<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><DIV><DIV>On Jun 7, 2006, at 12:39 PM, Stan Kroeker wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">Fred, Mark,</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px"><BR></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">Employing the 'aural' method of water depth sensing, will the end of trickling sound always result in a precise depth in the reservoir?<SPAN class="Apple-converted-space"> </SPAN>Of course, this depends on the length of tubing in the reservoir but can you simply add a measured amount of water after the sound stops?<SPAN class="Apple-converted-space"> </SPAN>ie: <SPAN class="Apple-converted-space"> </SPAN>trickling sound stops: <SPAN class="Apple-converted-space"> </SPAN>add exactly one-half litre more to bring level within 1 cm of top? <SPAN class="Apple-converted-space"> </SPAN>Or ... perhaps this measured amount could correlate to the moment the light stops blinking?</FONT></P></BLOCKQUOTE>I just guesstimate an amount after the noise stops: x time pouring, and visual of how much is being added, looking at the can before and after. Based on experience. And check my experience with a finger in the tank, where there isn't an undercover.<BR><BLOCKQUOTE type="cite"> <P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px"><BR></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">If this works (the reservoir would have to be perfectly level, of course), you could simply mark a line on the watering can to indicate the 'top-up' amount.<SPAN class="Apple-converted-space"> </SPAN>How close to the top of the tank do you dare to fill, Fred?</FONT></P></BLOCKQUOTE>About 2 cm, enough to get below the slot for the tube/probe assembly, plus a bit so it doesn't wick up through that hole. Dare? Heck, I once ran it clear to the top, not thinking about that little slot. And found that the water dripped out, so I wasn't ahead any <G>. What's a wee bit of water on the carpet in a faculty office? Nobody will ever notice.<BR><BLOCKQUOTE type="cite"> <P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px"><BR></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">Regards,</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px"><BR></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">Stan Kroeker</FONT></P> </BLOCKQUOTE><BR><DIV><DIV>Regards,</DIV><DIV>Fred Sturm</DIV><DIV>University of New Mexico</DIV><DIV><A href="mailto:fssturm@unm.edu">fssturm@unm.edu</A></DIV><DIV><BR class="khtml-block-placeholder"></DIV></DIV><BR></DIV><BR></BODY></HTML>