Tank Depth

I believe that a short time ago there was a discussion about this. but
depending on the head of the tank one could use an MPX5000 series pressure
sensor with a dip tube or am I too late?

I have a number of 55 gal drums of water that I would like to know the
depth of in my rain water gathering system so that I don't pump it dry and
ruin a sprinkler pump. I am going to use one of them per drum to monitor
the levels. I believe that the pressure of one foot of head is .43 PSI and
that a drum is about 3 feet deep, giving a pressure of 1.29 PSI. Does this
sound correct?



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