HS-2000 Ultrasonic Tank Level Sensor-External Mounted

The HS-2000 External Ultrasonic Tank Level Sensor is a Non-invasive/non-contact device that accurately measures liquid levels in sealed tanks. To measure the liquid level in the tank by sticking an external sensor to the bottom of the tank. Its advanced technology and easy installation make it ideal for various liquids, including toxic or acidic ones.

Sino-Inst offers a variety of Ultrasonic Tank Level Sensors for industrial tank level measurement. If you have any questions, please contact our sales engineers.

External ultrasonic tank level sensor

HS-2000 External Mounted Ultrasonic Tank Level Sensor- (referred to as “external level gauge”). It adopts advanced signal processing technology and a high-speed signal processing chip. It breaks through the influence of container wall thickness. Realizes the height of the liquid level in the closed container True non-contact measurement.

The ultrasonic liquid level sensor (probe) is installed directly under the outer wall (bottom) of the container under test. Calibrate the outer wall of the probe. There is no need to open holes for the container to be tested, easy to install, and does not affect production.

It can accurately measure the level of various toxic substances, strong acids, strong alkalis, and various pure liquids in high-pressure airtight containers.

The HS-2000 External Mounted Ultrasonic Tank Level Sensor has no special requirements for the material of the liquid medium and the container. The explosion-proof design is adopted to meet the explosion-proof requirements.

Features of HS-2000 Ultrasonic Tank Level Sensor

  • Non-contact measurement function ——– Ultrasonic sensor probe is external. No need to open a hole in the container to be tested.
  • Auto-calibration function——–With self-calibration function. It overcomes the problem of reduced accuracy after the long-term use of traditional liquid level gauges.
  • Infrared online debugging function——–Applicable to occasions where it is not suitable to open the cover for testing in dangerous situations. At the same time, it reduces the difficulty of debugging.
  • Self-diagnosis function——–It has its own working status diagnosis function. It also has a hardware diagnosis function. It enhances the reliability and stability of the level gauge.
  • One-key recovery function——–When the external measuring level gauge works abnormally, it can be restored to the normal state with one key through the debugger.
  • Local display and remote transmission function——–The level gauge can not only display the level value on the spot in time. But also remotely transmit it to the control room through the signal line.

Specifications of HS-2000 Ultrasonic Tank Level Sensor-External Mounted

Measuring range3m, 5m, 10m, 20m, 30m
Display resolution1mm
Short time repetition1mm
Measurement error±1‰FS (Excessive wall thickness and   temperature/pressure instability may affect measurement precision.)
Span shift±10 m
Current output4~20mA,Max   load 750Ω
Communication interfaceRS-485,    IrDA
Operating ambient temperature for liquid level meter-30℃~+70℃
Operating ambient temperature for ultrasonic probe-50℃~+100℃
(Probes with a wider temperature range can be provided upon request)
Operating ambient humidity15%~100%RH
Explosion proof markEx d ⅡC T6 Gb
Housing ingress protectionIP 67
Volume percentage display4-digit OLED display
Blind areaThere is a small blind area for the   liquid level meter that should be noted

Mediums that Ultrasonic Tank Level Sensor can measure

Liquefied GasLiquid AmmoniaDimethyl etherLiquid ChlorineHydrochloric Acid
PropyleneAqua CarbolisataLacquer ThinnerMTBEDimethylhydrazine
Nmethyl anilinejuButadieneChlorethyleneLight HydrocarbonBromine
Anhydrous Hydrogen FluorideTolueneMethylamineGasolineC3
Liquefied Carbon dioxideXylolCarbon DichlorideEpoxyethaneAcetone
Plant OilEthanolFreonDiethyl EtherDiesel
EthyleneSulfuric AcidMethanolKeroseneNitric Acid
And More……..

Ultrasonic Tank Level Sensor’s Application

  • Petrochemical industry
  • Chemical industry
  • Foodstuffs
  • Pharmaceutical industry
  • Marine industry
  • Oil refining industry
  • Refrigeration industry

Extended reading: Fuel-Diesel-Water Tank Level Sensor Monitoring

Chemical industry.
Common medium: liquid ammonia,liquid chlorine, hydrochloric acid, bromine, 
chlorethylene,sulfuric acid, freon, and nitirc acid.

Coal chemical industry 
Common medium: freon,liquid ammonia, butadiene, H2S.

Petrochemical industry.
Common medium : liquefied gas, propylene, ethylene, butadiene, light hydrocarbon, C3. 

Power, food, pharmaceutical industries and so on.  

Extended reading: Radar Oil Tank Level Sensor

ultrasonic tank level sensor application

In addition to measuring tank level, we also provide Portable Ultrasonic Water Depth Gauge for water depth measurement.

External Ultrasonic Tank Level Sensor Working Principle

External Ultrasonic Tank Level Sensor Working Principle

The External Ultrasonic Tank Level Sensor adopts the sonar echo ranging principle. It overcomes the influence of the tank wall on the transmission of ultrasonic signals. It adopts advanced digital signal processing technology. It can truly realize non-contact, high-precision measurement of the liquid level in the tank.

The External Ultrasonic Tank Level Sensor can output 4-20mA standard signals or output the measurement results to the upper computer (or secondary meter) through the RS-485 interface. It can meet the automatic control of the system.

Extended reading: The Secret of Ultrasonic Level Measurement

Application Requirement

1.Medium’s Purity Degree
Liquids should not contain dense foam
There should be minimal suspended objects in the liquid, such as crystallized particles, etc.
There should be minimal precipitation in the tank, such as mud, sand, etc.

2.Tank Material:Carbon steel, stainless steel. Various hard metals. Glass fiber-reinforced plastics. Epikote, rigid plastics, ceramics. Glass, ebonite. Other composite materials.

3.Tank Shape:Spherical, horizontal and vertical tanks are permitted.

If you need to measure river water level, open channel level, etc. The Ultrasonic Liquid Level Sensor can be used for non-contact continuous level monitoring.

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

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

Read more about: 5 Industrial Propane Tank Level Indicators

Oil level sensor is very important for monitoring the level of oil tank/fuel tank. Ultrasonic Oil Level Sensor is mainly used for monitoring the level of truck oil tank. Oil level display and transmit.

Read more about: Ultrasonic Oil Level Sensor-External Paste-Truck Fuel Tank

Ultrasonic Water Level Sensor refers to the ultrasonic level sensor used to measure the water level. Used for industrial liquid tanks, or river water level non-contact monitoring and control.

Ultrasonic Water Level Sensor is also often called “Ultrasonic Level Sensor”, “Ultrasonic Level Detector”, “Ultrasonic Level Sensor 4-20ma” or “Ultrasonic Level Transmitter” “Ultrasonic liquid level sensor”

Read more about: Ultrasonic Water Level Sensors

The Non Contact Liquid Level Sensor is not in contact with the measured medium. The Non Contact Liquid Level Sensors provided by Sino-Inst are not Gravity Non-contact Liquid Level Sensors. It is the liquid level sensor used in industrial tanks, reservoirs and open channels. There are mainly ultrasonic level sensors and radar level sensors.

Read more about: Non Contact Liquid Level Sensor

Read more about: Top 5 Ultrasonic Level Sensor Applications

How to Choose an Ultrasonic Tank Level Sensor?

To choose a suitable Ultrasonic Tank Level Sensor, users need to understand their measurement conditions and needs.

  • Are you measuring a liquid or bulk material?
  • What is the size of the tank? What level measurement range do you need?
  • Is the location classified as a Hazardous Location or Explosive Atmosphere?
  • Point level or continuous measurement?
  • Will the material coat or buildup on surfaces?
  • Does turbulence, foam, or vapor occur at the surface of the liquid?
  • What kind of output will you need?
  • Installation location and installation size?

Extended reading: Guide to Ultrasonic Level Transmitters

Ultrasonic tank level bottom sensor

The ultrasonic sensor (probe) is installed at the bottom of the tank’s external surface without the need for drilled holes in the tank. This allows for quick, simple installation that does not interrupt the tank’s operation.

Ultrasonic tank level bottom sensor

External Ultrasonic Tank Level Sensor Installation

There are 4 holes on the base of the main body. It can be fixed in different positions by bolts. The user can decide according to the working site.

When the instrument host is installed, it is recommended to use the instrument protection box in areas with relatively low temperature to prevent the instrument temperature from being too low.

In areas with high temperature, the instrument should be installed in a cool place to avoid excessive temperature in the instrument caused by exposure.

The display screen of the main unit of the instrument cannot be exposed to sunlight for a long time.

For iron containers, you can apply silicone grease to the working surface of the sensor and use a magnetic suction cup to directly tightly attach it to the bottom of the container.

If the container shell is made of glass and other materials, the sensor can be pasted and fixed with glue or fixed to the bottom of the container with a bracket.

  • The direction of the sensor must be perpendicular to the measured liquid level.
  • There are no obstructions such as coils directly above the sensor;
  • Keep away from the liquid inlet at the bottom of the tank to avoid the influence of the violent flow of the liquid on the measurement;
  • Keep away from the position below the liquid inlet on the top of the tank. Avoid the impact of the liquid inlet and the violent fluctuation of the liquid level to affect the measurement;
  • It is higher than the liquid outlet or the sewage outlet. To avoid the influence of long-term deposits on the bottom of the tank on the measurement. If the conditions are not met, measures should be taken to ensure that the bottom of the tank is regularly removed;
  • When the liquid level sensor is installed by magnetic or welding/adhesive fixing method. The installation surface size on the container wall should not be less than the round surface of ∅80. The surface roughness should reach 1.7. The inclination should be less than 3° (except the bypass pipe).

Horizontal tank: choose a position inside the tank bottom support and far away from the liquid inlet

Installation of Ultrasonic Tank Level Sensor in Horizontal Tank
Installation of Ultrasonic Tank Level Sensor in Horizontal Tank

Spherical tank:

For new tanks, if the manhole flange is not planned to be opened in recent years, and there is few liquid deposits, it is best to install it on the manhole flange. Because of the surface level, the signal is strongest.

Installation of Ultrasonic Tank Level Sensor in spherical tank
Installation of Ultrasonic Tank Level Sensor in spherical tank

When opening the inlet flange, remove the liquid level sensor first. After the inlet flange is installed and fixed, the liquid level sensor can be reinstalled.

If the deposits are not cleaned for a long time, a large amount of deposits may accumulate on the inner surface of the flange. In this case, the sensor installation position that can work stably for a long time is a circle around the manhole flange.

Here, the level is small, the sediment is small, and there is no rapid liquid flow interference. Although the signal for the new tank without sinking is not strong on the flange, it works stably for a long time.

Vertical tank:

Generally, choose the installation groove far from the liquid inlet and outlet (more than 90°).

Installation of Ultrasonic Tank Level Sensor in Vertical Tank
Installation of Ultrasonic Tank Level Sensor in Vertical Tank
Installation of Ultrasonic Tank Level Sensor in Vertical Tank with a bypass pipe
Installation of Ultrasonic Tank Level Sensor in Vertical Tank with a bypass pipe

For spherical tanks equipped with a calibrator. The calibration sensor is installed at the center of the calibrator on the outer wall of the tank.

If the calibrator is not installed, the calibration sensor should be installed at the height of the outer radius of the tank (equatorial zone).

The calibration sensors for the vertical tank and the process tank are installed on the outer side of the tank body, at a height of 0.5m to 1m from the tank bottom.

Note: After installing the calibration tube (calibrator) in the tank, the correct installation position should be marked with paint on the outside of the tank wall in time.

Extended reading: ultrasonic level sensor for diesel tank

Featured Tank Level Sensors


When the ultrasonic liquid level sensor is working, the high-frequency pulse sound wave is emitted by the transducer (probe). It is reflected on the surface of the measured object (water surface). The reflected echo is received by the same transducer (probe) and converted into an electrical signal . The time between sending and receiving 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 the transmission time t can be expressed by the formula: s=cⅹt/2
Acoustic wave is a kind of media that transmits information. It is closely related to mechanical vibration. The mechanical vibration produced by the impact and movement of objects spreads outward in the form of waves. According to the frequency of the wave generated by the vibration, it is divided into audible sound waves, infrasound waves and ultrasonic waves. The sound waves higher than 20khz are called ultrasonic waves.

Yes, of course the water level can be measured with an ultrasonic level sensor.
For water depth detection, the water depth calculation can be found through the distance between the ultrasonic sensor transceiver and the water surface. The sensor will send a short ultrasonic pulse and measure the propagation time of the pulse to the liquid and back. Then calculate the total depth of the water tank and subtract this distance to determine the water depth.
This method of measuring with ultrasonic sensors more accurately describes water level measurement.
Read more about: Water Tank Level Sensors for Level monitoring and Auto-control

If the tank has an opening, we can use an integrated ultrasonic level sensor.
If the tank level signal needs to be transmitted remotely, we can use a split ultrasonic level sensor.
If the tank cannot be opened. You can use External Mounted Ultrasonic Tank Level Sensor.
If the tank is small, such as a CO2 tank, a portable ultrasonic level indicator can be used.

An ultrasonic sensor sends sound waves to the water in the tank. When the waves bounce back, the sensor measures the time it took. It then calculates the distance, showing how much water is in the tank.

The “ultrasonic level” of a tank refers to the measurement of the tank’s contents. This is done using sound waves from an ultrasonic sensor.

There are several ways to measure tank level. One of the best is using an ultrasonic sensor. It’s reliable, safe, and doesn’t need to touch the liquid in the tank. Other methods can include radar level sensors and pressure transducers, but the best choice depends on the specific application.

More Level Measurement Solutions

Sino-Inst offers over 10 Ultrasonic Tank Level Sensors for level measurement. About 50% of these are fuel level meters, 40% is the tank level sensor.

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

Sino-Inst is a globally recognized supplier and manufacturer of Ultrasonic Tank Level measurement instrumentation, located in China.

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