Calibrating vans capacitive senders and Dyn. Cvtrs

[Brantel]

Dynon,

D120 question....

What sort of step change should we see
when using your converters with a standard rv7 tank with
properly installed capacitive senders by Van's?

What is the resolution of the converters?

When calibrating mine I get several steps that read the same...With the warning that it did not change.  This is in the middle of the tank not at the top or bottom like you might expect.

Seems capacitance change is less than the resolution of the converters but surely you guys designed them
for the typical Vans units?

What is the system doing when
it says "Please wait"?

 

[Brantel]

Re: Calibrating vans capacitive senders and Dyn. C

One more question.

How does the system use the calibration table?

Does it read linear point to point or does it create some curve
with smoothing between min and max using the intermediate points as a guide for the curve?

 

[Brantel]

Re: Calibrating vans capacitive senders and Dyn. C

Here are my results after calibrating a second time.

The left looks OK but the right bothers me.  How can two tanks built exactly the same way be this different?  There is no reason I can think of why that right tank has several points the same right in the middle of its range????

 

[Brantel]

Re: Calibrating vans capacitive senders and Dyn. C

Hey Robert,

Thought you might want to see how I put that hat you sent me to good use!

 

[Brantel]

Re: Calibrating vans capacitive senders and Dyn. C

Anyone home that can answer the questions above?????

 

[dynonsupport]

Re: Calibrating vans capacitive senders and Dyn. C

During the "please wait" phase, the unit is taking data and doing fancy math (averaging and such) to come up with a stable number. One thing you might try doing is waiting a bit longer after you add before you tell it that you've done so. That will let the cap-volt stabilize itself.

Keep in mind that at the middle of the tank, you have a lot of surface area so volume changes are smaller in terms of height in the tank.

I suspect you'll be OK, even with those flatter spots in the data. If you have the ability to slowly drain/fill the tank, you might do so to confirm that it works out.