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Rika Sensor is a weather sensor manufacturer and environmental monitoring solution provider with 10+ years of industry experience.

Level Sensing Technologies for Underground Water Storage Tanks

by:Rika Sensors     2023-08-04


Underground water storage tanks are an essential component of many residential, commercial, and agricultural setups. They provide a means to store water efficiently and help in preventing water scarcity during dry spells or emergencies. However, monitoring the water level in these tanks presents a significant challenge. That's where level sensing technologies come to the rescue. In this article, we will explore various level sensing technologies used for underground water storage tanks and their benefits.

1. Float Switches: Reliable and Cost-Effective Solution

Float switches are one of the most commonly used level sensing technologies for underground water storage tanks. These switches consist of a float attached to an arm and a microswitch. The float rises and falls with the water level, activating the microswitch when the desired level is reached. This simple yet effective technology is easy to install and provides accurate measurements.

Float switches come in different materials such as stainless steel, plastic, and brass, allowing users to choose the appropriate switch based on their specific requirements. Additionally, they are cost-effective and have a long lifespan, making them a popular choice for many tank owners.

2. Ultrasonic Level Sensors: Accurate and Non-Contact Measurements

Ultrasonic level sensors offer a non-contact solution for monitoring water levels in underground storage tanks. These sensors use high-frequency sound waves to measure the distance between the sensor and the water surface. The time taken for the sound waves to bounce back determines the water level.

This technology provides highly accurate measurements, even in harsh environments. Furthermore, ultrasonic level sensors are not affected by factors like temperature, pressure, or the composition of the liquid being measured. These sensors are also easy to install and require minimal maintenance, making them an efficient choice for underground water storage tanks.

3. Capacitance Level Transmitters: Reliable Monitoring in Challenging Conditions

Capacitance level transmitters utilize the principle of capacitance to measure the water level inside underground storage tanks. These transmitters consist of a probe inserted into the tank, which generates an electric field around it. As the water level changes, the capacitance between the probe and the tank's wall alters, providing accurate level readings.

One significant advantage of capacitance level transmitters is their ability to endure challenging conditions such as the presence of debris, turbulence, and corrosive liquids. These transmitters are highly reliable and offer continuous, real-time monitoring of water levels, making them ideal for underground storage tank applications.

4. Pressure Transducers: Monitoring Water Levels with Precision

Pressure transducers are another reliable option for monitoring water levels in underground storage tanks. These transducers measure the pressure exerted by the water column above them, and by converting it into an electrical signal, they determine the water level.

Pressure transducers are suitable for tanks with varying water densities, as they compensate for changes in liquid properties. They provide accurate measurements and are unaffected by external factors such as temperature or humidity. Additionally, pressure transducers are durable and require minimal maintenance, making them a reliable choice for long-term level monitoring.

5. Conductive Probes: Detecting Liquid Level with Electrical Conductivity

Conductive probes offer a straight-forward solution for level sensing in underground water storage tanks. These probes are made from conductive materials and are installed at different levels inside the tank. When the water touches a specific probe, it completes an electrical circuit, indicating the water level.

With no moving parts, conductive probes are reliable and require minimal maintenance. They are also suitable for tanks with aggressive or corrosive liquids. However, it's important to ensure that the probes are properly insulated and protected against damage.


Level sensing technologies play a crucial role in ensuring the efficient operation of underground water storage tanks. By accurately monitoring water levels, these technologies help prevent overflows, ensure sufficient supply, and enable timely maintenance. Whether you opt for float switches, ultrasonic level sensors, capacitance level transmitters, pressure transducers, or conductive probes, it's essential to choose the appropriate technology based on your specific requirements. With these advancements in level sensing technologies, managing water resources effectively becomes easier and more reliable for various applications.

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