Chagrin:
This has a range of 0 to 1.45 PSI or 0 to 1019mm of water. Connect a tube to the port and anchor it to the bottom of the tank and it will have a 0 to 5V output based on the water level.
I wanted to follow up on this, because it is something I evaluated fairly carefully. The problems are:
If you position the sensor at the bottom and have it reading the pressure of the water, it works great, but the sensor must be one that is able to work with a water medium, day after day, month after month, in continuous service. The cheapie sensors are not suitable for this service. I have an application where I do need to do this, and what I have in mind is to have the sensor read the pressure in a small balloon of dry air that is, in turn, submerged in the medium.
If you have the sensor at the top and have it read the pressure in a dip tube stuffed down into the water, you will have two problems: the air in the tube is not dry, and so it potentially runs up against the capabilities of the sensor, and worse, the air in the dip tube gradually dissolves in the water and effectively escapes over time. So a few weeks down the road the water level appears to have dropped by 100mm. There are workarounds, of course. Like pumping air into the dip tube periodically to make up for lost air and stuff, but the complexity of the solution is greater.