• Clamp-on installing, no-direct-touching to liquid of container and pipe.
  • LED indication for level status
  • Electronic structure,no mechanical working way,longer working life
  • High stability,high sensitivity,good anti-interference for complicated environmental application.
  • NPN /PNP output way for different control wire.
  • Suitable for water, alcohol, acid, alkaline, etc and powdery particle
  • Suitable for non-metal material containers and pipes
  • Wide power supply

Non-contact level sensor is designed to provide clamp on level measurement for non-metal container and  non-metal pipe/tube, and typical containers contain various of tank/vessel,etc. With our patented technology, the liquid level sensor can detect level inside from external surface of containers. That means it won't contact liquid and don't need to open closed container or cut it. Thus, it doesn't pollute the liquid. The non-metal material can be plastic, glass,ceramics,etc,and typical non-metal containers mainly have tank,pipe,bottle,barrel,drum,etc.

The non contact liquid level sensor is developed on advanced signal process technology by high speed signal process chip. It can measure liquid level of closed container by penetrating the wall of container. The liquid level sensor is usually fixed on the vertical side of non-metal container, and doesn't need to cut holes. It is easy to install and don't stop manufacturing. It can still work well even though the containers have various of poisonous materials,strong acid, strong alkali,etc.

With low cost and good performance, the non contact water level sensor switch has been widely used in water tower, pipe, water tank, environment protection device, medical device, close-stool, whirlpool tub, coffee machine maker, water dispenser, etc.


  • Home Appliances
  • Beauty SPA equipment
  • Bathroom Intelligent Control
  • For drinking water and water purification
  • Medical and food equipment
  • Chemistry equipment
  • Aquaculture


  • Induction container wall thickness: 1-18mm;
  • Power supply: 5-24VDC
  • Current consumption: 5mA
  • Response time:50S
  • Environment temp.:0 - 85 Deg.C
  • Max output current: 1-50mA
  • Output way: NPN,PNP,High/Low electric level,RS485 optional
  • Output voltage(high electric level):InVCC
  • Output voltage(LOW electric level):0V
  • Protection class: IP67
  • Induction surface material: ABS
  • Relative humidity:5%-95%
  • Dimension:28x16.9mm(check the picture below)

Ultra Miniature Non Contact Water Level Sensor

Very Low Cost and Very Small Size

Miniature non contact water level sensor is designed for project with ultra small size and low price. Its structure is compact and flat that is different from the white version above. The flat structure makes it easy to fix tightly. It is more suitable for water and similar liquid. It is used for non-metal containers,e.g. plastic, glass,etc. Its cable and connector can be made as requirement. The non contact water level sensor has been widely used for many projects.

The non contact water level sensor provides single point level measurement and monitoring with high/low electric level output. When detect the level from external container wall, it directly produces 0V low electric voltage, when no level is found,it produces 5V high electric level. One piece of level sensor is used to monitor one single point level. If you want to high and low level, please use two pieces: one is for low level,the other is for high level. The non contact water level sensor doesn't need special MCU to produce electric level signal,and the level sensor itself can send it too. This can reduce your time and cost.

Technical Specification

  • Level accuracy:+/- 1.5mm;
  • Power supply voltage:4V-5VDC
  • Max container wall thickness:2.5-3.5mm(Plastic container,if other material, the value may vary)
  • Current consumption: 100mA
  • Power consumption: 200mA
  • Working temperature: -20-+70 Deg.C.
  • Output way: High/Low electric level
  • Output voltage(high electric level):True value:0. Output voltage:<0.3mA. Output current:<10mA
  • Output voltage(LOW electric level):True value:1. Output voltage:<Vcc. Output current:<20mA
  • Induction surface material: ABS
  • Relative humidity:5%-95%
  • Protection class: IP62
  • Dimension: 22x13x4.5mm (only sensor without cable,width doesn't include fixing hole)

Non Contact Level Switch for Solid

Except used for liquid,e.g. water,etc, the level sensor switch can be used for solid level measurement,which mainly includes particles and powder. The following picture is used for bean level monitor.non-contact-level-sensor-switch-solid


Non Contact Solution for Water Tank Level Sensor Switch

   (Non Contact Level Test for Closed Tank by Side Vertical Tube)

The series of non-contact level sensors can provide external level control for water tank or liquid tank. The sensors can be used for small size tanks or bigger tank vessel. If the tank container is non-metal, users can directly attach the level sensor onto the external surface. If the tank is metal material, users can add a vertical plastic tube against the metal water tank.

Take the picture above as example,water tank is stainless steel, and the non contact liquid level switch can't be directly used for the closed tank. The project mainly have 2 requirements as below:

(1). The level sensor can't touch the water inside closed tank

(2). The level sensor should be low price solution.

By the requirements, we firstly eliminate ultrasonic level sensor and rade level transmitter. Then we recommend our economic clamp on ultrasonic level detector,but they still regard the price was a little higher. The whole project will require plenty of the level sensors. So the customers agree to add a vertical plastic tube outside of the tank. Then our non contact level sensor is used to monitor high/low level for the water tank.

Of course, in order to meet more requirement for metal tank, we also have released ultrasonic clamp on level detector and controller. With that clamp on level, users don't need to add a plastic tube that means no cutting is required to your metal tank. If you want to measure liquid level in metal container, please visit  clamp on ultrasonic level controller.

Then It can be used to measure level and flow of tubes.The tube diameter shouldn't be less than 10mm. Pipe material is non-metal,e.g.plastic,PVC,glass,rubber,acrylic,ceramics(no water absorbent),etc. The non-contact level flow switch is low cost solution.


  • Level accuracy:+/- 1.5mm;
  • Power supply: 5-24VDC
  • Current consumption: 5mA
  • Response time:50S
  • Environment temp.:0 - 85 Deg.C
  • Max output current: 1-100mA
  • Output way: NPN,PNP,High/Low electric level optional
  • Output voltage(high electric level):InVCC
  • Output voltage(LOW electric level):0V
  • Protection class: IP67
  • Induction surface material: ABS
  • Relative humidity:5%-95%
  • Dimension:28x16.9mm(check the picture below)

Application condition for pipe(liquid):

  • Dynamic viscosity<10mPaS, normal measurement.
  • 10mPaS<Dynamic viscosity<30mPaS, test may be effected.
  • Dynamic viscosity>30mPaS, can't measure.

Note: As the temperature becomes higher, the viscosity is down.Most of high viscosity liquid are easily effected. Please pay attention to temperature changing while measuring viscosity liquid.

Sensitive (Pipe size&Pipe wall thickness)


Get More Tank Level Sensor

For more tanks, there are more different types of tank level sensors. The following are often used advanced tank level sensors:

  • Ultrasonic Level Sensor/Transmitter
  • Radar Level Transmitter
  • capacitive tank level sensor
  • Magnetostrictive liquid level meter