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Level Sensor

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Industrial Capacitive Water Level Sensor, 0-900mm

$326.53
SKU: ATO-LEVS-900
Industrial capacitive water level sensor adopts the capacitive detection principle and uses a coaxial container and shell to combine the inner and outer electrodes, available in measuring ranges of 0 to 900mm. Capacitive water level sensor is easy to install and use, with signal output of 4~20mA, 0~5VDC, RS485 or RS232. This non-contact capacitive liquid level switch can be widely used in water conservancy, environmental protection and electric power.

26 GHz Radar Level Transmitter, Non-contact, 0-30M, 4-20mA/RS485

$1,452.09
SKU: ATO-LEVS-RD902
Economical price radar level sensor is a non-contact measurement. Measuring range from 0 to 30m, selectable output signal of 4-20mA, RS485 or 4-20mA+HART, power supply of DC 12-24V or AC 220V, installation of G1-1/2"A thread or flange. Radar type level transmitter consists of protection head with LCD display, 26 GHz microwave frequency, waterproof connectors, internal radar antenna, horn and installation accessory for measuring various highly corrosive liquids.

Capacitance Level Sensor for Oil Tank, 0-1000mm

$311.59
SKU: ATO-LEVS-1000
High performance capacitive level sensor has signal output 4-20mA, 0-5VDC, 0-10VDC, MODBUS, power supply 9 ~ 30VDC, 15 ~ 30VDC, measuring range from 0 to 1000mm. The oil tank level sensor has an IP65 protection rating and can operate in a wide temperature range of -20 to +85℃. ATO capacitive level transmitter can be put in oil tank for liquid level measurement.

Submersible Level Sensor for Water/Oil/Fuel Tank, 0-200M

$173.28
SKU: ATO-LEVS-S200M
Submersible level sensor adopts 304 stainless steel housing and waterproof cable, can be put in water/oil/fuel tank or reservoir directly for liquid level measurement. The measuring range can be 0-1m/0-3m/0-5m/0-10m ~ 0-200m. Liquid level sensor has optional accuracy 0.5%FS or 0.3%FS, output signal 4-20mA/0-5V/RS485, power supply DC 24V/12V. The cable type and connection type are also customizable.

Ultrasonic Level Sensor for Water/Fuel/Oil/Powder, 0-60M

$423.28
SKU: ATO-LEVS-U60M
Ultrasonic level sensor has integrated structure and mainly consists of LCD display, ultrasonic probe and waterproof connector. Ultrasonic liquid level sensor features an LCD display with IP65 protection and an ultrasonic probe with IP68 protection, suitable for various industrial and outdoor applications. The measuring range can be from 0-5m, 0-10m, 0-15m, 0-20m to 0-60m. The output signal can be 4-20mA or RS485/232. Ultrasonic level sensor also has optional power supply DC 24V or AC 220/50Hz.

80 GHz Radar Level Transmitter, Non-contact, 10-60M, 4~20mA/RS485

$1,555.86
SKU: ATO-LEVS-WSR550
High frequency 80 GHz radar level sensor is a non-contact radar type level transmitter that can detect solid powder and liquid materials, available with optional 10m to 60m wide range, 24V DC or 220V AC power supply, 4-20mA/RS485/HART output, 3°/8°/20° beam angle and threaded or stainless steel flanged connection. It has an IP67 protection rating and is dust and water resistant.

Capacitance Level Sensor for Diesel & Hydraulic Oil, 0-2000mm

$470.69
SKU: ATO-LEVS-2000
Reasonable price capacitive liquid level sensor for diesel and hydraulic oil, measuring range from 0 to 2000mm. This level transmitter has optional signal output 4-20mA, 0-5VDC, 0-10VDC, power supply 9 ~ 30VDC, 15 ~ 30VDC. The capacitance oil level sensor uses optional direct wire or M12 connector connection methods and has an IP65 protection rating.

Ultrasonic Level Sensor for Tanks, Output 4-20mA/1-5V/RS485, 0-40M

$475.98
SKU: ATO-LEVS-U40M
Ultrasonic level sensor has high accuracy 0.3%FS and measuring range 0-5m, 0-10m, 0-15m to 0-40m. It also adopts integrated structure and mainly consists of OLED display, waterproof connectors and ultrasonic probe. Ultrasonic tank level sensor using advanced non-contact ultrasonic measurement technology can be used for liquid/solid/powder level of tapered/spherical tank, tapered feed outlet tank, sewage tank, river, lake, etc. It has optional output signal 4-20mA, RS485, HART, 2 relays or 3 NPN, optional power supply DC 12-16V, DC 24-28V, AC 220V or built-in battery.

120 GHz Radar Level Sensor for Well, 0-15M, RS485

$1,998.73
SKU: ATO-LEVS-LD
Radar level sensor has a frequency range of 120 GHz, it delivers high accuracy of ±3mm and includes IP68-level. The radar level transmitter outputs data via RS485 and supports calibration through Bluetooth/Modbus protocol. It has angle compensation and temperature compensation, operates on a 3.6V or 12V power supply. Applications in river channels, wells, lakes, and front shoals.

Capacitive Liquid Level Sensor, for 8-11 mm Pipeline Level Detection

$179.12
SKU: ATO-LEVS-CE10
High quality and good price capacitive liquid sensor for sale online. This liquid level sensor with short circuit protection, overload protection and reverse polarity protection. The applicable temperature of capacitive fluid level sensor between -10 ℃ and 55 ℃. Capacitive type level sensor often used in capacitive liquid level detection in pipe diameters.

Capacitive Liquid Level Sensor, for 12-26 mm Pipeline Level Detection

$180.67
SKU: ATO-LEVS-CE15
Capacitive water level sensor with IP67 protection rating. The sheating material of capacitance probe level sensor is PBT. Capacitive level sensor can detect the non-metallic media in the container directly through the non-metallic tube wall. The switching frequency of this level sensor is 60 Hz. The ambient temperature range of this capacitive level sensor is -10℃ to 55℃, and the ambient humidity range is 35% to 95%RH.

Radar Liquid Level Sensor, Non-contact, 0-20M, 4-20mA/RS485

$1,563.49
SKU: ATO-LEVS-RD902T
Economical price radar level sensor is a non-contact liquid measurement. Measuring range from 0 to 20m, selectable output signal of 4-20mA, RS485 or 4-20mA+HART, power supply of DC 12-24V or AC 220V, installation of DN80, DN100 or DN150 flange. Radar level transmitter consists of protection head with LCD display, waterproof connectors, internal radar antenna, horn and installation accessory for measuring various liquids.

High Temperature Level Sensor, 4-20mA/0-5V/0-10V, 0-20M

$306.89
SKU: ATO-LEVS-HT20M
High temperature level sensor adopts separated structure and consist of 316L stainless steel gas collector, 316L stainless steel capillary tube and protection head. Water/oil/fuel tank level sensor can be used in high temperature (-40~+150℃/ -40~302℉) or corrosive liquid. The measuring range can be 0-1m/0-3m/0-5m/0-7m/0-10m/0-12m ~ 0-20m. High temperature liquid level sensor has optional output signal 0-20mA/4-20mA/0-5V/1-5V/0-10V, optional accuracy 0.5%FS or 0.3%FS and power supply DC 24V/12V.

Non Contact Ultrasonic Level Sensor for Water Tank, 0.5-1.5M

$725.99
SKU: ATO-LEVS-15
The non-contact ultrasonic liquid level sensor supports DC12~48V voltage, protection level up to IP67, dustproof and waterproof. Ultrasonic liquid level sensor can provide stable liquid level data within a range of 0.5 meters to 1.5 meters, can be installed outside the bottom of the water tank to measure the liquid level height, and communicate with the system through the RS232/RS485 interface.

Radar Water Level Sensor, Non-contact, 0-70M, 4-20mA/RS485

$1,727.96
SKU: ATO-LEVS-RD909
Radar water level sensor using advanced non-contact radar measurement technology has measuring range from 0-30m, 0-70m, optional output signal 4-20mA, HART, RS485/232 and optional power supply DC 12-24V, AC 220V. Radar level transmitter consists of protection head with LCD display, waterproof connectors, internal radar antenna, horn and installation accessory, can be used for measuring liquid level of reservoir/ river/ lake/ water tank.

Radar Level Transmitter for Corrosive Liquid, Non-contact, 0-10M

$1,337.79
SKU: ATO-LEVS-RD901
Radar level sensor is a non-contact measurement for measuring various corrosive liquids. The measuring range of the level sensor is 0 to 10 meters, with optional output signals: 4-20mA, RS485 or 4-20mA+HART, and power supply: DC 12-24V or AC 220V. Radar level transmitter consists of protection head with LCD display, waterproof connectors, internal radar antenna, and installation accessory.

Radar Level Sensor for Corrosive Liquid, Non-contact, 0-20M

$1,732.89
SKU: ATO-LEVS-RD906
Factory price radar level sensor is a non-contact measurement for measuring various highly corrosive liquids. Measuring range from 0 to 20m, selectable output signal of 4-20mA, RS485 or 4-20mA+HART, power supply of DC 12-24V or AC 220V, flange installation of DN50~DN200. Radar level transmitter consists of protection head with LCD display, waterproof connectors, internal radar antenna, and installation accessory.

Radar Level Sensor for Solid, Non-contact, 0-12M, 4-20mA

$1,796.39
SKU: ATO-LEVS-RD905
Economical price radar level sensor is a non-contact measurement. The non-contact level sensor supports a measuring range of 0–12m or 0–15m for powder, 0–18m or 0–20m for granules, and up to 20m for chunks, with output options of 4–20mA, RS485, or 4–20mA+HART. It can be powered by DC 12–24V or AC 220V. Radar level transmitter consists of protection head with LCD display, waterproof connectors, internal radar antenna, horn and installation accessory for measuring various solids.

Radar Level Transmitter for Solid, Non-contact, 0-40M, 4-20mA

$1,891.59
SKU: ATO-LEVS-RD903
Radar level sensor is a non-contact solid measurement at factory price. The electronic level sensor offers a measuring range of 0–10m, 0–20m, or 0–35m for powders; 0–12m, 0–25m, or 0–40m for granules; and 0–15m, 0–25m, or 0–40m for chunks. It supports selectable output signals of 4–20mA, RS485, or 4–20mA+HART, power supply of DC 12-24V or AC 220V, installation of DN80, DN100 or DN125 flange. The level sensor features an aluminum shell, a 304 stainless steel process connection, and a 304 stainless steel horn.

Radar Level Sensor for Solid, Non-contact, 0-50M, 4–20mA

$2,145.59
SKU: ATO-LEVS-RD904
Affordable price radar level sensor is a non-contact solid measurement. Radar level transmitter consists of protection head with LCD display, waterproof connectors, internal radar antenna, and installation accessory. The level sensor offers a measuring range of 0–30m or 0–45m for powders, and up to 50m for granules and chunks. Radar level sensor supports selectable output signals of 4–20mA, RS485, or 4–20mA+HART, with power supply options of DC 12–24V or AC 220V. It features flange installation and a resolution of 1mm.
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What is a level sensor?

High-quality ATO level sensors is for sale, and we offer various types and functions of level sensors. A level sensor is a device used to detect and measure the height of liquid or solid materials, widely used in industries such as industrial automation, petrochemicals, water treatment, food and beverage, and pharmaceuticals. It can not only monitor the liquid level height in real time, but also detect other media such as oil, sewage, rainwater, etc., and transmit the data to the control system to achieve automation control, improve production efficiency, and prevent overflow or drying problems.

Working principle of level sensor

Level sensors detect the level of liquids and other fluids and fluidized solids, including slurries, granular materials, and powders that exhibit an upper free surface. Substances that flow become essentially horizontal in their containers (or other physical boundaries) because of gravity whereas most bulk solids pile at an angle of repose to a peak. Level sensors can be divided into two categories based on different measurement principles: contact type and non-contact type. Contact type level sensor: It directly contacts the liquid and other fluids measures the level through float, capacitance, conductivity, radar and other methods. For example, a float level sensor uses the float to change its electrical signal as the level rises and falls, thereby detecting the height of the level. Non contact level sensor: using technologies such as ultrasound, radar, or laser, the level can be calculated through reflected signals without direct contact with the measuring object. For example, an ultrasonic level sensor determines the level by measuring the time difference between the ultrasonic pulse from the sensor to the level.

The main types of level sensors

Level sensors are mainly divided into two types based on whether they touch the measured material:

  • Contact Type: The sensor touches the liquid directly. Common examples include float, electrode, and capacitive sensors.
  • Non-Contact Type: The sensor measures the level from outside, without touching the liquid. These are used in harsh or dangerous environments, like corrosive or high-temperature liquids.

Common Contact-Type Level Sensors

  • Float Type (Float level sensor): A float rises or falls with the liquid level, triggering a switch. Simple and widely used in water or oil tanks.
  • Conductive Type (Electrode level sensor): Uses the conductivity of the liquid to complete a circuit between electrodes. Best for water or other conductive fluids.
  • Capacitive Type (Capacitive level sensor): Detects changes in capacitance caused by the liquid level. Works well with various liquids, including corrosive ones.
  • Optical (Photoelectric) Type: Uses light refraction or reflection to detect if liquid is present. Good for small tanks or precision needs.

Common Non-Contact Level Sensors

  • Ultrasonic Level Sensor: Emits ultrasonic waves and measures the echo time to determine the level. Ideal for water, chemicals, or bulk solids.
  • Radar Level Sensor: Sends microwave or radar signals to the surface and measures the return time. Suitable for extreme conditions like high temp or pressure.
  • Laser Level Sensor: Uses laser beams for distance measurement. Offers very high accuracy for clear or transparent liquids.
  • Magneto strictive Sensor: Uses magnetic fields and waveguides for ultra-precise and stable level detection. Common in oil, fuel, and chemical tanks.

Application areas of level sensors

  • Water treatment industry: Used for water level monitoring of water tanks, water pools, sewage treatment, etc.
  • Petrochemical industry: Monitor the liquid level of oil tanks and chemical storage tanks to prevent overflow or drying up.
  • Food and pharmaceuticals: Ensure precise control of liquid raw materials during the production process to improve product quality.
  • Industrial manufacturing: Used for level detection on automated production lines to improve production efficiency.
  • Agricultural irrigation: Used for water level monitoring and automated control of irrigation systems.

Level sensors play a crucial role in modern industry and daily life, improving production efficiency, reducing costs, and ensuring safe operation. Choosing the appropriate level sensor based on specific application requirements will help achieve more accurate level monitoring and intelligent control. If you have any questions about purchasing, you can contact us.