Brief Description: Calibrating Princeton Capacitive Probes - Part 3
So then I went through the calibration procedure again on the left side, this time with the 12v supply voltage and found that the probe voltage output at FULL was now 5v exactly as it should be and the reading on the EIS-4000 was 21 as it should be. I took the 4 containers BACK over to the fuel island and put ANOTHER 21 gallons of fuel in them and left ANOTHER $94 dollars for Chevron and headed back to the hanger to calibrate the Right fuel tank. This procedure whet exactly as the Left side had and the EIS-4000 reading was also consistent with the 21 gallons at full.
So all of that was good. But, now, however, I'm not so sure the calibration is accurate. The tanks are reading that about 5 gallons of fuel have been used per side (10 total). I've been running the engine some, maybe 45 minutes total at this point which might translate to 5 gallons or so. Also, given the dihedral in the wings, they should basically still be reading full with a drain of 2.5 gallons per side. Now I'm not really sure what to think. I will have to keep a very close eye on the levels in the tank manually for a while until I can get a better feeling for how the probes are reading.
