Professional Partner for Measure &amp; Control

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.

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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.

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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.

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?

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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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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.

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.

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 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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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…..

**Rotameter flow meter-Variable Area Flow Meters**

**Insertion Ultrasonic Water Flow Meter**

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

Read More About: Paperless Recorder Working Principle

Flow Meter with Analog Output

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

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

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

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

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

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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.

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Get a Quote Ultrasonic Flow Meters

Ultrasonic Flow Detectors

Posted on September 25, 2021 by KimGuo11

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

Featured Ultrasonic Flow Meters Clamp-on

Features of Ultrasonic Flow Detectors

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

Optional Ultrasonic Flow Detectors

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

Moeld	X3-φ6.35	X3-φ9.53	X3-φ12.7	X3-φ15	X3-φ20	X3-φ25
Weight(KG)	0.91	0.91	0.9	0.9	0.84	0.84
Moeld	X3-φ32	X3-φ40	X3-φ50	X3-φ63	X3-φ75	X3-φ99
Weight(KG)	0.82	0.88	0.98	1.43	1.52	1.95

Ultrasonic Flow Detectors Working Principle

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

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

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

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

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

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

Frequently
Asked
Questions

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

Extended reading: Ultrasonic flow detectors types

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

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

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

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

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

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

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

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Sino-Inst, Manufacturer for Ultrasonic Flow Meters. It can measure a single sound-conducting liquid medium of DN 25—150mm. It can measure even liquids such as water, seawater, oil, and slurry.

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

Get a Quote More Level Sensors

Point Level Measurement Sensors

Posted on September 7, 2021 by KimGuo11

What is Point Level Measurement?

Point Level Measurement refers to the use of a point level sensor to detect the material level in a storage tank or silo. Also called point level Indicators, Controls, and Switches. This type of equipment is used when it is not necessary to measure every possible intermediate level. Just like in the case of continuous level measurement.

The point level sensor measures the preset level of liquid, mud, or solid media. And open or close the electrical contact at the desired set point. In some applications, sensors are also used to trigger pumps, valves, or other controls. To return the media to the preset level. Capacitive, ultrasonic, rotary, and vibrating liquid level switches are suitable for almost all applications from bulk solids to liquids and in between.

What is a point level sensor?

Liquid level measurement usually has two forms: continuous liquid level detection and point liquid level detection. In continuous level detection, the sensor continuously measures the level of liquid or solid in the tank. The point level sensor measures the preset level of liquid, mud or solid media, and opens or closes the electrical contact at the desired set point.

Point level sensor is also called liquid level switch, or liquid level controller. Point level sensor is used for point level detection. The sensor will detect the liquid at a certain point in the tank or chamber. Generally, this applies to processes that need to be managed at a high or low level.

Point level sensor is suitable for liquid, paste, powder, or bulk solid in a silo. You may encounter problems with property changes, turbulence, foam, vibration, or accumulation, but a wide range of sizes, installations and materials make inspection easy.

Common point level sensors, such as photoelectric level switch (SST sensor), horizontal float switch, vertical float switch, ultrasonic level sensor, tuning fork level switch.

Extended reading: Radar level sensor for solids – Dust solid level measurement

What is a continuous level sensor?

The continuous level sensor is designed to provide level detection through every point in the tank or chamber. This means that regardless of the liquid level, it can provide feedback across the entire range of the container. This is very useful for processes where knowing the level is always important and for applications that require increased accuracy.

Common continuous level sensors, such as submersible level sensors, ultrasonic level sensors, capacitive level sensors.

Media type (e.g. bulk, powder, liquid, paste, etc.)
Media properties (e.g. bulk density, conductivity, viscosity, etc.)
Input conditions (e.g. tank material, tank geometry, installation position, installations within the tank, etc.)
Process conditions (e.g. pressure, temperature, ambient conditions, explosion protection, hygiene requirements, etc.)

Extended reading: Applicaitons Of Magnetostrictive Level Transmitters

Point level sensor

A sensor designed for point detection will detect liquid at a certain point in the tank or chamber. Generally, this applies to processes that require high-level or low-level management.

In most cases, they act as switches when the tank level rises or falls to a certain level. This could be an alarm or a bonding device. Essentially, the sensor detects when the liquid has reached the desired point, and it acts as a switch to activate the necessary response.

Continuous level sensor

The continuous level sensor is designed to detect the level through every point in the tank or chamber. This means that it provides feedback regardless of the level and the entire container range. This is great for processes where the level is always important, and for applications that require increased accuracy.

Extended reading: Radar Oil Tank Level Sensor

Looking for a specific type or a custom continuous liquid level sensor? Sino-Inst offers High-quality Liquid level sensors for continuous level measurement.

Level sensors are used in process control in many industries and they fall into two categories. Continuous level measurement sensors and Point level measurement sensors. The point level measurement sensor is used to indicate a single discrete level, that is, to indicate a preset level.

The function of this type of sensor is the upper limit alarm, which indicates the overfill condition, or the lower limit alarm condition. Continuous level sensors are more complex, allowing level monitoring of the entire system. They measure the level of the liquid level in a range, not the level of a point. Continuous level sensors produce an analog output that is directly related to the liquid level in the container. To build a level measurement system, this output signal is transmitted to the process control loop and visual indicators.

Types of Point level measurement

Liquid level measurement is a key link to realize the automated production of industrial processes. According to the difference of its output, it can be divided into Point level measurement and continuous quantity measurement. A wide variety of liquid level switches have caused many obstacles to the correct selection of users. For this reason, the common classifications of liquid level switches are introduced as follows. Hope to be helpful to instrument users.

Extended Reading: What is level transmitter working principle?

After the probe of the capacitive liquid level switch is exposed to liquid, it detects the change of the capacitance value and outputs the contact signal. Generally speaking, capacitive liquid level switches have certain advantages in the measurement of slightly viscous media.

Extended reading: Capacitance level sensor advantages and disadvantages

The electrode type liquid level switch mainly uses the conductivity of the liquid to detect the height of the liquid level. Once the measured medium touches the pole, it will conduct electricity and detect the signal. After the signal is amplified by the controller, it will output a contact signal to realize the control of the liquid level.

The magnetic float of the float level switch rises or falls with the liquid level so that the sensor detects the reed switch chip at the set position in the tube. It sends out contact on/off switch signal. Due to the simple structure of the float level switch, it is economical and practical. It is widely used in the civilian market. But compared with industrial-grade products, its stability is relatively poor.

Extended reading: Oil-water interface measurement-Magtech magnetic level indicator

The photoelectric liquid level switch mainly uses the principle of light refraction and reflection. It is detected by infrared rays. Because the light will reflect or refract at the interface of two different media. When the measured liquid is at a high level, the measured liquid and the photoelectric switch A kind of interface is formed. When the measured liquid is at a low position, the air and the photoelectric switch from another interface. These two interfaces make the reflected light intensity received by the light-receiving crystal inside the photoelectric switch different. That is to say, there are two corresponding interfaces. Different switch states. Generally speaking, the applicability of photoelectric switches is poor compared with other measuring instruments.

Extended reading: Non contact level measurement

**HS-ULC Ultrasonic Level Switch-External Mounted**

The instrument probe of the ultrasonic external liquid level switch emits ultrasonic waves and detects its after-vibration signal in the container wall. When the liquid flows over the probe, the amplitude of the after-vibration signal will become smaller. The instrument will output a signal after detecting the change Switch signal. Because the ultrasonic external liquid level switch is a non-contact measuring instrument, it is mostly used in the scene where it is not easy to open holes and high risk. But relatively speaking, its cost is relatively high.

Extended reading: The Secret of Ultrasonic Level Measurement

The tuning fork liquid level switch mainly outputs a switch signal by detecting the changes in the frequency and amplitude of the fork vibration. Its versatility is strong, but it is necessary to consult the manufacturer for working conditions with high viscosity. For working conditions that are easy to crystallize, it is not recommended.

Extended reading: Solid flow meter | For bulk solids-powder-soybean-cement

Featured Level switches for point level measurement

**HS-ULC-Pro Ultrasonic Non-contact Liquid Level Controller**

**Ultrasonic Oil Level Sensor-External Paste-Truck Fuel Tank**

**SI-LT Magnetostrictive level transmitter with Local Digital Display**

Extended reading: Ultrasonic Oil Level Sensor-External Paste-Truck Fuel Tank

Sino-Inst offers over 10 Point Level Measurement Sensors. About 50% of these are liquid level meters, 40% is the tank level sensor.

A wide variety of Point Level Measurement Sensors options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Point Level Measurement Sensors instrumentation, located in China.

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What does intrinsically safe mean?

Posted on September 1, 2021 by KimGuo11

Intrinsically safe type is an explosion-proof type of electrical equipment. When purchasing electrical equipment, do you often hear about intrinsic safety? For example, when ordering pressure transmitters or flow meters.

Intrinsically safe instruments are intrinsically safe instruments. Also called safety spark type instrument. It means that the instrument is in the normal state and in the fault state. The sparks generated by the circuit and the system and the temperature reached will not ignite the explosive mixture.

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What is intrinsically safe?

Intrinsically safe type is an explosion-proof type of electrical equipment. It limits the electric spark or thermal effect energy that may be generated by the inside of the equipment and the connecting wires exposed to the potentially explosive environment to a level that cannot produce ignition.

ia or ib or ic. ia is the highest and ic is the lowest. See GB3836.4-2010 for details.

By controlling the energy level of the equipment itself, it is lower than the critical condition for igniting explosive gas under normal working or fault conditions. It will not produce sparks or higher than the temperature of igniting explosive gas. It does not need to be shielded or blocked by other means.

By limiting the various parameters of the electrical equipment circuit, or taking protective measures to limit the spark discharge energy and thermal energy of the circuit, so that the electric spark and thermal effects generated under normal operation and specified fault conditions cannot ignite the explosive mixture in the surrounding environment. In this way, electrical explosion-proof is realized. The circuit of this kind of electrical equipment itself has explosion-proof performance. That is to say, it is “essentially” safe. So it is called intrinsically safe. Electrical equipment using intrinsically safe circuits is called intrinsically safe electrical equipment.

Because the circuit of intrinsically safe electrical equipment is inherently safe. The sparks, arcs, and heat generated will not ignite the explosive mixture in the surrounding environment. Therefore, intrinsically safe electrical equipment does not require special explosion-proof enclosures. This can reduce the size of the equipment. Volume and weight. Simplify the structure of the device.

At the same time, the transmission line of intrinsically safe electrical equipment can use glue lines and bare wires. It can save a lot of cables.

Therefore, intrinsically safe electrical equipment has the characteristics of safety and reliability, simple structure, small size, lightweight, low cost, convenient manufacturing, and maintenance, etc. It is an ideal explosion-proof electrical equipment.

However, since the maximum output power of intrinsically safe electrical equipment is about 25W, the range of use is limited.

Intrinsically safe electrical equipment is mainly used in communication, monitoring, signal, and control systems, as well as instruments and meters.

Extended reading: How To Install The Pressure Sensor When Measuring The Flow Pipeline?

What are the specifications and guidelines for intrinsic safety?

ATEX (Europe)

The European Union Directive 94/9/EC often referred to as ATEX (“Atmospheric Explosion”). It is the main European regulation for protection systems and equipment used in potentially explosive atmospheres.

The purpose is to serve as a unified directive to lay the foundation for the necessary health and safety requirements. Replace existing different national and European legislation.

The directive is mandatory for electrical and electronic equipment sold in Europe on July 1, 2003 and used in environments affected by explosion hazards.

The ATEX directive has now been adopted all over the world.

NEC (United States)

The National Electrical Code (NEC) is the basis for all electrical codes in the United States. NEC 500 and 505 cover the classification of hazardous areas and related product identification.
NEC 500 explained that it is a long-term regulation. It has been adopted all over the world, except in Europe. NEC 505 is similar to ATEX.

Intrinsically safe symbol

After evaluation, each approved intrinsic safety device should meet ATEX and NEC or Factory Manual standards. Through the corresponding grade system, you can know which areas, protection types, gas groups, and temperature grades the instrument has been approved for.

Example: Fluke 707ex conforms to ATEX II 2 G Ex ia IIC T4

–	The ATEX examination mark. This sign is required on all devices for use in European hazardous areas.
II 2 G	Regional classification. “II” indicates that the tool has been approved for use in all non-mining areas. “2” indicates the category of the device. In this example, the device is evaluated for use in a ** category* hazardous area. “G” designates the environment, in this case, gas, steam, and moist environment.
Ex	Explosion protection is based on European Ex regulations.
ia	Explosion protection type, in this case, the energy in the device or connector has been reduced to a safe value.
IIC	Gas group. The “IIC” grade indicates the suitability of the * hazardous gas group.
T4	The temperature category is the maximum temperature that may exist on the surface.
–	Example of Factory Mutual classification: Fluke 707ex is N.I.Class 1, Div 2, Groups A-D, T4 classified by FM.
–	The Factory Mutual approval mark.
N.I.	A non-flammable instrument with limited internal energy, so it will not ignite the specified environment during use.
Class I	Can be used with gas, steam, and liquid (except for dust, fiber, or filing).
Div 2	It is certified to be used in “Area 2”, and the explosive gas environment that does not usually exist may exist for a short time in rare cases.
Groups A-D	After evaluation, it can be used with explosive gases defined in Group A-D. These gases include acetylene, hydrogen, acetylene, and propane.

Definitions of Hazardous Areas

According to the frequency and duration of the explosive environment, the hazardous area is divided into different areas.
The gas field is divided into three areas: Zone 0, Zone 1, and Zone 2.

Zone 0	Places where the explosive mixture in an explosive environment continuously appears in the form of gas, vapor, or mist or exists for a long time.
Zone 1	During normal operation, a place where an explosive mixture in the form of gas, vapor, or mist may occur in an explosive environment. Zone 1 is a typical application place for explosion-proof electrical equipment.
Zone 2	During normal operation, it is unlikely that explosive mixtures in the form of gas, vapor, or mist will appear in an explosive environment, and if they occur, they will only occur occasionally and exist for a short time. Normally, “short time” means that the duration is not more than 2 hours.

The dust site is divided into three areas: Zone 20, Zone 21, and Zone 22:

Zone 20	During normal operation, combustible dust appears continuously or frequently, and its quantity is sufficient to form a mixture of combustible dust and air and/or may form an uncontrollable and extremely thick dust layer and inside the container.
Zone 21	During normal operation, there may be places where the amount of dust is sufficient to form a mixture of combustible dust and air but is not classified into Zone 20. This area includes places that are directly adjacent to filled or discharged dust, where dust layers appear and places where flammable concentrations of combustible dust and air mixture may be produced under normal operating conditions.
Zone 22	Under abnormal conditions, places where combustible dust clouds occasionally appear and only exist for a short period of time, or combustible dust occasionally accumulates or there may be a dust layer and generate combustible dust-air mixtures but are not classified into Zone 21. If it cannot be guaranteed to exclude combustible dust accumulation or dust layer, it should be divided into 21 zones.

Intrinsically safe certification

Intrinsically safe explosion-proof certification technology is currently standardized and suitable for zone 0 technology. For automation instruments, the most commonly used explosion-proof types are intrinsically safe, explosion-proof, and increased safety.

However, due to the rapid development of electronic technology and the continuous birth of low-power electronic devices. So that the promotion and application of intrinsically safe explosion-proof technology has a broader space. Especially because the intrinsically safe explosion-proof type is compared with other explosion-proof types. It not only has a simple structure but also has a wide range of applications. It also has the characteristics of easy operation and convenient maintenance. Therefore, this kind of intrinsically safe explosion-proof, which suppresses the ignition source energy as an explosion-proof method, has been accepted by instrument manufacturers and users.

Basic principles of intrinsically safe explosion-proof certification technology

Electric sparks and thermal effects are the main sources of ignition that cause explosive hazardous gas explosions. Intrinsic safety is achieved by limiting the energy of two possible ignition sources: electric spark and thermal effects.

Under normal working and fault conditions, when the energy of the electric spark or thermal effect that the meter may produce is less than this energy. It is impossible for the instrument to ignite explosive dangerous gas and cause an explosion.

The principle is to start with limiting energy. Reliably limit the voltage and current in the circuit to an allowable range. In order to ensure that the electric spark and thermal effects generated by the instrument in normal operation or short-circuit and component damage, etc., will not cause the explosion of dangerous gases that may exist around it.

Features of intrinsically safe explosion-proof certification technology

Intrinsically safe explosion-proof technology is actually a low-power design technology. Usually, for hydrogen (IIC) environment, the circuit power must be limited to about 1.3w.

It can be seen that intrinsically safe technology can be well applied to industrial automation instruments.

Compared with any other explosion-proof type. The use of intrinsically safe explosion-proof technology can bring the following technical and commercial features to industrial automation instruments:

No complicated design and manufacturing process is required. A bulky and heavy flameproof enclosure. Therefore, the intrinsically safe instrument has the characteristics of simple structure, small size, light weight and low cost. According to data, the cost ratio of establishing an intrinsically safe and flameproof switch transmission circuit is about 1:4.
Maintenance, calibration and replacement of some parts of the instrument can be carried out under electrified conditions.
High safety and reliability. The intrinsically safe instrument will not reduce the safety and reliability of the instrument due to the loss of the fastening bolts or the corrosion of the casing joint surface, scratches and other man-made reasons
Because intrinsically safe explosion-proof technology is a kind of “weak current” technology. Therefore, the use of intrinsically safe instruments can avoid the occurrence of electric shock accidents of on-site engineering and technical personnel.
Wide application range. Intrinsically safe technology is the only explosion-proof technology applicable to hazardous locations in Zone 0.
For simple devices like thermocouples. No special certification is required to access the intrinsically safe explosion-proof system.

In summary, for automated instruments, intrinsically safe explosion-proof technology is an ideal explosion-proof technology. It will also be widely used in the design of Fieldbus intelligent instruments and their systems.

Intrinsically safe vs explosion-proof

It is often necessary to use explosion-proof instruments in industrial sites. The general industrial explosion-proof instruments are mainly explosion-proof and intrinsically safe. So, how to understand the difference between them?

Choose the right intrinsically safe device for your application

Explosion Proof Pressure Transmitter

SIEP489 Explosion proof pressure Transmitter is a microprocessor-based high-performance transmitter. SIEP489 has flexible pressure calibration, push button configuration, and programmable using HART® Communication. We also supply industrial pressure sensors, and explosion proof differential pressure transmitter.

All our electronic pressure transducers can be offered with Explosion-proof. Select explosion-proof pressure transmitters with Ex d certification and 4-20mA output signals for installation. These installations require the use of equipment and enclosures designated as containing internal explosives. This prevents ignition of the explosive environment surrounding the equipment ( Specified) Flameproof area.

**SI-PCM261 Submersible Pressure Transducer**

**Extended Diaphragm Seal DP Level Transmitter**

Intrinsically Safe Flow Meter

When do I need to choose an explosion-proof or intrinsically safe flowmeter?

Please remember that when you need to measure the medium is flammable and explosive. Be sure to tell the flowmeter manufacturer. Choose intrinsically safe or explosion-proof flow meters.

For example, to measure diesel oil, turbine flowmeters are used. The explosion-proof model must be selected.
Another example is measuring hydrogen. Use vortex flowmeter. The intrinsically safe model must be selected.

Sino-Inst offers a variety of Intrinsically Safe vs Explosion Proof Pressure-Level-Flow Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.