Industrial oil flow meters measure the volume or mass of oil. Can realize the mutual conversion of volume and mass.

The main industrial oils are hydraulic oil. Gear Oil. Turbine oil. Compressor oil. Refrigeration oil. Transformer oil. Cylinder oil, heat treatment oil, heat transfer oil, etc. Of course, edible oil can also be produced in the industry. In addition, there are greases with lubricating oil as base oil and thickening agent.

Therefore, whether it is a company that uses, trades, or produces oil, it needs to accurately measure the oil flow.

There are many common oil flow meters, such as turbine flow meters, positive displacement flow meters, gear flow meters, mass flow meters, etc.

Then, we need to choose a suitable flow meter that meets the measurement and budget according to different working conditions.

Oil flow meter digital

Oil flow meter digital refers to an oil flow meter with a local digital display function. The flowmeter can be configured with local digital display, pointer display, and without local digital display. Therefore, it is determined whether the digital display function is needed according to the needs of users.

Explore Oil and Gas Flow Meters

Oil flow meter 4-20ma

The signal output by the flowmeter is generally a pulse signal or a 4-20mA current signal, both of which output instantaneous flow.

The flowmeter voltage signal is unstable. It is simply disturbed during long-distance transmission. The current signal is relatively stable.

The current signal is used in the transmission process, and the voltage signal (the range of voltage value) is used for detailed control in the control instrument (integrator) and DCS system.

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

Mechanical oil flow meter

The mechanical oil flow meter is a type of flow meter. The mechanical flowmeter is a purely mechanical measuring component. Such as turbine flowmeter, rotameter, etc. Relatively speaking, for example, ultrasonic flowmeters use ultrasonic principles instead of mechanical principles. So the ultrasonic flowmeter is not a mechanical flowmeter.

How is oil flow measured?

Oil is generally transported through pipelines. There are many ways to measure oil flow. For example, use the oil tank level difference to calculate the oil flow. Of course, the simplest and most effective way is to use a flow meter.

Although the types of oil flow meters are different, their working principles are different. However, they can all help us achieve a goal. That is to measure and monitor the flow of oil. Instantaneous flow, cumulative flow, etc.

So that we can better control production and trade.

Extended reading: What Is Hydraulic Flow Meter?

Oil flow meter types

At present, the following types of flow meters can be used to measure oil: Turbine flow meters. Gear flow meter. Vortex flowmeter. Ultrasonic flow meter. Mass flowmeter. Differential pressure flow meters.

You can find a suitable flow meter in the appropriate type of oil flow meter according to your needs. Of course, maybe, you don’t know what type of flowmeter you should use.

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

Next, we recommend suitable flow meters for some commonly used oils.

Extended Reading: Petroleum Flow Meter

Of course, the above are just our suggestions. If you need to choose the right flow meter. You can contact Sino-Inst sales engineers. We will provide you with the most suitable measurement solution.

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Sino-Inst offers over 30 Industrial Oil Flow Meters for flow measurement. About 50% of these are Turbine flow meters, 40% is the mass flow sensor, and 20% are DP flow meter.

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

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

Fluid flow meter principle

Principles of mechanics:

• Instruments that belong to this type of principle include differential pressure type and rotor type using Bernoulli’s theorem.
• Impulse type and movable tube type using the momentum theorem.
• Use the direct mass formula of Newton’s second law.
• Target type using the principle of fluid momentum.
• Turbine type using the angular momentum theorem.
• Vortex type and vortex street type using the principle of fluid oscillation.
• Pitot tube type and volume type, weir, trough type, and so on using total static pressure difference.

Principles of Electricity:

Instruments used in this type of principle include electromagnetic, differential capacitive, inductive, strain resistance, etc.

Acoustic principle:

Ultrasonic type is used for flow measurement using acoustic principles. Acoustic type (shock wave type) and so on.

Thermal principle:

There are calorimetric, direct calorimetry, indirect calorimetry, etc., which use thermal principles to measure flow.

Optical principle:

Laser type, photoelectric type, etc. are instruments that belong to this type of principle.

Based on physical principles:

Nuclear magnetic resonance, nuclear radiation, etc. are instruments that belong to this type of principle.

Other principles: There are marking principles (tracing principles, nuclear magnetic resonance principles), related principles, etc.

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

Fluid flow meter types

1. According to the measurement objects, there are two categories: closed pipes and open channels.
2. According to the principle of measurement, there are mechanical principles, thermal principles, acoustic principles, electrical principles, optical principles, atomic physics principles, etc.
3. According to the purpose of measurement, it can be divided into total measurement and flow measurement. The meters are called total meter and flow meter respectively.

Liquid flow meters can be divided into: anti-corrosion flow meters. Liquid flow meters.. Differential pressure flow meters. Ammonia flow meters. Turbine flow meters. Electromagnetic flow meters. Vortex flow meters in fluid oscillating flow meters. Mass flow meters.

Hydraulic fluid flow meter

Industrial Hydraulic oil flow meter, also called hydraulic flow meter gauge. Hydraulic oil flow meters are inline flow meters for hydraulic oil flow measurement.

Sino-Inst offers Turbine, Mass flow, Oval gear, V-cone, Target, and Orifice flow meters for inline hydraulic oil flow. Features like: bidirectional, high pressure, analog, can be customized as customer need.

Extended reading: What Is Hydraulic Flow Meter?

Ultrasonic fluid 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.

Fluid mass flow meter

Fluid mass flow meter directly measures the mass flow of the medium passing through the flow meter. It can also measure the density of the medium and indirectly measure the temperature of the medium.

A flow measuring instrument that measures the mass flow in the pipeline. The measured fluid is under the condition that the pressure, temperature and other parameters change greatly. If only the volume flow is measured, the change in fluid density will bring about a large measurement error.

In positive displacement and differential pressure flowmeters, the density of the fluid to be measured may vary by 30%, which will cause an error of 30 to 40% in the flow rate.

With the improvement of automation level, many production processes have put forward new requirements for flow measurement. The chemical reaction process is controlled by the quality (not the volume) of the raw materials.

The heating and cooling effects of steam and air flow are also proportional to the mass flow.

The strict control of product quality, accurate cost accounting, and fuel control of airplanes and missiles all require precision. Therefore, the mass flow meter is an important flow measuring instrument.

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Fluid Flow Meters Selection Guide

How to select the flowmeter？

It can be considered from five aspects. These five aspects are flow meter performance, fluid characteristics, installation conditions, environmental conditions and economic factors. The detailed factors in the five areas are as follows:

1. Instrument performance: accuracy, repeatability, linearity, range, flow range, signal output characteristics, response time, pressure loss, etc.;
2. Fluid characteristics: temperature, pressure, density, viscosity, chemical corrosion, abrasiveness, fouling, miscibility, phase change, electrical conductivity, speed of sound, thermal conductivity, specific heat capacity, isentropic index;
3. Installation conditions: pipeline layout direction, flow direction, length of the upstream and downstream side of the test piece, pipe diameter, maintenance space, power supply, grounding, auxiliary equipment (filter, getter), installation, etc.;
4. Environmental conditions: ambient temperature, humidity, electromagnetic interference, safety, explosion-proof, pipeline vibration, etc.;
5. Economic factors: instrument purchase, installation, operation, calibration, maintenance, instrument service life, spare parts, etc.

The flowmeter selection steps are as follows:

1. According to the fluid type and five consideration factors, the available instrument types are initially selected (there are several types for selection);
2. Collect data and price information for the primary selection type. Prepare conditions for in-depth analysis and comparison;
3. Use the elimination method to gradually concentrate on 1 or 2 types. It is necessary to repeatedly compare and analyze the five factors to finally determine the pre-selection target.

Related fluid flow measurement devices

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Sino-Inst offers over 50 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 meter.

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

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

Related products

What is a mass flow meter?

Air mass flow meter, namely Mass Flow Meter (abbreviated as MFM). It is an instrument for accurately measuring gas flow. The measured value is not inaccurate due to temperature or pressure fluctuations. No temperature pressure compensation is required.

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What is a mass flow controller?

The mass flow controller (abbreviated as MFC) not only has the function of the mass flow meter. More importantly, it can automatically control the gas flow. That is, users can set the flow according to their needs. MFC automatically keeps the flow constant at the set value. Even if the system pressure fluctuates or the ambient temperature changes. It will not deviate from the set value.

Simply put, the mass flow controller is a steady flow device. It is a gas steady flow device that can be set manually or connected to a computer for automatic control.

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

What does a mass air flow meter do?

Industrial Air mass flow meter is a meter used to measure the flow of industrial gas pipelines. The mass flow meter directly measures the mass flow of the medium passing through the flow meter. It can also measure the density of the medium and indirectly measure the temperature of the medium.

Since the transmitter is an intelligent instrument with a single-chip microcomputer as the core, more than a dozen parameters can be derived for users to use based on the three basic quantities mentioned above.

The mass flow meter has flexible configuration, powerful functions and high performance-price ratio. It is a new generation flow meter.

Extended Reading: Digital air flow meters

What is the principle of a mass flow controller?

The mass flow controller is composed of a flow sensor, a diverter channel, a flow regulating valve and an amplifying controller.

The flow sensor uses the principle of capillary heat transfer thermometry to measure the mass flow of gas (without temperature and pressure compensation).

The flow signal measured by the sensor heating bridge is sent to the amplifier for amplification. The amplified flow detection voltage is compared with the set voltage, and then the difference signal is amplified to control the regulating valve. The closed loop controls the flow through the channel to make it equal to the set flow.

The flow divider determines the flow of the main channel.

A regulated power supply and a digital voltmeter are provided on the flow display instrument matched with the mass flow controller. Set potentiometer, peripherals, built-in conversion and three-position valve control switch, etc.

Extended reading: How To Reduce The Effect Of Pressure On The Mass Flow Meter?

How to understand the flow unit of a mass flow meter/mass flow controller?

Gas mass flow units are generally expressed in sccm (Standard Cubic Centimeter per Minute, standard milliliters per minute) and slm (Standard Liter per Minute, standard liters per minute).

This means that under different conditions of use, the indicated flow rate is the flow rate in the standard state.

The standard state requirements are: air pressure—101325Pa (760mm Hg); temperature—0℃ (273.15K). This is an important difference between this meter and other flow meters, and it is also the difference between sccm and slm from mL/min and L/min.

For most users, the expression method of volume flow is very habitual. Easy to use. But there are also users who need to know the mass of the medium flowing in a unit of time (such as g/min). This requirement is very easy to achieve. Because the gas density in the standard state is a constant. , Can be easily found, so it can be realized by simply doing a multiplication (multiplying the density by several slm). Therefore, the volume flow rate in the standard state is equivalent to the mass flow rate.

When to use a mass flow meter and when to use a mass flow controller?

Generally speaking, when only measuring or monitoring the flow, use a mass flow meter.

When you need to control the flow, use a mass flow controller.

For some measurement occasions, both can be used. For example, when measuring the flow capacity of capillary tubes, use a mass flow meter when measuring flow at a constant pressure.

When measuring pressure with constant flow, a mass flow controller is required.

Note that when the mass flow controller is in the cleaning state. It can also be used as a mass flow meter. It’s just that the pressure drop is larger than that of ordinary mass flow meters.

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What are the main advantages of mass flow meters/mass flow controllers?

(1) Flow measurement and control are not inaccurate due to temperature or pressure fluctuations.

For most flow measurement and control systems, it is difficult to avoid system pressure fluctuations and environmental and medium temperature changes. For ordinary flow meters, fluctuations in pressure and temperature will cause larger errors. For mass flow meters/mass flow controllers, it can generally be ignored.

(2) Automation of measurement control

The mass flow meter/mass flow controller can output the flow measurement value as a standard electrical signal output.

In this way, it is easy to realize digital display of flow, automatic measurement of accumulated flow, automatic data recording, computer management, etc.

For mass flow controllers, automatic flow control can also be realized.

Generally, the analog MFC/MFM input and output signals are 0~+5V or 4~20mA, and the digital MFC/MFM is also equipped with RS232 or RS485 digital serial communication ports. It can be easily connected to a computer for automatic control.

(3) Accurately control flow

The mass flow controller can accurately control the given amount of gas. This is particularly useful for flow control in many processes, and for proportional control of different gases.

(4) Wide scope of application

• With a wide working pressure range, our products can range from vacuum to 10MPa.
• Can be applied to a variety of gas media (including some corrosive gases, such as HCL).
• There is a wide flow range. The minimum flow range of our products can reach 0～5 sccm, and the maximum flow range can reach 0～200 slm.
• The resolution of the flow display can reach 0.1% of the full scale.
• The flow control range is 2~100% of full scale (range ratio is –50:1). Therefore, it is widely used in many fields.

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• Benefits Of Digital Gas Mass Flow Meters

What are the disadvantages of mass flow meters? What are the fears of using mass flow controllers?

Relative to cheap rotameters, the main disadvantage of mass flow meters is that they are relatively expensive.

There are four fears when using a mass flow controller:

First fear of dust. If dust enters the flowmeter, it will block the sensor and the diverter, causing measurement errors. It is required to install a filter before the air inlet;

The second fear is that liquid and oil will enter the MFC. It will cause loss of control. If the outlet of the MFC is connected to a liquid tank, a check valve must be added to the outlet of the MFC to prevent the liquid from returning;

The third fear of using moist corrosive gas. Moist and corrosive gases will rust the stainless steel and cause damage to the MFC channel. Therefore, it is required to dry the gas and the MFC piping system before using the corrosive gas;

Fourth, fear not operating in accordance with safety rules when using highly corrosive, flammable, explosive, toxic, and other hazardous gases. It may cause product damage and other more serious losses. Correct use and safe operation are important to every user.

Extended reading: Stainless steel flow meters|304-316 optional

Can mass flow controllers be used to control corrosive and special gases? How to choose sealing materials?

Mass flow controllers can be used to control various gases, including corrosive gases and special gases.

But it should be noted that for the use of corrosive gas and special gas, it is necessary to select the model and sealing material appropriately.

When ordering, the user needs to make a special statement to the supplier that the gas is used. In order to avoid serious losses due to wrong selection or selection of sealing materials.

Generally, the wet materials of the gas mass flow controller that contact the working gas are 316L stainless steel, polytetrafluoroethylene, and sealing materials. Sealing materials are divided into two categories: metal seals and rubber seals.

The material of the metal seal is generally corrosion-resistant materials such as stainless steel, gold or nickel.

In principle, MFC with metal seal can be used for any gas. Including various corrosive gases and special gases.

For strong corrosive gases such as boron tribromide, boron trichloride, hydrogen fluoride, and metal oxide gases used in MOCVD, it is recommended to use metal-sealed MFC.

Due to the high price of metal-sealed MFCs, rubber-sealed MFCs are usually used where the requirements are not high.

If there is no special statement, all MFCs are sealed with fluorine rubber. It can be used for most acidic and alkaline corrosive gases. For example, it can be used for halogenated dry gases such as hydrogen chloride.

Some other special corrosive gases require special rubber.

Ammonia-Ammonia resistant rubber, such as ethylene-propylene rubber, neoprene rubber or nitrile rubber is required. Organic solvent vapor (acetone, toluene, etc.)-silicone rubber is required. Boron tribromide, boron trichloride, hydrogen fluoride, etc.-need to use perfluoro rubber.

Sino-Inst offer over 5 Air mass flow meters and controller with Best Price.

A wide variety of Air mass flow meters and controller options are available to you, such as free samples, paid samples. More about Types Of Air Flow Measurement Instruments.

Sino-Inst is Air mass flow meters and controllers suppliers, located in China. Mass Flow Meters products are most popular in North America, Mid East, and Eastern Europe.

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2 Magnetic flow meter calibration methods

At present, there are 2 solutions for Magnetic flow meter calibration: direct and indirect.

Direct Magnetic flow meter calibration is the excitation coil inspection method. This method is also known as the “dry standard” method of electromagnetic flowmeters. Indirect calibration is the external clamp-on ultrasonic flowmeter calibration method. Also known as the “non-contact measurement method”.

However, in the “dry standard” method, the standard coil is directly designed into the meter body of the flowmeter. The performance of its resistance and other indicators cannot be traced regularly.

As a result, it is impossible to determine whether the measurement characteristics of the standard coil change after a period of time. Therefore, “dry standard” is difficult to effectively realize the traceability of the value.

Compared with the “dry standard” method of detection. The external clamp ultrasonic flowmeter is capable of non-stop flow and non-cutting of pipes. The advantages of on-site Magnetic flow meter calibration are not affected by the temperature, pressure, and density of the fluid being measured.

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Magnetic flow meter calibration procedure

Clamp-on ultrasonic flowmeter calibration electromagnetic flowmeter

Calibration method: non-contact measurement method. That is, the external ultrasonic flowmeter is clamped on the pipe of the measured flowmeter. By comparing the cumulative flow error of the two flowmeters. Determine the measurement characteristics of the flowmeter being inspected.

The external ultrasonic flowmeter calibration method is used for on-site calibration. The inspector should first check whether the input of the key parameters that affect the accuracy of the measurement built in the flowmeter converter is correct.

Ask the staff about the daily flow rate, and observe and calculate the average flow rate of the flowmeter over a period of time.

Big data compared with standard equipment in the laboratory according to the standard table. Enter the pipe diameter of the standard meter and the flow meter to be inspected. Calibration coefficients, outer diameter, wall thickness and other parameters similar to the flow rate. According to the flowmeter’s online operating instructions on-site actual measurement input.

The cumulative flow method is used when calculating the indication error. Read the cumulative value of the flow of the standard meter and the meter under inspection for a certain period of time in three times. As the standard value of the measurement standard meter and the displayed value of the tested flow meter. Each measurement time is 30min.

Conditions permit or when the flow rate changes significantly within a day. Three flow points with obvious differences can be measured.

Extended reading: Industrial Magmeters

Real flow calibration electromagnetic flowmeter

How do you calibrate a magnetic flow meter?

• Select the corresponding pump according to the pipe diameter and flow rate for the verification test;
• If the system uses compressed air power. Turn on the air compressor to reach the air source pressure required by the system. To ensure the rapid switching of the commutator and the normal operation of the clamp meter;
• After the flowmeter is correctly installed and connected. It should be energized and preheated for about 30 minutes under the requirements of the verification regulations;
• If the high tank water source is used, check whether the overflow signal of the stabilized water tower appears.
• Before the formal test. According to the requirements of the verification regulations, use the verification medium to circulate the time in the pipeline system. At the same time, check whether there is any leakage in the sealing parts of the pipeline;
• Before starting the formal verification, the verification medium should be filled with the flowmeter sensor to be tested. Then turn off the downstream valve to adjust the zero position;
• When starting the verification, first open the valve at the front of the pipeline. Slowly open the valve behind the flow meter under test to adjust the flow at the verification point.
• During the calibration process, the flow stability of each flow point should be within the 1% ~ 2%-flow method, while the total amount law can be within 5%. When completing the verification process of a flow point, the temperature change of the verification medium should not exceed 1℃. When completing all the verification processes, it should not exceed 5℃. The pressure downstream of the inspected flowmeter should be high enough to ensure that no flashing and cavitation occur in the flow pipeline (especially in the reduced diameter);
• After each test, the valve at the front end of the test pipeline should be closed first. And then the pump should be stopped to avoid emptying the voltage stabilizing facility. At the same time, empty the remaining verification medium in the test pipeline. Then turn off the control system and the air compressor.

Extended Reading: Guide: Magnetic Flowmeter Installation

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Magnetic flow meter calibration frequency

The verification period for flowmeters with accuracy grades of 0.2 and better than 0.2 is 1 year. For flowmeters with accuracy grades lower than 0.2 and using quoted errors, the verification period is 2 years.

The electromagnetic flowmeter is a flowmeter that calculates the flow rate by setting a magnetic field perpendicular to the flow direction in a closed pipeline. By measuring the induced electromotive force generated by the movement of the conductive liquid in the magnetic field.
　　
The National Metrological Verification Regulations of the People’s Republic of China JJG 1033-2007 “Electromagnetic Flowmeter” 7.4 The verification period stipulates: The verification period of the flowmeter accuracy level of 0.2 and better than 0.2 is 1 year. For the accuracy level less than 0.2 The maximum verification period for the current level and usage reference error is 2 years.

Extended reading: Ultrasonic Insertion Flow Meter for Lined/Large Pipes

Do magnetic flow meters require calibration?

Mainly depends on your working conditions. If the measurement requirements are high. There are more impurities and dirt in the fluid and poor environmental conditions. Electrode fouling affects the measurement. The measurement is inaccurate after cleaning and repair. It can be verified. If the working conditions are good, the long-term use is normal. No verification is necessary.

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Sino-Inst flow calibration device and electromagnetic flowmeter production test standard

The manufacture of high-quality electromagnetic flowmeters is inseparable from high-precision flow calibration devices. The flow calibration device is the standard equipment for measurement departments and flowmeter manufacturers for value transmission, traceability and verification testing.

The Sino-Inst team has developed and built a set of high-level water towers as a voltage stabilization source. The static mass method is combined with the standard meter method, and is dedicated to the calibration device of the electromagnetic flowmeter.

The device uncertainty is better than the first-class fluid flow device level of 0.05%. It has passed the appraisal and audit of the Shaanxi Metrology Institute.

The 35-meter-high, 200-cubic-volume water tower is designed with a special overflow device. The fluctuation of the water level and liquid level during calibration measurement does not exceed 8mm. A high stability of better than 0.01% is achieved.

The production of MFE needs to go through various performance tests in a standard laboratory by an authoritative engineer before it can be put on the market.

Electromagnetic compatibility test

Electrostatic discharge (ESD) immunity GB/T 17626.2/ICE 61000-4-2
Electrical fast transient/pulse group (EFT/B) immunity GB/T 17626.4/ICE 61000-4-4
Surge (lightning strike) immunity GB/T 17626.5/ICE 61000-4-5
Power frequency magnetic field immunity GB/T 17626.8/ICE 61000-4-8

Environmental test

High and low-temperature cyclic impact test GB/T2423.1 GB/T2423.2
Salt spray test GB/T2423.17 GB/T6458
Vibration and shock test GB/T2423.10
Hazardous Substance Testing (RoHS): X-ray fluorescence spectroscopy testing IEC62321

Extended reading: Hot Water Flow Meters Improve Heating-Boiler System

Sino-Inst offer over 50 Magnetic Flow Meters, with Best Price.

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

About 13% of these are magnetic flow meter, 14% are Insertion Magnetic Flow Meter, 25% are Venturi flow meter, 13% are ultrasonic flow meter, and others are Liquid Turbine Flow Meters.

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

Leak detection method:

Use a portable ultrasonic flowmeter to test the pipeline of the entire system, which can reveal the location of the leak.

The portable flow meter allows the operator to compare the flow rate and the total flow rate at various points in the system.

The low flow at the site indicates that there is a leak nearby. This method is non-invasive and does not require cutting the pipe.

Two ultrasonic flowmeters, one is installed on the water outlet pipe of the reservoir, and the other is installed at the critical intermediate position where the pipe is spread from underground to the ground.

As long as the measurement of the two flowmeters is the same, it means that there is no water leak in the buried pipe network. On the contrary, there is water leak.

Extended reading: Industrial VS Residential inline water flow meters

When a single conduit in a complex piping configuration is compromised, it can be challenging to locate the precise point where the leak occurred. If you observe an increase in overall water consumption without making any changes, it is likely that a pipe has cracks or cracks.

Read more about: Ultrasonic clamp on flow meter Pros and Cons

Related ultrasonic water flow meters

Read more about: Digital Water Flow Meters

How does an ultrasonic flow meter work?

Transit time Ultrasonic Flow Meter adopts the measurement principle of 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

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Extended reading: Ultrasonic Insertion Flow Meter for Lined/Large Pipes

Sino-Inst, Manufacturer for Ultrasonic Water Flow Meters. It can measure even liquids such as water, seawater, oil, and slurry.

Sino-Inst’s Ultrasonic Water 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.

Features of 3″ Water Meter

Extended Reading: Clamp on Water Flow Meter

3″ water meter flow rate

Caliber(mm)	Inch	Measurement grade Q3/Q1   m³/h	Overload flow Q4 m³/h	Common flow Q3 m³/h	Boundary flow Q2 m³/h	Minimum flow Q1 m³/h	Minimum reading m³	Maximum reading
50	2	50	31.25	25	0.8	0.5	0.001	999999
65	2½	50	50	40	1.28	0.8	0.001	999999
80	3	50	78.75	63	2.016	1.26	0.001	999999
100	4	50	125	100	3.2	2	0.001	999999
125	–	50	200	160	5.12	3.2	0.001	999999
150	6	50	312.5	250	8	5	0.01	9999999
200	8	50	500	400	12.8	8	0.01	9999999
250	10	50	787.5	630	20.16	12.6	0.01	99999999
300	12	50	1250	1000	32	20	0.1	99999999
350	14	50	1750	1400	56	35	0.1	99999999
400	16	50	2000	1600	51.2	32	0.1	99999999
500	20	50	3125	2500	80	50	0.1	99999999
600	24	50	6000	3000	600	90	0.1	99999999

3″ water meter dimensions

Read more about: Flow Meter Selection Guide

3″ Water Meter Pressure Loss

The specifications of 3″ Water Meter are as follows:

Executive standard	CJ/T224-2006
Measurement accuracy level	Class B
Temperature class	T30, T50, T70, T90
Pressure Level	MAP10
Pressure loss level	△P63
Maximum allowable error	a) Low area (Q1≤Q&lt;Q2) The maximum allowable error is ±5% a) When the water temperature is ≤30℃, the high zone (Q₂Q<Q) is the largest Allowable error is ±2% Q1 Q2 When the water temperature is ≥30℃, the high zone (Q₂QQ) is the largest Allowable error is ±3% Q2 Q4
Electronic technical indicators	Bus power supply: external supply DC6.5V~18V Working current: -5uA Communication interface: RS-485 interface; MBUS interface External power supply: 5~10V
technical standard	The technical parameters of this product conform to national standards GB/T778.1~3-2007 (ISO464-1~3:2005IDT) regulations The electronic device complies with Electronic Remote Water Meter”

The pressure loss level of the water meter is △p63, which represents the maximum pressure loss of 0.063MPa

Read more about Everything You Need To Know About Electronic Flow Meters

3″ water meter with pulse output

The pulse output water meter is a water meter with a very unique design.

It has the characteristics of passive signaling. A square wave signal can be output without a power supply. The distance reached one kilometer. And the transmitted signal is very accurate.

The water meter has a self-retaining function. Avoid more possibility of false signal. It can ensure that the signal has no errors.

Prevent all kinds of water theft from happening.

The service life is also very long, and the service life of the remote transmission part can be as long as ten years.

The water meter supplied by Sino-Inst can be configured with pulse output. When you place an order, please confirm with our sales engineer.

Extended reading: 2 inch Water Flow Meter

Water meter types

In addition to the water meter described at the top of this article. We also have many types of water meters. Such as turbine water meter. Ultrasonic water meter. Electromagnetic water meter, etc.

In addition to the water meter described at the top of this article. We also have many types of water meters. Such as turbine water meter. Ultrasonic water meter. Electromagnetic water meter, etc.

Extended reading: Advantages and disadvantages of ultrasonic water meters

The types of water meters can be divided by the principle of measurement, the common types are: 　　

a) Mechanical water meter:
Measuring sensors, calculators and indicating devices are all water meters with mechanical principles and structures. There are mainly speed water meters and volumetric water meters.　　

b) Mechanical water meter with electronic device:
The mechanical water meter with complete structure is retained, and the water meter with an electronic device is installed on this basis, mainly including IC card water meter and remote water meter.
The measuring sensor of the mechanical sensor electronic water meter is composed of a sensor based on the principle of mechanical motion and a sensor element that can convert the mechanical motion into an electrical signal and input into the calculator. Both the calculator and the indicating device are electronic components, such as a vortex (impeller) wheel electronic water meter.　　

Read more about: How does a residential water meter work?

c) Electronic water meter:
Electronic water meters are divided into mechanical sensor electronic water meters and electronic sensor electronic water meters.
The measuring sensor of the electronic water meter is based on the principle of electronic or electromagnetic induction. Both the calculator and the indicating device are electronic components.
Such as ultrasonic water meter, jet water meter, Coriolis water meter, and electromagnetic water meter.

Extended Reading: Chilled Water Flow Meter

More Water Flow Meters

FAQ

More Water Flow Measurement Solutions

Sino-Inst offers over 30 water meter products. About 50% of these are ulrtasonic flow meters. 40% are mechanical water meters.

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

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

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

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

Featured analog flowmeters

Analog water flow meter

Analog air flow meter

Analog gas flow meter

Analog diesel flow meter

Read more about: Industrial flow meters for Different industrial applications

FAQ

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Sino-Inst offers over 50 Industrial analog flow meters for flow measurement. About 50% of these are gas flow meters, 40% are the liquid flow sensor, and 20% are the Ultrasonic and mass flow meter.

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

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

2 inch Water Flow Meter types

2 inch magnetic flow meter

Magnetic Water Flow Meter is an electromagnetic flowmeter used to measure conductive fluids. Conductive liquids such as drinking water, sewage, wastewater, seawater, ammonia, cement slurry, etc.

Caliber	2 inch (DN50)
Excitation method	Square wave constant current excitation
Installation form	One-piece flange, split flange
lining	Neoprene, polyurethane rubber, PTFE, F46
Electrode material	316L, Hc, Hb, titanium, tantalum, platinum iridium, tungsten carbide
Ground	Built-in ground electrode (DN25 and above)
Medium	Conductive liquid
level of accuracy	0.5, 1.0
Dielectric conductivity	＞ 5 μS/cm
Flow rate	≤ 10 m/s
Flow range	0.71~2.12~35.35~70.68 m³/h
Pipe connection flange	GB 81～59
Pipe connection	Flange connection; Tri-clamp
Medium temperature	Chloroprene rubber: -10℃～60℃; PTFE: -10℃～120℃ Polyurethane rubber: -10℃～80℃; F46: -10℃～150℃
preset pressure	4.0 MPa; 1.6 MPa; 1.0 MPa
Protection level	IP65; IP68
output signal	4mA ～ 20mA DC current; pulse/frequency; upper and lower limit alarm
Cable interface	M20×1.5 internal thread
Communication	RS 485 communication protocol (Modbus protocol) RS 232 communication protocol (optional)
Display	Instantaneous flow, alarm display, percentage, flow rate, forward and reverse cumulative flow and total cumulative
power supply	220V AC, 24V DC, 3.6 V battery power supply
Use type	Ordinary type, waterproof type
High pressure	custom made

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2-inch ultrasonic flow meter

The ultrasonic flowmeter measures water and can be used as an industrial pipeline type. External clamp installation.

The clamp-on ultrasonic flowmeter is the most popular. Because the installation is simple.

Item	Performance and Parameter
Convertor	Principle	transit-time ultrasonic flowmeter
	Accuracy	Flow: over 1%-2%(battery-powered supply over ±2% )，Heat: over ±2%，Repeatability: over 0.2%
	Display	2×20 character LCD with backlight, support the language of Chinese, English and Italy Convertor dimension:170*180*56cm
	Operation	Support 16 key light touch keyboard and the Simulation keyboard software
	Signal Output	1 way 4~ 20mA output, electric resistance 0~ 1K，accuracy0. 1%
		1 way OCT pulse output ( Pulse width 6 ~ 1 0 0 0 ms，default is 2 0 0 ms)
		1 way Relay output
	Signal Input	3 way 4~ 20mA input, accuracy 0. 1%，acquisition signal such as temperature, press and liquid level
		Connect the temperature transducer Pt100, can finish the heat/energy measurement
	Data interface	Insulate RS485 serial interface, upgrade the flow meter software by computer, support the MODBUS, METER-BUS etc.
	Other Function	Automatically remember the previous flow/energy data of 512 days,  128 months and 10 years
		Automatically remember the previous flow/energy data of 512 days working condition and check it
		Automatically remember the previous 32 times power on/off time and flow rate
Special Cable	Twisted-pair cable, generally, the length under 50 meters; Select the RS485 communication. The transmission distance can over 1000m.
Pipe Installation Condition	Pipe Material	Steel, Stainless steel, Cast iron, Copper, Cement pipe, PVC, Aluminum, Glass steel product, liner is allowed.
	Pipe Diameter	32mm—6000mm
	Straight length pipe	Transducer installation should be satisfied: upstream10D, downstream 5D, 30D from the pump.
Measuring Medium	Type of Liquid	Water (hot water, chilled water, city water, sea water, waste water, etc.);  Sewage with small particle content; Oil (crude oil, lubricating oil, diesel oil, fuel oil, etc.);  Chemicals (alcohol, acids, etc.); Plant effluent; Beverage, liquid food;  Ultra-pure liquids; Solvents and other liquids More about: Sewage Flow Meter Selection
	Temperature	Standard Transducer: -30–90℃; High-temperature transducer: -40–160℃
	Turbidity	No more than 10000ppm and less bubble
	Flow rate	0–±12 m/s
Working Environment	Temperature	Main Unit: -20–60℃
		Flow transducer: -40–160℃;
		Temperature transducer: according to the customer’s demands.
	Humidity	Main Unit: 85% RH; Flow Transducer: Ip67
Power Supply	DC  24V or AC  85-264V
Power Consumption	1.5W

2-inch ultrasonic flow meter, if configured according to the lowest cost. Price is USD 340.00/set

Extended reading: Advantages and disadvantages of ultrasonic water meters

2-inch mechanical water flow meter

Uses:

It is used to measure the consumption of drinking water flowing through a water pipe in a household or a residential unit.

Features:

• Simple structure
• Convenient manufacturing and maintenance, low cost
• Durable, low water quality requirements
• Errors are easy to adjust
• Relatively large flow ratio
• Better sensitivity
• Lower requirements for straight pipes

Conditions of Use:

• Water pressure is not more than 1MPa
• The water temperature of the cold water meter does not exceed 30℃
• The water temperature of the hot water meter does not exceed 90℃

Extended reading: Hot Water Flow Meters Improve Heating-Boiler System

2-inch mechanical water flow meter, bulk purchase, the cost can be reduced to USD 15.00/pc

Of course, in addition to the three 2inch water flow meters introduced here. There are other types of flow meters that can also be used to measure the water flow rate.

Extended reading: Featured Cheap flow meters for Sale

2 Inch Digital Flow Meter

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

Read more about Digital Water Flow Meters.

2 Inch Chemical Flow Meter

A chemical flow meter is a flowmeter used to measure common chemical fluid media. In chemical production control and metering, between chemical reaction storage tanks. As an important monitoring instrument, the flow meter is also used as an instrument for internal cost accounting and foreign trade measurement.

You may often hear about ultrasonic flow meters, electromagnetic flow meters, turbine flow meters, volumetric flow, or mass flow. Chemical flow meters are common in industries like petrochemical plants and refineries. Sino-Inst offers a wide range of liquid and gas flow meters to help you regulate the flow of water, petroleum products, fuels, chemicals, and more.

Read more about Chemical flow meters types.

Extended reading: Industrial VS Residential inline water flow meters

You can refer to the following:

FAQ

2 inch Water Flow Meter supplied by Sino-Inst, customer feedback:

Read more about: What is an inline flow meter?

Sino-Inst offers over 20 2 inch Water Flow Meters, with the Best Price.

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

About 13% of these are magnetic flow meters, 14% are Insertion Magnetic Flow Meter, 25% are ultrasonic flow meters, 13% are Handheld ultrasonic flow meters, and others are Liquid Turbine Flow Meters.

Sino-Inst is a Water Flow Meters supplier, located in China.

Wastewater flow meter products are most popular in North America, Mid East, and Eastern Europe.

The United States, and India, which export 99%, 1%, and 1% of ultrasonic level transmitters respectively.

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

What Is Digital Air Flow Meters?

The digital air flow meter is also a digital gas flow meter. The digital air flow meter can measure and display parameters such as mass flow, volume flow, gas temperature, atmospheric pressure and gas pressure of air or other gases. Such as argon, hydrogen, nitrogen, etc.

A digital air flow meter is different from a mechanical gas flow meter. The first is because of the local digital display. For example, a vortex flowmeter, or a handheld gas mass flowmeter. The parameters of the gas pipeline can be displayed locally. The second is because of the signal output. Mechanical gas flow meters cannot support signal output. But digital air flow meter generally supports signal output. Convenient for monitoring system or control system management. Such as 4-20mA, RS485 and so on.

First, We recommend a small digital airflow meter for you. Also called a portable gas mass flow meter. MF5700 series.

MF5700 series portable gas mass flow meter is a digital air flow meter developed based on MEMS flow sensor chip.

It is a measuring instrument with a wide application range. Low power consumption, portable, with the display. And capable of realizing networked.

Gas medium: air; nitrogen; oxygen; chlorine; carbon dioxide; contact the manufacturer for other gases.

Suitable for the monitoring and measurement of clinical oxygen supply in hospitals and various industrial applications.

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

Performance parameter	MF5706	MF5712	Unit
Range	0~10,25	0~200	L/min
Precision	+(2+0.5FS)	+(2.5+0.5FS)	%
Repeatability	0.5		%
Response time	≤2		sec
Power supply	4 AA batteries or external adapter power supply
Power consumption	≤10		mW
Output	FS485 (Optional)
Display	LCD
Display unit	Instantaneous flow SLPM (L/min), cumulative flow NCM (M3)
display resolution	0.01	0.1	L/min
keyboard	Three button
Function description	Password setting. Set the total amount and clear it. Alarm function
Work pressure	≤0.8		mpa
Operating temperature	-10~+55		℃
Pressure loss	≤600	≤2000	pa
Working time period (battery)	＞60		days
Standard calibration gas	Nitrogen
Lead wire	Dedicated minUSB connection communication cable (optional)
Caliber	6mm	12mm
Mechanical interface	NPT-1/4	NPT-1/2
Weight	About 300		g

Extended reading: What is Modbus Protocol?

Model	Cliber	Mechanical interface	FLow Range: SLPM	FLow Range: NCMH
MF5706	6mm	1/4″	10 25	0.6 1.5
MF5712	12mm	1/2″	200	12

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Read more about Rotameter flow meter-Variable Area Flow Meters. Suitable for liquid and gas volumetric flow measurement and control.

Air Flow Meter Types

Sino-Inst provides industrial air flow meters. The main types of air flow meters are:

1. Thermal mass flow meter
2. Vortex flowmeter
3. Precession vortex flowmeter
4. Annubar flowmeter
5. Metal Rotameter
6. Gas turbine flowmeter
7. Micro gas mass flow meter

All of the above gas flow meters can be used to measure air flow. And the measurement of common industrial gas flow. Such as oxygen, hydrogen, nitrogen, argon, etc. Based on different measurement parameters such as pressure, temperature, pipe size, flow range, etc. We will choose the right flowmeter for you.

Extended reading: What is an air pressure transducer?

More Featured Digital air flow meters

Digital Flow Meters

Digital flow meters measure and display the flow rate of industrial liquid and gas. Like water, oil, natural gas, oxygen, diesel fuel, and more. And all pipe sizes are available, for 1/2″, 2inch, to 8 inches.

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.

Read more about Digital Flow Meters

Digital Water Flow Meters

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Sino-Instrument offers over 50 Digital air flow meters for air/compressed air flow measurement.

About 50% of these are vortex flow meters, 40% are the thermal mass flow sensor, and 20% are turbine and DP flow meters.

A wide variety of Digital air flow meters options are available to you, such as free samples, paid samples. Read more about: Importance Of Air Flow Measurement

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