Capacitive Fuel Level Bulletproof 1000 hrs - Until Now

[bkervaski]

Yes, interestingly. Earth X Battery. Can't imagine how this would affect things though, as nominal bus voltages haven't changed.

This may be a good place to start ... my guess (without any research or knowledge of your setup) is that swapping battery types is throwing off your calibrations .. Lithium (especially LiFE) are different animals. They act like a traditional battery but are very different. LiFE (lithium iron phosphate) for example hold a constant voltage until it's fully discharged then drops off radically.

If you still have your old battery or a similar one, maybe hook it up and see what the readings show.

Hope you find the issue!

[larosta]

On the subject of the battery change. You may want to check the supply voltage to the signal conditioners. A few years ago we were certain that a instrumentation package was supplied by a regulated power conditioner until we had a component failure thatmdrooped the voltage to the unit. It was only then that we discovered that the instrumentation package (which was voltage sensitive) had been connected to a raw DC power buss and was calibrated with that voltage. Took a lot ‘o investigation and spla’nin to recertify the data we took in that condition.

-larosta

[david.perl]

ive noticed a simi.,ar issue with my sensors. No recent battery change and only 200 flying hours.

Tank sensors were always spot on, today read 120 ltrs remaining and yet aircraft took 60 ltrs so was overreading by 20ltrs.