Ultrasonic Liquid Level Sensor can realize non-contact liquid level measurement. Continuous online monitoring of water level and sludge interface position.

ULT-200 Ultrasonic Liquid Level Sensor is a split type ultrasonic liquid level/level sensor. Measuring liquid level and converting it to an electrical signal. Non-contact liquid level measurement can be achieved. Split ultrasonic level gauges are widely used for liquid level and volume measurement of tanks, pools, and reservoirs. It can also be used for flow measurement in open channels.

Features of Ultrasonic Liquid Level Sensor

• The distance accuracy can be calibrated online in different environments, the start and end points of the range, and the type of analog output. The lock value of the liquid level window can be set by the keyboard.
• Automatically track the ambient temperature to compensate for the distance value.
• With 2-4 limit settings. Can be used for liquid level segment or position control (optional).
• With RS485/232 serial data output or 4-20mA/0-20mA analog output or 1-5V/0-5V analog output (optional).
• With “echo intelligent recognition” function and “medium slope” digital filtering function.
• For Xiaotong’s measurement target, the user can set the detection cycle from 100 times to 0.1 times per second;
• With the option of value-added/difference ranging mode, both ranging and position measurement can be performed.
• It can be operated by keyboard. Turn on the backlight of the LCD display at night for easy viewing and debugging. You can also turn off the display during work to save energy.
• It has 1-15 levels of transmission power options, which can be set and modified at any time according to the working conditions.
• It has functions such as temperature compensation, window locking and anti-interference error correction, medium sound velocity adjustment (optional when ordering).
• It has the function of arbitrarily digitizing the start and end of the full scale.
• It has an artificial digital correction platform for temperature difference compensation in the acoustic wave transit area.
• With 4mA, 20mA digital fine-tuning function, debugging is very convenient and quick.
• When the LCD displays, the display information is very rich, from the level, weight, temperature, current, voltage, limit switch status and other information are all displayed on the LCD screen, so that the user can know the working status of the instrument.
• Serial data transmission can be sent either point-to-point or bus type.

Extended reading: Sludge flow meter for sewage treatment return activated sludge system

Specifications of ULT-200 Ultrasonic Liquid Level Sensor

Extended reading: Radar Non Contact Water Level Sensor

Applications of Ultrasonic Liquid Level Sensor

• River and reservoir level measurement
• Tank measurement
• Reservoir
• Water tank water tower
• Acid-base tank level monitoring
• Reactor/tank/liquid level measurement
• Manhole
• Municipal Engineering
• Tap water
• Sewage treatment
• Water Resources and Hydropower
• Urban rivers and lakes, transportation and food processing industries
• Sewage treatment plant: primary sedimentation tank, secondary sedimentation tank, thickening tank, etc.
• Water supply plant: sedimentation tank
• Coal washing plant: sedimentation tank
• Power plant: mortar sedimentation tank, etc.

More about Application 1: Liquid Level Monitoring In The Food And Beverage Processing.

Ultrasonic Level Measurement Principle

How does ultrasonic level measurement work?

When Ultrasonic Liquid Level Sensor is working, high-frequency pulse sound waves are emitted by the transducer (probe). The surface of the measured object (water surface) is reflected. The returned reflected echo is received by the same transducer (probe) and converted into an electrical signal.

The time between the sending and receiving of the pulse (the movement time of the sound wave) is proportional to the distance from the transducer to the surface of the object. The relationship between the distance S of sound wave transmission and the speed of sound C and transmission time T can be expressed by the formula: S= CⅩT/2

Extended reading: Case Study: Automatic Sludge Blanket Level Detector

The installation of ultrasonic level meter must consider the blind area of ​​ultrasonic level meter. When the liquid level enters the blind zone, the ultrasonic transmitter cannot measure the liquid level. Therefore, when determining the range of the ultrasonic level gauge, a margin of 50 cm must be left. When installing, the transmitter probe must be about 50 cm above the high liquid level. Only in this way can we ensure the accurate monitoring of the liquid level and the safety of the ultrasonic level gauge.

Pay attention to the mechanical installation:

The installation should be perpendicular to the surface of the object to be measured, avoid using it to measure foamy objects. Avoid installation where the distance from the surface of the measuring object is less than the blind spot distance. Blind spot: Each product has a standard, which is known with the product. It should be considered that the beam avoids the blocking material and does not meet the filling mouth and the container wall. When detecting large solid objects, the probe position should be adjusted to reduce the measurement error.

Extended reading: Guide to Ultrasonic Level Transmitters

More Featured Ultrasonic Level Sensors for Tanks

Extended reading: Ultrasonic level transmitter for Hazardous Liquids

Ultrasonic Liquid Level Sensor Advantages and Disadvantages

The advantages of ultrasonic liquid level sensor are very outstanding. It is mainly reflected in the following aspects:

1. The structure is simple. The reading is convenient. It is very easy to install and maintain.
2. Safe and clean. The instrument has long service life. The measurement is stable and reliable with high precision.
3. Adopt non-contact measurement. It is not easily affected by the viscosity and density of the liquid.

Of course, the ultrasonic liquid level sensor also has its own limitations and insurmountable defects. Specifically, it is mainly manifested in:

1. There is a blind spot in the ultrasonic liquid level measurement. The dead zone is the area where the meter cannot measure. During the transmission of ultrasonic pulses, a small area near the ultrasonic transducer usually cannot receive sound waves. The blind zone where sound waves cannot be received is related to the measurement distance of ultrasonic waves. Generally speaking, the smaller the measurement distance, the smaller the blind zone. The larger the measurement distance, the larger the blind zone;
2. Ultrasonic liquid level measurement is easily affected by temperature. In the actual measurement, the change of temperature will cause the change of sound speed. This will lead to errors in the measurement;
3. There should be no obstacles under the sound wave. Because the ultrasonic liquid level meter uses the principle of sound wave reflection to achieve liquid level measurement. If there are obstacles, it will affect the ultrasonic emission, causing signal loss and affecting the measurement effect;
4. Ultrasonic liquid level sensor should not be used to measure pressure vessels. Because the pressure mainly affects the probe. There is also a certain relationship between the pressure and the temperature. The change in pressure will affect the change in temperature. This will affect the change in the speed of sound. The accuracy of the measurement will be affected;
5. Ultrasonic liquid level sensor can not be used in the occasions with water mist, medium that is easy to produce a lot of foam, and volatile medium. Because this kind of working condition is easy to absorb the sound wave or interfere with the sound wave emission, the signal is lost and the accuracy is reduced;
6. Ultrasonic liquid level sensor is greatly affected by dust. This is because although the dust environment has little effect on the speed of sound, it has a very significant effect on the attenuation of sound waves. Therefore, it is best not to use an ultrasonic level gauge in the presence of dust.

Extended Reading: Procurement Guide for Ultrasonic liquid level sensors

Related Blogs

Extended reading: Magnetostrictive Hydraulic Cylinder Position Sensor

Sino-Inst offers 20 ultrasonic level detectors products. About 13% of these are ultrasonic level transducers, 4% are ultrasonic level indicator. A wide variety of Ultrasonic liquid level sensor options are available to you, such as free samples, paid samples.

Sino-Inst is ultrasonic level transmitter suppliers, located in China.

UltraUltrasonic liquid level sensor products are most popular in North America, Mid East, and Eastern Europe. The United States, and India, which export 99%, 1%, and 1% of ultrasonic level transmitter respectively. You can ensure product safety by selecting from a certified supplier, with ISO9001, ISO14001 certification.

Request a Quote

KimGuo11

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.

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Ultrasonic Level Transducer, also called Ultrasonic level sensor, or ultrasonic level transmitter.
Ultrasonic level meter (measuring material level, liquid level) is a non-contact, highly reliable, cost-effective, and easy-to-install and maintain level measuring instrument. It can meet most of the level measurement requirements without contacting the medium.

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• Features
• Specifications
• Applications

Features of Ultrasonic Level Transducer

• The large measuring range can reach 40m, and the solid material level measurement can reach 25m.
• The small resolution is 1mm.
• Large LCD/LED display.
• Intelligent signal processing technology.
• All plastic anticorrosive shell: protection grade IP67.
• Transducer structure: There is no requirement for flange connection length when the small range level meter is flanged.
• Simple button setting parameters: no need to wait for the container to empty or fill up, no need for an additional remote control.
• Flexible installation methods: thread (flange), fixed hole (bracket).
• The probe can be extended: it is suitable for outdoor installation in a closed container in cold areas to prevent frost.
• Equipped with high and low double relays: the four-wire system provides this function.
• AC and DC power supply forms are optional: four-wire system and split machine mainframe provide this function.

Ultrasonic level gauge and other level gauge technologies

1. Compared with laser ranging technology, it has the advantages of simplicity and economy;
2. Ultrasound technology generally does not require moving parts, so installation and maintenance are relatively convenient;
3. Ultrasonic level meter can not only fix point and continuous position measurement, but also can conveniently provide signals required for remote measurement or remote control;
4. Compared with the radioactive location technology, the ultrasonic level meter does not require protection.

Technical characteristics

1. Transducer with strong emission power. The surface can be self-cleaning. The use of updated transducer structure and manufacturing technology. The working performance of the transducer is significantly improved.
2. Microprocessor program control and intelligent signal processing technology can realize a variety of typical working condition software processing modes. The level meter can adapt to complex working conditions such as solids, liquids, and dust.
3. Infrared remote control programming adjustment, simple and reliable operation, and with LCD on-site display.
4. Non-contact continuous measurement, reducing maintenance;
5. It can be used to measure level, space and distance, and can also perform automatic level-volume conversion for standard or special switch tanks;
6. The LCD with backlight can display according to standard engineering units.

Specifications of Ultrasonic Level Transducer

Features	Integral type	Split type
Range	5 meters, 10 meters, 15 meters, 20 meters, 30 meters, 40 meters, 50 meters, 60 meters	5 meters, 10 meters, 15 meters, 20 meters, 30 meters, 40 meters, 50 meters, 60 meters, 70 meters,
measurement accuracy	0.5%-1.0%	0.5%-1.0%
Resolution	3mm or 0.1% (whichever is greater)	3mm or 0.1% (whichever is greater)
display	Chinese LCD	Chinese LCD
Analog output	4-wire 4~20mA/510Q load; 2-wire 4~20mA/250Q load	4~20mA/510Q load
Relay output	Optional 2 groups of AC250V/8A or DC; 30V/5A state programmable	(Optional) Single-channel is 2 groups, dual-channel is 4 groups AC250V/8A or DC30V/5A state programmable
powered by	Standard 24VDC; optional 220VAC+15%50Hz	Standard 220VAC+15%50Hz; optional 24VDC120mA; customized 12VDC or battery power supply
Ambient temperature	Display instrument -20~+60℃, probe -20~+80℃	Display instrument -20~+60℃, probe -20~+80℃
Communication	Optional 485,232 communication (manufacturer agreement)	Optional 485,232 communication (manufacturer agreement)
Protection level	Display instrument IP65, probe IP68	Display instrument IP65, probe IP68
Probe cable	no	Up to 100 meters, standard 10 meters
Probe installation	According to the range and probe selection	According to the range and probe selection

Ultrasonic level meter application

Liquid level and material level measurement is a problem frequently encountered in the industry. Ultrasonic positioning technology has many advantages. It can not only fixed-point and continuous positioning. And it can conveniently provide signals required for telemetry or remote control.

Compared with radioactive location technology, ultrasound technology does not require protection.
Compared with laser-ranging technology, it has the advantages of simplicity and economy.
At the same time, ultrasound technology generally does not require moving parts. Therefore, it is relatively convenient to install and maintain.

Ultrasonic level gauges can be widely used in petroleum, mining, power plants, chemical plants, water treatment plants, sewage treatment stations, agricultural water, environmental monitoring, food (brine industry, beverage industry, additives, edible oil, dairy products), flood control Flood prevention, hydrological monitoring, open channels, spatial positioning, and many other industries.

Read more about: Application 1: Liquid Level Monitoring In The Food And Beverage Processing

Learn More: Sanitary ( hygienic ) Pressure Transmitter

Magnetostrictive level sensor

What is ultrasonic level measurement?

Ultrasonic waves detect an object in the same way as Radar does it.

Ultrasonic uses sound waves, and Radar uses radio waves.

When the ultrasonic pulse signal is targeted towards an object, it is reflected by the object, and the echo returns to the sender.

The time traveled by the ultrasonic pulse is calculated, and the distance of the object is found.

Bats use a well-known method to measure the distance while traveling.

The ultrasonic level measurement principle is also used to find out fish positions in the ocean, locate submarines below water level, also the position of a scuba diver in the sea.

Level = Speed of sound in air x Time delay / 2

Ultrasonic level transducer working principle

During level measurement. The ultrasonic signal is sent out by the ultrasonic probe. Fold back after being reflected on the surface of a liquid or solid material. It is received by the same probe and measures the entire running time of the ultrasonic wave, so as to realize the level measurement. The relationship between sound wave transmission distance and sound speed and sound transmission time can be expressed by the formula:

The calculation formula of the ultrasonic level meter The calculation formula L of the ultrasonic level meter: the distance between the ultrasonic probe and the measured material surface. Unit: m;

v: Sound velocity value after temperature compensation. Unit: m/s;

t: The running time of the sound wave in the measuring range. Unit: s

Extended reading: The Secret of Ultrasonic Level Measurement

Introduction to the main indicators of Ultrasonic Level Transducer

1. Range.
   It represents the large range that the ultrasonic level meter can measure and reflects the sensitivity of the transducer.
   The larger the range, the higher the sensitivity.
   The ultrasonic level meter can be equipped with transducers of different ranges such as 4, 6, 8, 10, 20, 30m.
   When the ultrasonic attenuation is fast and the interface reflection is poor. In order to avoid the ultrasonic signal received by the ultrasonic probe is too weak. If it cannot be distinguished from the noise signal, it is necessary to increase the transmitting power of the transducer.
2. Blind area.
   It is also called the dead zone, which is a distance that cannot be measured by the ultrasonic level meter.
   When the ultrasonic level meter transmits ultrasonic pulses, it cannot detect the reflected echo at the same time.
   Because the transmitted ultrasonic pulse has a certain time width. At the same time, the sensor still has after-vibration after transmitting the ultrasonic. During this period, the reflected echo cannot be detected. Therefore, a small distance from the probe surface downward cannot be detected normally, and this distance is called a blind zone.
   For products with the same measuring range, the smaller the blind zone, the better the design of the transducer.
3. Temperature.
   The normal range is -10~60 degrees Celsius.
   Although the limit working temperature of piezoelectric ceramics is generally 150 degrees Celsius. However, most of the materials in the manufacturing process of the ultrasonic level gauge cannot work for a long time at a temperature above 100 degrees Celsius.
4. Precision.
   It is mainly affected by temperature changes to ensure measurement accuracy. Most ultrasonic level meters are equipped with temperature compensation.
   In addition, changes in the gas composition will also affect the accuracy of the ultrasonic level gauge. For example, some volatile liquids. After volatilization, the air composition changes and the sound velocity of the gas changes, causing measurement errors. Most manufacturers can control the accuracy within 0.5% under normal temperature and pressure and without interference from the external environment.
5. Two-wire system and three-wire system.
   The power supply (DC24v) and signal output (DC4-20mA) of the two-wire ultrasonic level meter share the same circuit. That is, only two wires are used. The disadvantage is that the transmit power is relatively weak.
   The three-wire ultrasonic level meter is actually a four-wire system. Its power supply (DC24v) and signal output (DC4-20mA) loops are separated. Two wires are used for each. When their negative ends are connected to the common ground, three wires are usually used . Its advantage is that the transmit power is larger.

Extended reading: Applicaitons Of Magnetostrictive Level Transmitters

Ultrasonic Level Transducer measurement influencing factors

Various factors will affect its stable and reliable measurement when it is actually used in the field. Below we will combine the actual situation to describe the influence of various interferences on the selection, use and installation of ultrasonic level meters.

(1) The influence of medium and ambient temperature

When the ultrasonic wave is reflected from the surface of the material, its reflection frequency will be affected by the temperature of the material and change. In order to compensate for this change, a temperature sensor is installed in the ultrasonic probe. When the probe sends the reflected signal to the processor at the same time. The temperature signal is also sent to the microprocessor, and the processor will automatically compensate for the influence of temperature on the level measurement.

In addition, in order to ensure the reliable operation of the probe, it is required that the ambient temperature does not exceed 60°C.

(2) The influence of the agitator on the measurement of the level meter

If the material container is equipped with a stirrer, it will also reflect the ultrasonic signal, causing false reflection echo, which is transmitted to the microprocessor.

The microprocessor will process the true and false mask echoes based on statistical principles, so it is required that the echo reflected by the ultrasonic wave from the surface of the material should be at least 3 times the echo reflected from the stirrer arm.

Appropriately reduce the speed of the stirrer, or move the probe away from the stirring center. Both can effectively eliminate the influence of the false surface reflection produced by the agitator on the level measurement.

(3) Ultrasonic level meter measures the limit value of the material level

1) High material level

When an ultrasonic pulse is transmitted to the surface of the material, if it receives a reflected wave from the surface of the material, it will not be able to measure, and this distance is a blind zone. The material level shall not be higher than the blind zone.

2) Low material level

The di level is the distance from the sensor that the ultrasonic wave can reach. And the reflected echo can be received by the sensor. Due to the attenuation of ultrasonic waves in the propagation process and the absorption of sound waves on the surface of the material, this propagation distance is strongly dependent on the nature of the material.

In short, as long as the instrument is selected and installed properly, the application effect of the ultrasonic level gauge is quite satisfactory.

Extended reading: How to Choose the Right Diesel Fuel Level Sensor?

More Featured Products

Sino-Instrument offers 20 ultrasonic level transducers products.

About 13% of these are ultrasonic level transmitters, 4% are an ultrasonic level indicator.

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

Sino-Instrument is an ultrasonic level transmitter supplier, located in China.

Ultrasonic level transducer products are most popular in North America, Mid East, and Eastern Europe.

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

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

Request a Quote

KimGuo11

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.

drurylandetheatre.com