Calibrating The Airspeed Sensor - GRAUPNER JetCat P60 Bedienungsanleitung

[Seite 41]

Calibrating the airspeed sensor

The characteristic curve of the differential pressure sensor can be calibrated to obtain maximum
measurement accuracy.
To calibrate the sensor you will need the following additional items:
•
50-60 cm length of silicone hose or similar (any internal diameter)
•
Water
•
Ruler or metre rule
This is the procedure:
1. Fill the silicone hose with water (at least 50 cm water column)
2. Connect the hose either directly to the centre inlet of the differential pressure sensor, or directly to the
front of the pitot tube.
3. Press and hold "RUN" on the GSU and switch on the electronics.
Hold the "RUN" button pressed in until you see the message:
Cal. AirSpeedSns
Set 40 cm water
4. Now set the end of the water column at the same height as the inlet of the differential pressure sensor (or
the pitot tube), and press the "INFO" button (= defines zero point).
5. The final step is to hold the end of the water column exactly 40 cm (linear measurement) higher than the
zero point defined under Step 4. When you have done this, press the "MIN/MAX" button. The screen
should now show h=40.0 at the top right of the screen. To test whether the calibration process was
successful, move the end of the water column down, and read off the height on the ruler. The GSU will
now display the calculated water column height (h=xx.x) at top right of the screen. The value you find on
the ruler should be the same as the value displayed on the screen. You can repeat steps 4/5 as often as
you like. The calibration value displayed at bottom right of the screen should vary between 6000 and
10,000 (default = 8560).
6. The final step is to press the "MANUAL" button on the GSU to store the calibration data determined by
this process. The Jet-tronic now stores the calibration data and reverts to normal operation.
on the GSU's screen.
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