Allengra

Allengra is a developer of precision ultrasonic flow measurement solutions for UAV (unmanned aerial vehicle) applications. The company’s compact and highly innovative flow meters support drone manufacturers, operators and system integrators with high-accuracy measuring of fuel, coolant, hydrogen, agricultural liquids, and more.

PUM Fuel Flow Meter

High-accuracy fuel consumption monitoring for UAVs

Allengra’s PUM Fuel Flow Meter is designed for internal combustion engine-driven UAVs, heavy-duty drones, and other fuel-powered unmanned platforms. Leveraging Allengra’s experience in high-performance racing applications, it delivers reliable measurement capabilities and provides accurate real-time insights into fuel usage throughout the mission.

The flow meter supports detailed fuel usage analysis, allowing operators to better understand how much fuel has been consumed and how much remains onboard. By combining consumption data with known fuel capacity, users can determine key milestones such as when half of the available fuel has been used, helping to establish safe return-to-base points and improve operational planning.

• 72 x 32.4 x 56 mm, 240g
• Flow Range: 0.3 – 480 l/h
• Accuracy: ± 0.5% of measured value

More info: Advanced Ultrasonic Fuel Flow Meter for UAVs

Micro Flow Meter

Compact & lightweight flow meter for SWaP-constrained UAVs

The Micro Flow Meter provides fuel and liquid consumption monitoring capabilities in a compact, lightweight package that is highly suited for UAV applications where size, weight and cost are key considerations. Weighing approximately 50 grams, the sensor offers a significantly lower-SWaP alternative to larger fuel flow measurement solutions, and is ideal for developers prioritizing this over achieving maximum measurement precision.

The robust and cost-effective solution features an integrated temperature sensor, and offers a range of interface options including pulse, 0 – 5V, Modbus, I²C/CAN, and UART. It is available in U- or Z-shaped configurations.

• 73 x 41 x 43.7 / 62.2 mm, 50g
• Flow Range: 1 – 300 (OD6 connector) or 1 – 600 (OD8 connector) l/h
• Accuracy: ± 2% of measured value

More info: Compact & High-accuracy Flow Meter

Coolant Flow Meters

Coolant flow measurement for large & heavy-duty UAVs

Allengra’s range of coolant flow meters is ideal for larger UAV platforms powered by internal combustion engines, providing operators and developers with valuable insight into cooling system performance and supporting effective thermal management.

Available in plastic, brass and stainless steel versions and in a range of sizes, the sensor range provides a wide variety of options to suit specific platform requirements. The plastic variants offer the lightest and most cost-effective solution, making them highly suited for UAV applications where SWaP-C budget is an important consideration.

• Plastic & Brass Sizes: DN15-DN50
• Stainless Steel Sizes: DN15-DN20
• Measurement Range: 9 to 60,000 L/h
• Accuracy: ± 2% of measured value

More info: Coolant Flow Measurements for Heavy-duty UAVs

Hydrogen Flow Meter

Flow measurement for hydrogen fuel cell-powered drone platforms

Allengra also offers hydrogen flow meter technology that is ideal for supporting emerging UAV platforms that utilize fuel cell-based propulsion systems. By monitoring flow rates and usage during flight, the sensor enables precise system optimization, performance analysis and operational planning.

The sensor features robust stainless steel 316L construction as well as integrated temperature, pressure, and humidity sensors, and offers CANbus and Modbus interfaces.

• Volume Flow Range Options: 10 – 1000, 20 – 1700, or 40 – 3400 l/min
• Volume Flow Accuracy: ±3 % of measured value

More info: Ultrasonic Flow Sensor for Hydrogen Fuel Cell-powered Drones

Flow Measurement for Agricultural & Liquid Dosing Drone Applications

Allengra’s flow measurement technology is also ideal for UAV liquid dosing systems, including agricultural drones used for fertilizer and other spraying applications. By monitoring the quantity of liquid being delivered, the sensors can help operators track application rates and verify distribution volumes throughout the operation. The technology can also assist with balancing flow across multiple dispensers, making it highly suited to heavy-duty agricultural drone platforms that require accurate and consistent liquid application.

More info: Flow Measurement for Agriculture