Level Sensor

ATO Level Sensor Selection Guide

Choosing the right level sensor depends on several key factors, including the type of measured medium, required measuring range, monitoring mode, working conditions, installation method, and compatible output signal.
ATO offers a wide range of level sensors, including capacitive, submersible, ultrasonic, radar, optical, tuning fork, and rotary paddle types. Each technology is designed to meet different application needs and environmental conditions.
These sensors are widely used in industrial storage tanks, water treatment systems, chemical processing, grain silos, hydraulic systems, and various liquid or solid level monitoring applications. Proper selection helps ensure accurate measurement, stable operation, and reliable long-term performance.

Quick ATO Level Sensor Selection Table

This table helps users compare ATO level sensors by different output options, including 4–20mA, 0–5V, 0–10V, RS485 Modbus, and switch signals. Selecting the appropriate output type ensures accurate measurement, stable performance, and reliable process monitoring across a wide range of industrial applications.

Capacitive Level Sensor
Capacitive level sensors detect the liquid level by measuring changes in capacitance between the sensor plates. When the liquid replaces air between the plates, the capacitance changes, reflecting the liquid height in the tank. They are compact, accurate, and cost-effective.

Submersible Level Sensor
Measures the liquid level by detecting hydrostatic pressure when submerged in the liquid. Ideal for deep tanks, water treatment, chemical storage, and sealed containers. Provides continuous and reliable measurement, resistant to harsh conditions.

Ultrasonic Level Sensor
Uses ultrasonic waves to measure the distance to the liquid surface. Non-contact design is safe for corrosive or hazardous liquids. Suitable for large tanks, wastewater, and industrial chemical storage.

Rotary Paddle Level Switch
A rotating paddle stops when it is obstructed by solids, triggering a switch. Commonly used in silos, hoppers, and bulk solid storage. Ideal for point-level detection to prevent overfill or empty conditions.

 
Optical Level Sensor
Optical level sensors detect liquid presence using light reflection or refraction. They are compact with a fast response, suitable for point-level detection in small tanks, laboratory instruments, and medical liquid monitoring.

Electromagnetic (Radar) Level Switch
Electromagnetic radar level switches use microwave signals to detect the presence or absence of liquid. They work reliably in harsh conditions, including vapor or dust, and are ideal for high-pressure or high-temperature industrial tanks.

Vibrating (Tuning Fork) Level Switch
Vibrating tuning fork level switches detect liquids or solids by a frequency change when the vibrating element is covered. They are reliable, work with foam, sticky liquids, or powders, and are suitable for silos, hoppers, and point-level detection to prevent overfill.

Rotary Paddle Level Switch
Rotary paddle level switches have a rotating paddle that stops when obstructed by solids, triggering a switch. They are commonly used in silos, hoppers, and bulk solid storage and are ideal for point-level detection to signal full or empty conditions.

Key Considerations in Selecting ATO Level Sensors

To select the most suitable ATO level sensor for industrial level measurement, follow a structured decision process based on medium, measurement method, environment, and system requirements.

Step 1: Identify the Measured Medium
Determine the type and physical properties of the measured material.
Common media types include:

• Liquids (water, oil, chemicals)
• Slurries or sludge
• Powders or granular solids
  Key properties affecting selection: viscosity, density, conductivity, and corrosiveness.

Step 2: Determine Measurement Type
Select the required measurement mode based on application needs.

• Continuous Level Measurement: Provides real-time level monitoring (0–100%) for process control.
• Point Level Detection: Provides ON/OFF switching output for alarm, pump control, or overflow protection.

Step 3: Select Contact or Non-Contact Technology
Choose sensor type according to application conditions and medium characteristics.

• Capacitive Sensors: Suitable for general liquid level detection
• Submersible Sensors: Hydrostatic pressure-based measurement for deep or sealed tanks
• Ultrasonic Sensors: Non-contact measurement for large tanks or corrosive media
• Radar Sensors: High-precision measurement in high temperature, high pressure, vapor, or dust environments
• Optical Sensors: Compact detection for small equipment and low-level protection
• Tuning Fork Switches: Point-level detection for viscous, foam, or powder media
• Rotary Paddle Switches: Bulk solid level detection in silos and hoppers

Step 4: Evaluate Operating Environment
Assess installation and process conditions, including:

• Temperature range
• Pressure conditions
• Presence of vapor, foam, or dust
• Tank geometry and installation constraints
  Harsh industrial environments typically require radar or pressure-based sensing technologies for stable operation.

Step 5: Confirm Output Signal and System Integration
Ensure compatibility between sensor output and control system requirements.
Common output types:

• 4–20mA analog signal
• 0–5V / 0–10V voltage signal
• RS485 Modbus communication
• Relay/switch output
• Wireless transmission (optional)
  Integration targets: PLC, SCADA, DCS, and IoT-based control systems.
  
  

Industrial Application-Based ATO Level Sensor Selection Guide

Based on the above criteria, select the most suitable ATO level sensor according to different industrial scenarios.

For Conventional Water & Oil Storage
If you monitor regular water reservoirs, river water, or conventional oil storage tanks, choose stable and cost-effective capacitive level sensors.

• Recommended Models: ATO-LEVS-900, ATO-LEVS-1000, ATO-LEVS-2000
• Best for: Power plant water monitoring, industrial oil tanks, and generator fuel tanks with wide temperature adaptability and multi-signal output options.

For Deep Liquid & Sealed Container Detection
For deep wells, large sealed tanks, and corrosive liquid storage, select pressure-based submersible level sensors with strong environmental adaptability.

• Recommended Models: ATO-LEVS-S200M, ATO-LEVS-CYW71, ATO-LEVS-HT20M
• Best for: Deep water level monitoring, high-temperature liquids, and acid-base corrosive environments under harsh sealed conditions.

For Non-contact Large Tank Monitoring
Choose non-contact ultrasonic level sensors for hazardous, corrosive, or large-capacity chemical containers where direct medium contact is not suitable.

• Recommended Models: ATO-LEVS-05, ATO-LEVS-U40M, ATO-LEVS-U60M
• Best for: Sewage tanks, river channels, chemical storage, and mixed liquid systems requiring safe non-contact measurement.

For Bulk Solid & Granular Material
Use rotary paddle level switches for silos, hoppers, and bulk material storage to prevent overflow or material shortage.

• Recommended Models: ATO-LEVS-RD903, ATO-PLS-004
• Best for: Grain, powder, and bulk solid storage with reliable point-level alarm and anti-blocking performance.

For Foamy & Viscous Medium Detection 
Select tuning fork level sensors for sticky liquids, foam, and powder-like materials with stable frequency-based detection.

• Recommended Models: ATO-TFLS-501, ATO-VLS-YN100
• Best for: Industrial liquid tanks, powder silos, and overflow protection with strong anti-interference capability.

For High Pressure & Severe Industrial Conditions
Radar level sensors are suitable for high temperature, high pressure, vapor, and dusty industrial environments with stable microwave measurement performance.

• Recommended Models: ATO-ELS-040
• Best for: Harsh industrial tank monitoring, conductive liquid measurement, and complex vapor-filled conditions.

For Mini Equipment & Precision Liquid Protection
Compact optical level sensors are ideal for small machinery, laboratory equipment, and low-level liquid protection applications.

• Recommended Models: ATO-MR-M12
• Best for: Hydraulic systems, coolant monitoring, and compact equipment liquid level safety with a fast response time.
  
  

Quick Recommendation by Application

There are various types of level sensors designed for different applications and characteristics. Select the most suitable ATO level sensor type and model based on your specific industrial application to ensure accurate measurement and reliable control.

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.