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Is it a metal tank? Perhaps consider a contactless ultrasonic level sensor? Mine's a Vetus (the water tank sensor is from Gobius) but neither is really necessary for me, the tanks are plastic and I can see the level(s) from the outside...
The only snag is one or two flushes isnt a lot of use when you are a long way from a pump out station ie down South. You would think in the 21st century someone would come up with an answer. As said one minute you have plenty of room and the next its 'panic stations'.
Hylander wrote "You would think in the 21st century someone would come up with an answer. "
There are answers but not at a price your average boater would be prepared to pay. A time of flight ultrasonic level gauge, for example, would resolve to better than 1mm liquid height or a radar unit might even be better than that. However, a simple single transducer and display transmitter would more likely be in the £1000+ bracket and not tens or hundreds of £'s.
The problem is waste tanks are generally large surface area but shallow. Therefore, a tiny increment in liquid height is a significant volume of liquid and to measure small level changes requires decent technology which costs money. A diesel tank, conversely, is usually very deep in comparison to a small surface area and a simple float and potentiometer device can determine level changes of several cm with acceptable accuracy and also be produced economically.
This message was edited by L'sBelles on Sep-4-21 @ 11:03 PM
The sender on this unit has a "full" probe about 2 inch long so on most tanks this gives some lee way. On our tank this was probably 15 to20 % volume so unless it was after a particularly good night on the ale not a great panic to empty.