The Metal Tube Rotameter uses the variable area measurement principle. The intelligent metal tube float flowmeter has a local display type and an intelligent remote transmission type, with the transmitter. Metal Tube Rotameter can be used to measure the flow of liquid, gas, and steam. It is especially suitable for medium flow measurement with a low flow rate and small flow.
Metal tube rotameter with the transmitter is also called digital rotameter. All-metal structure, there are indicator type, electric remote transmission type, corrosion-resistant type, high voltage type, jacket type, explosion-proof type.
Electric remote transmission, explosion-proof design. Explosion-proof mark Exd Ⅱ CT6. Optional HART protocol function. DC24V power supply, the on-site pointer indicates instantaneous flow. Digital display instantaneous and cumulative flow. Two-wire system 4~20mA output. There are 4 buttons on the panel to view and modify internal parameters.
Metal tube rotameter Features
Suitable for flow measurement of small-diameter and low-velocity media;
Reliable work. Low maintenance and long life;
The requirements for straight pipe sections are not high;
Wider flow ratio 10:1;
Two-line large LCD display. Optional on-site instantaneous/cumulative flow display. Single-axis sensitive indication with backlight;
Non-contact magnetic coupling transmission.
All metal structure, metal tube rotor flowmeter is suitable for high temperature, high pressure and strong corrosive media;
It can be used in flammable and explosive hazardous situations;
Optional two-wire system, battery, AC power supply mode;
Multi-parameter calibration function. With data recovery, data backup and power failure protection functions.
The metal tube float flowmeter is mainly composed of two parts: the measuring tube and the indicator. The measuring tube includes a conical tube or orifice, guide, stopper, float, and other components. The indicator includes a magnetic follower system, pointer, dial, circuit, and other components.
The measured medium flows through the measuring tube from bottom to top. The upper and lower ends of the float generate differential pressure to form a rising force. When the rising force of the float is greater than the weight of the float immersed in the flowing fluid, the float rises, and the annular gap area increases. Annular gap When the fluid velocity drops rapidly, the differential pressure at the upper and lower ends of the float decreases. The ascending force acting on the float decreases. Until the ascending force balances with the weight of the float immersed in the fluid, the float stabilizes at a certain position. The height of the float is that Corresponds to the size of the measured medium flow.
The float has built-in magnetic steel. When the float moves up and down with the medium, the magnetic field changes with the movement of the float.
a. For the in-situ type, the follow-up magnet in the in-situ indicator is coupled with the magnet in the float. It rotates and drives the pointer at the same time, and the current flow rate is indicated by the dial.
b. For the smart type, the follower magnetic steel in the smart indicator is coupled with the magnetic steel in the float. It rotates and drives the sensing magnetic steel and pointer at the same time. The magnetic field change is converted into an electrical signal through a magnetic sensor. A/D conversion, digital filtering, temperature compensation. Microprocessor processing, D/A output. LCD liquid crystal displays the instantaneous flow and cumulative flow.
Rotameter is a common type of flowmeter. The flowmeter is an industrial instrument for measuring the flow of liquids, gases, and other media. There are many types of flow meters. Such as electromagnetic flowmeter, turbine flowmeter, vortex flowmeter, and so on. Different flow meters have different measurement principles. For example, the electromagnetic flowmeter is based on the principle of electromagnetic induction. The rotameter is a device that estimates the flow rate by measuring the (position) of the rotating parts installed in the DC pipeline.
The flow detection element of the float flowmeter is composed of a vertical tapered tube that expands from bottom to top and a float group that moves up and down along the axis of the tapered tube. Below, I will give you a specific introduction to the classification of rotameters.
Glass rotameter:
Glass rotor flowmeters are mainly used in various departments such as the chemical industry, petroleum, light industry, medicine, fertilizer, chemical fiber, food, dyes, environmental protection, and scientific research. Used to measure the flow of single-phase non-pulsating (liquid or gas) fluids. The anti-corrosion glass rotor flowmeter is mainly used for the detection of corrosive liquid and gas medium flow. Such as strong acid, strong acid, oxidant, strong oxidizing acid, organic solvent, and other corrosive gas or liquid medium flow detection.
The main parts such as the liquid plastic tube rotameter cone tube are made of AS, ABS plastic. Has relatively good corrosion resistance. The product also has the characteristics of reasonable structure, small size, lightweight, and the tapered tube is not easily broken. The plastic tube rotor flowmeter can be widely used in chemical, environmental protection, food, and other industrial sectors.
Plexiglass rotameter:
Plexiglass rotameter is divided into panel type plexiglass rotameter and pipeline type plexiglass rotameter.
Plexiglass rotameter also has the characteristics of high transparency, intuitive reading, not easy to break, lightweight, long life, and convenient installation and connection. However, the tapered glass tube of plexiglass cannot be used for organic solvents (such as trichloroethylene, dichloroethane).
Metal tube rotameter:
Metal tube rotameter is divided into on-site pointer indication type and remote transmission type.
Metal float flowmeter is a kind of flow measuring instrument commonly used in industrial automation process control. It has the characteristics of small pressure loss, large detection range (range ratio 10:1), and convenient use. It can be used to measure the flow of liquid, gas, and steam. It is especially suitable for medium flow measurement with low flow velocity and small flow.
The metal float flowmeter has a local display type and an intelligent remote transmission type. With pointer display. Instantaneous flow, cumulative flow, liquid crystal display. Upper and lower limit alarm output. Cumulative pulse output, standard two-wire 4-20mA current output, and other forms. Provide users with a very wide choice of space. In addition, the instrument uses a high-quality MCU micro-processing system. Ensure the excellent performance of the flowmeter in various applications.
The metal shell has a built-in intelligent circuit board. Intrinsically safe explosion-proof structure design, explosion-proof mark iallCT5.
The indicator has both a separate mechanical pointer for instantaneous flow. There are also five liquid crystal digital display instantaneous flow and eight digital display cumulative flow. And equipped with button operation, human-computer interaction interface. It can also output 4-20MA current signal, upper and lower limit alarm and other signals.
Digital rotameters also have a variety of parameter calibration, setting functions, data backup, data recovery and power failure protection. In addition, when it is not a two-wire power supply mode, the LCD backlight display function is also selected.
A wide variety of Metal Tube Rotameter options are available to you, such as free samples, paid samples.
Sino-Inst is a globally recognized supplier and manufacturer of Rotameter flow meters, located in China.
The top supplying country is China (Mainland), which supply 100% of the Rotameter flow meter respectively.
Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Metal Tube Rotameter 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.
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.
Sulfuric acid storage tanks are mainly used to store sulfuric acid produced in acid production. The accuracy of the liquid level of the sulfuric acid storage tank is directly related to the continuity of production. Because the sulfuric acid storage tank stores 98% concentrated sulfuric acid. There will be Part of the acid mist will have a certain impact on the liquid level detection.
Because of the anti-corrosion and anti-disturbance problems, the traditional detection instruments are not suitable for detection. Only the radar liquid level sensor can achieve a relatively high measurement accuracy. It has the characteristics of high continuous measurement accuracy, non-contact type, large measurement range, and good anti-corrosion performance.
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 sensor 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 sensor 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.
The radar level sensor adopts an integrated design and has no moving parts. There is no mechanical wear and long service life;
The electromagnetic wave emitted by the radar liquid level sensor does not need a transmission medium. Not affected by the atmosphere, steam, and volatilized fog in the tank;
Can be used for high temperature and high-pressure liquid level measurement;
Strong corrosion resistance and can adapt to highly corrosive environments;
It has the function of false echo suppression. Suppress the false echo signal from the liquid surface to the antenna through false echo. Eliminate the interference of false echoes;
We have provided customers with radar level transmitters for level measurement in sulfuric acid tanks.
The diesel-sulfuric acid storage tank is a vertical storage tank. Because there is a large amount of volatile gas in the tank. Therefore, the equipment is required to be explosion-proof without being affected by the gas. Based on the internal structural characteristics of the pyrosulfuric acid storage tank and the characteristics of the storage medium. Our company chose a non-contact intelligent radar level transmitter to measure the level of the medium.
There are 6 sulfuric acid storage tanks, and the tanks can be connected. To ensure the accuracy and safety of the measurement. Radar level transmitters are installed on the 6 tanks respectively, which are on standby for each other. And under normal circumstances, the accuracy of the two liquid level measurement values can be compared by reference.
When installing the radar wave level transmitter, the inclined installation method was first adopted. Its inclination angle does not exceed 15°.
When debugging the level gauge, it is found that there is no level data display. Analyze the cause of the failure because the emitted radar wave is reflected back on the steel plate of the tank. The main reason is that the false echo interference is too large. After re-adjusting the installation angle of the radar level transmitter, it was found that level data appeared. However, the data fluctuates greatly, and due to analysis reasons may be due to liquid level fluctuations. Radar wave reflections cause effects.
For this reason, it was decided to install a reflector in the measuring tube in the tank. Readjust the installation of the radar level transmitter. Make the plane of the transmitting antenna of the radar wave parallel to the reflector. The level data measured in this way is more accurate.
Calculation of the area of the reflector: Adopt an intelligent radar liquid level transmitter. Its antenna size parameter DN80/3″ Beam angle a=10°, According to the formula Tan5°=W/2D, It can be calculated that W=900mm, Furthermore, the area of the reflector is obtained.
Therefore, we can make a disc with a diameter of not less than 900mm.
Connect the signal wire on the wiring terminal of the radar level transmitter to the safety barrier. That is, first pass the safety barrier and then connect to the I/0 card of the DCS and the SIS system. And complete the software configuration and the parameter setting of the radar level transmitter.
The change of the medium level of the storage tank can be monitored in real-time through the DCS system. And to realize the remote control of the storage tank level and the monitoring of real-time/historical data.
We generally encounter liquid level measurement in chemical plants such as petroleum storage tanks, chemical storage tanks, chemical storage tanks, sewage treatment plants, dosing tanks, seasides, and docks. Used to measure corrosive media such as sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid, sodium hydroxide, and concentrated alkali.
When encountering these corrosive media, we generally choose corrosive ultrasonic level sensors and use non-contact radar level sensors to measure corrosive liquids such as sulfuric acid, hydrochloric acid, and nitric acid. Below we introduce, we have to consider two major principles in the selection of level sensor measurement.
The first principle: the principle of non-contact measurement needs to be considered. Choose a non-contact level sensor.
Because the probe of the level sensor does not need to touch the medium. The principle of the sensing band is used to obtain the current liquid level information. For example, when the radar level sensor measures the level, it does not touch the measured medium. The selected material is tetrafluoroethylene. At the same time, it is a fully enclosed anti-corrosion structure. Therefore, the effect is very good for the liquid level measurement of viscous, corrosive, turbid, and other liquids.
The second principle: to consider the convenience of on-site installation.
Due to the uniqueness of the measurement of corrosive liquids such as sulfuric acid, hydrochloric acid, and nitric acid. It needs to be easily installed on-site. It needs to be simple to open a hole in the jar.
Therefore, in the selection process of the level sensor, it is necessary to consider the characteristics of reliable work, easy installation, long service life, and maintenance-free.
The third principle: sensor selection.
When the radar level sensor measures corrosive media, the general manufacturers will choose the anti-corrosion type tetrafluoro material contact surface. Considering environmental factors, a physically sealed anti-corrosion probe should be selected for this occasion.
The fourth principle: the choice of the host part.
For the most part, good sealing is required. As long as there is a little leakage of the medium. It is possible to enter the inside of the level sensor from the housing or the wire inlet. As a result, the internal circuit board is corroded. For corrosive gases in the environment, anti-corrosion high-frequency radar level sensors can be used to protect the service life of the host.
The above is how we analyzed how to choose a level sensor for concentrated sulfuric acid and hydrochloric acid. If concentrated sulfuric acid and hydrochloric acid exceed a certain temperature range, and steam or vaporization occurs, it is necessary to consider the actual situation on-site and re-select the appropriate level sensor.
From the working principle of ultrasonic level transmitter and radar level transmitter, we can see that the two have many similar parts. There is little difference in sulfuric acid corrosion resistance. This is also an important reason why many meter users do not know how to choose.
Both dilute sulfuric acid and concentrated sulfuric acid have acid mist and are volatile. Moreover, when the sulfuric acid pump is running, foams of different degrees will be generated on the surface of the sulfuric acid. These factors will affect the accuracy of the sound velocity measurement of the ultrasonic liquid level transmitter. In this regard, feedback results from a large number of user applications show that in measuring the level of sulfuric acid, both domestic and foreign ultrasonic level transmitters are not ideal.
Because the electromagnetic wave of the radar level transmitter is less affected by factors such as gas, foam, and dust. Therefore, radar level transmitters, especially high-frequency radar level transmitters, can be better used for sulfuric acid level measurement.
In comparison, the measurement of the radar level transmitter is more accurate. Therefore, the radar level transmitter is more suitable for the level measurement of sulfuric acid than the ultrasonic level transmitter.
In specific practice, although the radar level transmitter is effective in measuring the level of sulfuric acid. But in the measurement of the sulfuric acid level in the first suction tank, the sulfuric acid level in the second suction tank, and the sulfuric acid level in the underground tank. Anti-corrosion float level transmitters are widely used. This is because the price of radar-level transmitters is relatively expensive. The anti-corrosion float level transmitter is more cost-effective.
But in terms of measuring the level of sulfuric acid storage tanks. Few sulfuric acid plants use anticorrosive float level transmitters. This is because the anti-corrosion float level transmitter is under the impact of liquid from a higher tank. The guide rod is prone to bend. It is not suitable for use in sulfuric acid storage tanks. Most sulfuric acid plants use radar level transmitters for sulfuric acid level measurement.
Sino-Inst is a manufacturer of Radar level sensor for Sulfuric acid storage tank level measurement. Sino-Inst offers over 30 Radar level sensors for level measurement. About 50% of these are used as oil level meters, 30% is the Sulfuric acid storage tank level meter. A wide variety of Radar level sensor options are available to you, such as free samples, paid samples.
Sino-Instrument is a globally recognized supplier and manufacturer of Sulfuric acid storage tank level measurement instrumentation, located in China.
Sulfuric acid storage tank level measurement instruments are most popular in North America, Domestic Market, and South America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and ISO14001 certification.
Sino-Inst’s entire team is well trained, so we can ensure that each customer’s needs are met. If you need any help with your product requirements, whether it is a radar level sensor, pressure sensor, or other equipment, please give us a call.
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.
Radar level transmitter and Ultrasonic level transmitter are both liquid level measuring instruments. The most obvious difference is that one uses electromagnetic waves and the other uses ultrasonic waves. So, besides that, what is the difference between a Radar level transmitter and an Ultrasonic level transmitter?
List of Differences: Radar vs Ultrasonic Level Measurement
Here, we first list the main differences between radar level gauges and ultrasonic level gauges. You can get answers directly and clearly.
The radar level gauge uses the microwave generated by the radar to complete the measurement work. Ultrasound is realized in the form of sound waves. This is also the essential difference between the two.
The temperature of the measuring medium is different. The temperature of the medium measured by the ultrasonic level gauge does not exceed 80°C. The radar level gauge is different, the medium temperature can be as high as 1200 ℃.
The operating conditions and environments are different. There are many styles of radar level gauges, such as: horn type, drop type, rod type, etc., so it can be applied to different working conditions. Ultrasonic liquid level gauges cannot be used in working conditions such as vacuum and corrosion-resistant liquids.
Accuracy and range are different. The accuracy of radar level gauge is much higher than that of ultrasonic level gauge. The range of the radar level gauge can reach 0-100M, and the range of the ultrasonic level gauge is only 0-30M.
This is about the price. Relatively speaking, the radar level gauge has a wide range of applications and a high temperature measurement medium. The price is also understandable. If the ultrasonic level gauge can meet the demand, it can also be selected.
The above 5 points have briefly summarized the differences between radar liquid level measurement and ultrasonic liquid level measurement.
Therefore, when we purchase, which instrument to choose as our measuring instrument should be combined with the conditions of our measured medium before making a choice. Don’t choose blindly.
If you want to continue to understand the details of Radar vs Ultrasonic Level Measurement, then please read on.
Ultrasonic technology is not only used to measure level, but also can be used to measure depth. Get more.
Ultrasonic VS Radar level transmitter – working principle
Radar level transmitter
Radar level transmitter adopts the circuit design of a high-frequency microstrip line structure, and the internal circuit generates a 25GHz microwave pulse signal. 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 can be calculated. Then calculate the distance from the antenna to the surface of the measured medium.
An ultrasonic level transmitter is a digital level meter controlled by a microprocessor. In the measurement, pulsed ultrasonic waves are 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. Due to 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.
From the above two principles, we can see the following two differences:
Radar level transmitter emits electromagnetic waves. The wave speed has nothing to do with ambient temperature, smoke, pressure, etc. It’s the same even in a vacuum. The propagation speed is always the speed of light.
Ultrasonic level transmitter emits ultrasonic waves, which are mechanical waves. Like sound waves, its propagation speed is closely related to the state of the propagation medium. Ultrasonic level gauges are used to measure the liquid level of atmospheric vessels. The probe contains a temperature measuring element that can compensate the temperature of the wave velocity. Because of the material. The temperature range used is relatively not very wide.
Ultrasonic VS Radar level transmitter – transmission method components are different
For example, ultrasonic waves are emitted by the vibration of piezoelectric materials. So Ultrasonic level transmitter cannot be used in high pressure or negative pressure occasions. Generally only used in atmospheric pressure vessels. The Radar level transmitter can be used in high-pressure process tanks.
The launch angle of radar is larger than that of ultrasonic. Non-contact radar is not recommended for small containers or elongated containers. Guided wave radar is generally recommended. Finally, there is the question of accuracy. Of course, the accuracy of radar is definitely higher than that of ultrasound. The high-precision radar must be used on the storage tank instead of ultrasonic. In terms of price, compared with an Ultrasonic level transmitter, the price of a Radar level transmitter is relatively high. Of course, the price of some large-scale ultrasounds is not low. Such as the range of 6 to 70 meters. The Radar level transmitter can’t reach a very large range. Only an Ultrasonic level transmitter can be selected.
Ultrasonic VS Radar level transmitter-different applications
The different working principles result in a big difference between the applications of Radar level transmitters and Ultrasonic level transmitters. It is specifically manifested in the following aspects:
Because the Radar level transmitter uses electromagnetic waves. It is greatly affected by the dielectric constant of the measured substance. The ultrasonic wave used in the Ultrasonic level transmitter is a mechanical wave. Mainly affected by the density of the measured medium. Therefore, when the dielectric constant of the measured substance is very low, Ultrasonic level transmitter should be used for measurement instead of Radar level transmitter.
The measurement range of Ultrasonic level transmitter is not as large as Radar level transmitter. Radar emits electromagnetic waves, which can be measured without the aid of a propagation medium. Ultrasonic waves are sound waves and mechanical waves, which need to be propagated by means of a propagation medium. Therefore, the ultrasonic level gauge has many limitations in the application process:
(1) Ultrasonic level transmitter cannot be used in working conditions such as vacuum, high steam content or foam on the liquid surface.
(2) Ultrasonic level transmitter has temperature and pressure limitations. The temperature at the probe of the Ultrasonic level transmitter generally cannot exceed 80 degrees, and the speed of the sound wave is greatly affected by temperature. Ultrasonic level transmitter is greatly affected by pressure, generally within 0.3MPa. Because sound waves are generated by vibration, the sound-producing parts will be affected when the pressure is too high. Extended Reading: GWR Level Sensor for High Temperature & High Pressure
(3) Ultrasonic level transmitters cannot measure well when there is a lot of fog or dust in the measurement environment. More about Top 5 Ultrasonic Level Sensor Applications.
In contrast, because the radar is an electromagnetic wave, it is not affected by vacuum. The applicable range of medium-temperature and pressure is also very wide. With the advent of high-frequency radar. Its application range is even wider. Under the same conditions, the Ultrasonic level transmitter is more limited.
The pressure occasions of the two applications are different. Because of the different transmission methods of radar and ultrasonic components. For example, ultrasonic waves are emitted by the vibration of piezoelectric materials. So Ultrasonic level transmitter cannot be used in high pressure or negative pressure occasions. Generally only used in atmospheric pressure vessels. The Radar level transmitter can be used in high-pressure process tanks.
Radar level transmitter has horn type, pole type, cable type, etc. to choose from. Can be applied to different measurement occasions. Compared with ultrasonic level gauges, Radar level transmitters can be used in more complex working conditions.
The launch angle of radar is larger than that of ultrasonic. Non-contact radar is not recommended for small containers or elongated containers. Guided wave radar is generally recommended. Finally, there is the issue of accuracy. Of course, the accuracy of radar is higher than that of ultrasound. The high-precision radar must be used on the storage tank instead of ultrasonic.
In terms of price, Radar level transmitter is more expensive than Ultrasonic level transmitter. Of course, some large-range Ultrasonic level transmitters are expensive. The Radar level transmitter can’t reach the very large range, so you can only choose the ltrasonic level transmitter.
However, whether it is a Radar level transmitter or an ultrasonic level transmitter, you must pay attention to the installation location and blind spots during the installation process. For example, when installing on the tank, do not install it near the feed inlet and the human ladder. At the same time, keep a distance of 300 to 500mm from the tank wall to prevent echo interference. When there is agitation and the liquid level fluctuates greatly, a suitable installation method should also be selected.
Oil Level measurements are necessary to control the amount of oil in the tank and to…
Our conclusions:
We cannot say that the radar level meter must be better than the ultrasonic level meter.
Both radar level meter and ultrasonic level meter can be better used for liquid level measurement.
But which level meter should be used in practical application? It should be determined according to the process conditions, medium characteristics, combined with installation conditions, use environment and other factors. Read more about: Ultrasonic Level Sensors for Liquids Applications
Sino-Inst has been committed to providing customers with liquid level and material level measurement solutions for many years. Experience. We supply ultrasonic level meter, explosion-proof ultrasonic level meter, radar level meter, hydrostatic pressure level meter, etc.
If you need to choose between the two. Then we must sort out the measurement conditions first, and then choose the appropriate level meter. You can also consult our sales engineers.
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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.
The solid flow meter is suitable for the measurement of solid mass flow in a wide range of metal-enclosed pipelines from kg/h to t/h. The system is suitable for online monitoring of the flow of solids such as powder, dust, pellets, granules, etc., which are pneumatically conveyed or in free fall (1nm-20mm). Solid flow meters are also called solid powder flow meters, intelligent electrostatic powder flow meters, solid dust flow meters, coal powder flow meters, mineral powder flow meters, lime flow meters, cement flow meters, flour flow meters, petroleum coke powder flow meters.
Sino-Inst supplies GTL/C powder flow meter. The intelligent electrostatic powder flow meter continuously measures bulk solid materials in a process. The ring sensor is used. It is suitable for the measurement of solid mass flow in a wide range of metal-enclosed pipelines from kgh to th. The system is suitable for online monitoring of solid flow such as powder and dust conveyed by pipeline pneumatic conveying. Also known as pipeline solid flowmeter, solid powder flowmeter, intelligent electrostatic powder flowmeter, solid dust flowmeter, microwave solid flowmeter, etc. Applicable to: coal powder, mineral powder, lime, cement, flour, petroleum coke powder, etc.
The Solid Flow Meter is based on the theory of contact electrification of solid materials.
The powder will accumulate a certain degree of electric charge during the pneumatic conveying process. This phenomenon is caused by the continuous collision, friction, and separation process between the powder particles and the particles, and between the particles and the tube wall.
The sensor part of the Solid Flow Meter is composed of a short stainless steel tube, a ring electrode, and an insulating layer. The two ends of the short tube are connected to the pipeline through a flange. The grounded metal tube wall plays an electromagnetic shielding role.
When the charged particles pass through the measuring pipe section, based on electrostatic induction, the sensor senses the charge number of the charged particles. The front-end circuit is connected to the sensor and the signal is amplified. Then it is calculated and processed by a converter with a high-speed central processing unit core. The flow rate is calculated and processed. The signal is converted into a standard current signal linearly related to the powder flow rate. It is used for flow control and adjustment.
Activated carbon flow detection of waste incineration power generation in power plants;
Limestone powder flow measurement during pneumatic conveying;
Sodium phosphate flow monitoring;
Blast furnace coal injection flow detection.
Application industry: Chemical, chemical fiber, glass manufacturing plants, food, papermaking, mining and metallurgy, environmental protection, steel, power stations, petroleum, cement manufacturing, and other industrial fields. It is used to measure the volumetric flow of various small particles such as coal powder, mineral powder, lime, cement, flour, petroleum coke powder. etc.
The Solid Flow Meter is based on the theory of contact electrification of solid materials. The powder material will accumulate a certain degree of electric charge during the process of pneumatic conveying or free fall.
Solid Flow Meter uses today’s advanced ring sensor. It can effectively capture every charged powder particle signal that passes through the ring sensor. It is amplified, shaped, and filtered by an amplifier circuit, and then processed by a high-speed processor. The final output is linear with the powder flow The standard current signal of the relationship.
The GTL/C powder flow meter is suitable for the measurement of solid mass flow in metal-enclosed pipelines with a wide range from kg/h to t/h. The system is suitable for online monitoring of the flow of solids such as powder and dust conveyed by pneumatic conveying. It can be widely used in electric power, metallurgy, cement, pharmaceutical, chemical, food manufacturing, and other industries.
Solid Flow Meter Selection Guide
When looking for a solid flow meter suitable for your process, Sino-Inst recommends that you make the best choice based on the following conditions:
Maximum flow
Material particle size
Material temperature
Bulk density/bulk density
After finding a solid flow meter suitable for your process according to the application conditions and material characteristics, you should also consider the following influencing factors:
Wear: Wear will affect the life of the measuring piece. It is worth noting that changes in material flow will also cause significant wear.
Adhesion: Materials should not adhere or accumulate on the surface of the measuring piece, as this will cause calibration deviations due to the buffering effect of adhered or accumulated materials.
Corrosive: Corrosive materials will damage the flowmeter components. Corrosive gases are also worth noting.
Airflow: Unstable and unpredictable airflow will affect the accuracy of airflow.
Unsteady material flow: For uneven material flow, please choose a displacement sensor type solid flowmeter. Because the displacement sensor type solid flowmeter has the characteristics of mechanical hydraulic buffering.
Selection of the capacity of solid flowmeter draft tube:
Sino-Inst prompts you to select the diameter of the draft tube. Regardless of any angle, the material must not exceed 1/2 the filling height of the draft tube.
Impact Plate Solid Flow Meter is used for metering equipment for powdery and granular materials with strong fluidity. Mainly suitable for closed material flow. Installation is restricted. Other occasions where similar products cannot be adapted. It is widely used in building materials, cement, chemical industry, coal, mining, ceramics, glass, metallurgy, grain, fertilizer, feed, port, electric power, coking, environmental protection and other industries.
All-steel frame structure, with sufficient rigidity and strength.
The special measuring chute is used to ensure wear resistance, non-sticking of materials, and measurement accuracy
Adopting high-precision digital weighing module, digital transmission technology, with simple circuit, no adjustment and section parts, high resolution, no signal attenuation, and strong anti-interference.
The controller adopts touch display technology, Chinese and English graphical display, guided operation mode, simple operation, no need to remember.
It can be connected to 485 communication, CAN communication, DCS, PLC and other interfaces.
GPRS wireless data transmission function is adopted, which can provide functions such as short message report, remote diagnosis, and scale calibration.
Measuring accuracy: ≤±1%
Feeding capacity: 2-1000T/H
Power supply: 220V/AC±15%, 50Hz±2%
Use environment: Scale body: –45~60℃ Control cabinet: 0℃~45℃
Relative humidity: ≤90%
The solid flow meter sends the measured material flow signal to the microprocessor control system. Automatically calculate the instantaneous flow of materials and the cumulative output of materials. The microprocessor controller constantly compares the actual flow with the set flow. And control the position or speed of the pre-feeding device. So as to change the feed-forward quantity of the material. In order to achieve the purpose of constant feeding.
The function of the calibration chamber is to perform irregular calibration on the feeding part. The feeding part is constantly corrected for errors. To ensure the accuracy of feeding.
The microwave solid flow meter uses the latest microwave technology. It is suitable for the measurement of solids in metal pipes. Online flow measurement. All powder, dust, crumbs, and particulate matter can be measured repeatedly. The measurement range is as small as kilograms per hour and as large as tons per hour. A microwave solid flowmeter is suitable for online measurement during pneumatic conveying or free fall. Therefore, it is an alternative product of a cost-effective weighing system. MONITOR level monitor and display can be used on various occasions to detect the flow/non-flow state of powder and solid particles. Choose SFD-2 solid level monitor or SFI solid level display. Mainly based on the output type (relay or analog Quantity) requirements.
The microwave solid flowmeter uses a 24GH high-frequency microwave. Through the coupling of the electromagnetic field between the sensor and the pipeline, a measurement field is generated. When the detected medium passes through the microwave detection field, the sensor transmits low-power microwaves and receives the energy reflected by the object. There is a frequency difference between the received microwave reflection frequency and the transmission frequency. A low-frequency AC voltage is generated at the output end. That is, the microwave sensor detects the quantity and flow rate of the moving medium. The microwave energy of the measuring field is reflected by the solid particles and received by the receiver. According to the Doppler principle, only the flowing particles can be measured by the microwave solid flowmeter. The flow rate (mass) can be calculated by combining the number and state of the particles recorded.
Non-contact mass flow online measurement
Compact structure and no need for armor protection
Easy, fast and cost-effective installation and start-up
Adjustable sensitivity
With RS485-interface can be connected to the system
The most advanced microwave technology
Robust and durable stainless steel housing
Wearable
Maintenance-free
The following are the main features of the microwave solid flow meter 17-8511-11:
Non-plug-in quick installation, no direct contact with the measured medium
SFD-2 can provide relay output and convenient electronic remote control
SFI solid flow display provides adjustable analog signal
Has passed CSA CLASS II, DIVISION I certification for use in hazardous situations
Suitable for pneumatic conveying device and free fall conveying process
Suitable for all solid materials, ranging from several kg/h to several t/h
No need for armor protection inside the tube, internal fittings are flush assembled
Non-contact measurement, not affected by temperature, pressure, and vibration
Very fast measurement speed, good static repeatability
Static particles such as sediments have no effect on this
Sensor-transmitter distance up to 2,000 meters
Limit alarm monitoring, with alarm contact
Highly sensitive type MF3000-S suitable for very small flow
MF3000-D suitable for high pressure
Suitable for ATEX area type 20 and type 2
Coal injection in iron-making blast furnaces and coal injection in power plant boilers (the instantaneous pulverized coal concentration of the coal injection main pipe and each branch pipeline can be monitored online, and the working status of each tuyere can be judged.
Monitoring of soot emission concentration of various fuel boilers
Widely used in various industrial applications, including: steelmaking, power generation, petroleum, chemical, pharmaceutical, building materials processing, coal mining and mining, cement manufacturing and packaging industries.
It can detect all dusty objects, such as sand, gypsum, wood chips/craft wood chips, cement, coal ye/brown coke powder, flour, calcium carbonate powder, talcum powder, crushed stone, lime powder, limestone powder…
A microwave solid flow meter monitors the blockage of a part of the transportation line or the entire line. Monitors the bridging status of the upstream medium in the storage tank. Monitors the inappropriate or inadequate flow of the medium due to the failure of the upstream equipment. Monitors the flow state of the medium. Control Start/stop of equipment. Control downstream processes.
What is a Grease Flow Meter? Grease Flow meters are meters dedicated to measuring the…
Sino-Inst offers over 50 flow meter for flow measurement. About 50% of these are differential pressure flow meters, 40% is the liquid flow sensor, and 20% are Ultrasonic Level Transmitter and mass flow meter.
A wide variety of flow meters options are available to you, such as free samples, paid samples.
Sino-Instrument is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.
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.
Differential pressure flow meters can measure all single-phase fluids. It can measure liquid, gas, and steam. Such as gas-solid, gas-liquid, liquid-solid, etc. can also be applied.
The calculation work in the use and maintenance of the differential pressure flow meter is indispensable for the instrument person. In this article, Sino-Inst shares the commonly used flow calculation formulas and calculation examples of differential pressure flowmeters. Mastering these technologies will have a multiplier effect on the use of differential pressure flow meters.
The differential pressure flow meter consists of a primary device and a secondary device.
The primary device is called the flow measuring element. It is installed in the pipeline of the fluid to be measured. It produces a pressure difference proportional to the flow (velocity). It is used for the secondary device to display the flow.
The secondary device is called a display instrument. It receives the differential pressure signal generated by the measuring element and converts it into the corresponding flow rate for display. The primary device of the differential pressure flow meter is often a throttling device or a dynamic pressure measuring device (pitot tube, velocity tube, etc.).
The secondary device is a variety of mechanical, electronic, and combined differential pressure meters equipped with flow display instruments. The differential pressure-sensitive components of differential pressure meters are mostly elastic components.
Since the differential pressure and the flow have a square root relationship, the flow display instruments are equipped with a square root device to linearize the flow scale.
Most meters are also equipped with flow totalizers to display the cumulative flow for economic accounting. This method of using differential pressure to measure flow has a long history and is relatively mature. Countries around the world are generally used on more important occasions. It accounts for about 70% of various flow measurement methods.
The advantages of throttling differential pressure flow meter:
The structure is simple, firm, stable, and reliable, long service life, and low price.
The measurement accuracy can reach +-1~2%.
It can be applied to high temperature and high-pressure occasions.
There are large-caliber products.
The throttling differential pressure flow meter makes the fluid lose its ideal state in throttling. The disadvantages are as follows:
The narrower 1:3 range ratio is only suitable for the occasions where the steam consumption of heating network users is relatively stable.
Longer front and rear straight pipe sections are required for installation to ensure a stable pipe flow at the inlet end of the throttle, which is generally difficult to meet.
The pressure loss of the orifice plate and nozzle is large.
There are too many factors that affect the measurement accuracy, from design, manufacturing to installation, the requirements are strict. Any link that does not meet the requirements of the standard documents will bring about greater measurement errors.
The biggest disadvantage of the throttling flow meter is that it requires a long straight pipe section to obtain higher accuracy, and it has greater limitations in practical applications.
The differential pressure of a differential pressure flow meter is proportional to the square of the flow, or the flow is proportional to the square root of the differential pressure. Expressed by the following formula:
The scale unit of the flow meter is the flow percentage, and when the lower limit range of the differential pressure is 0, we get:
In the above formula: △P is any differential pressure; Q is any flow; △Pmax is the upper limit of differential pressure; Qmax is the upper limit of flow; n is any percentage of flow
The range of a certain differential pressure transmitter is 0-40kPa. The corresponding flow rate is 0-1603/h. The output signal is 4-20mA. What is the flow rate when the output current of the differential pressure transmitter is 8mA? What is the differential pressure?
Solution:
①Calculate the flow rate of the differential pressure flow meter according to the flow calculation formula
When the output is 8mA, the flow rate is 80m3/h.
②When the differential pressure transmitter is known to output 8mA. The flow rate is 80m3/h. The flow rate is 50% of full scale. Calculate the differential pressure value of the differential pressure transmitter according to the flow calculation formula
When the output current is 8mA, the differential pressure is 10kPa.
Calculation formula 2: Conversion of volume flow in standard state and working state
The conversion formula of volume flow between standard state and working state is as follows:
In the formula,
qv is the volumetric flow rate under working conditions, in m3/h; qn is the volume flow under standard conditions, in m3/h; P is the absolute pressure under working conditions, the unit is Pa; Pn is the absolute pressure in the standard state, in Pa; T is the thermodynamic temperature under working conditions, in K; Tn is the thermodynamic temperature in the standard state, in K; Z is the gas compression coefficient under working conditions; Zn is the gas compressibility coefficient under standard conditions;
The design range of an airflow meter is 0-2000m3/h (at 20℃, 101.325kPa state). The pressure under working conditions is 0.5MPa. The temperature is 60°C. Find the volume flow under working conditions.
Solution: Substitute the data into the formula to calculate the volume flow under working conditions
The volume flow range of this flow meter is 0-460m3/h under working conditions.
Calculation formula 3: Calculation of changing range of standard orifice plate
Sometimes it is encountered in the field that the measured flow exceeds the maximum range of the orifice plate, or the flow is too small and can only be displayed below 30% of the maximum range. The emergency can be met by expanding or reducing the differential pressure range. The basis for changing the range is the formula. The maximum differential pressure and maximum flow rate of the flow meter in use are known. With these two parameters combined with the flow calculation formula, the calculation work for changing the range can be carried out.
There is an orifice flow meter, the original design differential pressure range is 0-60kPa. The flow range is 0-10000kg/h. The process flow of the expansion of production scale has exceeded the maximum flow of the orifice, and the range is planned to be expanded to 0-15000kg/h.
Solution: Calculate the corresponding maximum differential pressure according to the formula
The differential pressure value simply calculated above will have a certain error and is not a trade settlement. It can be used in general production sites. Uncertainty will not be a problem, but the pressure loss will increase. When changing the range of the orifice plate, the influence of many parameter changes should be considered comprehensively, and the iterative calculation method should be selected for the formal.
What is the difference between iterative calculation and simple calculation? The following is a comparative example
The original maximum flow rate of a certain steam flow meter was 70,000 kg/h, and the maximum differential pressure was 100 kPa. Because the actual flow is too small, the proposed maximum flow is 35000kg/h. The result of iterative calculation by computer is 35000kg/h, and the corresponding maximum differential pressure is 24.837kPa.
Solution: According to the formula, use a simple method to calculate the maximum differential pressure corresponding to 35000kg/h as 25kPa
If the result of the iterative calculation is taken as the standard value, the error of the simple calculation is:
Compared with the two methods, the error generated by the simple calculation method is 0.656%. Many production sites are still acceptable, especially for emergencies. Because the replacement of the orifice plate needs to be ordered and stopped. In order to reduce errors, some parameters (such as outflow coefficient, expansion coefficient, fluid density, etc.) can be indirectly corrected in the flow totalizer or DCS.
Change the range of the standard orifice plate by yourself, and first calculate it according to the flow calculation formula. Then set the range of the differential pressure transmitter according to the calculation result and calibrate it. Set the new parameters of the flow totalizer and DCS, then it can be put into use.
Changing the range of the orifice plate by yourself is restricted by conditions, that is, the newly changed range cannot exceed the 3:1 adjustable range of the standard orifice plate. The iterative calculation method is used when conditions permit. Or redesign the orifice plate.
Sino-Inst, Manufacturer for differential pressure flow meter. Including an Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement.
Sino-Inst’s differential pressure flow meters, made in China, Having good Quality, With a better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.
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.
A sludge flow meter refers to a flow meter that can be used to measure the flow of sludge.
What kind of flowmeter can be used for sludge flow measurement?
According to the characteristics of the sludge medium, the flow rate of the sludge can be measured by using an electromagnetic flowmeter. The electrode material uses a tantalum electrode. The lining material uses a ceramic material or tetrafluoroethylene. This can solve the flow measurement condition of the sludge.
Sludge treatment (sludge treatment) refers to the reduction, stabilization, and harmless processing of sludge such as thickening, tempering, dewatering, stabilization, drying, or incineration. The higher the degree of sewage treatment, the more sludge residues that need to be treated.
The main reason for using an electromagnetic flowmeter to solve the flow of sludge is its low cost, high measurement accuracy, and good stability. Many flows measuring instruments can meet this requirement.
The wastewater treatment plant uses a secondary treatment process called activated sludge. This process converts non-sedimentable substances into biological flocs. This substance is produced in the aeration tank and settled in the final sedimentation tank.
Activated sludge is an aerobic process. It can promote the health of microorganisms and ensure effective treatment. The balance between food and oxygen and microorganisms must be maintained for optimal treatment. An element of maintaining biomass is to return a part of the sedimentation sludge from the final sedimentation tank to the aeration tank to maintain the balance of the biological system. This part of activated sludge is called RAS (Returned Activated Sludge).
The RAS is returned to the aeration tank via a variable-speed centrifugal pump. Accurate flow rate measurement is essential to ensure that the proper ratio of “food to microorganisms” is maintained. The RAS flow rate is determined by a microbiological health laboratory analysis, and the flow rate is adjusted accordingly.
Sludge Flow Measurement of Return Activated Sludge Pipe
1 Project background
DN 400mm stainless steel pipe;
Full tube
High pollution load, suspended solids content as high as 1%.
2 Measurement requirements
Trouble-free and stable measurement of the horizontal conveying pipe of the return sludge conveyed by the screw pump lifting equipment;
Due to high pollution load and gas load. The two existing measurements. Electromagnetic flowmeter + external clamp ultrasonic time difference method. Neither can work reliably or at all;
The installation cost is low.
3 Solution
Use NFP type cross-correlation flow measurement system;
A hole was drilled upstream of the existing electromagnetic flowmeter. The NFP mounting piece was welded to the existing pipeline;
Install a ball valve that can remove the sensor during operation, adjust and fix the cross-correlation sensor.
4 Advantages
Simple and fast upgrade and transformation of existing facilities;
The old flow measurement equipment does not necessarily need to be dismantled;
Although the concentration of suspended solids in the water is high, the flow measurement is still reliable.
Advantages of electromagnetic flowmeter in sludge measurement
The electromagnetic flowmeter has no mechanical inertia. Responsive. Can measure instantaneous pulsating flow. It can also measure the flow in both directions.
The output of the electromagnetic flowmeter is only proportional to the average flow rate of the measured medium. It has nothing to do with the flow state (laminar or turbulent) under symmetrical distribution. Therefore, the electromagnetic flowmeter has a very wide range. The measurement range can reach 100:1, and some even reach the operable flow range of 1000:1.
The sensor structure of the electromagnetic flowmeter is simple. There are no moving parts in the measuring tube, nor any throttling parts that hinder fluid flow. So when the fluid passes through the flow meter, it will not cause any additional pressure loss. It is one of the flow meters with low energy consumption in the flowmeter.
The industrial electromagnetic flowmeter has a very wide caliber range. From a few millimeters to a few meters. Moreover, there are real-flow calibration equipment with a diameter of 3m in China. Laid a foundation for the application and development of electromagnetic flowmeters.
The electromagnetic flowmeter is a volume flow measuring instrument. During the measurement process, it is not affected by the temperature, viscosity, density and conductivity (in a certain range) of the measured medium. Therefore, the electromagnetic flowmeter only needs to be calibrated by water. It can be used to measure the flow of other conductive liquids.
It can measure the flow of dirty medium, corrosive medium and suspended liquid-solid two-phase flow. This is because there are no obstructing flow parts inside the meter measuring tube. The fluid to be measured is only in contact with the inner lining of the measuring tube and the electrode, and the material can be selected according to the nature of the fluid to be measured.
For example, use polytrifluoroethylene or polytetrafluoroethylene as the lining. It can measure various corrosive media such as acid, alkali and salt. The use of wear-resistant rubber as the inner lining is particularly suitable for measuring liquid-solid two-phase flows such as mineral slurry and cement slurry with solid particles and greater wear, as well as various suspended liquids such as fiber-containing liquids and pulps.
Can electromagnetic flowmeter measure sludge fluid with 85% moisture content?
Yes, there is no problem at all. I am the technology of the electromagnetic flowmeter manufacturer, and the measurement is no problem. It is only when the density of the sediment particles reaches a certain level. There will be peak fluctuations. However, the measurement is no problem.
Which lining material electromagnetic flowmeter is used for sludge flow meter?
What kind of flowmeter can be used for sludge flow measurement. According to the characteristics of the sludge medium, the flow rate of the sludge can be measured by using an electromagnetic flowmeter. The electrode material uses tantalum electrode, and the lining material uses ceramic material or tetrafluoroethylene. In this way, the sludge flow measurement conditions can be solved.
Before sludge treatment, we must first understand the classification of sludge:
Treatment of physicochemical sludge discharged from sedimentation tank or thickening tank of waterworks. It is a medium and fine-grained organic and inorganic mixed sludge. The compressibility and dehydration performance are average.
The remaining activated sludge discharged from the secondary settling tank of the domestic sewage plant is hydrophilic, fine-grained organic sludge, with poor compressibility and poor dehydration performance.
Treatment of physicochemical and biochemical mixed sludge discharged from the thickening tank produced by industrial wastewater treatment. It is a medium-fine-grained mixed sludge. The dewatering performance of the fiber-containing body is better. The other compressibility and dewatering performance are average.
The physical and chemical fine-grained sludge produced by the physical method and chemical method discharged from the thickening tank from the industrial wastewater treatment. It belongs to the fine-grained inorganic sludge. The compressibility and dewatering performance are general.
Physical and chemical precipitation of coarse-grained sludge produced by industrial wastewater treatment. It belongs to coarse-grained hydrophobic inorganic sludge. It has good compressibility and dewatering performance.
Sino-Inst offers Sludge flow meter products. About 85% of these are Magnetic flow meters, 3% are Ultrasonic water meters. A wide variety of Sludge flow meter options are available to you, such as free samples, paid samples.
The top-selling countries or regions are China, India, and Israel, which supply 99%, 1%, and 1% of sewage flow meter respectively. Sludge flow meter products are most popular in Domestic Market, Mid East, and North America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and Other certifications.
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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.
4-20mA to 0-10v voltage, this is I/V conversion. That is current-voltage conversion, usually used for long-distance signal transmission in the industry.
How to convert a 4-20mA to 0-10V /1-5V signal?
There are two methods: one is to do it yourself with an operational amplifier. The other is to buy ready-made products, such as a 4-20MA/0-10V current-to-voltage isolation converter.
4-20mA is the standard output of our measuring instrument. Such as pressure transmitter, temperature transmitter, flow meter, liquid level transmitter, and so on.
In the field of industrial measurement and control, we often encounter the following problems:
How to convert 0-5V to 4-20mA, 0-20mA or 4-24mA?
How to convert 0-10V to 4-20mA, 0-20mA or 4-24mA?
How to transform ±5V, ±10V AC voltage signal into 4-20mA, 0-20mA, or 4-24mA DC current signal?
4-20mA means that the minimum current is 4mA and the maximum current is 20mA.
The industry generally needs to measure various non-electrical physical quantities, such as 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 a 4-20mA current to transmit analog quantities.
4-20mA
The general input impedance of 4-20mA is 250-300 ohm, which is not easy to have interfered. But maintenance measurement is more troublesome;
4-20ma DC signal can provide power. In addition, it is not affected by the load size within a certain range, and has strong anti-interference ability.
4-20mA can realize two-wire transmission, saving wires.
The current signal is suitable for long-distance transmission, but the current signal has weak anti-interference ability, and shielded wires are generally used.
0-10V
0-10v are generally high-impedance inputs and are susceptible to interference. But maintenance, measurement and calculation are all very convenient.
0-10V, is active, three-wire system, or four-wire system.
The voltage signal is stable and anti-interference is strong, but it is not suitable for long-distance transmission (with voltage drop);
The 4~20ma signal is the sensor transmission signal commonly used in industrial transmitters. It does not have a fixed-line voltage. The current is constant during transmission and the voltage changes with the load.
For our measurement and control instruments, it depends on whether your instrument wiring is a four-wire system or a two-wire system.
The four-wire system may be AC220V or DC24V; Two-wire system or three-wire system, generally DC24V.
Common standard analog signals are: 0-5V, 0-10V, ±5V, ±10V, 4-20mA, 0-20mA or 4-24mA. Common transmitters or sensors use one or more of the above formats to output standard signals.
Common secondary meters or acquisition cards generally accept input signals of one or more of the above formats.
When the output signal of the transmitter or sensor is different from the input signal format of the secondary instrument or acquisition card, we need to add a converter between them.
Because the 4-20mA standard signal has the advantages of strong anti-interference ability and no attenuation in the transmission process, it has been widely used in the field of measurement and control.
Often in order to achieve interface compatibility or improve electromagnetic compatibility, it is necessary to convert 0-5V, 0-10V and other standard voltage signals into 4-20mA standard current signals. Or the 4-20mA current signal needs to be converted into a 0-5V or 0-10V standard voltage signal suitable for the input of the acquisition card.
How to convert a 4-20mA to 0-10V /1-5V signal?
I have a pressure transmitter here that outputs a current of 4-20mA. As the input signal of the inverter. Now it is required to change the input signal of the inverter to a voltage signal. That is, the current of 4-20mA should be replaced with a voltage of 0-5V or 0-10V. The inverter has two inputs: 0-5V and 0-10V. Excuse me, how can it be transformed?
Answer: There are two schemes to achieve:
1.Use a hardware circuit to convert the input 4-20mA current signal into 0-5V or 0-10V voltage signal. See the circuit diagram below:
Connection:
Select the A input port: connect A+ and RA together, connect an external 4-20mA current input signal, and connect the A- terminal to the PLC common point M. A input port is set to 0~20mA current input mode.
The analog output port uses voltage output port V0, its M0 port is connected to the common terminal M, and the output port is set to voltage output mode: 0~10V (or 0~5V).
2.Use a signal converter
The signal converter converts the DC current or voltage signals of various devices on the site into the required DC signals for isolation and transmission and then outputs them to other instruments. The signal isolator can effectively eliminate ground return. Solve the problems of industrial field interference and signal conversion, transmission, and matching.
It is widely used in data acquisition, signal transmission and conversion, PLC, DCS, and other industrial measurement and control systems in electrical, power, telecommunications, steel, petrochemical, sewage treatment, environmental protection engineering, aerospace, building automation, and other fields. It is used to complete and supplement the system simulation I/O plug-in function. Increase The applicability of the system and the reliability of the on-site environment.
Main Specifications
Measurement: DC current, DC voltage, etc.
Accuracy: ≤±0.1% F·S
Power consumption: <1W (when 24VDC power supply)
Impedance: current input ≤100Ω, voltage input ≥500KΩ
Power supply: DC24V, AC220V or customized
Isolation: Input, output, and power supply are completely isolated
Support live hot swap operation. Easy to unload, high precision, high linearity, strong anti-interference
Long-term work stability
Input signal
Enter parameter code
Output 1
Output 2
Power supply
A DC power supply V DC voltage
Current Range A420 4-20mA A020 0-20mA A010 0-10mA T customer self-determined;
Or voltage range V0100-10V V15 1-5V V075 0-75mV V6 0-600V T customer self-determined
V010 0-10V V15 1-5V A4204-20mA A0100-10mA T customer self-determined
V0100-10V V151-5V A420 4-20mA A0100-10mA T customer self-determined No input
D DC24V A AC220V T customer self-determined
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.
Our paperless recorder, also known as Digital Chart Recorder. also has such a function. Support signal input and output. You can configure appropriate functions according to your own needs. What Is A Digital Chart Recorder?
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Sino-Instrument offers a variety of transmitters and sensors that support signal output. Including 4-20mA, 0-10V, 1-5V, etc.
About 30% of these are 4-20ma Pressure Transducers, 30% are Flow Meters, and 20% are Level Transmitters, 20% are 4-20ma Temperature transmitters.
Sino-Instrument is a globally recognized supplier and manufacturer of Pressure Transducers, located in China.
The top supplying country is China (Mainland), which supply 100% of Pressure Transducers respectively.
Sino-Instrument sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.
Low-Pressure Transducers 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.
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.
A laser level transmitter is also called a laser level meter. Industrial Accurate, non-contact, and uninterrupted real-time monitoring of material height. Designed for material level and liquid level. A laser level transmitter is a continuous or high-speed pulsed laser beam emitted by a semiconductor laser.
The laser beam meets the surface of the object to be measured and reflects. The light return is received by the laser receiver. And accurately record the time difference between laser emission and reception. In order to determine the distance from the laser radar to the measured object. Laser level transmitter is similar to radar/ultrasonic level sensor.
The laser level transmitter is a non-contact level gauge. The product is powerful, sturdy and durable. It has excellent accuracy and high stability. It achieves accurate, non-contact and uninterrupted real-time monitoring of material height. Industrial site and process, river water level monitoring, material height monitoring and other occasions have very broad applications.
The laser level transmitter adopts the phase method laser ranging technology. Using the frequency of the radio band, the laser beam is amplitude modulated and the phase delay produced by the modulated light going back and forth to the measuring line is measured. Then according to the wavelength of the modulated light, the phase delay represented by this is converted distance. That is, the indirect method is used to measure the time required for the light to pass through the measuring line.
The distance D from the surface of the material is proportional to the time travel T of the pulse:
D=C×T/2
Where C is the speed of light
Since the distance E of the empty tank is known, the level L is:
L=E-D
According to the range and full scale information set by the user, the processor calculates the percentage of the current material level, and then outputs 4-20mA or 0-5V analog signals, RS485 Modbus digital signals, and warning alarm relay switch signals in proportion.
Advantage:
The measuring beam has a small divergence angle and good directivity;
Large range, long-distance measurement, minimum blind spot;
Laser-level measurement has gained popularity in industrial applications. The advantage of laser level measurement is an accurate and simple measurement without contact with the measured material. Even materials with a low dielectric constant can be easily measured with a laser transmitter.
The laser beam is very narrow (divergence <0.3°), and a small spot is formed on the surface, which is usually less than 30cm even at a long distance. The figure below shows a typical installation on the storage bin. The laser transmitter is mounted on the reel using a rotating flange to ensure precise alignment to the bottom of the silo. In order to strengthen the protection, a dustproof tube is also used. For plastic applications, it is important to use metal mounting plates or flanges and ensure that they are properly grounded to the silo to help eliminate static buildup.
In order to use water resources rationally, real-time detection of the water level of various water areas is particularly important, so the demand for water level gauges is huge.
The laser level meter is a new type of distance measuring equipment with the advantages of high accuracy, fast response, large range, non-contact measurement, etc. It is suitable for my country’s rivers, lakes, reservoirs, hydraulics, ship locks, rivers, urban water and other liquid level monitoring occasions.
There are many different ways to measure the level of liquid in a tank, but laser tank level measurement is becoming increasingly popular. This is because laser tank level measurement is more accurate than other methods, and it is also much easier to install and maintain.
Laser tank level measurement works by sending a laser beam across the surface of the liquid in the tank. The laser beam is reflected off the surface of the liquid, and the time it takes for the laser beam to return to the sensor is measured. This time can then be used to calculate the level of the liquid in the tank.
One advantage of laser tank level measurement over other methods is that it is not affected by the temperature or density of the liquid. This means that it can be used to measure the level of liquids with very different properties, such as water and oil.
Another advantage of laser tank level measurement is that it is not affected by the build-up of sediment on the bottom of the tank. This can be a problem with other methods, such as ultrasonic level measurement, which rely on sound waves to measure the level of liquid.
Laser tank level measurement is also much easier to install than other methods. This is because there are no moving parts, and the laser beam can be directed through a small hole in the top of the tank. This means that laser tank level measurement can be used in tanks that are difficult to access, such as those in underground storage facilities.
If you are looking for a reliable and accurate way to measure the level of liquid in a tank, laser tank level measurement is the ideal solution.
Laser Level Transmitter is a large-range, high-accuracy explosion-proof level measurement product supplied by Sino-Inst. It has the functions of level measurement, average temperature measurement, switch alarm output, and can be displayed beside the tank. The product structure is reasonable, the precision is high, and the maintenance rate is low.
Laser Level Transmitter can measure media and application methods: particles, lumps, viscosity, water conservancy, distance measurement, liquid level measurement, material level measurement and other working conditions.
Laser Level Transmitter application scale: Liquid asphalt, polymerization reactor vessel (high pressure), reactor vessel (vacuum), molten glass, black and non-ferrous metals, alloy polystyrene. Pellets such as nylon, polyvinyl chloride, talc or lime powder, ores, waste rock from draw chutes, wet or dry wood chips. Mining, chemical. High-risk areas such as pharmaceuticals, paper, plastics, oil and gas.
Sino-Inst offers over 50 level transmitters for level measurement.
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.
A thermocouple chart is a practical tool for the electronic query of temperature index. It is used by technicians who are engaged in automatic control of the production process.
To simply look at it means: when 0 is the reference temperature and the measured temperature is the sum of the row and column temperatures, the measured thermoelectric potential is the value.
In the thermocouple chart, the first row and the first column are all temperature values. The rows are incremented by 10 degrees per grid. The columns are incremented by 100 degrees per grid. The intersection of the row and the column is the thermoelectric potential value at the current temperature.
Take the S-type couple to read the thermoelectric potential value at 280 degrees Celsius for example: first find 200 degrees from the first column, and draw a straight line to the right. Then find 80 degrees from the first line and draw a straight line down. Where the two lines meet, the thermoelectric potential value at 280 degrees is 2.141 millivolts.
Type K thermocouple chart
K Reference terminal temperature: 0℃, 10 degrees μν value
℃
0
10
20
30
40
50
60
70
80
90
0
0
397
798
1203
1611
2022
2436
2850
3266
3681
100
4095
4508
4919
5327
5733
6137
6539
6939
7338
7737
200
8137
8537
8938
9341
9745
10151
10560
10969
11381
11793
300
12207
12623
13039
13456
13874
14292
14712
15132
15552
15974
400
16395
16818
17241
17664
18088
18513
18938
19363
19788
20214
500
20640
21066
21493
21919
22346
22772
23198
23624
24050
24476
600
24902
25327
25751
26176
26599
27022
27445
27867
28288
28709
700
29128
29547
29965
30383
30799
31214
31629
32042
32455
32866
800
33277
33686
34095
34502
34909
35314
35718
36121
36524
36925
900
37325
37724
38122
38519
38915
39310
39703
40096
40488
40879
1000
41269
41657
42045
42432
42817
43202
43585
43968
44349
44729
1100
45108
45486
45863
46238
46612
46985
47356
47726
48095
48462
1200
48828
49192
49555
49916
50276
50633
50990
51344
51697
52049
1300
52398
52747
53093
53439
53782
54125
54466
54807
Type N thermocouple chart
N reference terminal temperature: 0℃, 10 degrees μν value
℃
0
10
20
30
40
50
60
70
80
90
0
0
261
525
793
1065
1340
1619
1902
2189
2480
100
2774
3072
3374
3680
3989
4302
4618
4937
5259
5585
200
5913
6245
6579
6916
7255
7597
7941
8288
8637
8988
300
9341
9696
10054
10413
10774
11136
11501
11867
12234
12603
400
12974
13346
13719
14094
14469
14846
15225
15604
15984
16336
500
16748
17131
17515
17900
18286
18672
19059
19447
19835
20224
600
20613
21003
21393
21784
22175
22566
22958
23350
23742
24134
700
24527
24919
25312
25705
26098
26491
26883
27276
27669
28062
800
28455
28847
29239
29632
30024
30416
30807
31199
31590
31981
900
32371
32761
33151
33541
33930
34319
34707
35095
35482
35869
1000
36256
36641
37027
37411
37795
38179
38562
38944
39326
39706
1100
40087
40466
40845
41223
41600
41976
42352
42727
43101
43474
1200
43846
44218
44588
44958
45326
45694
46060
46425
46789
47152
1300
47513
Type E thermocouple chart
E Reference terminal temperature: 0℃, 10 degrees μν value
℃
0
10
20
30
40
50
60
70
80
90
0
0
591
1192
1801
2419
3047
3683
4329
4983
5646
100
6317
6996
7683
8377
9078
9787
10501
11222
11949
12681
200
13419
14161
14909
15661
16417
17178
17942
18710
19481
20256
300
21033
21814
22597
23383
24171
24961
25754
26549
27345
28143
400
28943
29744
30546
31350
32155
32960
33767
34574
35382
36190
500
36999
37808
39426
40236
41045
41853
42662
43470
44278
45085
600
45085
45891
46697
47502
48306
49109
49911
50713
51513
52312
700
53110
53907
54703
55498
56291
57083
57873
58663
59451
60237
800
61022
61806
62588
63368
64147
64924
65700
66473
67245
68015
900
68783
69549
70313
71075
71835
72593
73350
74104
74857
75608
1000
76358
Type J thermocouple chart
J Reference terminal temperature: 0℃, 10 degrees μν value
℃
0
10
20
30
40
50
60
70
80
90
0
0
507
1019
1536
2058
2585
3115
3649
4186
4725
100
5268
5812
6359
6907
7457
8008
8560
9113
9667
10222
200
10777
11332
11887
12442
12998
13553
14108
14663
15217
15771
300
16325
16879
17432
17984
18537
19089
19640
20192
20743
21295
400
21846
22397
22949
23501
24054
24607
25161
25716
26272
26829
500
27388
27949
28511
29075
29642
30210
30782
31356
31933
32513
600
33096
33683
34273
34867
35464
36066
36671
37280
37893
38510
700
39130
39754
40382
41013
41647
42283
42922
43563
44207
44852
800
45498
46144
46790
47434
48076
48716
49354
49989
50621
51249
900
51875
52496
53115
53729
54321
54948
55553
56155
56753
57349
1000
57942
58533
59121
59708
60293
60876
61459
62039
62619
63199
1100
63777
64355
64933
65510
66087
66664
67240
67815
68390
68964
1200
69536
Type T thermocouple chart
T reference terminal temperature: 0℃, 10 degrees μν value
℃
0
10
20
30
40
50
60
70
80
90
0
0
391
789
1196
1611
2035
2467
2908
3357
3813
100
4277
4749
5227
5712
6204
6702
7207
7718
8235
8757
200
9286
9820
10360
10905
11456
12011
12572
13137
13707
14281
300
14860
15443
16030
16621
17217
17816
Type S thermocouple chart
S Reference terminal temperature: 0℃, 10 degrees μν value
℃
0
10
20
30
40
50
60
70
80
90
0
0
55
113
173
235
299
365
432
502
573
100
645
719
795
872
950
1029
1109
1190
1273
1356
200
1440
1525
1611
1698
1785
1873
1962
2051
2141
2232
300
2323
2414
2506
2599
2692
2786
2880
2974
3069
3164
400
3260
3356
3452
3549
3645
3743
3840
3938
4036
4135
500
4234
4333
4432
4532
4632
4732
4832
4933
5034
5136
600
5237
5339
5442
5544
5648
5751
5855
5960
6064
6169
700
6274
6380
6486
6592
6699
6805
6913
7020
7128
7236
800
7345
7454
7563
7672
7782
7892
8003
8114
8225
8336
900
8448
8560
8673
8786
8899
9012
9126
9240
9355
9470
1000
9585
9700
9816
9932
10048
10165
10282
10400
10517
10635
1100
10754
10872
10991
11110
11229
11348
11467
11587
11707
11827
1200
11947
12067
12188
12308
12429
12550
12671
12792
12913
13034
1300
13155
13276
13397
13519
13640
13761
13883
14004
14125
14247
1400
14368
14489
14610
14731
14852
14973
15094
15215
15336
15456
1500
15576
15697
15817
15937
16057
16176
16296
16415
16534
16653
1600
16771
16890
17008
17125
17245
17360
17477
17594
17711
17826
Type R thermocouple chart
R Reference terminal temperature: 0℃, 10 degrees μν value
℃
0
10
20
30
40
50
60
70
80
90
0
0
54
111
171
232
296
363
431
501
573
100
647
723
800
879
959
1041
1124
1208
1294
1381
200
1469
1558
1648
1739
1831
1923
2017
2112
2207
2304
300
2401
2498
2597
2696
2796
2896
2997
3099
3201
3304
400
3408
3512
3616
3721
3827
3933
4040
4147
4255
4363
500
4471
4580
4690
4800
4910
5021
5133
5245
5357
5470
600
5583
5697
5812
5926
6041
6157
6273
6397
6507
6625
700
6743
6861
6980
7100
7220
7340
7461
7583
7705
7827
800
7950
8073
8197
8321
8446
8571
8697
8823
8950
9077
900
9205
9333
9461
9590
9720
9850
9980
10111
10242
10374
1000
10506
10638
10771
10905
11039
11173
11307
11442
11578
11714
1100
11850
11986
12123
12260
12397
12535
12673
12812
12950
13089
1200
13228
13367
13507
13646
13786
13926
14066
14207
14347
14488
1300
14629
14770
14911
15052
15193
15334
15475
15616
15758
15899
1400
16040
16181
16323
16464
16605
16746
16887
17028
17169
17310
1500
17451
17591
17732
17872
18012
18152
18292
18431
18571
18710
1600
18849
18988
19126
19264
19402
19540
19677
19814
19951
20087
1700
20222
20356
20488
20620
20749
20877
21003
Type B thermocouple chart
B reference terminal temperature: 0℃, 10 degrees μν value
The working principle of thermocouple (thermocouple principle)
What is a thermocouple? This is to start with the principle of thermocouple temperature measurement. The thermocouple is a kind of temperature sensing element and a primary instrument. It directly measures temperature and converts the temperature signal into a term electromotive force signal. It is converted into a term electromotive force signal by an electrical instrument (secondary instrument). The temperature of the measured medium.
The basic principle of thermocouple temperature measurement is that two different components of material conductors form a closed loop. When there is a temperature gradient at both ends, there will be a current passing through the loop, and then there is Seebeck electromotive force-term electromotive force between the two ends. This is the so-called Seebeck effect.
Two homogeneous conductors with different compositions are term electrodes, the end with a higher temperature is the working end, and the end with a lower temperature is the free end, which is usually at a certain constant temperature. According to the functional relationship between term electromotive force and temperature, a thermocouple index table is made. The index table is obtained when the free end temperature is at 0℃. Different thermocouples have different index tables.
When the third metal material is connected in the thermocouple circuit, as long as the temperature of the two junctions of the material is the same, the thermoelectric potential generated by the thermocouple will remain unchanged, that is, it will not be affected by the third metal in the circuit. Therefore, when the thermocouple measures the temperature, it can be connected to the measuring instrument, and after the term electromotive force is measured, the temperature of the measured medium can be known.
The working principle of thermocouple:
Two conductors with different components (called thermocouple wires or thermoelectrodes) are connected at both ends to form a loop. When the temperature of the junction is different, an electromotive force will be generated in the loop. This phenomenon is called the thermoelectric effect. And The electromotive force is called thermoelectric force.
Thermocouples use this principle for temperature measurement. One end that is directly used to measure the temperature of the medium is called the working end (also called the measuring end), and the other end is called the cold end (also called the compensation end). The cold end and the display instrument or When the matching instrument is connected, the display instrument will point out the thermoelectric potential generated by the thermocouple.
A thermocouple is actually a kind of energy converter, which converts heat energy into electrical energy. Use the generated thermoelectric potential to measure temperature. Regarding the thermoelectric potential of a thermocouple, you should pay attention to the following issues:
The thermoelectric potential of a thermocouple is a function of the temperature difference between the two ends of the thermocouple. It is not a function of the temperature difference between the two ends of the thermocouple;
The size of the thermoelectric potential generated by the thermocouple. When the material of the thermocouple is uniform, it has nothing to do with the length and diameter of the thermocouple, but is only related to the composition of the thermocouple material and the temperature difference between the two ends;
When the two thermocouple wires of the thermocouple have determined the material composition. The thermoelectric potential of the thermocouple is only related to the temperature difference of the thermocouple. If the temperature of the cold junction of the thermocouple remains constant, the thermoelectric potential of the thermocouple is only Single-valued function of working end temperature.
Sino-Inst, Manufacturer for Thermocouples, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.
Sino-Inst’s Thermocouples, made in China, Having good Quality, With better price. Our Temperature measurement instruments are widely used in China, India, Pakistan, the US, and other countries.
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.
Paddle wheel flow meter is a mechanical flow meter that uses an impeller as a flow sensor component. The impeller-type flow meter is a meter that measures flow according to the principle of fluid momentum moment. Paddle wheel flow meter is also called an impeller flow meter, rotary wheel flow meter, etc. Typical Paddle wheel flow meters are water meters and turbine flow meters. It can be a mechanical transmission output type or an electric pulse output type. It is suitable for the measurement and control of industrial process clean water pipelines or low-concentration acid-base, low-viscosity single-phase fluid non-trade settlement process.
Suitable for highly corrosive fluids, sulfuric acid, nitric acid, hydrofluoric acid, hydrochloric acid, mixed acid, strong alkali and other places; The flow parts are made of corrosion-resistant materials such as PVDF·PTFE·Hastelloy·Titanium alloy; there is almost no pressure loss and maintenance-free; Flow velocity range 0.3-6m/s, can measure fluid with flow velocity greater than 0.3m/s; Not applicable to media containing particles and fibrous impurities;
The impeller adopts a five-piece runner design PP/PVDF/PTFE material Better guarantee the dynamic balance characteristics, greatly improving the linear accuracy and repeatability accuracy of the sensor; The minimum flow rate is 0.1m/s; NPN open collector output, which can be directly transmitted to a flow transmitter or PLC, a standard square wave signal and a maximum distance of 300m; Applicable caliber: DN25-DN600 (1″-24″); Not suitable for particles and fibrous impurities The medium;
Caliber range
DN25-DN600(1″-24″)
DN25-DN600(1″-24″)
Flow rate range
0.3-5m/s
0.1-8m/s
Output signal
Square wave pulse signal: (40-45Hz) nominal flow rate per m/s
Square wave pulse signal: (40-45Hz) nominal flow rate per m/s Equipped with pulse conversion components can output 4-20mA
Characteristic
Hall pulse output, open collector NPN, strong driving ability Has high chemical resistance Minimum flow rate 0.3m/s IP68 protection grade suitable for harsh on-site environment
Hall pulse output, open collector NPN, strong driving ability Has high chemical resistance IP68 protection grade suitable for harsh on-site environment Plug-in type, easy installation, good reliability, almost maintenance-free
Sulfuric acid ratio and delivery flow monitoring Copper sulfate monitoring in electroplating bath Nitric acid mixture Intermediate Chemical waste
Pure Water Process/Reverse Osmosis/Ultrafiltration/EDI Water purification and filtration system Cooling water and boiler water monitoring Chemical industry Agricultural irrigation Cleaning system and single crystal silicon cleaning Pump protection
The sensor is divided into two parts: the transmitter and the impeller. The impeller is in direct contact with the fluid, and the transmitter is isolated from the fluid. The liquid flow drives the impeller to rotate, and there are four evenly distributed magnetic blades on the impeller. The rotating magnetic blade induction Hall switch generates a frequency signal proportional to the flow rate, and the transmitter converts the frequency signal into a 4-20mA current signal.
Typical Paddle wheel flow meters are water meters and turbine flow meters. The structure can be a mechanical transmission output type or an electric pulse output type.
The accuracy of water meters with general mechanical transmission output is low, with an error of about ±2%. However, the structure is simple and the cost is low. It has been mass-produced in China, and is standardized, generalized and serialized. The accuracy of the turbine flowmeter output by the electric pulse signal is relatively high, and the general error is ±0.2%-0.5%
The five-piece impeller design is in line with the principle of fluid mechanics, and the uniform force angle produces a better dynamic balance, ensuring better linear accuracy and repeatability accuracy
Various shafts and bearings: Shaft and bearing: ZrO2, SS316L, Hastelloy C Impeller material: PTFE, PP, PVDF, ABS Body material: PP plus glass fiber, ABS, CPVC, PTFE, SS316L, brass
Real flow calibration Calibration range: DN10-DN1000 Each sensor has undergone strict calibration and quality inspection. When leaving the factory, each sensor guarantees that the K factor is 2% of the standard value, and the repeatability accuracy is 0.5%;
The straight section behind the flange must meet the measuring distance of the first 10 and the rear 5 times the pipe diameter;
After reducing the diameter (only allowed to change from large to small, but not allowed to change from small to large), the straight line segment needs to meet the measurement distance of the first 15 and the back 5 times the pipe diameter;
The straight section behind the first-level equal-diameter elbow needs to meet the measuring distance of the first 20 and 5 times the pipe diameter;
The straight section behind the two-stage continuous equal-diameter elbow on the same plane must meet the measurement distance of the first 25 and the rear 5 times the pipe diameter;
The straight section behind the non-coplanar two-stage continuous equal-diameter elbow needs to meet the measuring distance of the first 40 and the back 5 times the pipe diameter;
The straight section behind the valve must meet the measurement distance of the first 50 and the last 5 times the pipe diameter;
The probe is recommended to be installed perpendicular to the pipe, and not at the bottom of the pipe;
The probe can be installed on a vertical pipe where the liquid flows upward, but it must also meet the requirements of the above-mentioned straight section;
The probe is not allowed to be installed on a vertical pipe where the liquid flows downward;
The liquid in the tested pipeline must be full of flow, and no gas and liquid can flow at the same time;
The cost of the body must be consistent with the bayonet (open slot) to ensure the correct installation position;
The O-ring has a good sealing effect. When the installation is tight, it needs to be wetted with silicone oil or water for installation;
The sensor locking cap must be tightened to prevent excessive pressure in the pipeline from leaking or ejecting;
When installing outdoors, pay attention to waterproof treatment; keep the cables dry to avoid moisture damage;
Do not lay the sensor cable and AC power cable in the same protective tube to avoid electrical interference
Sino-Inst offers a variety of Digital Beer Flow Meters for flow measurement. If you have any…
Sino-Inst, paddle wheel flow meter manufacturer. It can measure a single sound-conducting liquid medium of Velocity range: 0.1~6m/s; Pipe diameter: DN15 to DN600.
Sino-Inst’s paddle wheel flow meter, made in China, Having good Quality, With a better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.
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.