Originally Posted by Stranded Mariner
I read something about that before (Maybe even on this forum). Isn't the principle that the system measures the back pressure on a sounding pipe, which changes with hight of the medium in the tank?
We used to sell industrial systems like that, and they are very reliable.
Yes they are still occasionally used in certain applications especially where it is a pneumatic only measuring and control system. Where electrical equipment
is not available or desirable. More high tech measuring equipment
has replaced these in most instances but the cost of that equipment and the complexity has kept guys like me employed for a long time. Ultra sonic equipment, Capacitance probes, radar
transmitters, inductive probes and load cells have all been used to measure level. Having installed and repaired all these systems is the reason I don't want them on my boat. Simple is good.