Professional Partner for Measure &amp; Control

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

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

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

Flow Totalizer Meter vs Flow Meter

Posted on November 8, 2021 by KimGuo11

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.

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?

**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 .

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

Frequently
Asked
Questions

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:

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.
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

Technical Support More Flowmeters

Explore Oil and Gas Flow Meters

Posted on November 1, 2021 by KimGuo11

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.

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.

**Low temperature Turbine Flowmeter-Liquid Nitrogen 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

Extended reading: Ultrasonic flow detectors types

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.

Recent Oil & Gas Blog Posts

Gas Rotameter Tips

What is Gas Rotameter? Rotameter is also called float flowmeter. It is often called glass tube float flowmeter,…

Differential Pressure Flow Meter Calculation Formula and Calculation Examples

Differential pressure flow meters can measure all single-phase fluids. It can measure liquid, gas, and steam. Such as…

Bidirectional Flow Measurement

What is bidirectional flow? Bidirectional flow refers to forward and directional flow. Bi-directional flow lines are not common…

Grease Flow Meters

What is a Grease Flow Meter? Grease Flow meters are meters dedicated to measuring the volume or mass…

Industrial Oil Flow Meters

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

Mechanical Flow Meters

Selection Guide What is a mechanical flow meter? Mechanical flow meters are a type of flow meters that…

Air mass flow meter VS Controller

Air mass flow meter (abbreviated as MFM) is used for precise measurement of gas mass flow.A gas mass…

Industrial Petrol Flow Meters | Selection Guide

Petrol flow meters are often used for inline monitoring of gasoline flow rates. Positive displacement & Turbine flow…

Biogas Flow Meters Selection Guide

Biogas Flow Meters are instruments that can measure the flow of biogas. Could be a vortex flow meter,…

LPG flow meters

LPG flow meter is used for flow measurement of liquefied petroleum gas. The flow measurement of LPG is…

Industrial LPG/Propane flow meter

Featured Inline Propane Flow Meter Propane is also generally referred to as liquefied petroleum gas (LPG). So what…

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

Standard Platinum Rhodium Thermocouple

Posted on October 22, 2021 by KimGuo11

Standard Platinum Rhodium Thermocouple-Platinum Thermocouple

Standard Platinum Rhodium Thermocouple is a temperature measurement standard device produced by our company. There are two types of standard platinum-rhodium 10-platinum thermocouple and standard platinum-rhodium 30-platinum rhodium 6 thermocouple.

Technical Support

First-class standard thermocouple WRPB-1

Second-class standard platinum rhodium 30-platinum rhodium 6 thermocouple

Second-class standard thermocouple WRPB-2

The standard platinum rhodium 10-platinum thermocouple is used to realize the thermocouple temperature measurement value transfer and precise temperature measurement in the temperature range of 419.527~1084.62 ℃. The accuracy grades are first-class and second-class standards.

The standard platinum rhodium 30-platinum rhodium 6 thermocouple is used for the value transfer and precision temperature measurement of the current thermocouple in the temperature range of 1100~1500℃. The accuracy grade has the second-class standard.

The first-class standard thermocouple is also called the first-class standard platinum rhodium 10-platinum thermocouple. The first-class standard thermocouple is used to verify the second-class standard thermocouple. The first-class standard platinum-rhodium 10-platinum thermocouple verifies the second-class standard platinum-rhodium 10-platinum thermocouple.

The first-class standard thermocouple WRPB-1 is one of the world’s first-class temperature measurement standard devices.

Standard thermocouples are divided into first-class standard thermocouples and second-class standard thermocouples.

The standard thermocouple is of higher precision in the thermocouple series and has good physical and chemical properties. Good oxidation resistance at high temperatures. Thermocouple with good stability and reproducibility of term electromotive force.

Model: WRPB-1
First-class standard thermocouple length: L=Φ0.5×1000mm
The temperature range of the first-class standard thermocouple: 300-1300℃
First-class standard thermocouple indexing number: S type (platinum rhodium 10-platinum)
First-class standard thermocouple electric potential value requirements:
The measuring end of the standard thermocouple (WRPB-1) is at the copper point (1084.62℃) or the antimony point (630.63℃) and the zinc point (419.527℃).
When the reference junction temperature is 0℃, its thermoelectric potential should meet the following requirements:
E(tCu)=10.575±0.015mv
E(tAl)=5.860+0.37[E(tCu)-10.575]±0.005mV
E(tAsb)=5.553+0.37[E(tCu)-10.575] ±0.005mV
E(tZn)=3.447+0.18[E(tCu)-10.575] ±0.005 mV
The stability of the first-class standard platinum-rhodium 10-platinum thermocouple is determined by the difference between the two thermoelectric potentials and does not exceed 3uV. The annual variation of the thermoelectric potential of the copper point of WRPB-1 does not exceed 5uV.

The first-class standard platinum-rhodium 10-platinum thermocouple has a platinum-rhodium wire for the anode and a platinum wire for the anode. A double-hole insulated porcelain tube with a length of 550 mm is sheathed on it.
Refer to the positive terminal to cover the red or pink plastic tube; the negative terminal to cover the white or blue plastic tube.
The whole product is stored in an ordinary glass outer tube.

How to use first-class standard thermocouple

Before using WRPB-1, check whether the thermocouple number is consistent with the product number on the verification certificate.

When in use, take the standard couple out of the glass outer protective tube and put it into the quartz outer protective tube to measure. After use, put it back into the glass outer protective tube for storage.

When using the standard coupler WRPB-1 to verify the standard coupler WRPB-2. The reference terminal of the standard coupler and the thermocouple under test should be at 0℃. The specific method steps are carried out in accordance with the “Standard Platinum Rhodium 10-Platinum Thermocouple Verification Regulations” (JJG75-1995) approved and issued by the National Quality and Technical Supervision Bureau.

When a standard couple is used for precise temperature measurement, the temperature t is determined by the following formula: (omitted here). When measuring the temperature, you should first prepare the corresponding E(t)-t comparison table according to the approximate temperature range of the thermocouple. Then according to the thermoelectric potential value measured by the thermocouple, the temperature t can be obtained according to the comparison table compiled above. The temperature interval of the comparison table is set by the user. If the accuracy requirement is not too high, a comparison table of the entire Baidu interval can be compiled.

Precautions for the use of first-class standard thermocouples

When using and storing, the porcelain tube and plastic tube on the standard thermocouple shall not be arbitrarily removed. Try to keep the standard flat and straight. The WRPB-1 thermocouple shall not be severely bent. Quartz outer protective tube should be added. During transportation and storage , The standard thermocouple WRPB-1 should be avoided from being subjected to severe mechanical shock.
According to “Standard Platinum Rhodium 10-Platinum Thermocouple Verification Regulations” (JJG75-1995), regular supervisory inspection and periodic verification shall be carried out.
Please keep the verification certificate attached to the Sino-Inst product when it leaves the factory. You must bring the original verification certificate with you during the next verification.

Due to the frequent changes in precious metal prices recently, our company’s production costs have changed accordingly. For the price of WRPB-1 first-class standard thermocouples, please contact Sino-Inst sales engineers directly.

Second-Class Standard Thermocouple WRPB-2

Introduction
Specifications
Structure
How to use
Price

Second-class standard thermocouples are used for thermocouples and precision temperature measurement in the temperature range of 300-1300℃. The second-class standard thermocouple needs to be verified with the first-class standard thermocouple of the next higher grade.

The second-class standard thermocouple is the standard instrument for verifying industrial thermocouples. Sino-Inst is the leading manufacturer of domestic standard thermocouples. For 20 years, it has provided high-quality, high-stability second-class standard platinum-rhodium 10-platinum thermocouples to various industries . The second-class standard thermocouple model of our factory is WRPB-2, which has a good reputation for quality. Buying second-class standard thermocouples from standard thermocouple manufacturers will get technical support and products with lower prices.

Second-class standard thermocouple model: WRPB-2
The temperature measurement range of the second-class standard thermocouple: 300-1300℃
The length of the second-class standard thermocouple: L=1000mm (the diameter of the coupler wire is Φ0.5mm)
Indexing number: S type (platinum rhodium 10-platinum)
Second-class standard thermocouple electric potential value requirements:
- A. The second-class standard thermocouple (the second-class standard platinum rhodium 10-platinum thermocouple) is at the copper point (1084.62℃), aluminum point (660.323℃) or antimony point (630.63℃) and zinc point (419.527℃). When the reference junction temperature is 0℃, its thermoelectric potential should meet the following requirements:
  E(tCu)=(10.575±0.015)mv
  E(tAl)=5.860+0.37[E(tCu)-10.575]±0.005mV
  E(tAsb)=5.553+0.37[E(tCu)-10.575] ±0.005mV
  E(tZn)=3.447+0.18[E(tCu)-10.575] ±0.005 mV
- B. The stability of the second-class standard thermocouple is determined by the change of the electromotive force of its copper point (the difference between the two thermoelectric potentials). The newly manufactured second-class standard thermocouple does not exceed 5μV, and the second-class standard thermocouple in use is of The annual change does not exceed 10μV.
- C. For the frequently used second-class standard thermocouple (second-class standard platinum rhodium 10-platinum thermocouple), in order to ensure the accuracy and reliability of the value, the necessary supervisory verification should be carried out according to the use situation. The second-class standard thermocouple supervisory verification is based on the first-class standard thermocouple (first-class standard platinum rhodium 10-platinum thermocouple) or the infrequently used second-class standard thermocouple as the standard device, and its qualification is determined by the copper point. The difference between the measured thermoelectric potential and the thermoelectric potential given by the metrological verification certificate is determined (the difference is not more than 7μV).
- D. The standard thermocouple certified by the third-party metrological verification agency authorized by the General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China in compliance with “JJG75-1995 “Standard Platinum Rhodium 10-Platinum Thermocouple” National Metrological Verification Regulations” will be issued a verification certificate. The effective digits of the second-class standard thermocouple thermoelectromotive force value given in the metrological verification certificate are 3 digits after the decimal point (see the following certificate data for details).
- E. The verification period of the second-class standard hot platinum rhodium 10-platinum galvanic couple is one year. The product needs to be sent to a legal metrological verification agency for verification before the expiration of the metrological verification certificate to avoid delay in use.

The second-class standard thermocouple (second-class standard platinum-rhodium 10-platinum thermocouple) positive electrode is platinum rhodium 10 wire. The negative electrode is platinum wire. It is sheathed with a double-hole insulated porcelain tube with a length of 550 mm.
Reference end positive sleeve red or pink plastic tube. Negative sleeve white or blue plastic tube.
The whole product is stored in a glass outer tube.

How to use the second-class standard thermocouple

Before use, check whether the second-class standard couple number is consistent with the product number on the verification certificate. The product and the measurement verification certificate are one-to-one correspondence. The product number is inconsistent with the thermocouple number on the certificate. It means that the certificate is not the thermocouple Even the certificate of metrological verification.
When the product leaves the factory, there is a quartz tube (approximately 550mm long) and a common glass tube in the container. When using, take the second-class standard couple out of the glass tube and put it into the quartz outer protective tube for measurement. After use, put the second-class standard hot platinum rhodium 10-platinum galvanic couple back into the glass outer protective tube for storage.
When using the second-class standard thermocouple WRPB-2 to verify the working thermocouple. The reference end of the second-class standard couple and the thermocouple under test should be at 0°C. The specific methods and steps are carried out in accordance with the verification regulations of “JJG75-95 Standard Platinum Rhodium 10-Platinum Thermocouple” approved and issued by the Quality and Technical Supervision Bureau.
When the second-class standard couple is used for precise temperature measurement, the temperature t is calculated according to the “standard thermocouple thermoelectromotive force-temperature conversion method” in the metrological verification regulations. When measuring the temperature, the second-class thermocouple should be roughly used according to the temperature range . Compile the corresponding E(t)-t comparison table. Then according to the thermoelectric potential value measured by the thermocouple, the temperature t can be obtained according to the comparison table prepared above. The temperature interval of the comparison table is set by the user. If the accuracy requirement is low, a comparison table of the entire Baidu interval can be compiled.

Precautions for the use of second-class standard thermocouples

When using and storing the second-class standard thermocouple (the second-class standard platinum rhodium 10-platinum thermocouple). The porcelain tube and plastic tube on the second-class standard thermocouple shall not be arbitrarily removed. Try to keep the standard straight. Do not use The thermocouple is severely bent. Quartz outer protective tube should be added. During transportation and storage, avoid the standard second-class standard platinum rhodium 10-platinum thermocouple WRPB-2 from being subjected to severe mechanical shock.
According to the verification regulations of “JJG75-95 Standard Platinum Rhodium 10-Platinum Thermocouple”, the second-class thermocouple shall be regularly inspected and periodically verified.
Please keep the verification certificate attached to the second-class standard thermocouple when leaving the factory. The user must bring the original verification certificate for the next verification. If there is no certificate, it will not be used as a second-class standard thermocouple.

At present, the price of precious metals changes frequently. Sino-Inst produces standard thermocouples using precious metal wires. The cost varies with market prices. For the price of WRPB-2 second-class standard couples, please contact our sales engineers directly.

Second-Class Standard Platinum Rhodium 30-Platinum Rhodium 6 Thermocouple

Introduction
Specifications
Order

The second-class standard platinum rhodium 30-platinum rhodium 6 thermocouple is a standard instrument for temperature value transfer in the temperature range of 1100-1500℃. It is usually used to verify industrial platinum and rhodium thermocouples. It is also used for the measurement range of 1100-1500℃. Precision measurement.

The first-class standard platinum rhodium 30-platinum rhodium 6 thermocouple and the second-class standard platinum rhodium 30-platinum rhodium 6 thermocouple are produced with high-purity standard thermocouple wire. Its positive electrode (BP) is platinum containing 30% rhodium Rhodium alloy. The negative electrode (BN) is a platinum-rhodium alloy containing 6% rhodium.
The wire diameter of the standard platinum rhodium 30-platinum rhodium 6 thermocouple (referred to as the standard double platinum rhodium thermocouple) is 0.5mm and the length is 1000mm.
When the second-class standard platinum rhodium 30-platinum rhodium 6 thermocouple temperature at the measuring end is 1100°C and 1500°C, and the reference end temperature is 0°C, its thermoelectromotive force should be:
E(1100)=(5.780±0.025)mV
E(1500)=(10.099±0.040)mV
The stability of the standard double platinum and rhodium thermocouple. Platinum and rhodium are determined by its thermoelectromotive force change at 1500℃: the first-class standard platinum-rhodium 30-platinum rhodium 6 thermocouple is not greater than 6μV. The second-class standard platinum rhodium 30-platinum The rhodium 6 thermocouple is not more than 8μV.
The measuring end of the standard double platinum and rhodium thermocouple is sleeved with a double-hole 550mm high-purity alumina tube. The reference end is a pink plastic tube for the positive electrode and a white plastic tube for the negative electrode.
The second-class standard platinum rhodium 30-platinum rhodium 6 thermocouple has no protective tube when it leaves the factory. When not in use, it is placed horizontally in a clean glass tube in a special container. It is stored under stress-free conditions.

Reference end positive sleeve red or pink plastic tube. Negative sleeve At present, the price of precious metals changes frequently. Sino-Inst produces standard thermocouples using precious metal wires. The cost varies with market prices. For the price of WRPB-2 second-class standard couples, please contact our sales engineers directly.

Frequently
Asked
Questions

Platinum and its alloys will withstand more adverse conditions than base metal thermocouples. But they still have their limitations. The melting point of platinum is 1769°C, and the melting point of the highest melting point of rhodium alloy used for thermocouple applications is about 1890°C.

Platinum is not equal to a thermocouple. Platinum is a material that can be used to make thermocouples.

In theory, any two different conductors (or semiconductors) can be made into thermocouples. But as a practical temperature measuring element, there are many requirements for it. In order to ensure the reliability in engineering technology and sufficient measurement accuracy. Not all materials can make up a thermocouple. Generally, the basic requirements for the electrode materials of thermocouples are:

In the temperature measurement range, the thermoelectric properties are stable, do not change with time, have sufficient physical and chemical stability, and are not easy to be oxidized or corroded;
The temperature coefficient of resistance is small, the conductivity is high, and the specific heat is small;
The thermoelectric potential generated in temperature measurement should be large, and the relationship between thermoelectric potential and temperature is linear or close to linear single value function;
The material has good reproducibility, high mechanical strength, simple manufacturing process and low price.

Platinum rhodium thermocouple is also called a high-temperature precious metal thermocouple. Platinum rhodium has single platinum rhodium (platinum rhodium 10-platinum rhodium) and double platinum rhodium (platinum rhodium 30-platinum rhodium 6). As temperature measurement sensors, they are usually used in conjunction with temperature transmitters, regulators, and display instruments. A process control system is formed to directly measure or control the temperature of fluids, steam and gaseous media, and solid surfaces in the range of 0-1700°C during various production processes.

Extended reading: RTD vs. Thermocouple: What’s the Difference, and Which Should You Use?

Related Blogs

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

4-20mA to 0-10v voltage, this is I/V conversion. That is current-voltage conversion, usually used for long-distance signal transmission…

Type k thermocouple chart

A thermocouple chart is a practical tool for the electronic query of temperature index. It is used by…

RTD vs Thermocouple

RTD vs Thermocouple- What is the difference? What are they used for? Both RTDs and thermocouples are sensors…

Temperature Sensor Transmitter—-Do You Know?

Temperature sensor transmitter is a combination of temperature sensor and temperature transmitter. It can be used in chemistry…

Sino-Inst, Manufacuturer for Temperature Transmitters, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.

Sino-Inst’s Temperature Transmitters, made in China, Having good Quality, With better price. Our Temperature 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

Technical Support Level Sensors

Tank Level Gauges & Indicators

Posted on October 19, 2021 by KimGuo11

Tank level gauges are instruments used to indicate and control the height of the liquid level in the tank. Commonly used in water storage tanks, oil storage tanks, and underground tanks. Tank level gauges are also often called Tank level Indicators or liquid level sensors. They are mainly for the level of liquid in the tank. There are many types of Tank level gauges supplied by Sino-Inst. Including floating ball, magnetic, radar, ultrasonic, and hydrostatic pressure, etc.

You may have heard a lot of sayings, tank level gauges, tank level sensors, and tank level transmitters. Next, we will briefly introduce them.

The tank level gauge is a kind of level meter used to measure the low and high levels of the liquid level. The position of the measured liquid medium in the container (including tanks, storage tanks, and spherical tanks). Liquid level. The meter that measures the liquid level has been changed from a “liquid level gauge” to a “level gauge”. Level gauges include tuning fork level gauges, float level gauges, magnetic flap level gauges, drip level gauges, radar level gauges, and so on.

Extended reading: Industrial Tank level indicators and Tank Level Gauges

Tank level sensor is a common sensor for measuring liquid level position. It converts the height of the position into an electrical signal for output. The liquid level sensor is a modular circuit. It has the advantages of acid resistance, moisture resistance, shock resistance, and corrosion resistance. The circuit contains a constant current feedback circuit and an internal protection circuit. The maximum output current can be made to not exceed 28mA. Therefore, the power supply can be reliably protected and the secondary meter is not damaged. In general, it is used in electrical appliances and equipment that require water level control.

Extended reading: Ultrasonic liquid level sensors

The liquid level transmitter has a further function than the liquid level gauge and the liquid level sensor. For example, when the float moves up and down with the liquid level. An electrical signal will be generated in a metal tube. However, this electrical signal is often irregular in size and cannot even be used for future circuits. For this reason, a circuit was installed near the pipe. The purpose is to convert this non-standard electrical signal into a standard electrical signal (such as 4-20MA, 0-10V, etc.). It can be output to other instruments or devices for display or control. This device is called a “level transmitter”.

Extended reading: GWR Corrosive Liquid Chemical Level Sensor

Although, tank level gauge, tank level sensor, and tank level transmitter are essentially different. But people are used to mixing these terms. Therefore, our tank level gauges below also include level sensors and transmitters.

Featured Tank Level Gauges

**LR series Integral flange Magnetostrictive level sensor**

**LT series Digital Display Magnetostrictive liquid level sensor**

**SI-U02 Multi-Point Liquid Level Float Switch**

**ULT-100A Ultrasonic Level Transducer**

**Portable Ultrasonic Liquid Level Indicator**

**HS-2000 Ultrasonic Tank Level Sensor-External Mounted**

**SIRD-701 Guided Wave Radar Level Sensor**

**Differential pressure(DP) level transmitter**

Tank Level Gauges Types

No.	Gauge type	Main features	Disadvantage	Installation method	Price
1	Ultrasonic level gauge	No direct contact with the medium, only the gas phase part. Read more about: Ultrasonic Tank Level Sensors for Tank Level Monitoring	The accuracy is relatively low. It is not possible to measure pressure vessels. Cannot measure volatile media.	Top installation, the device needs to be cut	Medium
2	Radio Frequency Admittance Level Gauge	Measurable interface	It is not easy to calibrate. The measuring medium must not be vicious. Otherwise, the probe hanging material will affect the measurement accuracy	Hole on the top of the device	Medium
3	Magnetic flap level gauge	Intuitive and easy to install	The magnetic ball gets stuck easily. Make it impossible to transmit instructions remotely	To connect to the device, need to open a hole	Low
4	Differential pressure level gauge	Wide range of popularization, easy to calibrate	It is closely related to the change of medium density. When measuring corrosive media, the material requirements of the instrument diaphragm are very high.	The device needs to be opened	Lower middle class
5	γ-ray level gauge	Non-contact measurement with medium, high accuracy	Nuclear radiation is harmful to the human body and is not suitable for large diameter containers	The device does not need to open holes	Higher
6	Float level gauge	Indirect contact with the medium, the floating ball has strict requirements for sealing	Cannot measure viscous media	Hole on the top of the device	Low
7	Externally attached liquid level gauge	Completely non-contact measurement. It can be used in harsh environments and is easy to install. Easy to maintain.	The viscosity of the medium is less than 10 mpa.s, and the medium cannot contain a lot of bubbles.	The device does not need to open holes	Medium
8	Magnetostrictive level gauge	High-precision measurement. Large range measurement. The liquid level and interface can be measured at the same time. Suitable for oil-water mixing measurement.	If the medium is in direct contact, the floating ball sealing requirements must be strict, and the viscous medium cannot be measured.	The device needs to be opened	Upper middle class
9	Hydrostatic pressure level gauge	High measurement accuracy; easy installation; signals can be transmitted remotely and remotely; It can resist the corrosion of various media by choosing different materials; it is suitable for explosion-proof occasions;	The measurement signal needs to be converted; the density of the measurement medium must be uniform	The device needs to be opened	Low
10	Radar level gauge	The measurement accuracy is high and the application range is wide.	When there are obstacles such as stirrers and pipelines in the storage tank, these obstacles will also reflect electromagnetic wave signals, thereby generating false liquid level signals.	The equipment needs to be opened	Higher
11	Guided wave radar level gauge	Guided wave radar level gauge is not limited by the dielectric constant; the measurement of the fluctuating medium is more stable	Not suitable for measuring corrosive and adhesive liquids, nor suitable for occasions with high food grade requirements	The equipment needs to be opened	Higher

Extended reading: Radar Oil Tank Level Sensor

The float level gauge is designed based on the Archimedes buoyancy principle and magnetic coupling. With its simple structure, easy operation, good reliability, high accuracy, and low consumption. It is commonplace in industrial applications and is quite popular.

It is widely used in the industrial measurement and control of the liquid level of various liquid tanks such as dam (reservoir) water level detection, sewage treatment, petrochemical raw material storage, food and beverage, and underground storage of gas stations.

When using the float level timer, you should choose different materials to adapt to it according to the chemical properties of the liquid.

Depending on the density of the liquid, different floats can be selected to match it to achieve the best measurement accuracy.

A magnetic Level Gauge is also called a magnetic level indicator. Magnetic Level Gauge is developed based on the principle of buoyancy and magnetic effect. The magnetic float in the measuring cylinder drives the two-color turning column on the external display of the measuring cylinder to flip with the increase (decrease) of the liquid level to be measured. As the position of the float changes, the indicator moves up and down the same amount. Supports top-mounted and side-mounted. It can be used for liquid level detection in high temperature, low temperature, high pressure, strong corrosion, highly toxic and dangerous environments.

Extended reading: fuel tank liquid level sensor 4-20ma

The glass tube level gauge is equipped with connecting flanges on the upper and lower valves of the instrument. The flange joint is welded with the container under test to form a communicating device. Therefore, the height of the medium level in the container can be directly displayed on the glass tube.

Safety steel balls are installed in the upper and lower valves of the glass tube level gauge. When the glass tube is broken due to an accident. The steel ball can block the passage under the action of the working pressure of the container. This way the valve will automatically seal. To prevent the medium in the container from continuing to flow out.

The lower end of the glass tube level gauge is equipped with a sewage valve. It is used for sampling, flushing or draining residual liquid by operators during normal production.

The glass tube level gauge is suitable for the measurement of the liquid level in various storage tanks, tanks, towers, and other containers in the petrochemical industry.

The purely mechanical structure has no electronic components. There will be no instability of electronic liquid level products. Therefore, operating costs are lower. At the same time, it is more reliable than the electronic type. Magnetic flap level gauges, glass tube level gauges, glass plate level gauges, buoy level gauges, etc., are all mechanical liquid level display instruments that are currently used in the domestic market. They are widely used in petroleum, metallurgy, chemical, papermaking, and other industries.

Compared with the electronic level gauge, the biggest feature of the mechanical level gauge is that the internal structure is very simple and the counting is intuitive. A variety of materials are available, which can be anti-corrosion and explosion-proof, and can be adapted to various installation environments.

Common Applications of Tank Level Gauges

It can be said that almost all types of level gauges can measure the level of the water storage tank.

You can choose the appropriate level gauge according to your own installation method, accuracy requirements, installation requirements, cost budget, etc.

Read more about Water level sensor Solutions

Diesel fuel tank level gauges for industrial oil storage tanks are very important, for level monitoring. Can be divided into mechanical and electronic.

Diesel tank gauges are installed onto industrial diesel tanks. It is used to directly or indirectly measure the liquid level of oil and other media. for the purpose of monitoring fuel consumption or reserve. They are often combined with a diesel tank alarm. This can effectively detect and control diesel fuel consumption.

Magnetic Level Gauge/Indicator

Posted on October 12, 2021 by KimGuo11

What is a magnetic type level gauge?

Get a Quote

Level Sensors

The parts and components of Magnetic Level Gauge are made of 304, 321, 316L, 1Cr18Ni9Ti, 00Cr17Ni14Mo2, 0Cr18Ni9, 304 or 0Cr18Ni9 lined with PTFE (polytetrafluoroethylene), PVC, PP, and other materials. And imported high-quality electronic components. The product has high reliability, good stability, long-lasting durability, and strong corrosion resistance.

Its characteristics are very significant:

Simple structure, Sturdy and reliable, durable, almost no maintenance workload, can be installed and used outdoors for a long time;
The measured medium is completely isolated from the display part of the level gauge, the level sensor, and the magnetic switch;
Wide working pressure range, withstand pressure from vacuum to 42MPa. The lowest density can reach 0.45g/cm3;
Wide operating temperature range, suitable for -190~+425℃;
Not affected by the physical and chemical state of the measured medium. Such as the medium’s conductivity, dielectric constant, foam, pressure, temperature, evaporation, boiling, bubbles, etc. It is widely used in various strong and weak corrosive, flammable and explosive. Toxicity, strong radioactivity, agitated, dirty liquid level, and interface measurement;
Optional single-pole single-throw (SPST), single-pole double-throw (SPDT) passive bistable magnetic switches. Realize high and low liquid levels, interface control, or alarm. The number of magnetic switches is not limited.
Optional reed pipe liquid level sensor, magnetostrictive liquid level sensor, capacitive two-wire liquid level sensor. Output 4~20mADC (or with HART protocol) signal. Realize remote centralized measurement and control.
The two-wire liquid level sensor can be equipped with LED digital display, which is convenient for night observation.

Installation form content		Side-mounted	Top-mounted
Installation spacing	Stainless steel	500～5000(mm)	500-2500(mm)
(Survey range)	ABS、PP-R	500～4000(mm)
Work pressure		0.6,1.6,2.5,4.0MPa	0.6,1.6,2.5MPa
Media density		＞0。6g/c	＞0.76g/c
Fallan Connection	Stainless steel	Farange 20-40 (DN20 PN1.0-4.0) (GB9119-88)	Farange 200-25 (DN200 PN1.6) (GB9119-88)


	ABS	Farange 20-10 (DN20 PN1.0) (GB9119-88)	Farange 200-6 (DN200 PN0.6) (GB9119-88)


Main material		ICr18Ni9Ti, ABS, PP-R (working pressure of 0.6MPa)
Medium temperature		-40～100℃(ABS、PP-R：-40～80℃)
Environmental temperature		-40～+70℃
Schematic error		±100mm
Medium viscosity		≤1st(10-4 /s)
Upper and lower limits Switch output		1, control sensitivity: 10mm 2, output connector capacity: AC220V 2A 3, connection life: 5 × 104 times 4, explosion-proof characteristics: iaIICT4 essential safety type



Electric teletransmission and continuous display		1, accuracy:±1.5% 2, Output load: 750 Ω 3, output signal: 4~20mA output, 24V DC second-line system 4, explosion-proof characteristics: iaIICT4 essential safety type

In order to meet the needs of different occasions, environments, and functions, Magnetic Level Gauge can add the following options:

Optional single-pole single-throw (SPST), single-pole double-throw (SPDT) passive bistable magnetic switches to achieve high and low liquid level, interface control or alarm. The number of magnetic switches is not limited.
Optional two-wire magnetic liquid level sensor, output 4~20mADC signal, realize remote measurement and control,
Optional two-wire magnetostrictive or capacitive liquid level sensor, output 4 ~ 20mADC, to achieve high-precision, continuous measurement and control. Selection of the technological interface form of the level gauge.
The top and bottom structure of the level gauge are selected. Output 4~20mADC with HART protocol

Image source: https://instrumentationforum.com/t/magnetic-liquid-level-gauges-working-principle/5242

The Magnetic Level Gauge adopts the principle of the communicating device and is connected to the container through the gas-phase and liquid-phase connection flanges. According to the principle of buoyancy and magnetic coupling, the magnetic float in the measuring cylinder (that is, the communicating device) drives the two-color flipping column on the external display of the measuring cylinder to flip with the increase (decrease) of the liquid level to be measured.

When the liquid level rises, the magnetic float drives the turning column to rotate 180°, displaying red or green; when the liquid level drops, the magnetic float drives the turning column to rotate 180° in reverse, displaying white. The height of the red band (or green band) is the height of the measured liquid surface, which realizes the purpose of measuring and displaying the position of the measured liquid (interface) surface.

Each magnetic turning column is a two-color axial symmetric structure. The distance between the two magnetic turning columns is 10mm. White and red (or green) are used to indicate the gas phase and the liquid phase, and the red (or green) and white junctions It is the boundary between the liquid phase and the gas phase.

Magnetic Level Gauge can measure both the liquid level and the interface between two different density media.

Product standards: HG/T2742-1995, HG/T21584-95.
Flange executive standard: HG/T20592~20615—2009 (when the order is not specified)

The working principle of the magnetic level gauge is to communicate with the container, so the liquid level in the measuring chamber will be the same as the liquid level in the container. The measuring chamber is equipped with a float, and there is a magnet in the float.

The float with magnets will float on the medium, and the magnets in the float will rotate the flaps of the indicating rail. The float in the measuring tube is standard, there is no pressure, no magnetism, or mechanical guidance.

This structure makes the risk of the float lower than that of the standard pressurized float. When necessary, pressurized floats can be produced.

With the below-mentioned process conditions, it is possible to select a float that will float on the medium.

Medium
Density
Working pressure
Operating Temperature

Magnetic Level Indicators can be directly used to observe the level of the medium in various containers. It is suitable for liquid level indication in petroleum, chemical, and other industrial fields. The liquid level gauge has a simple structure, intuitive and clear observation, no blockage, no leakage, convenient installation, and simple maintenance.

Extended reading: RF Admittance Level Sensor

Magnetic Level Gauge can be widely used in petroleum, chemical, oil field, medicine, food, wine, and other industries.

Various liquid storage tanks, storage tanks, liquid storage tanks, reaction tanks, fermentation tanks, liquid ammonia storage tanks, ammonia separators, boiler drums, deaerators, drain boxes, return tanks, high and low-pressure heaters, condensers, Evaporator.

Measurement and display of the liquid level of the medium compatible with 304, 321, 316L, OCr18Ni9, 304 or 0Cr18Ni9+PTFE, 00Cr17Ni14Mo21Cr18Ni9Ti, PVC, PP, and other materials in other pressure vessels, and the interface of two different media.

There are a variety of installation forms for you to choose from, to meet the requirements of different occasions and environments.

Magnetic Level Gauge can be reliably used for liquid level detection in high temperature, low temperature, high pressure, strong corrosion, highly toxic, and dangerous environments.

Magnetic Float Level Switches & Sensors with Magnetic Reed Switches for Continuous Level Measurement.

Magnetic Float Level Sensor works with Reed Switch, is a continuous level sensor. SI-U04 Magnetic Float Level Sensor-Reed operates on a direct, simple principle. As the magnetic float rises and falls as liquid levels change. The magnetic field generated from the inside of the float drives the sealed reed switch installed in the stem. The stem is made of non-magnetic metal or strong engineering plastic.

Magnetic Float Level Sensor gets the liquid level signal, transfers it into digital current signal and switching signal. Generally speaking, there are two structures of magnetic floats. Besides, the Magnetic Float Level Sensor supports multiple mounting methods. Such as top-mounted, side-mounted. So SI-U04 Magnetic Float Level Sensor can be applied to a variety of tank level measurements.

Extended reading: Amazing Solutions for Continuous Liquid Level Measurement

Still have questions?

If you cannot find an answer to your question in our FAQ, you can always contact us
and we will be with you shortly.

Contact Support

More Featured Level Gauges/Indicators

Rigid Probe Magnetostrictive Level Transmitter

Integral flange Magnetostrictive level sensor

Digital Display Magnetostrictive liquid level sensor

Based on the product selection, we can determine the price of the level transmitter. Sino-Instrument is a manufacturer of level transmitters, so we offer the best price.
For example: The reference price of a differential pressure level transmitter is around USD 400.

Request a Quote

Please enable JavaScript in your browser to submit the form

Extended reading: Ultrasonic flow detectors types

Velocity Flow Meters

Posted on October 11, 2021 by KimGuo11

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.

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 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

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

Get a Quote Ultrasonic Flow Meters

Strap on Ultrasonic Flow Meters

Posted on October 8, 2021 by KimGuo11

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.

Featured Strap on Ultrasonic Flow Meters

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-guidelines Download

Clamp-on-flow-transducer Download

Ultrasonic-Flow-meter-User-Manual Download

Frequently
Asked
Questions

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.

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

According to the way of use

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

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.

According to whether the transducer is in contact with the fluid

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

According to the nature of the measured fluid

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

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.

Get a Quote Radar Level Measurement

List of Radar Level Sensors

Posted on October 6, 2021 by KimGuo11

Non-contact radar level sensor

Radar level sensors are used for continuous non-contact level measurement of liquids or solids. And convert it into electrical signals. The radar level sensor emits high-frequency radio frequency pulses from its antenna. The pulse passes through the air gap. Reflects on a liquid or solid surface and returns to the antenna. The radar level sensor determines the flight pulse time and converts it to level height or distance. It can provide reliable liquid level measurement in difficult tanks with foam, steam, temperature or pressure, or liquid storage tank applications. Or dusty silos, silos, stockpiles, crushers, or transfer station applications. It contains 3-30 meters of grains, granules, powder, or aggregates.

List of Radar Level Sensors

Radar Level Transmitters – 120GHz

Series	SI-FMF11	SI-FMF12	SI-FMF13	SI-FMF15	SI-FMF21
Applicable medium:	Liquid	Liquid	Liquid	Liquid	Solid
Measuring range:	0.05m~30m	0.05m~35m	0.1m~100m	0.1m~35m	0.3m~150m
Antenna:	32mm lens antenna	42mm lens antenna	78mm lens antenna	78mm lens antenna	78mm lens antenna + purging (or without purging)
Accuracy:	±2mm	±2mm	±2mm (range below 35m) ±5mm (range between 35m-100m)	±2mm	±5mm
Medium temperature:	-40～80℃	-40～110℃	-40～110℃	-40～200℃	-40～110℃
Medium pressure:	-0.1～0.3 MPa	-0.1～1.6MPa	-0.1～0.3MPa	-0.1～2.5MPa	-0.1～0.3MPa
Signal output:	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus	Two-wire system/4…20mA/HART protocol Four-wire system 4…20mA/ RS485 Modbus
Power supply:	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V	Two-wire system/DC24V Four-wire system/DC12~24V Four-wire system/AC220V
Shell:	Aluminum/plastic/stainless steel	Aluminum/plastic/stainless steel	Aluminum/plastic/stainless steel	Aluminum /Plastic /Stainless steel	Aluminum/plastic/stainless steel
Process connection:	G1½A / 1½NPT thread / flange ≥DN50	G2A thread/flange≥DN65	Flange ≥DN80	Flange ≥DN80	Flange ≥DN80

Radar Level Transmitters – 80 GHz

Series	LM78x0	LM78x1	LM78x2
Applicable medium:	For normal solid application	For liquid application	For large range solid application
Measuring range:	0.3 m ~ 60m	0.08m~30m	0.6m ~ 120m
Antenna:	Lens antenna/ anti-corrosive antenna / flange isolated by quartz	Lens antenna/ anti-corrosive antenna / flange isolated by quartz	Lens antenna/ anti-corrosive antenna / flange isolated by quartz
Accuracy:	±1mm	±1mm	±1mm
Medium temperature:	T0:-40~85℃; T1:-40~200℃; T2:-40~500℃; T3:-40~1000℃	T0:-40~85℃; T1:-40~200℃; T2:-40~500℃; T3:-40~1000℃	T0:-40~85℃; T1:-40~200℃; T2:-40~500℃; T3:-40~1000℃
Medium pressure:	-0.1~2MPa	-0.1~2MPa	-0.1~2MPa
Signal output:	4 ~ 20mA or RS-485	4 ~ 20mA or RS-485	4 ~ 20mA or RS-485
Power supply:	15~28VDC	15~28VDC	15~28VDC
Shell:	Aluminum alloy, stainless steel	Aluminum alloy, stainless steel	Aluminum alloy, stainless steel
Process connection:	Thread or flange	Thread or flange	Thread or flange

Radar Level Transmitters – 26 GHz

Series	SIRD-901	SIRD-902	SIRD-902T	SIRD-903	SIRD-904	SIRD-905	SIRD-906	SIRD-908	SIRD-909
Applicable medium:	All kinds of corrosive liquid	Slightly corrosive liquid	Corrosive liquids, vapors, volatile liquids	Solid material, Strong dust easy to crystallize, condensation occasion	Solid material, Strong dust, easy to crystallize, condensation occasion	Solid particles, Powder	Hygienic liquid storage, Corrosive container	Rivers, Lakes, Shoal	Rivers, Lakes, Shoal
Measuring range:	10 meters	30 meters	20 meters	70 meters	80 meters	30 meters	20 meters	30 meters	70 meters
Antenna:	Sealing horn / PTEE	Horn Antenna Φ46mm/ Horn Antenna Φ76mm /Horn Antenna Φ96mm / Special Custom	Internal tapered rod antenna PVDF / 78mm Internal tapered rod antenna PFA / 78mm	Horn Antenna Φ76mm / Φ96mm / Φ121mm/Special Custom	Parabolic antenna Φ196mm /Φ242mm	Horn Antenna Φ76mm / Φ96mm / Φ121mm/Special Custom	Viton / (-40~130) ℃	Horn antenna with 76mm/ 96mm	Horn antenna with 76mm/ 96mm/ special custom
Accuracy:	± 5mm	± 3mm	±3mm	±15mm	±15mm	±15mm	± 3mm	± 3mm	± 10mm
Medium temperature:	-40℃~130℃	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃~130℃(Standard type) -40℃~250℃(High-temperature type)	-40℃ ~ 130℃	-40℃ ~ 100℃	40℃ ~ 100℃
Medium pressure:	-0.1~0.3 MPa	-0.1 ~ 4.0 MPa	-0.1~2.0 MPa	-0.1~4.0 MPa (Flat flange) -0.1~0.3MPa (Universal flange)	-0.1 ~ 0.3 MPa	-0.1 ~ 4.0 MPa (Flat flange) -0.1 ~ 0.3 MPa (Universal Flange)	-0.1~4.0 MPa	Normal-pressure	Normal-pressure
Signal output:	4… 20mA /HART （2-wire / 4-wire） RS485/ Modbus	4… 20mA /HART（2-wire / 4-wire） RS485/ Modbus	4… 20mA /HART（2-wire / 4-wire） RS485/ Modbus	4… 20mA /HART （2-wire / 4-wire） RS485/ Modbus	4… 20mA / HART (2-wire / 4-wire ) RS485/ Modbus	4… 20mA /HART (2-wire / 4-wire ) RS485/ Modbus	4… 20mA/HART (2-wire / 4-wire ) RS485/ Modbus	RS485 / Modbus ( 6~24V DC) 4~20mA / Hart Two-wire ( 24V DC)	RS485 / Modbus ( 6~24V DC) 4~20mA / Hart Two wire ( 24V DC)
Power supply:	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V ）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	2-wire（DC24V）/ 4-wire（DC24V /AC220V）	(6 – 24V) DC / Four-wire 24V DC / Two wire	(6 – 24V) DC / Four-wire 24V DC / Two wire
Shell:	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic /Single chamber	Aluminum / Plastic / Single chamber
Process connection:	Thread, Flange	Thread, Flange	Flange	Universal Flange	Thread, Universal Flange	Thread, Flange	Flange	Thread G1½ A″ /Frame /Flange	Thread G1½ A″ /Frame /Flange

Radar Level Sensors – 6 GHz

Series	SIRD-801	SIRD-802	SIRD-803	SIRD-804	SIRD-805	SIRD-806
Applicable medium:	Liquid, slightly corrosive liquid	Liquid, especially for corrosive liquid	Liquid, especially with pressure and Volatile Liquid	Solid particles or block material, And it is not suitable for solid powder	Liquid, especially suitable for low dielectric constant, sticky, with mixing liquid	Solid, especially suitable for high temperature conditions
Measuring range:	20m	20m	35m	35m	20m	15m
Antenna:	The Rod Antenna ( PP/PTFE )	The Rod Antenna (PTFE)	The Horn Antenna	The Horn Antenna	The Horn Antenna	The Horn Antenna
Accuracy:	±10mm	± 10mm	± 10mm	± 20mm	± 10mm	± 20mm
Medium temperature:	(-40 ~ 130) ℃	-40℃~130℃（Standard type） -40℃~180℃（High temperature type）	-40℃~130℃（Standard type） -40℃~250℃（High temperature type）	-40℃~130℃（Standard type） -40℃~250℃（High temperature type）	-40℃~130℃（Standard type） -40℃~250℃（High temperature type）	(-40 ~ 400) ℃
Medium pressure:	(-0.1 ~ 0.3) MPa	(-0.1 ~ 1.6) MPa	(-0.1 ~ 4) MPa	(-0.1 ~ 0.3) MPa	(-0.1 ~ 4) MPa	(-0.1 ~ 0.3) MPa
Signal output:	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART	(4 ~ 20) mA/HART
Power supply:	Two-wire (DC24V) Four-wire（DC24V / AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）	Two-wire (DC24V) Four-wire（DC24V/AC220V）
Shell:	Aluminum /Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel	Aluminum / Plastic / Stainless steel
Process connection:	Flange (optional) / Thread	With PTFE plate flange	Flange (optional) / Thread	Universal joint flange	Flange	Flange

Radar Level Sensor Advantages and Disadvantages

Advantages of radar level measurement

Measurement is not affected by temperature, pressure, or dust
User-friendly adjustment saves time
Non-contact, continuous level measurement over larger ranges
Unaffected by sludge and biomass, dust, foam, oil, grease and other coatings, uneven surfaces, turbulence, pressure, and vacuum
Single-frequency radar level sensors for liquid sensing, dual-frequency radar level sensors for level measurement of aggregates, gravel, sand, coal, asphalt, and other solids
Simple mounting and push-button calibration

Disadvantages of radar level measurement

Very sensitive to build-up on the sensor surface.
They are very expensive. Price increases with accuracy.

Extended reading: Amazing Solutions for Continuous Liquid Level Measurement

Radar Level Sensor Working Principle

Radar Level Measurement and guide wave radar level measurement
Image source: https://instrumentationtools.com/radar-level-measurement/

Very short microwave pulses with very low energy are transmitted and received through the antenna system. The radar wave runs at the speed of light. The operating time can be converted into level signals by electronic components. A special time extension method can ensure stable and accurate measurement in a very short time.

Electromagnetic waves propagate in the air at the speed of light. The distance between the radar level gauge and the surface of the material can be expressed by the following formula: 　　

D = (1/2)*CT

In the formula:

D ———the distance between the radar level gauge and the surface of the material; 　　

C ———Speed of light 　　

T ———Pulse time.

Then the liquid level is: 　　L = E-D

In the formula:

L — liquid level; 　　

E ———The total height of the tank; 　　

D ———Air height.

Even in the presence of false reflections, the new micro-processing technology and the unique ECHOFOX- software can accurately analyze the level echo. By inputting the size of the container, the distance value can be converted into a signal proportional to the level. The instrument can be debugged with empty positions.

Radar Level Sensor Application

From the shape of the tank, Radar Level Sensor can measure the liquid level of spherical tanks, horizontal tanks, cylindrical tanks and cylindrical cone tanks.
As far as storage tank functions are concerned, Radar Level Sensor can measure the liquid level in storage tanks, buffer tanks, microwave tubes and bypass tubes.
From the measured medium, Radar Level Sensor can measure liquids, particles, slurries, etc.

Radar Level Sensor for Solids

Radar Level Sensor is widely used in the measurement of solid material levels in the industry. It has a good measurement effect for the working conditions of extreme dust and various interference factors that affect the measurement in the silo.

Material storage level detection in the mining industry. Level detection of silos such as coarse broken silos, fine broken silos and fine ore silos.
Storage level detection of materials in the coal industry. Including the level detection of raw coal silos, clean coal silos and other silos.
Material storage level detection in the cement industry. Including clinker warehouse, raw meal homogenization warehouse, raw material mixing warehouse, limestone storage warehouse, raw coal warehouse, cement mixing warehouse and other silo level detection.
Storage level detection of materials in the power industry. Such as the detection of raw coal silos, pulverized coal silos and dry ash silos in thermal power plants.

Radar Water Level Sensor

Radar Level Sensor is a level detection instrument using microwave technology.

It is mainly suitable for detecting the water level of natural waters such as rivers and lakes. It can also be used to detect the water level of large-scale reservoirs, reservoirs, sewers, and other open-air channels.

As a detection terminal, this product can effectively assist in monitoring water level changes and provide accurate water level information for monitoring units.

The product adopts the pulse radar detection method. It can work stably around the clock. The measurement result is accurate and reliable.

The non-contact detection method makes it more widely used. It can even be used in complex water environments with organic pollutants or sediments.

Ultrasonic vs Radar Level Sensor

What is the difference between Ultrasonic Level Sensor and Radar Level Sensor?

Ultrasonic Level Sensor and Radar Level Sensor are non-contact liquid level measuring instruments. As the name suggests, one uses ultrasonic waves and the other uses electromagnetic waves. In addition, what are the differences between ultrasonic level sensors and radar level sensors?

Ultrasonic Level Sensor

Ultrasonic Level Sensor is a digital level meter controlled by a microprocessor. In the measurement, the pulsed ultrasonic wave is emitted by the sensor (transducer). The sound waves are received by the same sensor after being reflected by the surface of the object and converted into electrical signals.

The distance between the sensor and the object to be measured is calculated from the time between the emission and reception of the sound wave.
Because of the non-contact measurement. The measured medium is almost unlimited. It can be widely used to measure the height of various liquid and solid materials.

Radar Level Sensor

Radar Level Sensor adopts the circuit design of a high-frequency microstrip line structure. The internal circuit generates microwave pulse signals.

Based on the design principle of the high-frequency waveguide, the microwave pulse is emitted from the end of the antenna through the PTFE emitter.

When the transmitted pulse hits the surface of the measured medium. Part of the energy is reflected back and received by the same antenna.

Through the principle of time extension technology, the time interval between the transmitted pulse and the received pulse is calculated. So as to further calculate the distance from the antenna to the surface of the measured medium.

Simply put:

The relative price of Radar Level Sensor is relatively high;
Radar Level Sensor has higher accuracy than ultrasonic;
The measuring range of radar is larger than that of ultrasonic;
When using Radar Level Sensor, consider the dielectric constant of the medium.
Radar Level Sensor has horn type, rod type and cable type. Compared with ultrasonic, it can be applied to more complicated working conditions;
Ultrasonic cannot be applied to working conditions such as vacuum, high steam content or foam on the liquid surface.

Extended reading: The Secret of Ultrasonic Level Measurement

Radar Level Transmitter Calibration

How do you calibrate the radar level transmitter?

Set up the guided wave radar level transmitter

HART communicator, power supply, and the multimeter are as below (see below calibration setup Diagram).

Check the configuration of the lower range value (0% level, 4 mA) and high range value (100% level, 20 mA).
Make sure that the inputted data is as per the datasheet.
For example, the lower range value is 10 inch and the high range value is 35 inches (both of it are measured from the bottom of the level transmitter probe)

Fill the level transmitter chamber with water up to the 0% level.
Read the level measurement in the transmitter LCD (or in the HART communicator). Set this condition as 0% level through the HART communicator.

Read the mA output of the transmitter by using a multimeter.
Adjust (if any) through the HART communicator so that the output of the transmitter (on the multimeter) is 4 mA.

Fill the level transmitter chamber with water up to 100% level.
Read the level measurement in the transmitter LCD (or in the HART communicator). Set this condition as 100% level through the HART communicator.

Read the mA output of the transmitter by using a multimeter.
Adjust (if any) through the HART communicator so that the output of the transmitter (on the multimeter) is 20 mA.

Frequently
Asked
Questions

Help Center

Radar level instruments measure the distance from the transmitter (located at some high point) to the surface of a process material located farther below in much the same way as ultrasonic transmitters – by measuring the time-of-flight of a traveling wave.

A guided wave radar level transmitter is also called a wave-guided radar level sensor. They can measure both levels and the interface between two media. Through probe rod or cable, complete level contact types continuous level measurement. Such as Coaxial Probe Guided Wave Radar Level Transmitter. This is different from ultrasonic level measurement, which is a non-contact measurement. A guided wave radar level transmitter is often used for tank level measurement. Including liquid and solid. Output 4～20mA/HART, so as to measure and control the level during production.

Extended Reading: Guided-wave radar (GWR) level transmitter working principle

Sino-Inst offers over 50 Radar level sensors for level measurement. About 50% of these are Radar level meters, 40% is the tank level sensor.

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

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

Request a Quote

Get a Quote Digital Flow Meters

4-20ma Flow Meters

Posted on September 27, 2021 by KimGuo11

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.

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:

Since the transmitted signal is a voltage signal, the transmission cable will be interfered by noise;
The distributed resistance of the transmission cable will produce a voltage drop;
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:

They convert the temperature signal of the thermocouple or thermal resistance sensor into a 4-20mA signal and then output;
The controller then translates 4-20mA into a specific temperature value;
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…..

**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.

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 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.

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

High measurement accuracy requirements;
The watch body is made of stainless steel, anti-corrosion and anti-rust;
The quick-loading structure is convenient for cleaning and maintenance.
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.
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.
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.

Read more about Digital flow meter working principle

Related Blogs

Ultrasonic Flow Detectors

Ultrasonic flow detectors are an important part of ultrasonic flow meters. Ultrasonic flow detectors are also called ultrasonic…

Flow Rate and Pressure Relationship-How to Calculate?

Once the piping system is identified, there are 2 main types of pressure and flow relationships in the…

What is a Venturi Tube?

what is a venturi tube? The Venturi Tube is a tubular device commonly used to measure fluid flow…

Molasses Flow Meters-High Viscosity Liquids Solution

Molasses flow meters are a type of flow meter used for molasses flow measurement. Molasses are common high…

Solvent flow meters

The solvent flow meter is a flow meter that can measure solvent volume or mass flow. In the…

Grease Flow Meters

What is a Grease Flow Meter? Grease Flow meters are meters dedicated to measuring the volume or mass…

3 inch (3″) Water Meter

Low cost 3″ Water Meter 3″ water meter is also DN80 water meter. Easy to read. Totalizing water…

2 inch Water Flow Meter

2 inch water flow meter is also written as 2″ flow meter. If you are planning to buy…

Industrial CO2 flow meters

CO2 flow meters are instruments that can measure the flow of gaseous or liquid carbon dioxide. CO2 is…

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