The reference level for all measurements is the bottom of the tank. Level to be detected is marked as “C”, and “B” is the distance of the ultrasonic sensor 

Ultrasonic wireless water level gauge for rainwater tanks and cisterns Proteus EcoMeter S is an ultrasonic liquid level sensor, battery powered and equipped with a digital radio transmitter. This device has been developed especially for water tanks, rainwater and cisterns - but it can also be used for continuous measurement of the fuel tanks content (eg. diesel).

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Ultrasonic Level Sensors use a pulsing sound generator and receiver to read sound echoes between the sensor and liquid level to provide a continuous level 

Dyp-U02 Ultrasonic Fuel Level Sensor Non-Contact GPS Tracking Tank Level RS232 RS485 Uart Analog Output Fuel Level Sensor, Find Details and Price about Fuel Level Sensor Fuel Tank Level Sensor from Dyp-U02 Ultrasonic Fuel Level Sensor Non-Contact GPS Tracking Tank Level RS232 RS485 Uart Analog Output Fuel Level Sensor - Shenzhen Dianyingpu Technology Co., Ltd.

Non-Contact Ultrasonic Level Controller for Small Tank Applications. The LVCN414 Series is a non-contact, ultrasonic level controller and transmitter that delivers reliable performance for small-tank fluid handling control solutions. View Specs. See More Items from this Family (8)

Ultrasonic level measurement with Prosonic sensors provides continuous, non-contact and With the known tank geometry the level can be calculated.

Measurement clear to the bottom of the tank can be realized. elobau 's ultrasonic tank level sensors feature an extremely broad operating temperature range.

Senix non-contact ToughSonic® ultrasonic sensors offer cost-effective, continuous tank level monitoring and measurements for small and large tanks. They install at the top of the tank, are not immersed in the liquid, and can measure both benign and chemical liquids.

Ultrasonic Level & Distance Sensors. Senix ultrasonic level and distance sensors measure through the air using ultrasonic sound waves. They provide fast, reliable non-contact measurements at distances up to 50 feet (15.2 meters). Over 100,000 Senix sensors are in use worldwide in some of the most demanding distance measurement environments.

Ultrasonic Water Level Sensor refers to the ultrasonic level sensor used to measure the water level. Used for industrial liquid tanks, or river water level non-contact monitoring and control.