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Accurately measuring liquid levels is crucial in numerous applications, from industrial processes to home aquariums. Selecting the right liquid level sensor ensures reliable performance, prevents overflows or dry runs, and contributes to overall system efficiency. This guide will help you navigate the key considerations for making an informed purchase.
The CQRobot non-contact liquid level sensor realizes non-contact detection of the liquid level in a closed container. It adopts advanced signal processing technology and high-speed signal processing chip, breaking through the influence of container wall...
The principle is to use the inductive capacitance of water to detect whether there is liquid. When there is no liquid close to the sensor, the sensor has a certain static capacitance to the ground due to the existence of distributed capacitance on the...
The changed capacitance signal is then input to the control IC for signal conversion, which converts the changed capacitance into a change of a certain electrical signal, and then a certain algorithm is used to detect and judge the degree of this change...
High stability, high sensitivity, strong interference ability, no external electromagnetic interference, special treatment for power frequency interference and common mode interference, strong compatibility, penetration of various non-metallic containers...
The sensor comes with 2 DIP switches, the right DIP switch controls the output voltage (high level) of the signal terminal (green line); when the DIP switch is dialed up, the high level is 5V; when the DIP switch is facing When dialing down, the high...
Monitors Water Level：Input Level Sensor Submersible Level Transmitter, high precision diffusion of silicon, more accurate monitoring of water level
4-20mA Signal Output：Submersible water level sensor 4-20ma ip68 stainless steel Liquid Level Transmitter, all digital conditioning circuit, 4-20mA signal output is more stable
IP68 Waterproof Probe: Liquid level sensor, IP68 multilayer waterproof protection, can be immersed in water for extended periods; housing made of 304 stainless steel, 316L diaphragm. Safer to use
Multi Point Control Capability: The Liquid Level Sensor Switch can do multi point control, to ensure that the liquid level is accurately monitored and fixed. It offers a and robust method of controlling the level of the liquid, making it ideal for a wide...
High Accuracy and Reliability: The Water Level Switch is engineered with high accuracy and reliability, thereby ensuring easy installation and efficient operation. The switch is made with stainless steel material, which ensures it is strong, and...
Wide Temperature Range: Designed to withstand high temperatures of up to 120℃, this Side Mounted Water Floating Sensor Switch is suitable for use in high temperature environments such as industrial facilities, solar energy systems, and bathroom...
Easy to Operate and Install: The Solid Stainless Steel Sensor Switch is easy to operate and install, making it ideal for DIY enthusiasts, technicians, or anyone who wants to achieve liquid level control in a hassle- manner. It has a male thread size of...
Wide Application: This switch normally closed open is suitable for liquids of different densities, pressures and temperatures. Ideal for water dispensers, water heaters, solar energy, air conditioners, humidifiers.
The non-contact liquid level sensor adopts advanced signal processing technology and high-speed signal processing chips, breaking through the influence of container wall thickness and achieving true non-contact detection.
The non-contact liquid level sensor has strong compatibility and can penetrate various non-metallic containers, such as plastic, glass, ceramic, etc., with a sensing thickness of up to 20MM.
Suitable for liquid-level detection of various curved, curved, and cylindrical containers.
The liquid level sensor (probe) is installed above and below the outer wall of the measured container (high and low levels of the liquid level), non-metallic containers do not need to be perforated and are easy to install.
The tested liquid is required to conduct electricity, and the contact surface is non-metallic, which can be widely used.
Smart Water Level Monitoring: Monitor the water depth in tanks, pools, ponds, and more with this compact and precise depth sensor. Ideal for rainwater tanks, aquariums, and reservoirs, even in hard-to-reach locations.
Ultra Long-Range Wireless: Enjoy unmatched reliability with LoRa-powered communication—up to 1/4 mile open-air range—ideal for basements, outdoor tanks, remote barns, or detached garages.
Real-Time Alerts & Historical Data: Get instant alerts via app, email, SMS, or push notification when water levels reach your defined thresholds. Access exportable water level history and trend charts directly from the app.
Custom Automation & Integration: Integrate with other YoLink devices to automate water control or trigger alarms. For example, activate a siren if water drops below or rises above set limits.
Configurable Depth & Liquid Density: Supports a maximum water depth of 5 meters (16 feet) and allows customization of total tank depth and liquid density to improve measurement accuracy.
Low Maintenance & Long Battery Life: Powered by a replaceable ER34615 lithium battery with up to 10 years of service life. Receive low-battery alerts to stay ahead of replacements.
Hub Required: Requires a YoLink Hub (sold separately) with an internet connection for full functionality, including remote monitoring, notifications, and automation.
Monitors Water Level：Input Level Sensor Submersible Level Transmitter, high precision diffusion of silicon, more accurate monitoring of water level
4-20mA Signal Output：Submersible water level sensor 4-20ma ip68 stainless steel Liquid Level Transmitter, all digital conditioning circuit, 4-20mA signal output is more stable
IP68 Waterproof Probe: Liquid level sensor, IP68 multilayer waterproof protection, can be immersed in water for extended periods; housing made of 304 stainless steel, 316L diaphragm. Safer to use
This is a non-contact water / liquid level sensor. It utilizes advanced signal processing technology by using a powerful chip (XKC-Y25-T12V) with high-speed operation capacity to achieve non-contact liquid level detection.
No contact with liquid makes the module suitable for hazardous applications such as detecting toxic substances, strong acid, strong alkali, and all kinds of liquid in an airtight container under high pressure.
There are no special requirements for the liquid or container and this liquid sensor is easy to use and easy to install.
The liquid level sensor is equipped with an interface adapter that makes it compatible with DFRobot "Gravity" interface. Four levels of sensitivity can be configured by pressing the SET button.
【Stable Design】: High quality solid structure, Anti-bending, high accuracy, high stability, anti-blocking hole design, easy to clean.
【Premium Quality】: This liquid level sensor adopts of anti-corrosion material, excellent anti-corrosion performance and durable.Anti blocking design, easy to clean.
【healthy to Use】: The shell is made of 304 stainless steel and durable, and with waterproof cable, healthy to use.The liquid level sensor is suitable for detecting 0-5m range water level.
【Excellent Performance】: With reverse polarity and current limit protection, laser proof temperature compensation,programmable adjustment.
【Fitment】:0-5M Measure Range+6M Cable, DC 10-30V Power Supply, 4-20mA transmission output, can be used with digital display, PLC, inverter, recorder and other instruments.
★This is a Mini stainless steel float switch,contains no mercury.
★This float switch is a device used to sense the level of liquid within a tank,the switch may activate a pump,an indicator,an alarm,or other device.
★This Mini float switch is a simple structure,easy installation liquid level controller.It does not have a complex circuit,will not be disturbed,as long as the material selection,liquid,pressure or temperature can be used in any environment.
★Light weight and simple working principle,high reliability.
★The versatility of this vertically monted sensor means that it can be installed either at the top or base of your tank,depending on whether you wish to detect the water`s rise or fall.
Last update on 2026-07-18 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Liquid Level Sensors
Sensor Type
Liquid level sensors come in various types, each suited for different applications and liquid properties. Common types include float switches, capacitive sensors, ultrasonic sensors, and optical sensors. Float switches are simple and cost-effective for basic on/off detection. Capacitive sensors are versatile and can detect levels through container walls for non-metallic tanks. Ultrasonic sensors offer non-contact measurement but can be affected by foam or vapor. Optical sensors provide precise detection and are often used in clean liquids.
Material Compatibility and Durability
The sensor's material must be compatible with the liquid it will be monitoring to prevent corrosion or contamination. Stainless steel, PVC, and various plastics are common materials. Consider the operating environment as well; if the sensor will be exposed to harsh chemicals, extreme temperatures, or high pressure, opt for a model with robust construction and appropriate certifications. Durability ensures the sensor's longevity and consistent performance over time.
Accuracy and Application Requirements
Determine the level of accuracy needed for your specific application. Some tasks require simple high/low detection, while others demand precise continuous monitoring. Consider the viscosity, conductivity, and presence of solids in the liquid, as these factors can influence sensor performance. Ensure the sensor's output signal (e.g., analog, digital) is compatible with your existing control system or monitoring equipment.
Frequently Asked Questions
What is the difference between a float switch and a capacitive sensor?
A float switch uses a buoyant element that rises and falls with the liquid level, triggering a switch at specific points. A capacitive sensor measures changes in capacitance, which vary with the liquid level around its probe or within the tank.
Can I use a liquid level sensor for corrosive liquids?
Yes, but you must select a sensor made from materials resistant to the specific corrosive liquid. Stainless steel (like 316L) or specialized plastics are often suitable for aggressive chemicals.
How do I choose the right sensor for a boiling or steaming liquid?
For liquids with significant vapor or steam, non-contact sensors like ultrasonic or radar level transmitters are often preferred. These are less affected by vapor condensation compared to submerged probes.
What maintenance is typically required for liquid level sensors?
Maintenance needs vary by sensor type and application. Some sensors may require periodic cleaning to prevent buildup or fouling. Others, especially those in harsh environments, might need occasional calibration checks to ensure continued accuracy.
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