Ultrasonic Sensor For Water Level Module HT-U066

The HT-U066 Ultrasonic Water Level Sensor is a professional-grade ultrasonic distance and level measurement module designed for high-accuracy, non-contact monitoring of liquids and surfaces in tanks, reservoirs, and industrial vessels. The sensor uses time-of-flight (TOF) ultrasonic technology, where the module emits a high-frequency sound pulse at 66±2 kHz, the pulse travels through air, reflects off the target surface, and returns to the sensor. By precisely measuring the round-trip time, the sensor calculates the distance to the target with an impressive accuracy of ±2 cm. The focused 60° beam angle ensures the measurement is concentrated on the area directly below the sensor, minimizing reflections from tank walls and other obstacles. The sensor has an effective detection range of 30 cm to 150 cm, with a blind zone of 0–30 cm in which measurements are not possible (a normal limitation of ultrasonic sensors). The HT-U066 outputs raw TOF data in microseconds (µs) via a UART serial interface at 3.3V logic level, 19200 baud rate (8N1), making it directly compatible with Arduino, ESP32, STM32, Raspberry Pi, and other microcontrollers. It operates from a wide 8V to 16V DC input range (with 12V DC as the standard) and consumes only 20 mA, making it suitable for battery-powered and solar-powered installations. The sensor is built for durability and longevity in real-world environments: the photosensitive resin shell is filled with silicone electronic potting gel that protects the internal electronics from moisture, vibration, and chemical exposure, while the aluminum transducer provides excellent acoustic performance and long-term reliability. With an IP54 protection rating, the sensor is well-protected against dust ingress and water splashes, suitable for outdoor and semi-protected indoor environments.

DataSheet

Specifications

General

• Model Number: HT-U066
• Sensor Type: Ultrasonic Distance / Level Sensor
• Detection Range: 30 cm – 150 cm
• Blind Zone: 0 – 30 cm (no measurement possible)
• Test Object Reference: φ75 PVC pipe at 0° angle, 1.2 m distance
• Operating Frequency: 66 ± 2 kHz
• Beam Angle: 60° ± 10° (single angle)
• Power-On Delay: ≤ 0.5 seconds
• Accuracy: ±2 cm
• Output Form: TOF (Time-of-Flight in microseconds)

Electrical Parameters

• Operating Voltage: 12V DC (range: 8 – 16V DC)
• Working Current: ≤ 20 mA
• Communication Interface: UART (3.3V logic level)
• Baud Rate: 19200 bps
• Serial Format: 8 data bits, no parity, 1 stop bit (8N1)

Environmental & Mechanical

• Operating Temperature: -20°C to +50°C
• Storage Temperature: -20°C to +50°C
• IP Protection Level: IP54 (protected against dust and water splashes)
• Shell Material: Photosensitive resin
• Potting Material: Silicone electronic potting gel
• Transducer Material: Aluminum
• Mounting Type: Top-mount (above target surface)

Applications

• Used in residential and commercial water tanks for level monitoring.
• Essential for agricultural irrigation reservoirs and water control.
• Employed in aquaculture and fish farming for water management.
• Used in rainwater harvesting systems to track storage capacity.
• Applied in industrial chemical tanks for non-contact level sensing.
• Common in flood and overflow detection systems for buildings.
• Used in wastewater treatment plants for sludge and water levels.
• Found in basement water alarm systems for early flood warning.
• Employed in automatic pump control to prevent overflow or dry-run.
• Used in fuel and oil tank monitoring for vehicles and machinery.
• Applied in liquid food processing for level control in vats and tanks.
• Common in smart home IoT systems for water management.
• Used in automatic livestock watering systems on farms.
• Found in swimming pool water level monitoring and auto-fill systems.
• Employed in building HVAC cooling towers for water level control.
• Used in firefighting water reservoirs for capacity tracking.
• Applied in dairy farms for milk and water tank monitoring.
• Common in automotive AdBlue and DEF tank monitoring.
• Used in water meter and flow monitoring stations.
• Found in dam and canal water level monitoring stations.
• Employed in DIY Arduino, ESP32, and Raspberry Pi projects for level alerts.
• Used in research and laboratory liquid handling systems.
• Applied in medical waste collection systems.
• Common in submersible pump control units.
• Used in flood early warning systems in vulnerable areas.