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Rain water Harvesting Tank Gauge Problems

Postby brucedurant » Fri Nov 05, 2010 8:18 pm

Our RWH system has a buried tank with a guaging system that is supposed to display the water level inside and when the tank gets too low should control topping up the tank from the mains to stop the pump running dry.

Problem is that recently the controller said the tank was nearly empty when it is clearly over half full. So we talked to the system suppliers and recalibrated the guage per the instalation manual. It then thought that the tank was only 70% full when it was overflowing after a downpour. Recalibrated the gauge it again and back to square one.

The controller is purportedly made by "VARỈ" in Hungary (thats a small circle over the I by the way) and their mark is on a couple of things if you look hard. In the house its a small box with a LED bargraph and in the tank there is a length of what looks like 300ohm flat VHF aerial wire with a weight at the bottom. The wire is split down the middle with a plastic spacer half way along to make it take up a diamond shape.

Has anybody else come across this problem with this sort of gauge. Calibrating it involves climbing into the top of the tank and lowering this diamond aeriial at a very slow rate of 1" per minute which is quite tedious when its over 5' long! Especialy and the spaceer won'y go through the hole in the diaphram in the tank without being juggled around.
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