation of the rotor. It is continuously sent to the discharge port.

If the volume of the space is designed, the number of rotations of the rotor is measured. The volume given by the space can be obtained, thereby obtaining the volume of fluid flowing through.

Extended reading: Liquid mass flow controller

This fixed-displacement flow measurement method for positive displacement flowmeters can be traced back to the 18th century. It entered the stage of widespread commercial application in the 1930s.

In recent years, the sales of PD flow meters in some industrialized countries have exceeded 20%. In my country, it also accounts for about 20%. It is mainly used in the metering of petroleum-based media.

But because of its precise metering characteristics. In recent years, it has been rapidly expanded to chemical, food, medical and other sectors to accurately measure the total amount and flow of expensive media.

In the measurement of petroleum, an international standard (ISO/DIS 2714) for measurement systems using positive displacement flowmeters has been developed. Moreover, positive displacement flowmeters with high precision, long-term performance retention and high repeatability are also used as standard instruments for industrial flow measurement, calibrating and calibrating industrial instruments.

In short, due to the high accuracy of positive displacement flowmeters, they are often used to measure the flow of relatively expensive media. High viscosity media can be measured. Therefore, it is generally used for the measurement of high-viscosity liquids in petroleum, chemical, metallurgical and other industries.

Extended reading: How to choose a high viscosity flow meter?

Of course it is also suitable for measuring low viscosity liquid media. In addition, positive displacement flowmeters can also measure gases. At the same time, the installation of positive displacement flowmeter does not require the front and rear straight pipe sections.

Extended Reading: Liquid Turbine Flow Meter

The Sanitary Positive Displacement Flow Meter is made of stainless steel and is quickly connected by Tri-clamp. Can be used to measure viscous liquids in the food industry. Such as sweeteners, edible oil, palm oil, honey, fat, tallow, fat, syrup, molasses, etc.

Extended Reading: Fuel Flow Meters for Diesel-Marine fuel-Industrial oil

Extended Reading: Mechanical oil flow meter

Positive Displacement Flowmeter Selection

Help Center

The manufacturer generally specifies the flow range according to the type of the measured medium (mainly different viscosity), use characteristics (continuous use or intermittent use) and measurement accuracy.

In order to maintain good performance and long service life of the flowmeter. It is recommended to select 80% of the maximum flow rate of the flow meter when the maximum flow rate is used continuously.

If the manufacturer does not clearly specify the flow range according to the type of medium and the characteristics of use. The maximum flow rate for intermittent use can be 100% of the upper flow limit.

When used continuously, the maximum flow rate of medium viscosity liquid is 80% of the upper flow rate of the flowmeter. The maximum flow rate of low-viscosity and high-viscosity liquids is 50% to 60% of the upper flow rate of the flowmeter.

The fundamental error of most positive displacement flow meters is ±0.5%. The basic error of the higher precision flowmeter is ±(0.1%-0.2%). The oval gear flowmeter can reach ±0.05%. The basic error of the lower precision flowmeter (such as the elastic scraper flowmeter) is ±(1.0%-1.5%).

The accuracy of a positive displacement flowmeter is the fundamental error obtained under laboratory conditions. In actual use, field conditions often deviate from laboratory conditions, resulting in additional errors. The actual error should be the sum of the basic error and the additional error. When selecting and using, measures should be taken according to the on-site situation to ensure the measurement accuracy.

Extended reading: Crude Oil Measurement – Radar Level Meter Measuring Vaulted Buffer Tank

Positive displacement flowmeters rely on the fluid to push the measuring fittings, so the pressure loss is high. The pressure loss of a positive displacement flowmeter is larger than that of other types of flowmeters of the same diameter and flow. The pressure loss of general liquids is 20 to 100 kPa.

When measuring liquids with high vapor pressure, excessive pressure drop will cause cavitation. If cavitation exists for a long time, it will damage the flowmeter accessories. Some flowmeters that allow short-term overflow to 120% of the upper limit of measurement should pay more attention to this problem .

Extended reading: Orifice Plate Flow Meter

Fluid corrosiveness is a major factor in determining flowmeter material.

For various petroleum products, cast steel and cast iron are used.
For slightly corrosive chemical liquids and cold water, it is made of copper alloy.
Made of stainless steel for pure water, high temperature water, crude oil, asphalt, high temperature liquids, chemical liquids, food or food raw materials.

The corrosion resistance of positive displacement flowmeters is generally not strong. In the food and biopharmaceutical industries, due to hygiene requirements, flow meters are frequently sterilized. Fittings that come into contact with fluids must be made of stainless steel and other hygienic materials. They must be easily disassembled.

Generally speaking, the viscosity of various gases is similar. It has no effect on the performance of the flowmeter. The viscosity of liquids is quite different.

In order to adapt to the liquid with high viscosity, the positive displacement flowmeter has a structure with a large gap.

Although the volume-second flowmeter is affected by viscosity, it is less affected than differential pressure and float turbine flowmeters. Viscosity generally affects the measurement error, pressure loss and flow range of positive displacement flowmeters.

Extended reading: Ultrasonic Flow Meters Types & Technical Guide

When the flowmeter is used at higher temperatures, the maximum working pressure rating must be reduced. Sudden valve opening and closing can create water hammer effect. Shock force may exceed operating pressure. Shock force may also cause false readings. Buffer tank may be installed if necessary.

Temperature will not only affect the compressive strength of the flowmeter, but also affect the measurement accuracy. Reduced structural clearance can jam moving parts. Therefore, when used at higher temperatures, a dimensional clearance should be reserved to compensate.

Especially when different materials are used in combination, pay more attention to the difference in thermal expansion coefficient.

Changes in temperature also change the viscosity of the liquid, causing flow changes. It can be corrected by automatic temperature compensation, and there must be a suitable preheating time before use, and observe whether it can operate normally.

Extended reading: Heating Oil Flowmeters

Usually the compressibility of liquids is negligible, however, compressibility should not be neglected when measuring oil with high accuracy.

For example, when the pressure of heavy oil rises from 0.5 MPa to 6 MPa, the volume is compressed by 0.45%. LPG is more compressible.

Gases are highly compressible, and their volume decreases at low pressures in proportion to pressure increases. Most positive displacement flow meters are used for low pressure conditions and can be directly converted.

However, under high pressure conditions, the volume reduction is not proportional to the pressure increase. The gas compressibility factor should be considered.

Extended Reading: Summary Of Crude Oil Flow Measurement Options

Extended Reading: Guide and Selection for Diesel Fuel Flow Meters

Sino-Inst, Manufacuturer for PD Flow Meters. For example: crude oil flowmeter, diesel flowmeter, gasoline flowmeter.

Sino-Inst’s PD 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.

Extended reading: Hydraulic oil flow measurement solutions.

Request a Quote

Please enable JavaScript in your browser to submit the form

Fuel Flow Meter for Boat-Selection & Application

Posted on by

Fuel Flow Meter for Boat refers to a flow meter dedicated to measuring marine fuel. There are many types of marine fuel oil. Mainly include light diesel, heavy diesel, fuel oil, and residual fuel oil. Specifically include: 0# diesel, -10# diesel, 20# heavy diesel, 4# fuel oil, 120# fuel oil, 180# fuel oil, 380# fuel oil, etc.
Therefore, select the appropriate flow meter to monitor the fuel flow and manage the fuel filling or consumption. This is important for controlling fuel costs.

RFQ Digital Flowmeters

At present, ships are in the process of refueling, especially for heavy fuel oil. The traditional method of measuring tank capacity is used to calculate the quantity of fuel oil. This method is very cumbersome and the accuracy is not high. And if the fuel flow meter is used, the above shortcomings can be well overcome.

There are many kinds of flowmeters on the market now, which makes it difficult for designers to choose their models. Different types of flowmeters have different characteristics. When choosing a suitable flowmeter according to the characteristics of the ship’s fuel oil, good test results can be achieved.

Instruments that measure the flow or total volume in pipe flow or open channel flow are collectively referred to as flow meters. There are many types of flow measurement methods and meters. The measuring principle, structural characteristics, scope of application and method of use are different.

Up to now, there are more than 60 types of flow meters available for industrial use. Because so far, there is no flow meter that can be used for any fluid, any range, any flow state, and any use condition.

There are many ways to classify flow meters. According to different classification principles, the classification methods are also different. Classified by principle, flow meters can be divided into three types: volumetric, velocity and differential pressure.

One of the more popular classification methods is from the measurement method and structure classification. It can be divided into: differential pressure flowmeter, positive displacement flowmeter, float flowmeter, impeller flowmeter, electromagnetic flowmeter, fluid oscillating flowmeter, ultrasonic flowmeter, mass flowmeter, plug-in flowmeter, open channel flowmeter There are 11 categories with other flow meters.

Read more about:

Precautions for flowmeter selection

  1. The performance of the flow meter

The performance of the flowmeter is embodied in the flow range, linearity, repeatability and accuracy.

The flow rate range is the range defined by the minimum flow rate and the maximum flow rate. When selecting the type, pay attention that the flowmeter cannot exceed this range under normal use conditions.

Linearity indicates the degree of consistency between the flow characteristic curve and the specified straight line in the entire flow range. According to this feature, the flowmeter output can be divided into linear and nonlinear square roots.

The non-linear error has a great influence on the pulse output type flowmeter with a large flow range. Repeatability refers to the consistency of the results obtained from multiple measurements of the same measured under the premise of the same conditions.

Generally, the higher the repeatability, the more concentrated the measurement value. Accuracy refers to the degree of agreement between the measured value and the actual value.

The lower the accuracy of the meter, the greater the error. The greater the deviation between the measured value and the actual value. When determining the accuracy, it should be selected according to the accuracy requirements of the actual measurement.

Extended Reading: Mechanical flow meter for diesel

  1. Working conditions

The working conditions that affect the flowmeter measurement mainly include temperature and electromagnetic interference.

The volumetric flowmeter uses a constant volume chamber to measure the flow rate. The material of the mechanical parts constituting the chamber is generally made of steel.

It becomes brittle when the temperature is low, and expands when the temperature is high. The pressure is limited at low temperatures.

For example, the twin-screw flowmeter in the fuel viscosity unit of the main engine on the actual ship. The rotor is often stuck during the light-to-heavy oil conversion. This is the reason.

In addition to the above and other conditions, it should be considered. Because of the particularity of the ship’s working environment, it is different from land. When choosing a flowmeter for a ship, it should also be combined with the actual working environment of the ship. Consider other factors that may affect the flowmeter. .

Ships are inevitably affected by many factors when sailing on the water, such as vibration, roll, impact, erosion, and sudden changes in climate. The operating environment is quite harsh. In order to ensure that the instrument can operate reliably and accurately in actual use, marine requirements must be considered when selecting models.

  1. Installation conditions

The installation conditions depend on the requirements of the site space and orientation. Specific instruments have special requirements. Therefore, the installation conditions should be given full attention.

For example, a positive displacement flow meter often requires the installation direction and flow direction of the sensor to be horizontal, vertical and horizontal respectively.
Positive displacement flow meters are sensitive to impurities and require filtration accuracy. Sometimes a filter device is needed. The float type flowmeter is more sensitive to the flow rate. Therefore, in order to eliminate the influence on the measurement. When limited by space, there are also flow regulators. Therefore, the space and orientation of the work site must be considered during installation.

Extended reading: Orifice Plate Flow Meter

Selection of Fuel Flow Meter for Boat

  1. Fuel performance

Fuel oil is a mixed liquid whose viscosity changes greatly with temperature, and there are many impurities in it.
Generally, when fuel oil is installed, it is realized through a closed delivery pipeline. The type of fuel generally installed on real ships is F120, and its density at 20°C is 981.6㎏/m3.

Combine these properties of fuel. Compared with the performance analysis of various flowmeters introduced above. Although volumetric flowmeters and turbine flowmeters have high accuracy, they have high requirements for fluid cleanliness. Electromagnetic flowmeters are only suitable for conductive liquids, so they are not applicable here. Coriolis mass flow meters can be used, but the cost is higher. Differential pressure flow meters are also optional. However, it is necessary to cooperate with a differential pressure transmitter for flow measurement and control.

  1. Working conditions of fuel flow meter

When the fuel flow meter is working, the temperature of the fuel passing through the flow meter is about 40°C. The agreed pump speed is 12m3/h, and the agreed maximum pump pressure is 0.4MPa. The amount of fuel added this time is 240t.

According to these few data, in the further flowmeter selection. Float flow meters should also be excluded. According to the characteristics of the float flowmeter, set up and measure the small flow of fluid. However, when the fuel is installed, the quantity is too large and it is not suitable for selection.

The vortex flowmeter works by using the principle of fluid oscillation. Avoid strong vibration when installing the sensor. However, according to the working conditions of the ship, the vibration and noise are very large. If a vortex flowmeter is selected, the measurement accuracy will be greatly affected in actual use.

It can be generally determined that both the differential pressure flowmeter and the ultrasonic flowmeter meet the requirements. Also, gear flow meters, mass flow meters, etc. These types of flow meters have a wide range of applications and are suitable for a variety of liquids.

Extended Reading: Guide and Selection for Diesel Fuel Flow Meters

Featured Fuel Flow Meter for Boat

Turbine Sanitary flow meter
Low temperature Turbine Flowmeter-Liquid Nitrogen Flow Meter
Handheld Ultrasonic Flow Meter
U-Series Liquid Mass Flow Meter
Gear flow meter for Micro flow
Orifice Plate Flow Meter
Pointer Type Oval Gear Flow Meter
Oval Gear-Marine Fuel Flow Meter
LCD display Oval Gear High Viscosity Flow Meter
High Temperature Oval Gear Flow Meter – Heating oil
Liquid Turbine Flow Meter
 Coriolis Flow Meter
Annubar Flow Meter
 Venturi flow meter
Orifice flow meter
Target flow meters

The intelligent liquid turbine flowmeter is a new type of intelligent instrument that integrates the turbine flow sensor and display integration, which is developed by using advanced ultra-low power single-chip microcomputer technology. It has a compact structure, intuitive and clear reading, and high reliability. Not subject to external power supply. Obvious advantages such as lightning resistance and low cost.

Turbine Digital Flow Meter is widely used to measure the corrosion of stainless steel 1Cr18Ni9Ti, 2Cr13, corundum Al2O3, and cemented carbide in closed pipelines, and there is no fiber, particles and other impurities. Liquids with kinematic viscosity less than 5×10-6m2/s at working temperature, and liquids with kinematic viscosity greater than 5×10-6m2/s. The flowmeter can be used after real liquid calibration. If matched with a display instrument with special functions. It can also carry out quantitative control, over-quantity alarm, and so on. It is an ideal instrument for flow measurement and energy saving.

A Cylinder 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℃).

Cylinder Gear flow meter is a type of positive displacement flow transmitter. It is a high-precision transmitter for measuring volumetric flow. With the flow of the medium, the gears mesh and rotate. Under the action of fluid flow. Measure the number of revolutions of the gear to know the flow of liquid and liquid flowing through the instrument. It is especially suitable for the flow measurement of heavy oil, polyvinyl alcohol, grease, and other high-viscosity media. It can measure the viscosity of Fluid up to 10000Pa.s.

Oval gear flow meter is one of the typical positive displacement flow meters. Measure the flow of liquid filling the pipeline under a certain pressure.

Oval gear flow meter is a pointer display type positive displacement flowmeter. The word wheel accumulates counting, and can be equipped with a zero return device. Oval gear flowmeters are widely used in liquid flow control in various industrial fields. Applicable to various types of liquid measurement, such as crude oil, diesel, gasoline, etc. Choose different manufacturing materials, such as crude oil, diesel, gasoline, etc. can be measured.

PD Flow Meter is referred to as positive displacement flowmeter. Helical Gear-PD Flow Meter is also called, spiral double rotor flowmeter, LLT, LZ double rotor flowmeter or UF-Ⅱ spiral rotor flowmeter.

As a high-precision flow meter, PD Flow Meter has an accuracy of 0.2 level. It is especially suitable for the measurement of industrial liquids such as crude oil, refined oil and light hydrocarbons. It is a new generation volumetric flowmeter. Because it uses a pair of spiral rotors with special teeth, it is also called “Helical Gear Flowmeter”.

Marine Fuel Mass Flow Meter (MFM)

Mass Flow Meters

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

The Singapore Standards Committee issued the new Singapore Standard SS6481-Marine Fuel Mass Flow Meter (MFM) Usage Guidelines. To support the shipping industry’s formal implementation of the “Sulfur Restriction Order” from January 1, 2020 to improve the low-sulfur fuel system. And Guidelines for improving and regulating MFM fuel filling behavior.

Regarding Singapore’s new SS6481-Marine Fuel Mass Flow Meter (MFM) Code of Conduct. The Director of the Technical Committee for Bunkering (Chairman, Technical Committee for Bunkering) Seah Khen Hee pointed out——
“Metrology and system integrity are the dual foundations of SS648. It is the foundation of MFM system approval and fuel metering and handover procedures.”

Extended reading:

Singapore launches enhanced mass-flow metering standard

Sino-Inst, Manufacuturer for Fuel Flow Meter for Boat. For example: crude oil flowmeter, diesel flowmeter, gasoline flowmeter.

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

Request a Quote

Please enable JavaScript in your browser to submit the form

Guide for Digital Fuel Flow Meter

Posted on by

Digital Fuel Flow Meter is a flow meter dedicated to measuring fuel, diesel, gasoline, and petroleum. Digital Fuel Flow Meter generally has a digital display or signal output. Such as pulse or 4-20mA. Such as turbine flow meters, gear flow meters. It can be used to measure the pipeline flow of oil medium storage, transportation, trade, etc. Different pipelines and working conditions require flow meters with different principles or functions. Next, we will analyze in detail.

RFQ
Digital Flowmeters

The digital diesel fuel flow meter comes with a large LCD display which is convenient for clear reading.
Another display method of Diesel fuel flow meter is the dual display of pointer and word wheel instantaneous cumulative count. Now it also supports electronic digital display, which makes the instantaneous and cumulative flow more intuitive. In the case of electronic digital display flowmeter mode, it can also realize the on-site online data remote transmission function to support different signal output modes. The pointer plus the word wheel display and the electronic digital display can be applied to more on-site working conditions and are widely used and recognized.

Extended reading: Fuel Flow Meter for Boat-Selection & Application

As a commonly used energy source in industrial production, diesel oil needs to be metered in many occasions. For pipeline transportation of oil tankers or diesel storage tanks, it is more suitable to select a flow meter with higher measurement accuracy to measure. Because not only to facilitate trade settlement. And it needs to be accurate. The measurement is accurate. Can be used for a long time.

The intelligent liquid turbine flowmeter is a new type of intelligent instrument that integrates the turbine flow sensor and display integration, which is developed by using advanced ultra-low power single-chip microcomputer technology. It has a compact structure, intuitive and clear reading, and high reliability. Not subject to external power supply. Obvious advantages such as lightning resistance and low cost.

Turbine Digital Flow Meter is widely used to measure the corrosion of stainless steel 1Cr18Ni9Ti, 2Cr13, corundum Al2O3, and cemented carbide in closed pipelines, and there is no fiber, particles and other impurities. Liquids with kinematic viscosity less than 5×10-6m2/s at working temperature, and liquids with kinematic viscosity greater than 5×10-6m2/s. The flowmeter can be used after real liquid calibration. If matched with a display instrument with special functions. It can also carry out quantitative control, over-quantity alarm, and so on. It is an ideal instrument for flow measurement and energy saving.

Most widely used types are mechanical and digital inline fuel meters. Differential flow sensors are available. Like: the turbine, positive displacement (oval gear), Coriolis, and differential pressure flow meters.

Sino-Inst offers a variety of fuel flow meters for most fuels. Including diesel, bio-diesel, kerosene, gasoline, oil, heating oil, grease, and certain chemicals. Sino-Instrument offers diesel fuel flow measurement solutions and free technical support. If you have any questions about diesel fuel flow measurement, please contact us.

Marine fuels mainly include light diesel, heavy diesel, fuel oil, and residual fuel oil.

To put it simply, if the tested marine fuel is a low-viscosity, clean fuel. Then you can choose a turbine flowmeter. The price is reasonable and the measurement is stable.

If the marine fuel being tested is heavy oil, high-viscosity fuel. Then it is recommended to choose an oval gear flowmeter.

If the measured marine fuel is a small flow rate. Then it is recommended to use a circular gear flowmeter for measurement.

If the tested marine fuel has impurities. It is recommended to install a filter before the flowmeter.

If you still do not know how to choose the right marine fuel flow meter. You can contact our sales engineer. We will provide you with a suitable marine fuel flow measurement program.

Read more about Large-diameter Oval Gear-Marine Fuel Flow Meter

Volumetric Flow Meter, as a mechanical flow meter, is also called Positive displacement flowmeter. It can measure the volume flow of high viscosity and corrosive fluids.

Volumetric Flow Meter is a mechanical instrument used to measure the volume flow of fluids. A volumetric flow meter is an instrument which can measure either directly or indirectly the volume of a substance which is passing through a specific location in a set period of time. The main advantage of these types of flow meters is that they can handle high viscosity and corrosiveness fluid.

Extended Reading: Magnetic Battery Operated Flow Meter

Electronic flow meters are industrial digital flow meters for fluid flow rate measurement. In more cases, people will default that Electronic flow meters are electromagnetic flowmeters.

Electronic flow meters types like Magnetic, Vortex, and Ultrasonic flow meters. Electronic flow meters are suitable for Industrial liquid, water, natural gas, petrol, fuel, air, and more fluid flow. Electronic flowmeters convert the monitored fluid flow into electronic signals. Including pulse signal, 4-20mA standard signal, etc.

Sino-Inst offers a variety of  Electronic flow meters for flow measurement. If you have any questions, please contact our sales engineers.

There is also a compact electronic turbine flowmeter.
It is widely used for small-caliber measurements of gasoline, diesel, water, methanol, alcohol, etc.

Extended Reading: Petroleum Flow Meter

GPI is a registered trademark of Great Plains Industries, Inc. of the United States. It has been producing turbine and oval gear flow meters for more than 30 years.

The headquarters of American GPI is located in Wichita, Kansas, USA. It is a global professional manufacturer of fluid transportation and measurement. Relying on its strong product development capabilities and complete turbine and elliptical gear flowmeter production lines and product testing lines. After more than 30 years of development, it has won the support and trust of more and more customers around the world.

In China, GPI products have been widely used in the chemical, oil, pharmaceutical, food and beverage, water treatment, and automotive equipment manufacturing industries.

GPI mainly produces two categories of products:
▲ GPI turbine flowmeter, oval gear flowmeter;
▲ GPI fluid delivery and storage system, including manual pumps, electric pumps, etc.

Extended Reading: Fuel Flow Meters for Diesel-Marine fuel-Industrial oil

Featured Digital Fuel Flow Meters

How to Choose the Right Digital Fuel Flow Meter?

There are many types of flow meters on the market, and the prices are different. There are so many brands at home and abroad, it is easy to get confused. So how should we choose the right flow meter?

To put it simply, we should start from the actual measurement conditions when choosing a flow meter. Combine installation requirements, monitoring requirements, and budget costs. In order to choose the most suitable Digital Fuel Flow Meter for you.

  1. Look at the condition of the fluid. Including fluid viscosity, corrosivity, etc. For example, for high-viscosity oils, gear flow meters are recommended. For low viscosity, turbine flowmeters can be used.
  2. Flow rate range. Minimum flow, maximum flow. Common flow.
  3. Pipeline diameter. The inner diameter, outer diameter, wall thickness, etc. of the pipe. Determine the caliber of the flowmeter according to the flow rate and the size of the industrial pipe. Generally, the flow meter that is consistent with the pipeline is selected. If the flow range does not meet, then operations such as necking can be considered.
  4. The temperature of the medium. For example, in the case of ultra-high temperature, the material and structure of the flow meter need to be changed.
  5. Pipeline pressure. Select the pressure level of the flanges connected on both sides according to the pressure level of the process pipeline. According to the different materials of the flowmeter in contact with the liquid, the pressure resistance is different, and the pressure resistance range of stainless steel and copper is larger. If the flow rate is relatively low, pressure loss needs to be considered. In this case, turbines and positive displacement flow meters are not suitable.
  6. Signal output. If signal output is not required, rotameter and mechanical water meter are generally sufficient. The output signal has analog quantity (4-20ma, 0-10 v) and pulse output, these flowmeters can have digital display.
  7. Accuracy requirements.
  8. Installation conditions. Some flow meters have strict requirements for straight pipe sections. Need to be considered in advance.
  9. Budget cost.
  10. Maintenance.

If you sort the above parameters, you don’t know which flowmeter you should choose. Then, you can contact Sino-Inst sales engineer. We will select the appropriate digital fuel flow meter according to your requirements.

Extended Reading: Guide and Selection for Diesel Fuel Flow Meters

Frequently
Asked
Questions

Help Center

Different digital flow sensors include turbine, thermal mass, electromagnetic, ultrasonic, orifice plate, venturi. The different designs of the flowmeters have a variety of applications. With 4-20ma, RS485, or other output.

Then they all work differently. However, they can convert the flow signal into a digital display, or pulse, or 4-20mA signal.

Extended reading: Ultrasonic Flow Meters Types & Technical Guide

What is a fuel flow meter? The fuel flow meter is an instrument that can monitor fuel flow. Industrial Fuel is an important energy source. For example, diesel, marine fuel, gasoline, etc.

Extended Reading: Mechanical oil flow meter

A diesel Flowmeter is a kind of positive displacement Meter to measure the liquid flow or instantaneous flow of the Pipe tube. lt is a kind of accumulated meter. With Characteristics of high accuracy, small change by the fluid Viscosity, it is widely used to measure oil kind liquid, forbidden to measure corrosive.

Extended reading: More Inline Digital Diesel Fuel Flow Meters

Currently, the digital flow meters provided by Sino-Inst support flange installation, threaded installation, plug-in installation or external clamp installation. Different flow meters have different installation requirements.

Extended reading: Orifice Plate Flow Meter

Sino-Inst, Manufacuturer for Digital Fuel Flow Meters. For example: crude oil flowmeter, diesel flowmeter, gasoline flowmeter.

Sino-Inst’s Digital Fuel 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.

Request a Quote

Please enable JavaScript in your browser to submit the form

Mechanical Water Flow Meters

Posted on by

Mechanical water flow meters refer to a type of flow meter suitable for clean water processes or applications. The working principle of a mechanical water flow meter is to measure the speed of water flowing through a pipe. This causes the piston or turbine to rotate. The volume flow of water is proportional to the rotation speed of the blades. Compared with electronic water flow meters, mechanical water flow meters may become clogged when the water is dirty or contains large particles. When the water flow is low, the mechanical water meter does not work well.

RFQ Water Flow Meters

Mechanical Water Flow Meters VS Mechanical Water Meters

Water meter and flow meter are two products with different standards. The focus of the two is also different.

The water meter implements the national standard, and the flow meter implements the industry standard. Water meters require higher requirements than flow meters. Water meters focus on wide-range measurement. And flow meters are suitable for fluid measurement with stable flow rates. Water meters are only used in the water industry, while flow meters are used in major industrial and civil industries. In terms of application range, electromagnetic flowmeters have a wider application range than water meters. However, because the upper and lower limits of flowmeters are relatively narrower than water meters. Water meters are often used in the water industry.

Extended reading: non contact flow meter

Mechanical flow meters are a type of flow meters that use arrangement moving parts to measure flow. The fluid passes through a series of gears or chambers (positive displacement or PD) or through a rotating turbine or rotor. The mechanical flowmeter is different from electromagnetic and ultrasonic in principle. Mechanical flow meters easily monitor liquid flow rates for water, fuels, viscous fluids and more.

Extended Reading: Collection of Industrial Insertion Flowmeter Type

Mechanical water meters have been used by us to measure water consumption for decades. In recent years, with the introduction of smart water, smart city policies. Relevant departments and the water department advocate the use of smart water meters. Smart water meters are widely used. There are still many areas using machinery. Water meters need to be replaced. Smart water meters still have a lot of room for the replacement.

The working principle of the mechanical water meter is that the water flow is driven by the impeller to drive the electromechanical water meter quantitatively. Its function and performance are far from being able to meet the growing technological construction. The disadvantages of the mechanical water meter:

Must use water of similar quality to tap water. And the liquid must not contain rust, gravel, aquatic plants, and other impurities;
It is more difficult to manufacture products with a high range ratio. The range ratio of traditional mechanical water meters is usually less than 80;
Mechanical water meters use impeller gears and other mechanical rotating parts for measurement. The longer the use time, the lower the measurement accuracy;
The pressure loss is great.
Single installation must be strictly horizontal or vertical installation.

For users, the “intelligent water meter” is a tap water meter with remote transmission function.

Extended Reading: Chilled Water Flow Meter

Water flow meters are flow meters that can diaplay the flow rate of industrial water pipe.

A water flow meter measures the amount of water flowing through a pipe. We have several kinds to choose from, depending on the application, maintenance needs, and budget.

Extended reading: 2 inch Water Flow Meter

There are four common water flow meter types:

Turbine (also called mechanical), Vortex, Ultrasonic, and Magnetic. We will tell you everything you need to know about them and help you choose one for your application.

First, you should know the flow meter working principles.

Extended reading: Ultrasonic Flow Meters Types & Technical Guide

Compared with other flow meters, the mechanical flowmeter relies on the rotation and displacement of mechanical parts to measure the flow rate. Common mechanical flow meters have the following categories.

Tool: Volumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

A positive displacement flowmeter as a mechanical flow meter is a common type of Volumetric Flow Meter. It can measure the volume flow of high viscosity and corrosive fluids.

Volumetric flow meter working principle

The positive displacement flow meter is a flow meter that uses mechanical measuring elements to continuously divide the fluid into a single known volume, and repeatedly fill and discharge the volume of fluid to accumulate the total amount of fluid.

Read more about: positive displacement flowmeter

A Rotameter flow meter is a variable area flow meter based on float position measurement. It is suitable for liquid and gas volumetric flow measurement and control.

Rotameter flow meter working principle

When the measured fluid passes through the annulus formed by the cone and floats from the bottom to the top. The differential pressure produced at the upper and lower ends of the float forms the force for the float to rise. Until the rising force equals the weight of the float immersed in the fluid, the float will stabilize at a certain height.
The height of the float in the tapered tube and the flow rate through it correspond to each other.

Read more about Rotameter flow meter-Variable Area Flow Meters

Extended reading: Beginner’s Guide: Variable area 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 Flow Meter Working Principle

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.

Read more about Turbine Flow Meter Working Principle

The 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℃).

Gear flow meter working principle

With the flow of the medium, the gears mesh and rotate. Under the action of the fluid flow, a pressure difference is formed at both ends of the instrument inlet and outlet. There is no need for power supply. A pair of gears rotate freely. The cavity between the gears is filled with liquid. Discharge and measure the number of revolutions of the gear to know the flow of liquid and liquid flowing through the instrument.

Read more about Gear flow meter for Microflow

A common mechanical flow meter is inserted into the pipe and uses a turbine, wheel, or paddle to measure the speed. Then calculate the volume flow by knowing the cross-sectional area of the pipe in which they are installed. A common type of the above-mentioned mechanical flow meter uses a turbine. It rotates as the water flow applies force to the blades. The rotation of the turbine is proportional to the speed of the fluid flowing through it. Once the speed is known, the flow rate can be calculated.

Other mechanical watches use the same basic mechanical principles to measure flow. They operate effectively in full pipelines and when used in areas with the stable flow and almost no turbulence. Mechanical flow meters will operate in all types of liquids. However, it is prone to clogging and performance degradation due to the accumulation of solids on the turbine blades. They also block part of the flow and require regular maintenance of gears and moving parts.

The most common mechanical water flow meter is the turbine flow meter.

Extended reading: Insertion Ultrasonic Water Flow Meter – Designed for Agricultural Irrigation, Garden Management

Read more about: Flow Meter Selection Guide

More Featured Water Flow Meters

Magnetic Water Flow Meter
In-Line Ultrasonic Flow Meter
Liquid Turbine Flow Meter
Dual Channel Ultrasonic Water Meter
Handheld Ultrasonic Flow Meter
Turbine Insertion Flow Meter
Ultrasonic Clamp on Flow Meter
Remote Magnetic Sewage Flow Meter
Magnetic Sanitary Flow Meter
Turbine Sanitary flow meter
Insertion Magnetic Flow Meter
Rotameter flow meter-Variable Area Flow Meters

Frequently
Asked
Questions

Help Center

Mechanical Type Flow Meter is a type of flow meter. The mechanical flowmeter is a purely mechanical measuring component. Such as turbine flowmeter, rotameter, etc.

Extended reading: water meter installation details

Compared with other flow meters, the mechanical flowmeter relies on the rotation and displacement of mechanical parts to measure the flow rate. Common mechanical flow meters are Positive displacement flow meter; Variable area flowmeter; Turbine flowmeter; Gear flow meter.

Extended Reading: Metal Tube Flow Meter Applications

The two instruments also measure the flow of liquid in the pipeline, so what is the difference between them?

Many users ask why it is so expensive when they ask about the flowmeter. So let’s first talk about the difference in price. The price of flow meters is much higher than that of water meters. The price with high precision and large-diameter are higher. The price of a water meter is much lower, basically, you can buy it for tens of dollars. The higher price is only three to four hundred yuan.

Of course, the price difference between them is so big, the function is definitely very different. In addition to measuring the instantaneous flow of liquid, the flow meter. It can also measure the cumulative flow. And the flow data can be output to the secondary meter. Convenient statistics and management. These are things that water meters cannot do.

The water meter is in cubic units, while the flow meter can be in cubic or liter units. The unit of liters means that the flowmeter is more accurate and detailed, and is more suitable for factory production and trade requirements.

Extended reading: Advantages and disadvantages of ultrasonic water meters

Sino-Inst offers over 3mechanical 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 mechanical water flow meter options are available to you, such as free samples, paid samples.

Extended Reading: Rotameter vs Flow meter

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

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

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Mechanical water flow meter 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.

Request a Quote

Please enable JavaScript in your browser to submit the form

Flow Totalizer Meter vs Flow Meter

Posted on by

A flow totalizer meter is sometimes referred to as a flow meter or flow totalizer. flow totalizer meter displays the flow rate from either an analog or pulse output flow sensor as well as the accumulated total and grand total volume over time. Flow meters are devices used to measure the flow rate or quantity of a gas or liquid in a pipe. The flow totalizer meter works on the basis of a flow sensor. It shows the data results that people want.

Buy Now

Sino-Inst offers a variety of Record and Analyze instruments for industrial control. Hope that through the introduction of this article, you can learn more about Flow Totalizer Meter vs Flow Meter. To help determine the right product for your project.

Totalizer is a meter that can display the measured cumulative value from a certain specified time to the reading time.

In the central processing unit. The accumulator is a type of register. Used to store intermediate results produced by calculations. If there is no register like the accumulator, then after each calculation (addition, multiplication, shift, etc.), the result must be written back to the memory. Maybe I have to read it back soon. However, the speed of access to the main memory is slower than the access from the arithmetic logic unit to the accumulator with a direct path.

In the arithmetic unit, the accumulator is a register dedicated to storing an operand and the result of an arithmetic or logical operation. It can perform operations such as addition, subtraction, reading, shifting, cyclic shifting, and complementation. It is the main part of the arithmetic unit.

In the central processing unit CPU, the accumulator (accumulator) is a kind of scratchpad. It is used to store intermediate results produced by calculations. If there is no register like an accumulator. Then after each calculation (addition, multiplication, shift, etc.), the result must be written back to the memory, and then read back. However, the speed of access to the main memory is slower than the access from the mathematical logic unit (ALU) to the accumulator with a direct path.

In assembly language programs, the accumulator-AX is a very important register. But when it is used to save temporary data in the program. Finally, it is transferred to other registers or memory units. To prevent the data in it from being modified during the execution of other instructions. In order to get incorrect results. Bring unnecessary trouble to the debugging of the program.

Read more General-purpose Flow Totalizer for Data collection and calculation

The flowmeter is defined as an instrument that indicates the measured flow rate and/or the total amount of fluid in the selected time interval. Simply put, it is an instrument used to measure fluid flow in pipes or open channels.

Flow meters are divided into differential pressure flow meters, rotor flow meters, throttling flow meters, slit flow meters, volumetric flow meters, electromagnetic flow meters, ultrasonic flow meters, and so on. Classified by medium: liquid flow meter and gas flow meter.

Extended reading: Ultrasonic Flow Meters Types & Technical Guide

Simply put, a Totalizing Flow Meter is a running total of how much fluid (gas, liquid, steam) has passed by the sensor within a given time. For example, “in the last 60 seconds, there have been 30 gallons of water flowing by the sensor.”

Extended Reading: Magnetic Battery Operated Flow Meter

A pure totalizer is not a flow meter.

Usually, flow meters measure instantaneous flow. If you need to know the total amount of flow, you need to use a totalizer.

A complete flow detection system includes several parts such as sensing, transmission, calculation, integration, display, etc. Each part can be an independent instrument. It is also possible to integrate several functions into one watch.

Many flow totalizers on the market now integrate calculation, totalization, and display. It includes most of the functions of the flow system. Some manufacturers set the totalizer and other parts as flow meters and use the name of the complete set on the totalizer. If you buy the totalizer alone, you will see that the name is flowmeter.

So the flowmeter [maybe] includes a totalizer, but the totalizer is not a flowmeter.

Extended reading: Insertion Ultrasonic Water Flow Meter – Designed for Agricultural Irrigation, Garden Management

If you get here, you still can’t find a suitable product. Then let us take a more detailed look at the functions and applications of the Flow Totalizer Meter.

Flow Totalizer Working Principle

The flow totalizer is composed of four parts: measurement loop, digital panel meter, regulator, and power supply.

The stabilized power supply converts the 220V power supply into a stable DC voltage as the other part of the power supply.

The measurement loop processes the signal (voltage, current, etc.) sent by the flow transmitter into a voltage signal.

After A/D conversion, the signal is sent to a dedicated central processing unit for processing. Not only to the digital panel meter but also to the regulator. After comparing with the set value, it outputs a control or alarm signal according to the regulation rule.

The flow totalizer is a commonly used paperless recorder. What Is A Paperless Recorder?

Temperature Recorder R7600
Universal Input-Paperless Recorder R7100

Extended reading: How to realize the flow accumulation function in PLC?

Flow Meter/ Totalizer for Water

The water flow meter is an instrument specially used to measure the flow of water in pipes. You can get many different types of water flow meters from your facility.

When used in certain applications, each flow meter has its own advantages. For many pipelines and similar systems, the water must be maintained at a specified flow rate to ensure the effective operation of the system.

Water flow meters supplied by Sino-Inst are flow meters that can display the flow rate and cumulative flow of industrial water pipes. Read more about: 5 Types of Flowmeters-Guide to Flowmeter Types .

Magnetic Water Flow Meter
Remote Magnetic Sewage Flow Meter
In-Line Ultrasonic Flow Meter
Insertion Magnetic Flow Meter
Liquid Turbine Flow Meter
Turbine Sanitary flow meter
Dual Channel Ultrasonic Water Meter
Ultrasonic Clamp on Flow Meter
Magnetic Sanitary Flow Meter
Magnetic Large Dia. Pipe Flow Meter
Handheld Ultrasonic Flow Meter

Extended Reading: Insertion Flowmeter Types

Gas Totalizer Flow Meter

Extended reading: Liquid Bitumen/Asphalt Flow Meter

Digital gas flow meters are flow meters used to monitor the gas flow rate or mass. Digital gas flow meters are designed to measure different types of gases. Like Air, N2, O2, CO2, and more.

The Digital gas flow meters supplied by Sino-Inst all come with Gas Totalizer, so they are also called Gas Totalizer Flow Meter. Such as gas ultrasonic flowmeter, gas turbine flowmeter, etc.

The intelligent gas flow converter is a new type converter with domestic level developed by our company. Adopt advanced ultra-low power consumption single-chip microcomputer technology. The whole machine has strong functions, low power consumption, and superior performance. The flowmeter integrates flow, temperature, and pressure detection functions. And can automatically compensate for temperature, pressure, and compressibility. It is an ideal instrument for gas measurement in petroleum, chemical, electric power, metallurgy, and other industries.

Extended reading: High Pressure Rotameter for Liquids/gas-Upto 25 Mpa

Precession Vortex Gas Flowmeter
Gas Turbine Flow Meter
Vortex Shedding Flow Meter

Frequently
Asked
Questions

Help Center

Flow totalizers are often used in conjunction with flow meters. According to the definition of flow totalizers matched with flow meters, it is like this: with various flow sensors or transmitters, temperature sensors or transmitters and pressure transmitters Coordinated use. It can measure and display, accumulate calculation, alarm control, transmission output, data acquisition and communication for various liquid, steam, natural gas, general gas and other flow parameters. It is a very important accessory instrument for flowmeters. It can be seen that the important role of the flow totalizer.

Extended reading: Volumetric Flow Rate To Mass Flow Rate

At present, there are many different brands of flow totalizers used to measure the instantaneous flow of liquid or solid in the industrial field. Then it is transmitted to the PLC through a 4-20mA signal as a data standard for control or monitoring. PLC accumulates the cumulative flow within a certain period of time according to the instantaneous flow. It is of great significance for the data analysis and production calculation applications of a liquid or solid flow in the field of process industry control.

Extended reading: Ultrasonic Water Meter for Residential Water

Generally, flowmeters have system errors, fixed constants need to be compensated and corrected. There are many types of flowmeters, the principles of various measurement methods are different, the measured medium is different, and the compensation calculation is also different.

For example, the flow meters in the following measurement occasions require temperature or pressure compensation:

  1. When measuring gas, temperature and pressure compensation are required at the same time. The gas is generally settled at the standard condition volume flow rate. Because the volumetric flow rate of gas changes when temperature or pressure changes, the flow rate will change.
  2. When measuring superheated steam, the temperature and pressure need to be compensated at the same time. Steam is generally settled by mass flow rate. Because either temperature or pressure has changed. The density of the steam will change. The mass flow rate also changes accordingly.

Extended reading: Orifice Plate Flow Meter

Extended Reading: Metal Tube Flow Meter Applications

Sino-Inst offers over 50 Flow Totalizer Meter & Flow Meter for flow measurement. About 50% of these are differential pressure flow meters, 40% is the liquid flow sensor, and 20% are Ultrasonic Level Transmitter and mass flow meters.

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

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

Request a Quote

Please enable JavaScript in your browser to submit the form

Explore Oil and Gas Flow Meters

Posted on by

An oil and Gas Flow Meter is A device installed in a pump manifold or treating line to measure the fluid flow rate. Oil and Gas Flow Meters can be used to measure the flow rates of liquid or gas and are available in various configurations and with different operating principles.

Technical Support More Flowmeters

Flow Meters for Measuring Oil and Gas

Every day, a large amount of oil and gas are transported back and forth, refined, and then transported, as well as custody transfer. Difficult oil and gas flow measurement challenges such as corrosive media and harsh environments are our daily work. This requires mature and safe technology. Through instrument measurement and display monitoring, safe and reliable operation can be achieved.

Many types of flow meters are used to measure oil and gas flow. Each type has its advantages and disadvantages. The following content discusses these advantages and disadvantages.

Magnetic Water Flow Meter
Turbine Sanitary flow meter
Low temperature Turbine Flowmeter-Liquid Nitrogen Flow Meter
Handheld Ultrasonic Flow Meter
U-Series Liquid Mass Flow Meter
Gear flow meter for Micro flow
Gas Thermal Mass Flow Meter
Vortex Steam Flow Meter
Precession Vortex Gas Flowmeter
Metal Tube Rotameter
Orifice Plate Flow Meter
Vortex Shedding Flow Meter

A Coriolis flowmeter is a type of mass flow meter. It is designed differently and works differently than thermal or differential mass flow meters. Coriolis meters provide extremely accurate mass or volume flow, density, and temperature measurement with few moving parts and no straight pipe requirements.

Coriolis flowmeter is also called Coriolis mass flow meter. Based on the principles of Micromotion mechanics. Coriolis meters provide extremely accurate mass or volume flow, density, and temperature measurements.

Advantages

  • The Coriolis mass flow meter directly measures the mass flow rate with high measurement accuracy.
  • It can measure a wide range of fluids, including high-viscosity liquids, slurries containing solids, liquids containing trace gases, and medium and high-pressure gases with sufficient density.
  • The measuring tube has a small vibration amplitude and can be regarded as a non-moving part, and there are no obstructions and moving parts in the measuring pipe.
  • It is not sensitive to the flow velocity distribution of the upflow, so there is no requirement for upstream and downstream straight pipes.
  • The measured value is not sensitive to the fluid viscosity, and the change of fluid density has little effect on the measured value.
  • Multi-parameter measurement can be done, such as measuring density at the same time, and deriving the concentration of solute in the measurement solution from this.

Disadvantages

  • The instability of the zero point of the Coriolis mass flowmeter forms a zero point drift. This affects the further improvement of its accuracy. Many types of meters have to divide the total error into two parts, the basic error and the zero point instability measurement.
  • Coriolis mass flowmeters cannot be used to measure low-density media and low-pressure gases. The gas content in the liquid exceeds a certain limit (depending on the model), which will significantly affect the measured value.
  • Coriolis mass flowmeters are more sensitive to external vibration interference. In order to prevent the influence of pipeline vibration, most models of Coriolis mass flowmeters have high requirements for installation and fixation of flow sensors.

Extended Reading: Magnetic Battery Operated Flow Meter

The ultrasonic flow meter measures the liquid flow rate quickly and effectively. There are two types of ultrasonic flowmeter technology: Doppler frequency shift and transit time.

Transit time ultrasonic flow meter is most suitable for measuring the flow of cleaning liquid. Therefore, it is the most popular type of ultrasonic meter.

Doppler ultrasonic flow meter can measure the frequency difference of sound waves reflected from bubbles or particles in the airflow. It is suitable for aerated or dirty liquids.

Advantages

  • The clamp-on ultrasonic flowmeter can realize non-contact flow measurement. Even if it is a plug-in or internally attached ultrasonic flowmeter, its pressure loss is almost zero. The convenience and economy of flow measurement are the best.
  • The ultrasonic flowmeter can measure various media of water, gas and oil. Its application field is very broad.
  • The manufacturing cost of the ultrasonic flowmeter has almost nothing to do with the caliber. It has the comprehensive competitive advantage of reasonable price and convenient installation and use in the occasion of large-diameter flow measurement.
  • The portable ultrasonic flowmeter can measure the flow rate on pipelines of various pipe diameters and materials with one flowmeter. It is the preferred flow meter type for online calibration, comparison or period verification as a standard meter.
  • Ultrasonic flowmeter has the convenience of traceability based on the two basic physical quantities of length and time. It can be foreseen that it will surpass other principles of flow meters to become the carrier of flow standards or even flow standards.

Extended reading: non contact flow meter

Disadvantages

  • The current disadvantage of ultrasonic flowmeters is mainly that the temperature range of the measurable fluid is limited by the temperature resistance of the ultrasonic transducer and the coupling material between the transducer and the pipeline. And the raw data of the sound transmission velocity of the measured fluid at high temperature is incomplete. At present, our country can only be used to measure fluids below 200°C.
  • The anti-interference ability is poor, and it is susceptible to the influence of bubbles, fouling, pumps, and other ultrasonic noises, resulting in poor accuracy. If the above situation occurs, the accuracy will deteriorate in the slightest, and the meter will not display in the severe case.
  • The measurement circuit of the ultrasonic flowmeter is more complicated than that of the general flowmeter. This is because the flow velocity of liquid in general industrial measurement is often a few meters per second, and the propagation speed of sound waves in the liquid is about 1500m/s.

Extended reading: Ultrasonic Flow Meters Types & Technical Guide

A vortex flow meter is also called a Vortex shedding flow meter. Vortex Flow Meter is suitable for flow measurement of steam and various liquids and gases.

The vortex flowmeter is a volume flow meter that measures the volume flow of gas, steam, or liquid, the volume flow of standard conditions, or the mass flow of gas, steam, or liquid based on the Karman vortex principle. When the fluid flows through the dust collector rod of the vortex flowmeter, a vortex is formed. The frequency of vortex shedding is proportional to the fluid velocity. Temperature and pressure compensation can be configured.

Advantages

  • The vortex flowmeter has no moving parts, and the measuring element has a simple structure, reliable performance and long service life.
  • The vortex flowmeter has a wide measuring range. The turndown ratio can generally reach 1:10.
  • The volume flow of the vortex flowmeter is not affected by thermal parameters such as the temperature, pressure, density or viscosity of the fluid being measured. Generally, no separate calibration is required. It can measure the flow of liquid, gas or steam.
  • The pressure loss caused by it is small.
  • The accuracy is high. The repeatability is 0.5%. And the amount of maintenance is small.

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

Disadvantages

  • The volume flow of the vortex flowmeter in working state is not affected by thermal parameters such as the temperature, pressure, and density of the fluid being measured. But the final measurement result of liquid or steam should be mass flow. For gases, the final measurement result should be the standard volume flow rate. Both the mass flow rate or the standard volume flow rate must be converted by fluid density, and changes in fluid density caused by changes in fluid working conditions must be considered.
  • Poor vibration resistance.
  • Poor adaptability to measuring dirty media. The generating body of the vortex flowmeter is easily dirty by the medium or entangled by the dirt. Change the size of the geometry. Greatly affect the measurement accuracy.
  • High requirements for straight pipe sections. Experts pointed out that the straight pipe section of the vortex flowmeter must ensure the front 40D and the 20D to meet the measurement requirements.
  • Poor temperature resistance. Vortex flowmeters generally can only measure the fluid flow of media below 300°C.

A thermal gas mass flow meter is a flow meter that can detect the mass flow of gas without temperature and pressure compensation.

Thermal Mass Flow Meter Unaffected by changes in viscosity, density, temperature, or pressure. Thermal 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.

Advantages

  • Wide turndown ratio. It can measure gas with flow velocity as high as 100Nm/s to 0.5Nm/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 the 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, or HART communication, factory automation and integration can be realized.

Disadvantages

  • The response is slow, and the measured gas composition changes greatly, and the measured value will change greatly due to the change of cp value and thermal conductivity, which will cause errors.
  • For small flow rates, the meter will bring considerable heat to the gas being measured.
  • For thermally distributed thermal gas mass flow meters, if the measured gas deposits on the tube wall affects the measured value, it must be cleaned regularly; for thin tube meters, it is more prone to clogging and cannot be used under normal circumstances.
  • The use of pulsating flow will be limited.
  • Thermal mass flow meters for liquids are also restricted in the use of viscous liquids.

Extended reading: Gas Mass Flow Meter

Differential Pressure Flow Meter is also called DP flow meter. Differential pressure flow meters use the principle of differential pressure to measure the flow of liquid, gas, and steam.

The differential pressure flow meter is measured by the working principle that there is a certain relationship between the pressure difference and the flow rate when the medium fluid flows through the throttling device. Differential pressure (DP) flow meters are the most widely used form of flow measurement products today. Including integrated orifice flowmeter, average velocity tube flowmeter, venturi tube, wedge flowmeter, underwater flowmeter, orifice plate, orifice carrier assembly, nozzle flowmeter.

Advantages

  • The most widely used, such as orifice flowmeter, has a firm structure and stable and reliable performance;
  • It has a wide range of applications and is still the most used type of flowmeter;
  • The detection parts, transmitters and display instruments can be produced by different manufacturers, which is convenient for large-scale production.

Extended reading: Orifice Plate Flow Meter

Disadvantages

  • The measurement accuracy is unstable. Affected by installation and fluid impact (such as orifice plate, nozzle flowmeter) is prone to wear. In turn affect the accuracy of measurement data;
  • The range is narrow, generally 3:1~4:1;
  • On-site installation conditions require high requirements, and inaccurate installation will have a greater impact on measurement accuracy;
  • The pressure loss is large.

A positive displacement flowmeter as a mechanical flow meter is a common type of Volumetric Flow Meter. It can measure the volume flow of high viscosity and corrosive fluids.

  • High measurement accuracy;
  • The installation pipeline conditions have no influence on the measurement accuracy;
  • Can be used for high-viscosity liquids;
  • Wide range;
  • The direct-reading meter can directly obtain the cumulative and total amount without external energy.
  • Clear and clear, easy to operate.

Advantages

  • The measurement accuracy is high, and the basic error is generally ±0.5%R. Special ones can reach ±0.2% R or higher. It is especially suitable for use in the field where high-precision measurement is required.
  • There is no influence on the measurement accuracy when measuring the distortion of the flow velocity field of the rotating flow and the pipe choke. There is no requirement for the front straight pipe section.
  • Can be used for the measurement of high-viscosity fluids. Wide flow range. Generally, it is 10:1 to 5:1, and can reach 30:1 or more in special cases.
  • With on-site flow direct reading. No external power supply is required. The cumulative total can be measured, the display is clear, and the operation is convenient.

Extended reading: Positive Displacement Flow meter Technology

Disadvantages

  • The design of the measurement structure is complicated. The flowmeter is large and heavy, especially the flowmeter with larger caliber. Huge volume, only suitable for small and medium calibers.
  • Compared with other general flow meters (such as orifice flow meters, float flow meters, electromagnetic flow meters, vortex flow meters). The measured medium type, medium working condition (temperature, pressure), and caliber are relatively limited, and the scope of application is narrow.
  • Only suitable for clean single-phase fluids. When the fluid contains particles and dirt, a filter must be installed upstream. Not only increases the pressure loss, but also increases the maintenance work. If measuring liquids containing gas, a gas separator must be installed.

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.

Advantages

  • The cost is moderate.
  • Very good at clean, low viscosity fluids of moderate velocity and a steady rate.
  • Turndown is very good as it can read very low compared to the greatest flow.
  • They are reliable if put in a clean fluid especially if it has some lubricity.
  • AGA and API approved for custody transfers.
  • They do cause some pressure drop where that may be a factor such as gravity flows.
  • High accuracy. Among all flowmeters, it is the most accurate flowmeter.
  • No zero drift, good anti-interference ability.
  • High accuracy. Among all flowmeters, it is the most accurate flowmeter.
  • No zero drift, good anti-interference ability.

Disadvantages

  • Not reliable for steam.
  • Bearings wear out.
  • Requires constant backpressure to prevent cavitation.
  • Accuracy adversely affected by bubbles in liquids.
  • Turbine meters can be used with clean liquids and gases only (may need to install a strainer upstream to prevent damage from particulates).
  • Not applicable for measuring corrosive fluids.
  • May not function properly with high viscosity fluids where the flow profile is laminar.
  • Cannot maintain calibration characteristics for a long time.

Extended Reading: Summary Of Crude Oil Flow Measurement Options

Extended Reading: Petroleum Flow Meter

Crude Oil Flow Meter

To measure crude oil, you can also consider the oval gear flowmeter first. If the precision is extremely high. Then you can use a mass flow meter.

The first mass flowmeter is required to measure the flow of crude oil in the supply pipe to the primary oil refining. The mass flow rate here is 1600 t/h.

The second meter is used to measure black oil in the pipeline to the Commodity and Raw Materials Park.

Additionally, the customer required simple installation, high accuracy, and smooth integration of the new meters into existing systems.

Extended reading: Oil Level Measurement Solutions for the Oil & Gas Industry

Flare Gas Mass Flow Measurement

The measurement of flare gas flow has always been the requirement of refinery, petrochemical, chemical and other various factories. Better measurement of flare gas flow. It can not only alleviate the pressure of enterprise safety management, but also reduce material loss, which is of great significance. However, there are many difficulties in flare gas measurement. Take a look at the following different measurement methods, there is always one that suits you.

Flare gas flow measurement method

There are three main methods to measure the flow of flare gas. These methods include the following types of flow meters:

  • Ultrasonic flowmeter
  • Thermal flow meter
  • Differential pressure flowmeter

In global gas flow measurement applications. The growth rate of flare gas flow measurement is ranked second. With the increasingly stringent environmental requirements, the demand for flare gas measurement will continue to increase. In this field, ultrasonic flow meters, thermal flow meters, and differential pressure flow meters have their own advantages.

Extended reading: Crude oil measurement, 80G radar level meter should be your first choice!

Frequently
Asked
Questions

Help Center

In the oil and gas industry, there are many items that need to be metered. Generally, monitoring instruments are used. Such as pressure gauges, flow meters, thermometers, etc. These are called meters in the oil and gas industry.

Extended Reading: Fuel Flow Meters for Diesel-Marine fuel-Industrial oil

The main purpose of the Oil flow meter is to measure the volume or mass flow of oil media. Such as commonly used turbine flow meters, gear flow meters, mass flow meters, and so on.

Extended reading: High Temperature Flow Meter

For the measurement of fuel flow. We prefer turbine flowmeters.

Extended reading: Fuel Flow Meter for Boat-Selection & Application

As far as the current industry technology is concerned. Mass flow meters are a type of flow meter with relatively high accuracy.

Extended Reading: Metal Tube Flow Meter Applications

The flow meter is a device installed in a pump manifold or treating line to measure the fluid flow rate. Flowmeters can be used to measure the flow rates of liquid or gas and are available in various configurations and with different operating principles.

Extended reading: Ultrasonic flow detectors types

Recent Oil & Gas Blog Posts

Oil and Gas Flow Meter Selection Conclusions

As long as there is commercial oil and gas extraction, the industry faces the challenge of accurate measurement. From allocating production to the stakeholders of each well to monitoring the oil and gas delivered. Everyone in the oil and gas industry has a vested interest in ensuring that flow rates are measured correctly.

Over the years, this has spawned a variety of metering technologies. The growth of the oil and gas market has in turn generated demand for different flowmeter types.

Before you choose the right Oil and Gas Flow Meters, you need to consider many factors. If you need technical support, please contact our engineers.

Extended Reading: Collection of Industrial Insertion Flowmeter Type

Sino-Inst’s Oil and Gas Flow Meter 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 Oil and Gas Flow Meters, like: gas turbine flow meter. vortex flowmeter, thermal mass flow meter, and more.

Sino-Inst’s Oil and Gas 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.

Request a Quote

Please enable JavaScript in your browser to submit the form

Velocity Flow Meters

Posted on by

What is a velocity flow meter?

Velocity Flow Meter is a flow meter that obtains flow parameters by directly measuring the flow rate of the full pipe in the closed pipe section. The flow rate can be calculated by measuring the velocity of the flow by using a velocity flow meter. Velocity flow meters mainly include-electromagnetic, ultrasonic, turbine, vortex, precessing vortex, rotor, etc.

LEARN MORE

Flow Meter Types

There are many types of flow meters. Basically, there are the following types of flow meters

  • Volumetric type: waist wheel, oval gear, piston, etc.
  • Velocity type: electromagnetic, ultrasonic, turbine, vortex street, precession vortex, rotor, etc.
  • Differential pressure type: orifice, bar type such as annubar, V cone, wedge type, elbow, nozzle, target type, etc.
  • Variable area: rotors, open channels, etc.
  • Quality: Coriolis, thermal type, etc.

Why are there so many types of flow meters? This starts with the working conditions of the factory. The three elements of working conditions, medium, temperature, pressure, and conditions are ever-changing. Create thousands of types of working conditions. It requires different principles and different types of flow meters.

Extended reading: Integral DP Flow Meter|Gas, liquid, steam|Compact structure

Velocity Flow Meter Types

A magnetic Flow Meter is a flow meter that measures the flow of conductive fluids. Abbreviated as EMF, also called Electromagnetic flowmeters. It is a kind of Volumetric flow meter. A magnetic flow meter measures the velocity of conductive liquids moving through a pipe or conduit. In the wastewater treatment industry, a Magnetic Flow Meter is the best flow meter choice.

Advantages of using Electromagnetic Flow Meters.

  • High precision and stability
  • Self-check
  • Two-way measurement
  • No pressure loss
  • No moving parts
  • May be for sanitary purposes
  • Large size available
  • Dirty liquid and mixed fructose are ok

Disadvantages of using Magnetic Flow Meters

  • Can not be used to measure gas, steam and liquids containing a lot of gas;
  • Cannot be used to measure liquid media with very low conductivity.
  • Cannot be used to measure high temperature media. At present, it is restricted by the lining material and electrical insulation material of the measuring tube of the electromagnetic flowmeter for general industry;
  • The electromagnetic flowmeter is easily affected by external electromagnetic interference.

The ultrasonic flow meter measures the liquid flow rate quickly and effectively. There are two types of ultrasonic flowmeter technology: Doppler frequency shift and transit time.

Transit time ultrasonic flow meter is most suitable for measuring the flow of cleaning liquid. Therefore, it is the most popular type of ultrasonic meter.

Doppler ultrasonic flow meter can measure the frequency difference of sound waves reflected from bubbles or particles in the airflow. It is suitable for aerated or dirty liquids.

Extended reading: Ultrasonic flow detectors types

Advantages of Ultrasonic Flow Meters

  • Ultrasonic flowmeter is a non-contact measuring instrument, which can be used to measure the flow of fluids and large pipe diameters that are not easy to contact and observe. It does not change the fluid flow state, does not produce pressure loss, and is easy to install.
  • It can measure the flow of strong corrosive media and non-conductive media.
  • Ultrasonic flow meters have a large measuring range, with pipe diameters ranging from 20mm to 6m.
  • Ultrasonic flowmeter can measure the flow of various liquids and sewage.
  • The volume flow measured by the ultrasonic flowmeter is not affected by the temperature, pressure, viscosity and density of the fluid being measured. It can be made into fixed and portable forms.

Disadvantages of Ultrasonic Flow Meters

  • The temperature measurement range of an ultrasonic flowmeter is not high, and generally it can only measure fluids with a temperature lower than 200°C.
  • Poor anti-interference ability. It is susceptible to the interference of bubbles, fouling, pumps and other sound sources mixed with ultrasonic noise, which affects the measurement accuracy.
  • The straight pipe section has strict requirements, 20D in the front and 5D in the back. Otherwise, the dispersion is poor and the measurement accuracy is low.
  • Uncertainty in installation will bring large errors to flow measurement.
  • The fouling of the measuring pipe will seriously affect the accuracy of the measurement and bring about significant measurement errors. Even in severe cases, the meter has no flow display.
  • Reliability and accuracy are not high (generally around 1.0-2.5), and repeatability is poor.

Extended reading: Make Ultrasonic Open Channel Flow Meter Work for You

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.

Turbine Meter Advantages

  • The cost is moderate.
  • Very good at clean, low viscosity fluids of moderate velocity and a steady rate.
  • Turndown is very good as it can read very low compared to the greatest flow.
  • They are reliable if put in a clean fluid especially if it has some lubricity.
  • AGA and API approved for custody transfers.
  • They do cause some pressure drop where that may be a factor such as gravity flows.
  • High accuracy. Among all flowmeters, it is the most accurate flowmeter.
  • No zero drift, good anti-interference ability.
  • High accuracy. Among all flowmeters, it is the most accurate flowmeter.
  • No zero drift, good anti-interference ability.

Turbine Meter Disadvantages

  • Not reliable for steam.
  • Bearings wear out.
  • Requires constant backpressure to prevent cavitation.
  • Accuracy adversely affected by bubbles in liquids.
  • Turbine meters can be used with clean liquids and gases only (may need to install a strainer upstream to prevent damage from particulates).
  • Not applicable for measuring corrosive fluids.
  • May not function properly with high viscosity fluids where the flow profile is laminar.
  • Cannot maintain calibration characteristics for a long time.

Extended reading: Turbine Insertion Flow Meter for Large Diameter Pipeline

A vortex flow meter is also called Vortex shedding flow meter. Vortex Flow Meter is suitable for flow measurement of steam and various liquids and gases.

The vortex flowmeter is a volume flow meter that measures the volume flow of gas, steam, or liquid, the volume flow of standard conditions, or the mass flow of gas, steam, or liquid-based on the Karman vortex principle. When the fluid flows through the dust collector rod of the vortex flowmeter, a vortex is formed. The frequency of vortex shedding is proportional to the fluid velocity. Temperature and pressure compensation can be configured.

Extended reading: Vortex Steam Flow Meter

Advantages of vortex flowmeter

  • The pressure loss is small, about 1/4 to 1/2 of the throttling differential pressure flowmeter.
  • Output a pulse signal proportional to the flow rate, without zero drift.
  • The structure is simple, firm, easy to install and maintain. There is no need for pressure guiding pipe and three-valve group, etc., reducing leakage, blockage and freezing. The measuring element has simple structure, reliable performance and long service life.
  • The accuracy is high, generally ±(1～1.5)%R.
  • The measuring range is wide, the vortex flowmeter with a reasonable caliber is determined, and the range can reach 20:1.
  • Within a certain Reynolds number range, the output frequency of the orifice flowmeter is not affected by the physical properties (density, viscosity) and composition of the fluid, that is, the meter coefficient is only related to the shape and size of the vortex generator and the pipeline.
  • The volume flow of the vortex flowmeter is not affected by thermal parameters such as the temperature, pressure, density or viscosity of the fluid being measured. Generally, no separate calibration is required. It can measure the flow of liquid, gas or steam.

Understanding the relationship between Flow Rate and Pressure may help you calculate mass or volume flow.

Disadvantages of vortex flowmeter

(1) The volume flow of the vortex flowmeter is not affected by the temperature, pressure, density and other thermal parameters of the measured fluid, but the final measurement result of liquid or steam should be the mass flow. For gas, the final measurement result Should be the standard volume flow. Both the mass flow rate or the standard volume flow rate must be converted by fluid density, and changes in fluid density caused by changes in fluid working conditions must be considered.

(2) The main factors that cause flow measurement errors are: measurement errors caused by uneven flow velocity of the pipeline; the density of the medium when the fluid working condition changes cannot be accurately determined; the wet saturated steam is assumed to be dry saturated steam for measurement. If these errors are not limited or eliminated, the total measurement error of the vortex flowmeter will be very large.

(3) Poor vibration resistance. External vibration will cause measurement errors of the vortex flowmeter, or even fail to work normally. The high-velocity impact of the channel fluid will cause additional vibration to the cantilever of the vortex generator, which will reduce the measurement accuracy. The influence of large pipe diameter is more obvious.

(4) Poor adaptability to measuring dirty media. The generating body of the vortex flowmeter is very easy to be dirty by the medium or entangled by the dirt, and the change of the geometric body size has a great influence on the measurement accuracy.

(5) High requirements for straight pipe sections. Experts pointed out that the straight pipe section of the vortex flowmeter must ensure the front 40D and the 20D to meet the measurement requirements.

(6) Poor temperature resistance. Vortex flowmeters generally can only measure the fluid flow of media below 300°C.

Extended Reading: Collection of Industrial Insertion Flowmeter Type

More about Different Types of Flowmeters – Technical and Application Analysis.

Area Velocity Flow Meter

Variable area flow meters are flow meters in which the fluid must pass through a restricted area. Because the flow cross-sectional area of ​​the flow meter varies with the height of the float. Therefore, this type of flowmeter is called variable area flowmeter or equal pressure drop flowmeter. The typical instrument of this type of flowmeter is a rotameter. This is in contrast to flow meters such as orifice plates and venturi tubes, where the area of ​​the flow element remains fixed. Variable area flowmeters can measure of gas and fluid flow.

Variable area flow meter advantages and disadvantages

  • The advantages of the variable area flow meter are simple structure and easy testing, suitable for measuring small flow.
  • The disadvantage of variable area flow meter is that it is easily affected by factors such as fluid density, pressure, and viscosity. When testing the flue gas flow, because the flue gas contains dust, the area flowmeter cannot be used.

Extended reading: Fuel Flow Meter for Boat-Selection & Application

Mechanical Flow Meter

Mechanical flow meters are a type of flow meters that use arrangement moving parts to measure flow. The fluid passes through a series of gears or chambers (positive displacement or PD) or through a rotating turbine or rotor. Mechanical flowmeter is different from electromagnetic and ultrasonic in principle. Mechanical flow meters easily monitor liquid flow rates for water, fuels, viscous fluids and more.

Guess you like: What is Reynolds number?

Extended reading: Mechanical flow meter types

Frequently
Asked
Questions

Help Center

The normal pipeline flowmeter can directly measure the flow rate of the fluid. If it is a river, open channel, etc. Then you need to use a special flow meter to measure.

Extended reading: Orifice Plate Flow Meter

What is a Flow Meter and how does it work?

Video source: https://www.youtube.com/embed/_pL7bGEF52s?start=2

A flow meter (or flow sensor) is an instrument used to measure the linear, nonlinear, mass, or volumetric flow rate of a liquid or a gas. When choosing flow meters, one should consider such intangible factors as familiarity of plant personnel, their experience with calibration and maintenance, spare parts availability, and mean time between failure history, etc., at the particular plant site.

It is also recommended that the cost of the installation be computed, only after taking these steps different sensors include dial, in-line, ultrasonic, orifice plate, totalizing meters, variable area, venturi, or with switch output. The different designs of the flow meters have a variety of applications.

Extended reading: V-Cone Flow Meter Applications

Extended Reading: Inline Ultrasonic Flow Meter

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

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

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

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Velocity 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.

Request a Quote

Please enable JavaScript in your browser to submit the form

Strap on Ultrasonic Flow Meters

Posted on by

What is Strap on Ultrasonic Flow Meters?

Strap on Ultrasonic Flow Meter is also often called Clamp On Type Flow Meter. The unique feature of Strap on Ultrasonic Flow Meter is that the sensor does not need to be in contact with the medium, which is different from other flow meters.

  • Clamp on type, No need to cut the pipe or do any other changes.
  • No professional product knowledge required, installation and measurement can be done based on the guide.
  • No moving parts or pressure changes involved, installation can be done without stop provide.
Get a Quote Ultrasonic Flow Meters

Featured Strap on Ultrasonic Flow Meters

Portable Ultrasonic Flow Meter
Handheld Ultrasonic Flow Meter
Clamp on Ultrasonic Flow Meter
Ultrasonic Clamp on Flow Meter
Strap on flow meter X3

Strap on Ultrasonic Flow Meter Working Principle

The strap-on ultrasonic flow meters supplied by Sino-Inst are based on the working principle of the time difference method.

Transit Time Ultrasonic Flow Meter adopts the measurement principle of the time difference method. It uses the ultrasonic wave emitted by the sensor to propagate in the flowing fluid. The sound wave propagation speed in the downstream direction will increase, and the backward direction will decrease. In the same propagation distance, there will be different transmission times. According to the difference between the transmission time and the measured The relationship between fluid velocity measures the fluid velocity.

The flow rate of the fluid is different in different positions in the tube. The flow rate in the center of the tube is faster than the flow rate near the wall of the tube. The flow velocity distribution of the fluid in the pipeline can be represented by the flow velocity cross-sectional distribution diagram.

By setting the flowmeter and considering the cross-sectional distribution of the flow velocity, the average flow velocity can be calculated. Then the volume flow of the fluid can be obtained according to the cross-sectional area of the pipe.

Notes:
V measure fluid velocity
M ultrasonic reflection times
D pipe diameter
θ The angle between the ultrasonic signal and the fluid
T up The time when the downstream sensor transmits the signal to the upstream
T down Time from upstream sensor to downstream
ΔT = T up – T down

Guess You’ll Like: Ultrasonic flow meters types & technical guide

Strap on Ultrasonic Flow Meters Application

Sino-Inst concentrates on the development of flow measurement technology. The products serve real-time flow measurement and participation process control in the production process. The main customer industries are the chemical production process, fine chemical production, cleaning industry, beverage industry, etc.

With the world’s most advanced time measurement chip (time resolution of 50ps), Sino-Inst has developed a series of straps on ultrasonic flow meters.

It takes only 2-3 minutes to complete the whole process from installation to measurement. It also adopts the current popular OLED display, which makes it easy to read in low light conditions.

Strap on Ultrasonic Flow Meters is widely used in the production process flow measurement and monitoring. The application of the product continuously and effectively controls the flow of the fluid, so as to improve the yield of the product and even save the input of the personnel, bringing benefits to the production enterprise.

Strap on Ultrasonic Flow Meters can meet different pipe requirements: stainless steel pipe, carbon steel pipe, copper pipe, plastic pipe(PVC, PVDF, PPR, PPH, HDPE, etc.).

Extended reading: non contact flow meter

Strap on Ultrasonic Flow Meters also satisfies different clean fluid measurements: various acids, alcohols, chemical solvents, alcohol, beverage water, Coca-Cola water, etc. Strap on Ultrasonic Flow Meters output signal, such as 4-20mA. The flow signal can be connected to a paperless recorder. Carry out multi-channel flow signal monitoring. What Is A Paperless Recorder?

Extended reading: Fluid flow meter types

Extended reading: Battery operated electromagnetic flow meter-GRPS-new irrigation water flow meter

Installation Guidelines

Strap-on-flow-meter-X3-installation-guidelinesDownload
Clamp-on-flow-transducerDownload
Ultrasonic-Flow-meter-User-ManualDownload

Frequently
Asked
Questions

Help Center

Ultrasonic Clamp-on Flow Meter is composed of an integrated host and external clamp-on sensors. Clamp-on Flow Sensors are available at room temperature and high temperature.

High Accuracy measuring:

Linearity: better than 0.5%, Repeatability: better than 0.2%, Accuracy: better than ±1% 

Extended reading: Ultrasonic flow detectors types

Classification of ultrasonic flowmeters.

  1. According to the measurement principle

(1) Time difference method ultrasonic flowmeter;
(2) Frequency difference method ultrasonic flowmeter;
(3) Phase difference method ultrasonic flowmeter;
(4) Doppler ultrasonic flowmeter;
(5) Ultrasonic flowmeters for partially full pipes and river channels that combine liquid level measurement and average flow velocity measurement.

More about Different Types of Flowmeters – Technical and Application Analysis

  1. According to the way of use

(1) Portable ultrasonic flowmeter;
(2) Fixed (standard pipe section) ultrasonic flowmeter.

  1. According to the installation method of the transducer

(1) Standard pipe section ultrasonic flowmeter;
(2) Clip-on ultrasonic flowmeter;
(3) On-site hole-opening plug-in ultrasonic flowmeter.

Read more: Insertion Type Ultrasonic Flow Meter Applications

  1. According to whether the transducer is in contact with the fluid

(1) Immersion (contact) ultrasonic flowmeter;
(2) Non-invasive (non-contact) ultrasonic flowmeter.

  1. According to the nature of the measured fluid

(1) Liquid ultrasonic flowmeter;
(2) Gas ultrasonic flowmeter.

  1. According to the number of transducer channels

(1) Mono ultrasonic flowmeter;
(2) Two-channel ultrasonic flowmeter;
(3) Multi-channel ultrasonic flowmeter.

Extended reading: High Pressure Rotameter for Liquids/gas-Upto 25 Mpa

Doppler ultrasonic flowmeter is widely used in industry, water conservancy, irrigation, and other industries. It is suitable for flow measurement of full pipe, partial pipe, open channel, etc.

(1) Branch channel flow monitoring (narrow channel)

Water distribution in the irrigation area requires real-time monitoring of the branch canal water level and flow. The traditional method is to measure the water level method. This method has high civil construction costs. The monitoring efficiency is low. The measurement accuracy is not enough.

Doppler ultrasonic flowmeter solves the problem of water measurement in-branch canals in irrigation areas.

Just fix the probe at the bottom of the channel. The device automatically measures the channel water level, flow area, and flow rate in real-time and calculates the instantaneous flow and cumulative flow. The flow rate measurement accuracy can reach ±1%+±1cm/s.

(2) Main channel flow monitoring (wide channel)

The difference between the main canal and the branch canal is that the width of the main canal is wider. Therefore, it is necessary to install multiple sets of Doppler ultrasonic flowmeters to accurately measure the flow velocity at different positions of the section during the operation.

The flow of the entire channel can be accurately measured through the integration method. This method is also applicable to some wide rivers.

(3) Monitoring of urban drainage pipeline flow

With the implementation of smart municipal administration, in order to monitor the operation of urban drainage pipe networks, municipal departments need to monitor the water level and flow of drainage pipes in real-time.

Through the analysis of the water level and flow data, the problems of siltation, overload, overflow, and abnormal water infiltration in the pipeline can be distinguished.

Extended reading: Make Ultrasonic Open Channel Flow Meter Work for You

Extended reading: metal tube flow meter

Sino-Inst, Manufacturer for Strap on Ultrasonic Flow Meters. It can measure a single sound-conducting liquid medium of DN 5—6000mm. It can measure even liquids such as water, seawater, oil, and slurry.

Sino-Inst’s Strap on Ultrasonic Flow Meters, 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.

4-20ma Flow Meters

Posted on by

What is 4-20ma Flow Meter?

4-20mA Flow Meters are those flow meters with 4-20mA current signal output function. The signal current of general instruments is 4-20mA. This means that the minimum current is 4mA and the maximum current is 20mA. Our commonly used electromagnetic flowmeters, turbine flowmeters, mass flowmeters, gas flowmeters, etc. all have the function of 4-20mA signal output.

Get a Quote Digital Flow Meters

What is a 4-20mA Output？

The signal current of general instruments is 4-20mA, which means that the minimum current is 4mA and the maximum current is 20mA.

The industry generally needs to measure various non-electrical physical quantities. For example, temperature, pressure, speed, angle, etc. They all need to be converted into analog electrical signals before they can be transmitted to the control room or display equipment hundreds of meters away. This device that converts physical quantities into electrical signals is called a transmitter. The most widely used in the industry is to use 4-20mA current to transmit analog quantities.

In the industrial field, to complete signal conditioning and long-term transmission, the following problems will occur:

  1. Since the transmitted signal is a voltage signal, the transmission cable will be interfered by noise;
  2. The distributed resistance of the transmission cable will produce a voltage drop;
  3. How to provide the working voltage of the instrumentation amplifier in the field is also a problem.

In order to solve the above problems and avoid the influence of related noise, we will use current to transmit signals. Because the current is not sensitive to noise.

The 4-20mA current loop uses 4mA to represent the zero signal. Use 20mA to represent the full scale of the signal. The signals lower than 4mA and higher than 20mA are used for various fault alarms.

Why Choose 4-20mA Instead of 0-20mA for the Flowmeter?

Many people will certainly ask: Why choose 4-20mA instead of 0-20mA?
Very simple, if 0 is the smallest, then the open circuit fault will not be detected!

So, why is it 4mA?
During normal operation, the current signal will not be lower than 4mA.
When the transmission cable is broken due to a fault, the loop current drops to zero. 2mA is often used as the disconnection alarm value.
There are two reasons. One reason is to avoid interference. Another reason is that a two-wire system is used at 4-20mA. That is, the two wires are the signal wires. It is also a power cord. And 4mA is to provide the static working current of the circuit to the sensor.

Extended Reading: Mechanical flow meter for diesel

How Does This 4-20mA Control Loop Work?

4-20mA constitutes the basic elements:

  • 24V power supply
  • The transmitter controls the 4-20mA signal to change in proportion to the process variable
  • The indicator converts the 4-20mA signal into the corresponding process variable
  • Indicator or controller I/O input resistance 250Ω shunt generates 1-5V input signal (Ohm’s law: voltage = current * resistance, 4-20 mA X 250 ohms = 1-5V)

Usually:

  1. They convert the temperature signal of the thermocouple or thermal resistance sensor into a 4-20mA signal and then output;
  2. The controller then translates 4-20mA into a specific temperature value;
  3. Based on this temperature value. The control loop realizes the control of the process terminal control element.

Similarly, the pressure transmitter is in the control loop. Usually used to measure the pressure value of the process medium:

1) The sensor senses pressure. The transmitter converts the signal into 4-20mA signal;
2) The controller then reversely translates the 4-20mA signal into a pressure value;
3) The controller is based on the pressure value. Send instructions to the valve. Control valve opening to realize safety valve control. Ensure that the container does not generate dangerous pressure.

Extended reading: Orifice Plate Flow Meter

Water Flow Meter 4-20ma Output

A Digital Water flow meter is a flow meter that can display the water flow rate, and have the output for the flow rate. Like 4-20mA output, HART, RS 485, and so on. Digital Water Flow Meter is also called Electronic Water Flow Meter. Digital Water Flow Meter is widely used in industrial water and household water measurement. Most of the Sino-Inst flow meters are digital water flow meters. Like the electromagnetic flowmeter, Portable ultrasonic flow meter, Turbine flow meter…..

Magnetic Water Flow Meter
Remote Magnetic Sewage Flow Meter
Liquid Turbine Flow Meter
Dual Channel Ultrasonic Water Meter
Magnetic Sanitary Flow Meter
Handheld Ultrasonic Flow Meter
Insertion Magnetic Flow Meter
Turbine Sanitary flow meter
Ultrasonic Clamp on Flow Meter
Magnetic Large Dia. Pipe Flow Meter
Rotameter flow meter-Variable Area Flow Meters
Insertion Ultrasonic Water Flow Meter

No matter which WaterFlow Meters you choose. The signal output by WaterFlow Meters, such as 4-20mA. The flow signal can be connected to a paperless recorder. Carry out multi-channel flow signal monitoring.

Read More About: Paperless Recorder Working Principle

Flow Meter with Analog Output

The analog flow meter is a flowmeter with the analog output signal. Analog output is a common function of flow meters. The analog signal is mainly used to output the flow signal to the next control system.

The analog signal refers to the continuous signal of the information parameter in a given range. The characteristic quantity of the information of the analog signal can be transformed into an arbitrary numerical signal in an instant. In the process of transmitting analog signals, the information signals need to be converted into electric wave signals, which are then transmitted through wired or wireless methods.

Analog signal: poor confidentiality, weak anti-interference ability.

Digital signal: strong anti-interference ability and good communication confidentiality.

Read more about Analog Flow Meters.

Turbine Digital 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.

Turbine Flow Meter reference price: USD 200-1700/pc.

4-20ma Air Flow Meter

A digital air flow meter refers to a flow meter that can accurately measure air or compressed air inline. Industrial Digital air flow meters can be divided into mass flow meters or volume flow meters.

Read more about Digital air flow meters.

Frequently
Asked
Questions

Help Center

There are many types of flow meters on the market. There are vortex flowmeters, target flowmeters, electromagnetic flowmeters, thermal gas mass flowmeters, etc. Different industries have different choices of flow meters.

Sewage treatment

Sewage is divided into industrial sewage and domestic sewage
Sewage is a solid-liquid mixed fluid. Industrial wastewater is corrosive due to its complex composition. The measurement is difficult. Most meters cannot make measurements.
The main application instruments for sewage treatment are electromagnetic flow and a small number of open channel flowmeters. There are a variety of linings and electrode materials for electromagnetic flowmeters to choose from. High precision and corrosion resistance, it is the main force for measuring the flow of industrial sewage and domestic sewage.

Chemical Industry

The chemical industry is the most widely used industry for flow meters. Almost all types of flow meters are used in the chemical industry.

  1. When measuring air, steam and other gases. The use of vortex flowmeters is the most common. There are also V cones, orifice plates, etc.;
  2. When measuring viscous oily media. Volumetric meters have good application and measurement effects;
  3. Orifice plate and V cone are the most used for ammonia and liquefied gas measurement;
  4. Measure all kinds of light oil. Such as diesel, gasoline, non-corrosive chemical solvents, etc. Turbine flowmeter is the first choice;
  5. Metal rotor flowmeters are also widely used in the chemical industry. Mainly used in the measurement of small flow and process control;
  6. In the measurement of chemical wastewater, electromagnetic flowmeter is currently the only choice.

Food and pharmaceutical industry

Requirements for flow meters in the food and medicine industry:

  1. High measurement accuracy requirements;
  2. The watch body is made of stainless steel, anti-corrosion and anti-rust;
  3. The quick-loading structure is convenient for cleaning and maintenance.
  4. Sanitary electromagnetic flowmeter
    Mainly measure clean water, fruit juice, emulsion, liquid medicine, etc.
    Usually the clamp type connection is convenient for disassembly and cleaning; the material is stainless steel, and the lining is high temperature resistant FEP, PFA, etc. Because there is no dead angle in the structure, it is convenient for high temperature disinfection, and it is the most widely used.
  5. Vortex flowmeter
    Mainly measure steam, water, beer, edible oil, etc.
    The material is stainless steel, and the flange clamp is used, which is convenient to use. The disadvantage is that the accuracy is slightly worse than that of electromagnetic flowmeters.
  6. Turbine flowmeter
    At present, some manufacturers have introduced sanitary turbine flowmeters, most of which are flange-mounted, but also have a clamp-type structure. The measurement accuracy is equivalent to that of electromagnetics. Because of oil prohibition, sealed bearings must be used, and they must be replaced regularly.

Extended reading: 2 inch Water Flow Meter

For different working principle, We offer different types of flow meters, like:

  • Differential Pressure Flow Meters
  • Orifice Plate
  • Venturi Tube
  • Flow Nozzles
  • The Sonic Nozzle – Critical (Choked) Flow Nozzle
  • Calorimetric Flowmeter
  • Ultrasonic Doppler Flowmeter
  • Positive Displacement Flowmeter
  • Variable Area Flowmeter or Rotameter
  • Velocity Flowmeters
  • Pitot Tubes
  • Electromagnetic Flowmeter
  • Turbine Flowmeter
  • Vortex Flow Meter
  • Thermal Flowmeter
  • Coriolis Flowmeter
  • Mass Flowmeters
  • Open Channel Flowmeters

The flowmeter can be used to measure liquid, gas (vapor), and solid (impulse flowmeter). To meet the needs of process control and metering delivery.

Extended reading: Vortex Steam Flow Meter

A flow meter (or flow sensor) is an instrument used to measure the linear, nonlinear, mass or volumetric flow rate of a liquid or a gas. When choosing flow meters, one should consider such intangible factors as familiarity of plant personnel, their experience with calibration and maintenance, spare parts availability, and mean time between failure history, etc., at the particular plant site.

It is also recommended that the cost of the installation be computed, only after taking these steps different sensors include dial, in-line, ultrasonic, orifice plate, totalizing meters, variable area, venturi, or with switch output. The different designs of the flow meters have a variety of applications.

Read more about Digital flow meter working principle

Related Blogs

Looking for 4-20ma flow meters? The flow meter is a fast, accurate, and reliable permanent linear motion. In Sino-Inst, you can also find other good deals on measurement and analysis instruments and tools! Keep an eye out for promotions and deals, so you get a big saving of 4 20ma flow meters. You can shop for 4 20ma flow meters at low prices.

Extended reading: How to convert a 4-20mA to 0-10V /1-5V signal?

There is a wide variety of 4-20ma flow meter items you can buy, such as turbine water flow meters, ultrasonic flowmeters. Common materials used for 4 20ma flow meters are stainless steel and carbon steel.

Sino-Inst offers over 50 4-20ma flow meters for flow measurement. About 50% of these are differential pressure flow meters, 40% are the liquid flow sensor, and 20% are Ultrasonic Level Transmitter and mass flow meters.

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

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

Request a Quote

Please enable JavaScript in your browser to submit the form

Ultrasonic Flow Detectors

Posted on by

Ultrasonic flow detectors are an important part of ultrasonic flow meters. Ultrasonic flow detectors are also called ultrasonic transducers. Ultrasonic flow detectors measure the volumetric flow of liquid within closed conduits. Ultrasonic flow meters use transit-time differences for measuring flow rates inside pipes from the outside using electronics and digital signal processing technology.

Get a Quote Ultrasonic Flow Meters

Featured Ultrasonic Flow Meters Clamp-on

Portable Ultrasonic Flow Meter
Handheld Ultrasonic Flow Meter
Clamp on Ultrasonic Flow Meter
Ultrasonic Clamp on Flow Meter
Strap on flow meter X3

Features of Ultrasonic Flow Detectors

  • Built-in magnet, which can be directly attached to the pipe;
  • Can be used in strong electromagnetic interference occasions;
  • After the junction box is filled with glue, the protection level is IP68;
  • Complete specifications, divided into three models: large, medium, and small;
  • Measuring pipe diameter range DN15-DN6000;
  • The temperature range is -30~90°℃; -30~160℃
  • The measurement liquid is relatively wide, including water, seawater, slurry or oil, acid and alkali, and other homogeneous liquids;
  • Non-contact measurement method, lightweight and small size;
  • The installation of the clamp-on ultrasonic flowmeter probe is simple. And different sizes of probes can detect pipes of different pipe diameters. Under the condition of ensuring accuracy, the clamp-on ultrasonic flowmeter can measure the smallest pipe of DN15. The largest can measure DN6000 pipeline;
  • The external clamp ultrasonic flowmeter does not need to destroy the pipeline in the process of measuring the flow rate. The probe can directly touch the straight pipe section. No pressure loss. The flow measurement can be performed on the already installed pipe;
  • Suitable for measuring pipes of different materials. Common ones are metal pipes: stainless steel, carbon steel, cast iron, etc., plastic pipes, etc. There are also pipes with better sound-permeable materials.

Optional Ultrasonic Flow Detectors

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
MoeldX3-φ6.35X3-φ9.53 X3-φ12.7X3-φ15X3-φ20X3-φ25
Weight(KG)0.910.910.90.90.840.84
MoeldX3-φ32X3-φ40X3-φ50X3-φ63X3-φ75X3-φ99
Weight(KG)0.820.880.981.431.521.95

Ultrasonic Flow Detectors Working Principle

Ultrasonic Flow Detectors are also called ultrasonic transducers. In fact, it is a piezoelectric ceramic whose frequency is the same as its resonant frequency. It uses the piezoelectric effect of the material to convert electrical energy into mechanical vibration.

Under normal circumstances, ultrasonic waves are first generated by an ultrasonic generator. It is converted into mechanical vibration by the ultrasonic transducer. The ultrasonic wave can be generated by the ultrasonic wave deriving device and the ultrasonic wave receiving device.

Ultrasonic transducers mainly include shell, acoustic window (matching layer), piezoelectric ceramic disc transducer, backing, lead-out cable, receiver, and other parts.

Among them, the piezoelectric ceramic disc transducer plays the same role as a general transducer. It is mainly used to transmit and receive ultrasonic waves, and above the piezoelectric ceramic disc transducer is the receiver. It is mainly composed of lead cables, transducers, metal rings, and rubber washers. Used as an ultrasonic receiver. Receive the Doppler dial-back signal generated outside the frequency band of the piezoelectric ceramic disc transducer.

Ultrasonic transducers are piezoelectric ceramics that resonate at ultrasonic frequencies. The piezoelectric effect of the material converts electrical signals into mechanical vibrations. The ultrasonic transducer is an energy conversion device. Its function is to convert the input electric power into mechanical power (ultrasound) and then transmit it out. , It consumes a small part of its own power.

Types of ultrasonic transducers: can be divided into piezoelectric transducers, sandwich transducers, cylindrical transducers, inverted horn transducers, and so on.

Frequently
Asked
Questions

Help Center

Transit Time Ultrasonic Flow Meter adopts the measurement principle of the time difference method. It uses the ultrasonic wave emitted by the sensor to propagate in the flowing fluid. The sound wave propagation speed in the downstream direction will increase, and the backward direction will decrease. In the same propagation distance, there will be different transmission times. According to the difference between the transmission time and the measured The relationship between fluid velocity measures the fluid velocity.

The flow rate of the fluid is different in different positions in the tube. The flow rate in the center of the tube is faster than the flow rate near the wall of the tube. The flow velocity distribution of the fluid in the pipeline can be represented by the flow velocity cross-sectional distribution diagram.

By setting the flowmeter and considering the cross-sectional distribution of the flow velocity, the average flow velocity can be calculated. Then the volume flow of the fluid can be obtained according to the cross-sectional area of the pipe.

Extended reading: Ultrasonic flow detectors types

Notes:
V measure fluid velocity
M ultrasonic reflection times
D pipe diameter
θ The angle between the ultrasonic signal and the fluid
T up The time when the downstream sensor transmits the signal to the upstream
T down Time from upstream sensor to downstream
ΔT = T up – T down

Guess You’ll Like: Ultrasonic flow meters types & technical guide

Doppler ultrasonic flowmeter uses the physical principle of Doppler frequency shift to measuring the water flow velocity. Therefore, the Doppler ultrasonic flowmeter is suitable for measuring fluids containing solid particles or air bubbles. Not suitable for measuring pure water.

The scope of use includes:
Natural rivers, artificial rivers, farmland channels, urban sewers, corporate sewage outlets, sewage treatment plants, etc.

The products comply with the SL/T 186-1997 standard.

It is suitable for environments that require continuous and accurate measurement of flow rate and flow rate. It has obvious advantages such as convenient installation and maintenance, high reliability, and high precision.

Ultrasonic flow detectors are also called ultrasonic transducers. Or it is often understood by people as an ultrasonic flow sensor.

Ultrasonic flowmeter is an application of ultrasonic, which measures the flow of liquid by applying the speed difference method.

  • Can do non-contact measurement;
  • No flow obstruction measurement, no pressure loss;
  • It can measure non-conductive liquids, which is a supplement to the electromagnetic flowmeter for unobstructed measurement;
  • Except for the pipe section type with measurement, there is generally no need for actual flow calibration;
  • In principle, it is not limited by pipe diameter, and its cost is basically independent of pipe diameter.

Related blogs

Sino-Inst, Manufacturer for Ultrasonic Flow Meters. It can measure a single sound-conducting liquid medium of DN 25—150mm. 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.