AVR-Chat

Sorry, my earlier response was incomplete, just the germ of an idea.

Since the inverted standpipe is initially filled with air, when the liquid
level rises, the gas will be compressed allowing liquid to enter the tube
which will reduce the pressure head. The actual pressure measured will depend
on the total volume of the tube and the amount displace by liquid but will
always be less than the pressure at the bottom of the tube.

-- The gas compression correction is left as an exercise for the student. --

Bruce


David VanHorn wrote:
>> At the very least study the maximum pressure the sensor can be exposed
>> in addition to its full scale range.
> 
> A very good idea.. Water does not compress, but your sensor does.
> "what was that crunching sound?"
>