Ultrasonic Level Transmitters For Continuous Non-contact level measurement of liquid & solids.

What is an Ultrasonic level transmitter?

Ultrasonic level transmitter is a non-contact level sensing technology. Measure solid material level and liquid level. The ultrasonic level transmitter is similar to the radar level sensor. But the price of an ultrasonic level transmitter is better. Sino-Inst provides Compact, split, explosion-proof, and intrinsically safe ultrasonic level transmitters. Measuring ranges within 30 meters. Used for tank level measurement, river water level measurement, etc.

Guide to Ultrasonic Level Transmitters


  • Non-contact measurement is less affected by the viscosity and density of the liquid. 2.
  • There are 5 meters, 10 meters, 15 meters, 20 meters, 30 meters range optional. 3.
  • Protection level: probe IP68. display IP65.
  • Optional explosion-proof and isolated explosion-proof in this case.
  • Anti-corrosion material is optional 6.
  • 0-4 relays are optional.

Featured Ultrasonic level transmitters

ModelIntegrated ModelSplit model
PicturesULT-100A Ultrasonic Level TransducerULT-100A Ultrasonic Level TransducerULT-200 Ultrasonic Level DetectorULT-200 Ultrasonic Level Detector
Measuring range5m、10m、15m、20m、30m5m、10m、15m、20m、30m
Resolution3mm or 0.1% (choose the bigger)3mm or 0.1% (choose the bigger)
DisplayLCD LCD
Analog output4 wire system 4~20mA/510Q loading
2 wire system 4~20mA/250Q loading
4~20mA/510Q loading
Relay output2 sets of AC 250V/ 8A or DC 30V/ 5A are optional, state is programmable2 sets of single-channel are (optional), the double channel is 4 sets of AC 250V/ 8A or DC 30V/ 5A, the state is programmable
Power supplyStandard: 24VDC 
Optional: 220VAC + 15% 50Hz
Standard: 220V AC + 15% 50Hz
Optional: 24VDC 120m
Customized 12VDC or battery-powered
Environmental temperatureMeter display -20 ~ +60°C 
Probe -20~+80°C
Meter display -20~ +60°C 
CommunicationOptional 485,232 communication (manufacturer agreement)Optional 485, 232 communication (manufacturer agreement)
Protection classDisplay meter IP65, Probe Ip68Display meter IP65, Probe Ip68
Probe cableNo100m reachable, standard 10m
Probe installationSelection based on measuring range and probeSelection based on measuring range and probe

Structure of an Ultrasonic level transmitter:

The ultrasonic sensor is mainly composed of a piezoelectric crystal. It can not only transmit ultrasonic waves but also receive ultrasonic waves.

Small power ultrasound probes are usually used for testing. Many of its friends have different structures, which can be divided into straight probe (longitudinal wave), oblique probe (transverse wave), elastic wave probe (surface wave), lamb wave probe (lamb wave), double probe (one probe reflection, one Probe receiving) and so on.

The core of the ultrasonic laser sensor is a piezoelectric chip in a plastic or alloy metal shell. The material constituting the wafer may be different from these. The size, diameter and thickness of the chip are also different. Therefore, the performance of each sensor is different, and we need to know its performance in advance during use.

The working principle of the ultrasonic level transmitter is:

Ultrasonic transducer (probe) emits high-frequency pulse sound waves, and the surface of the measured level (material) is reflected back. The reflected echo is received by the transducer and converted into an electrical signal. The propagation time of the sound wave is proportional to the distance from the sound wave to the surface of the object.

The relationship between the sound wave transmission distance S and the sound speed C and the sound transmission time T can be expressed by the formula: S=C×T/2.

The probe part emits ultrasonic waves, which are then reflected by the liquid surface.

The probe part is received again. The distance from the probe to the liquid (object) surface is proportional to the elapsed time of the ultrasonic wave:
hb = CT2
Distance [m] = time × speed of sound/2 [m]
The temperature compensation formula of sound velocity:
Ambient sound velocity = 331.5 + 0.6 × temperature

Read more: Guide: Non-contact Ultrasonic Level Sensing transmitters

Advantages of ultrasonic level transmitter:

  1. Transducer with strong emission power, the surface can be self-cleaning. Utilize updated transducer structure and manufacturing process. Significantly improve the working performance of the transducer.
  2. Microprocessor program control, intelligent signal processing technology. A variety of software processing modes for typical working conditions can be realized. The level gauge can adapt to complex working conditions such as solids, liquids, and dust.
  3. Infrared remote control programming adjustment. The operation is simple and reliable. And with LCD on-site display.
  4. Non-contact continuous measurement, reducing maintenance;
  5. It can be used to measure level, space and distance. It 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.

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

Disadvantages of ultrasonic level transmitter:

  1. When the density of the ultrasonic propagation medium changes, the speed of sound will also change. Seriously affect the measurement accuracy;
  2. Ultrasonic level gauge is more sensitive to temperature and pressure. Therefore, it is generally necessary to measure at room temperature and pressure.
  3. Some substances have a strong absorbing effect on ultrasonic waves. The specific conditions and conditions of liquid level measurement should be fully considered when selecting measurement methods and measuring instruments.

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


Liquid level and material level measurement is a problem frequently encountered in the industry. Ultrasonic positioning technology has many advantages. It can not only fix-point and continuous positioning but also conveniently provide signals required for remote measurement 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, ultrasonic technology generally does not require moving parts, so installation and maintenance are relatively convenient.

Application areas of ultrasonic level transmitters:

  • Water and sewage treatment: pump room, collection well, biochemical reaction tank, sedimentation tank, etc.
  • Electric power, mines: mortar pool, coal slurry pool, water treatment, etc.
  • Agricultural water, environmental monitoring, food (brine industry, beverage industry, additives, edible oil, dairy products),
  • Many industries such as flood control, hydrological monitoring, open channels, and spatial positioning.

Extended reading: The Secret of Ultrasonic Level Measurement

Normally, the price of an ultrasonic level transmitter will be cheaper than a radar level sensor.

As a manufacturer, Sino-Inst will provide you with the best ultrasonic level transmitter price.

Of course, different measurement parameters require the use of ultrasonic level transmitters with different functions. Therefore, the price will be different.

Here we provide the reference price of ultrasonic level transmitter:

Compact ultrasonic level transmitter
Threaded installation
Temperature and pressure
12 meters,
Medium: normal temperature and pressure, non-corrosive
Output 4-20mA
Price: USD 485.00/pc
Compact ultrasonic level transmitter
Threaded installation
Temperature and pressure
25 meters,
Medium: normal temperature and pressure, non-corrosive
Output 4-20mA
Price: USD 781.50/pc

If you need to purchase an ultrasonic level transmitter. You can contact our sales engineer. We will provide the best price according to your measurement requirements.

Ultrasonic level transmitter installation basic requirements

When an Ultrasonic level transducer emits an ultrasonic pulse, it has a certain emission opening angle.
From the lower edge of the transducer to the surface of the measured medium, there must be no obstacles in the area radiated by the emitted ultrasonic beam.
Therefore, the installation in the tank should be avoided as far as possible. Such as human ladder, heating equipment, limit switch bracket, etc.
In this case, “false echo learning” must be performed during installation.

Also, note that the ultrasonic beam must not intersect the feed stream.

Attention should be paid to the installation of an integrated ultrasonic liquid level timer:

  • The highest material level must not enter the measurement blind zone.
  • The integrated ultrasonic level gauge must keep a certain distance from the tank wall.
  • The installation of the integrated ultrasonic level gauge is as far as possible so that the transducer is kept perpendicular to the liquid surface.
  • The integrated ultrasonic level gauge installed in the hazardous area must comply with the national explosion-proof hazard installation regulations.
  • Intrinsically safe integrated ultrasonic level gauges are installed where explosion-proof requirements are required, and the ultrasonic level gauges must be grounded.
Ultrasonic level transmitter installation basic requirements 1

The reference plane for measurement is the lower edge of the ultrasonic level gauge transducer. Description: ①Blind zone range; ②range setting; ③high position adjustment; ④low position adjustment

Ultrasonic level transmitter installation basic requirements 2

When installing, pay attention to keeping the distance between the integrated ultrasonic level gauge and the tank wall at least 200mm. ①Datum plane②Central or symmetry axis of container

The integrated ultrasonic level gauge should be installed in the center of the top of the conical tank.

For conical containers, it is a flat top. The best place to install the meter is at the top center of the container. This will ensure that the bottom of the container is measured.

Ultrasonic level transmitter installation basic requirements 3

In actual application, there are two methods for radar-level sensors. Namely, frequency modulated continuous wave type and pulse wave type.

The liquid level sensor using FM continuous wave technology has high power consumption. Must adopt a four-wire system, and the electronic circuit is complicated.

The liquid level sensor using radar pulse wave technology has low power consumption and can be powered by two-wire 24VDC. Which is easy to achieve intrinsic safety and has a wider application range.

Ultrasonic sensors use sound waves, and radar uses electromagnetic waves. This is the biggest difference.

And the penetrating ability and directivity of ultrasonic are stronger than electromagnetic waves.

This is why ultrasonic detection is more popular now. The difference between the main applications:   

  1. Ultrasonic accuracy is not as good as radar.   
  2. The relative price of radar is relatively high.  
  3. When using radar, consider the dielectric constant of the medium.   
  4. Ultrasound cannot be applied to working conditions such as vacuum, high steam content or foam on the liquid surface.   
  5. The radar measurement range is much larger than that of ultrasonic.   
  6. The radar has a horn type, a rod type, and a cable type. Compared with ultrasonic, it can be applied to more complicated conditions.

Extended reading: Radar Non Contact Water Level Sensor

Read more about 7 Level Senors for Tank Level Measurement

Related Products:

Sino-Ins offers 20 ultrasonic level transmitters products.

About 13% of these are ultrasonic level transducers, 4% are ultrasonic level indicators.

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

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

Ultrasonic level transmitter 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.

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