Re: [Amel Yacht Owners] watermaker,TDS meter
Ian Shepherd <ocean53@...>
Hi Gary & John.
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I have now found out why my inline TDS meter continuously gives an 'Error' reading. It is not to do with the orientation of the probe at all. The problem is that the water maker output is so polluted that meter is out of range. It was a guest on board today that refused a glass of water that aroused my suspicions. I guess I had got used to the taste, but she convinced me that something was wrong. I thought it may have been a dirty 50 micron filter, but changing it did nothing to the taste. Another test with a Hanna confirmed a seriously polluted output (860 with an 'E' in the top right hand corner. So yet another case of being fooled by the green light, which as we now know means nothing. I have disassembled the 160 l/h membranes which have 185 hours use. (For Eric- if you have not yet removed your membranes, I can confirm that it is best to remove the whole cradle first, then unscrew the rods. The only nasty part of the job is reaching the self tapping screws that hold the blower ducting together. You may need to do this to get to the two outboard roof bolts, depending on your installation. My 110/220V transformer gets in the way of the side screw). Gary, I am concerned that the sea water side of the membranes is only isolated from the centre output tube by a single 0-ring on the membrane nipple. Do you really think this seal is sufficient to reliably withstand a 60 Bar or 870 PSI sideways pressure? ( have the nylon end caps). The caps don't seem to be a very tight fit on the nipple seal, so this may be the root of my problem rather than the membranes themselves. I will get some new seals and jury rig the assembly for a trial. I use silicon grease on seals. Do you think that the seal may do a better job with sealant perhaps, at the expense of more difficulty in getting it apart again? If so, can you recommend any particular type or brand of sealant for this application? I was interested to read about your flying exploits. Not so long ago Steve Jones who was a UK aerobatic champ took me up in his Sukoi. After 19,500 hours of commercial flying, it was the most hair raising experience of my life! I take my hat off to you for being able to stay ahead of the aircraft whilst the world is a 270 degree per second roll rate blur and the G-meter is swinging from +7 to -5! Currently I fly hang gliders, paragliders and sailplanes. Cheers Ian Shepherd SM414 'Crusader'
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From: amelliahona Date: 6/14/2006 2:38:47 AM To: amelyachtowners@yahoogroups.com Subject: Re: [Amel Yacht Owners] watermaker,TDS meter Ian: Have you tried orienting the sensor horizontally or inverted? I found that my sensor didn't give consistent readings when I had it mounted vertically. I think that perhaps the probes weren't long enough and there was an air bubble trapped when it was upright. See the photo of my installation in the photo section and you will see that my sensor is now mounted horizontally and in that orientation any air in the system is washed past the probes yet the sensor probes remain imersed in product water. Just a thought. Regards, Gary --- In amelyachtowners@yahoogroups.com, "Ian Shepherd" <ocean53@...> wrote: it in the blue output line, all I get is an 'Err' message when the watermaker is producing water. It does give a reading when the flow is stopped, i.e.able to cope with a decent flow rate. I have tried just after the membraneoutput and just after the control panel with the same result. I have waited 5-10
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