The Fly Henry Fuel Level Sensor is a specialized, solid-state probe designed for paramotors and microlights. Unlike traditional automotive float-arm sensors, it uses a capacitive "tube-in-tube" design (concentric tubes), which provides highly accurate and stable readings even in small, irregularly shaped fuel tanks.
Core Functionality
The sensor measures the "dielectric constant" between the two tubes. As the fuel level rises and fills the space between the tubes, the capacitance changes. The Fly Meter or PPG Meter then converts this signal into a percentage or litre reading.
No Moving Parts: Because there is no float or mechanical arm, it is extremely reliable and immune to the vibrations common in small aircraft engines.
Anti-Slosh: The tube design naturally dampens the movement of fuel, preventing the "jumping" needle effect often seen with mechanical gauges during turbulence.
Customizable Length: One of the most unique features is that the pilot can shorten the rod (the tube) to fit the exact depth of their tank. This is done by carefully sawing the outer and inner tubes to the required length (as detailed in Fly Henry's installation videos).
Installation & Setup
Mounting: The sensor requires a 12 mm hole drilled at the deepest vertical point of the fuel tank.
Sealing: It uses a specialized rubber ring and nut system to create a fuel-tight seal without needing messy sealants.
Calibration: Once installed, you must calibrate the sensor via the Fly Meter menu. This usually involves:
Level 0%: Calibrating when the tank is empty.
Level 100%: Calibrating when the tank is full.
Alarms: The FLY Meter allows you to set a low-fuel alarm (typically defaulted to 15% or 2 litres), which will trigger a visual warning on the display.
