Fuel flow sensor
The TFTHP flowmeter is developed to measure low range
(3.6~120 l/hour)
of fuel flow with high resolution output. It has high
chemical resistance and it is suitable for aggressive liquids. The case can be opened for periodic monitoring and eventual
replacement of the tube.
Recommendation of installation and use:
- Check flow direction (arrow on sensor).
- Never clean the sensor with compressed air.
- Install a filter in the fuel line before the sensor.
- Oil the fittings before mounting the tubes.
- The tubes before and after the sensor should be straight for at least 5 cm.
- Connection of fuel flow are suitable for 6 mm tubes.
- Use only spring band clamps of the type depicted here, with the appropriate diameter,
in order to avoid deformation of the plastic fittings.
- Protect the sensor from high temperature with a firesleeve material.
- Check for leakage after system start.
- Inspect the fuel sensor every year or every 100 hours of aircraft use for leakage and aging.
To inspect and clean the sensor, open it, remove the sensor tube from the fuel system and look inside the two
fittings to check for material integrity, aging and deformation. In case of any anomaly of the sensor tube, it must be
replaced. Verify that the sensor tube is clean and without any obstruction. If necessary clean with a flow of fuel in
the opposite direction.
- The fuel flow transducer must be installed before the carburetor and after the eventual return line (Vapor lock).
- Don't fix it mechanically to the airplane structure to avoid vibrations damage.
- Mount the transducer lower than the carburetor, or no more higher than 10 cm every 30.
•
Electrical connections:
RED WIRE: +12V (connect to pin 21 of CON2 connector)
BLACK WIRE: GND (connect to pin 3 of CON2 connector)
WHITE WIRE: signal (connect to pin 22 of CON2 connector)
IMPORTANT: After completing the installation verify that the engine is working properly at every RPM speed; verify
also that at full RPM the fuel pressure after the fuel flow transducer never drop below the minimum pressure
indicated in your engine's manual.
- Typical example installation of the fuel flow transducer -
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