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Generally, if water is getting out that means you've got a little room to go before it is too tight. I've found I need to go tighter than I feel comfortable with (or live with a little drip). As for the float, sounds like something is cross-threaded. A slight downward pressure while turning and keeping it centered may help correct it. |
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I thought I was making great progress today. Did a quick "dry fit" of the probes in the flow cell--screwed them in part way to make sure the threads got along. All seemed fine. So, I went ahead & calibrated the pH & ORP probes, rinsed them, wrapped them with a fair amount of teflon tape and installed them in the flow cell.
Leaks galore on the top of the flow cell :-( I uninstalled the probes, re-wrapped them with a fair amount of teflon tape again & no love.
I thought the leak(s) in part may have been from the flow switch. I removed it for boring & tapping the probe holes. Installed it with fresh tape on the bench as I did with the input, output, & drain valves. Nothing was "cranked down" and all seemed good. I had not noticed any leaks previously, but the probe holes were vacant. Certainly none of the valves were leaking.
Just to be sure, I removed the flow switch from the flow cell, re-wrapped it with tape, & went to re-install it. For the life of me, I cannot get the little bugger to remain vertical as I install it (hands only--no tools ever used except to loosen it when I removed it originally). Little bugger lists to the left & the flow cell "float" catches on the side. Threads on the flow cell seem fine (a bit hard to see them whilst doing pad ballet) & the threads on the switch also seem ok.
Is there some magic to reinstalling the switch? It was operating correctly when I was testing earlier this week without the probes installed, so I don't think it was cross-threaded.
It also looks like there may be some leakage under the teflon tape on one/both of the probes. I'm being very cautious tightening them, as I don't want to crack the cell, assuming I haven't already damaged it.
So, I'm at a dead end inches from the finish line.
Any tips & wisdom from the flow cell gods are appreciated greatly!
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