Fuel Flow Sensor

The Fly Henry Fuel Flow Sensor is an inline turbine-based transducer designed to measure real-time fuel consumption for microlights and paramotors. When paired with the FLY Meter or PPG Meter, it allows the pilot to see instantaneous fuel flow, average consumption, and total fuel used.

1. Technical Specifications

Fly Henry offers two main variants depending on the flow requirements of your engine:

• Pulse Output: The sensor generates electrical pulses as the internal turbine spins. The instrument counts these pulses and uses the "Consumption Constant" (K-factor) to calculate the volume.
• Operating Voltage: Powered directly via the Fly Henry Measurement Module (typically 5V or 12V signal).

2. Installation Rules

To ensure accurate readings and prevent engine issues (like vapor lock or air intake), Fly Henry specifies several strict installation rules:

• Horizontal Mounting: The sensor should be mounted horizontally to ensure the turbine spins evenly and to prevent air bubbles from getting trapped in the housing.
• Filter First: A fuel filter must be installed before (upstream of) the sensor. Any small debris or grit in the fuel can jam the delicate turbine, leading to a zero-flow reading or a fuel blockage.

Placement in the Fuel Line:

1. With Electric Pump: Place the sensor between the pump and the carburettor (on the pressure side).
2. Gravity/Diaphragm Feed: Place it between the tank and the carburettor. Ensure all connections are airtight; even a tiny air leak in a vacuum-feed system will cause the fuel to "foam," leading to wildly inaccurate high readings.

3. FLY Meter Integration

When connected to the 2024/2025 FLY Meter, the fuel flow sensor unlocks advanced "Smart" features:

• Fuel Leak Alarm: The FLY Meter can detect if the fuel flow is unnaturally high compared to the RPM, triggering an alert for a potential fuel line leak.
• Time-to-Empty Calculation: By combining data from the Fuel Level Sensor (in the tank) and the Fuel Flow Sensor, the instrument calculates exactly how many minutes of flight time you have left at your current power setting.
• Calibration: If your fuel used reading is consistently off (e.g., the gauge says you used 10L but you only put 9L back in), you can adjust the "Consumption Constant" in the menu to fine-tune accuracy.

4. Maintenance

• Cleaning: The sensor cannot usually be opened. If it becomes clogged, it must be flushed backward with clean fuel or replaced.
• Vibration: It is recommended to "float" the sensor between two flexible fuel hoses rather than hard-mounting it to the engine frame, as extreme vibration can cause the turbine to skip or wear prematurely.