Level Sensor

ATO Level Sensor Selection Guide

ATO level sensors are used for monitoring liquid or solid levels in tanks, reservoirs, and industrial storage systems. They provide continuous measurement or point-level detection for process control, alarms, and pump management.

Common Types of Level Sensors

Level sensing technologies fall into two primary categories: continuous (measuring the exact volume or height) and point-level (detecting an overflow or empty state). 

Continuous Level Measurement
Used for real-time level monitoring across the full range.

• Capacitive level sensor detects level changes based on electrical capacitance variation and is used for measuring liquids, chemicals, and powder materials in industrial tanks.
• Submersible level sensor is used for continuous liquid level measurement based on hydrostatic pressure in deep tanks, wells, and wastewater applications.
• Ultrasonic level sensor provides non-contact liquid level measurement using sound waves, making it suitable for water tanks, reservoirs, and corrosive or dirty media applications.
• Radar level sensor is used for high-accuracy industrial level measurement in harsh environments such as high temperature, pressure, vapor, and dust conditions.
• Wireless level sensor enables remote liquid level monitoring by transmitting measurement data via NB-IoT or cellular networks for IoT-based industrial systems.

Point-Level Measurement (Switching)
Point level measurement indicates when a product is present at a certain point, and continuous level measurement indicates the continuous level of a product as it rises and falls.

Quick ATO Level Sensor Selection Table

The table below provides a quick overview of different level sensor types to help you select the most suitable solution based on application and measurement requirements.

Continuous Level Sensors

Point-Level Sensors

Industrial Applications of Level Sensor

Level sensors are widely used for industrial level measurement and process control, ensuring safe, efficient, and accurate monitoring of liquids and solids across tanks, silos, and open environments.

How to Choose the Right Level Sensor

Selecting the right ATO level sensor depends on medium type, measurement method, operating environment, and system compatibility.

Step 1: Identify the Level Measured Medium
The measured medium determines sensor compatibility.

• Liquids: water, chemicals, acids, bases.
• Sludge or pastes: viscous or foamy liquids.
• Powders and bulk solids: granules, grains, or cement.
• Corrosive or sticky materials: require chemical-resistant sensors.

Step 2: Determine Measurement Type
Decide whether continuous measurement or point-level detection is required.

• Continuous Sensors provide exact, real-time level data (0–100%). Technologies include radar, ultrasonic, guided wave radar, capacitive, and submersible sensors.
• Point-Level Switches detect high or low levels and trigger alarms or pump control. Options include optical, float, vibrating fork, tuning fork, and rotary paddle switches.

Step 3: Select Contact or Non-Contact Technology
Installation conditions determine whether contact or non-contact sensing is required.

• Non-Contact Sensors (radar, ultrasonic) are used for corrosive, foamy, hygienic, or harsh environments.
• Contact Sensors (capacitive, submersible) are suitable for general industrial liquids and solids.

Step 4: Evaluate the Level Sensor Operating Environment

• Is your tank exposed to high temperature, high pressure, foam, vapor, or dust?
  → You need a robust radar or submersible sensor for reliable operation.
• Is the tank small, clean, or unobstructed?
  → An ultrasonic or capacitive sensor may be sufficient.

Step 5: Review Tank and Mounting Constraints
Before selecting the final sensor, consider the physical layout of your tank and installation requirements.

• Tank Height & Diameter: Ensure sensor range fully covers the material level.
• Obstructions: Avoid false readings from mixers, agitators, or internal structures.
• Mounting Type: Choose a sensor housing and mounting compatible with process and maintenance requirements.

FAQs

Q1: Radar vs Ultrasonic Level Sensor: Which One Should I Choose?
A: Use a radar level sensor for harsh environments and an ultrasonic level sensor for clean liquid applications.
Radar works best in vapor, foam, dust, high temperature, and pressure conditions, while ultrasonic is suitable for cost-effective water tank and reservoir monitoring.

Q2: Which ATO Level Sensor Is Best for Water Tanks?
A: Ultrasonic, submersible, and level switches are the best ATO sensors for water tanks.
Ultrasonic is used for non-contact measurement, submersible for deep tanks and wells, and level switches for overflow and pump control.

Q3: When should I use a submersible level sensor?
A: Use a submersible level sensor for deep tanks, wells, and underground liquid level measurement.
It is used in hydrostatic pressure-based applications where stable, continuous monitoring is required.

Q4: Which type of level switch is best for industrial use?
A: Tuning fork level switches are best for liquids, and vibrating rod level switches are best for powders and bulk solids.
They are used for reliable ON/OFF level detection in industrial control systems.

Q5: How do I choose between continuous and point-level sensors?
A: Choose continuous level sensors for real-time level measurement and point-level sensors for ON/OFF control.
Continuous sensors are used for process monitoring, while point-level sensors are used for alarms and pump protection.

Summary

Level sensors play a crucial role in modern industry and daily life, improving production efficiency, reducing costs, and ensuring safe operation.
Some level sensor applications can overlap, and when deciding on a sensor, it is important to identify the product that you are sensing and the type of feedback that your application requires. Sensors like tuning fork or optical level sensors can be used to indicate a high or low level. Ultrasonic and radar level sensors can measure your level to give specific feedback on how much product is in a tank. If you have any questions about purchasing, you can contact us.