Standard Platinum Rhodium Thermocouple

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.


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.

First-Class Standard Thermocouple WRPB-1

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.

  1. Model: WRPB-1
  2. First-class standard thermocouple length: L=Φ0.5×1000mm
  3. The temperature range of the first-class standard thermocouple: 300-1300℃
  4. First-class standard thermocouple indexing number: S type (platinum rhodium 10-platinum)
  5. 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  
  6. 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

  1. 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.
  2. According to “Standard Platinum Rhodium 10-Platinum Thermocouple Verification Regulations” (JJG75-1995), regular supervisory inspection and periodic verification shall be carried out.
  3. 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

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.

  1. Second-class standard thermocouple model: WRPB-2
  2. The temperature measurement range of the second-class standard thermocouple: 300-1300℃
  3. The length of the second-class standard thermocouple: L=1000mm (the diameter of the coupler wire is Φ0.5mm)
  4. Indexing number: S type (platinum rhodium 10-platinum)
  5. 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

  1. 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.
  2. 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.
  3. 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. 
  4. 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

  1. 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.
  2. 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.
  3. 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

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.

  1. 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.
  2. 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.
  3. 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
  4. 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.
  5. 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.
  6. 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:

  1. 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;
  2. The temperature coefficient of resistance is small, the conductivity is high, and the specific heat is small;
  3. 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;
  4. 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?

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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.

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Tank Level Gauges & Indicators

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

Tank Level Gauges Types

No.Gauge typeMain featuresDisadvantageInstallation methodPrice
1Ultrasonic level gaugeNo direct contact with the medium, only the gas phase part. Read more about: Ultrasonic Tank Level Sensors for Tank Level MonitoringThe accuracy is relatively low. It is not possible to measure pressure vessels. Cannot measure volatile media.Top installation, the device needs to be cutMedium
2Radio Frequency Admittance Level GaugeMeasurable interfaceIt is not easy to calibrate. The measuring medium must not be vicious. Otherwise, the probe hanging material will affect the measurement accuracyHole on the top of the deviceMedium
3Magnetic flap level gaugeIntuitive and easy to installThe magnetic ball gets stuck easily. Make it impossible to transmit instructions remotelyTo connect to the device, need to open a holeLow 
4Differential pressure level gaugeWide range of popularization, easy to calibrateIt 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 openedLower middle class
5γ-ray level gaugeNon-contact measurement with medium, high accuracyNuclear radiation is harmful to the human body and is not suitable for large diameter containersThe device does not need to open holesHigher
6Float level gaugeIndirect contact with the medium, the floating ball has strict requirements for sealingCannot measure viscous mediaHole on the top of the deviceLow
7Externally attached liquid level gaugeCompletely 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 holesMedium
8Magnetostrictive level gaugeHigh-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 openedUpper middle class
9Hydrostatic pressure level gaugeHigh 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 uniformThe device needs to be openedLow
10Radar level gaugeThe 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 openedHigher
11Guided wave radar level gaugeGuided wave radar level gauge is not limited by the dielectric constant; the measurement of the fluctuating medium is more stableNot suitable for measuring corrosive and adhesive liquids, nor suitable for occasions with high food grade requirementsThe equipment needs to be openedHigher

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.

Read more about:

Diesel fuel tank level gauges & Indicators

Oil-water Interface Level Measurement Guide

Propane tank level indicator is also called propane tank gauge level indicator, or propane tank level gauge. What kind of level gauge is used for Industrial propane level measurement?

Propane is a gas that can be liquefied. Chemical formula CHURCH, colorless, liquefiable gas. Slightly soluble in water, soluble in ethanol and ether.
Common Industrial Propane Tank Level Indicators for Industrial Tank Level Measurement include radar level sensor; magnetostrictive level sensor; float level gauge; magnetic flap level gauge; ultrasonic level gauge.

Read more 5 Industrial Propane Tank Level Indicators

There are many types of liquid level measuring instruments. But in the process of measuring LPG liquid level gauges. Due to the particularity of the medium, some measuring instruments cannot meet the requirements of the on-site working conditions. The current technology is constantly flying over at any time. Like the radar level The birth of the pressure gauge and the differential pressure level completely solved this problem in the LPG liquid level gauge measurement process.

Like plane radar, guided wave radar, high-frequency radar, etc. From the characteristics of these types of radar level gauges, guided wave radar is widely used. The difference between guided wave radar level gauges and other radars is that the guided wave radar liquid The position gauge needs to be in contact with the medium to measure. Therefore, its use cost is also low.

Extended reading: ultrasonic level sensor price

For buried tanks, liquid level timing should be selected. First of all, according to its structural design, only the top-mounted liquid level gauge can be used. Of course, there are many types of top installations. We can make and order according to our own specific working conditions when we choose.

The top-mounted level gauges include ultrasonic level gauges, radar level gauges, top-mounted magnetic flap level gauges, top-mounted float level gauges, drop-in level gauges, and so on. These are different according to their respective working conditions and functions. The price is also different. It is necessary to consider the sum of all aspects.

Extended reading: Non Contact Liquid Level Sensor Working Principle

Still have questions?

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

Read more about: How to Choose the Right Diesel Fuel Level Sensor ?

Sino-Inst offers over 50 Tank Level Gauges & Indicators for level measurement. About 50% of these are Radar level meters, 40% is the magnetic level sensor.

A wide variety of Tank Level Gauges & Indicators for level measurement options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Tank Level Gauges & Indicators instrumentation, located in China.

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Magnetic Level Gauge/Indicator

What is a magnetic type level gauge?

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.

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.

More Featured Level Gauges/Indicators

SI-U01 Float Level Sensor
SI-U02 Multi-Point Liquid Level Float Switch
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.

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Velocity Flow Meters

What is a velocity flow meter?

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

LEARN MORE

Flow Meter Types

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

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

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

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

Velocity Flow Meter Types

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

Advantages of using Electromagnetic Flow Meters.

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

Disadvantages of using Magnetic Flow Meters

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

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

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

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

Extended reading: Ultrasonic flow detectors types

Advantages of Ultrasonic Flow Meters

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

Disadvantages of Ultrasonic Flow Meters

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

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

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

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

Turbine Meter Advantages

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

Turbine Meter Disadvantages

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

Extended reading: Turbine Insertion Flow Meter for Large Diameter Pipeline

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

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

Extended reading: Vortex Steam Flow Meter

Advantages of vortex flowmeter

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

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

Disadvantages of vortex flowmeter

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

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

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

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

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

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

Extended Reading: Collection of Industrial Insertion Flowmeter Type

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

Area Velocity Flow Meter

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

Variable area flow meter advantages and disadvantages

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

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

Mechanical Flow Meter

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

Guess you like: What is Reynolds number?

Extended reading: Mechanical flow meter types

Frequently
Asked
Questions

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.

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Strap on Ultrasonic Flow Meters

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

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.

  1. According to the measurement principle

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

More about Different Types of Flowmeters – Technical and Application Analysis

  1. According to the way of use

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

  1. According to the installation method of the transducer

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

Read more: Insertion Type Ultrasonic Flow Meter Applications

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

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

  1. According to the nature of the measured fluid

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

  1. According to the number of transducer channels

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

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

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

(1) Branch channel flow monitoring (narrow channel)

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

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

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

(2) Main channel flow monitoring (wide channel)

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

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

(3) Monitoring of urban drainage pipeline flow

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

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

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

Extended reading: metal tube flow meter

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

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

List of Radar Level Sensors

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:LiquidLiquid Liquid Liquid Solid
Measuring range:0.05m~30m0.05m~35m0.1m~100m0.1m~35m0.3m~150m
Antenna:32mm lens antenna42mm lens antenna78mm lens antenna78mm lens antenna78mm 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 steelAluminum/plastic/stainless steelAluminum/plastic/stainless steelAluminum /Plastic /Stainless steelAluminum/plastic/stainless steel
Process connection:G1½A / 1½NPT thread / flange ≥DN50G2A thread/flange≥DN65Flange ≥DN80Flange ≥DN80Flange ≥DN80

Radar Level Transmitters – 80 GHz

SeriesLM78x0LM78x1LM78x2
Applicable medium:For normal solid applicationFor liquid applicationFor large range solid application
Measuring range:0.3 m ~ 60m0.08m~30m0.6m ~ 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-4854 ~ 20mA or RS-4854 ~ 20mA or RS-485
Power supply:15~28VDC15~28VDC15~28VDC
Shell:Aluminum alloy, stainless steelAluminum alloy, stainless steelAluminum alloy, stainless steel
Process connection:Thread or flangeThread or flangeThread or flange

Radar Level Transmitters – 26 GHz

SeriesSIRD-901 SIRD-902 SIRD-902T SIRD-903 SIRD-904 SIRD-905 SIRD-906 SIRD-908 SIRD-909
Applicable medium:All kinds of corrosive liquidSlightly corrosive liquidCorrosive liquids, vapors, volatile liquidsSolid material, Strong dust
easy to crystallize, condensation occasion
Solid material, Strong dust,
easy to crystallize, condensation occasion
Solid particles, PowderHygienic liquid storage,
Corrosive container
Rivers, Lakes, ShoalRivers, Lakes, Shoal
Measuring range:
10 meters
30 meters20 meters70 meters80 meters30 meters20 meters30 meters70 meters
Antenna:Sealing horn / PTEEHorn Antenna Φ46mm/ Horn Antenna Φ76mm /Horn Antenna Φ96mm / Special CustomInternal tapered rod antenna PVDF / 78mm
Internal tapered rod antenna PFA / 78mm
Horn Antenna Φ76mm / Φ96mm / Φ121mm/Special CustomParabolic antenna Φ196mm /Φ242mmHorn Antenna Φ76mm / Φ96mm / Φ121mm/Special CustomViton / (-40~130) ℃Horn antenna with 76mm/ 96mmHorn 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 MPaNormal-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 steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic /Single chamberAluminum / Plastic / Single chamber
Process connection:Thread, Flange Thread, Flange FlangeUniversal FlangeThread, Universal FlangeThread, FlangeFlange Thread G1½ A″ /Frame /Flange Thread G1½ A″ /Frame /Flange

Radar Level Sensors – 6 GHz

Series
SIRD-801
SIRD-802SIRD-803SIRD-804 SIRD-805 SIRD-806
Applicable medium:Liquid, slightly corrosive liquidLiquid, especially for corrosive liquidLiquid, especially with pressure and Volatile LiquidSolid particles or block material,
And it is not suitable for solid powder
Liquid, especially suitable for low dielectric constant, sticky, with mixing liquidSolid, especially suitable for high temperature conditions
Measuring range:20m20m35m35m20m15m
Antenna:The Rod Antenna ( PP/PTFE )The Rod Antenna (PTFE)The Horn AntennaThe Horn AntennaThe Horn AntennaThe 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 steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steel
Process connection:Flange (optional) / ThreadWith PTFE plate flangeFlange (optional) / ThreadUniversal joint flangeFlangeFlange

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:

  1. The relative price of Radar Level Sensor is relatively high;
  2. Radar Level Sensor has higher accuracy than ultrasonic;
  3. The measuring range of radar is larger than that of ultrasonic;
  4. When using Radar Level Sensor, consider the dielectric constant of the medium.
  5. Radar Level Sensor has horn type, rod type and cable type. Compared with ultrasonic, it can be applied to more complicated working conditions;
  6. 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.

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