<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">In a hurry I had thought this was a solid state sensor. I should probably say non-glass instead of solid state anyway. We were thinking to use many cheap non-glass senors and extensive calibration. I was sort of hoping to find an "Arduino ready" non-glass sensor like they use for plants:</div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default"><font face="arial, helvetica, sans-serif"><a href="http://www.amazon.com/BestDealUSA-Plant-Flowers-Tester-Moisture/dp/B006KY5OUG" target="_blank">http://www.amazon.com/BestDealUSA-Plant-Flowers-Tester-Moisture/dp/B006KY5OUG</a></font><br>
</div><div class="gmail_default"><a href="http://www.ebay.com/itm/LUSTER-LEAF-1845-RAPITEST-DIGITAL-Soil-Plant-Garden-PH-Sensor-Meter-Tester-Test-/111292956070" target="_blank">http://www.ebay.com/itm/LUSTER-LEAF-1845-RAPITEST-DIGITAL-Soil-Plant-Garden-PH-Sensor-Meter-Tester-Test-/111292956070</a><br>
</div><div class="gmail_default"><a href="http://www.farmtek.com/farm/supplies/prod1;ft_ag_growing_supplies-ft_lawn_garden-ft_soil_testers_probes;pg103398.html" target="_blank">http://www.farmtek.com/farm/supplies/prod1;ft_ag_growing_supplies-ft_lawn_garden-ft_soil_testers_probes;pg103398.html</a><br>
</div><div class="gmail_default"><a href="http://www.amazon.com/Etekcity%C2%AE-Temperature-Compensation-Measurement-Resolution/dp/B00FJFEB2O/ref=pd_cp_hi_1" target="_blank">http://www.amazon.com/Etekcity%C2%AE-Temperature-Compensation-Measurement-Resolution/dp/B00FJFEB2O/ref=pd_cp_hi_1</a><br>
</div><div class="gmail_default"><br></div><div class="gmail_default">Not sure how these work maybe some sort of electrochemistry. Maybe one electrode is antimony or iridium. The oxides of these seem to have potential sensitive to pH. Maybe it is something much simpler, like conductivity. I do not know yest if this type of sensor will work in sea water. I will ask someone who knows electrochemistry. </div>
<div class="gmail_default"><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Mar 29, 2014 at 1:29 PM, Glen Smith <span dir="ltr"><<a href="mailto:mrglenasmith@gmail.com" target="_blank">mrglenasmith@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The spark fun site has plenty of reviews that indicate that it is flakey to use and may give a fixed 7.00 reading after soldering it up. I think the test tube looking thing that you are seeing is for storing the sensor, according to the documentation, once calibrated, the sensor should not be allowed to dry out. "<span style="font-weight:bold;text-align:justify;background-color:rgba(255,255,255,0)"><font>When it’s not in use keep it in the supplied soaker bottle. Periodically change out the storage solution in the soaker bottle with new storage solution."</font></span><div>
<br></div><div>Reading up on the OceanX prize it looks like they are looking for new sensors, are you just using this as a starting point? Or are there different categories?</div><div><br></div><div>Glen<br><span style="font-weight:bold;text-align:justify;background-color:rgba(255,255,255,0)"><font></font></span>
<p dir="ltr">- Thumbed one letter at a time on a 2.25 x 1.25 inch Galaxy smartphone keyboard, please forgive any errors.</p>
<div class="gmail_quote"><div>On Mar 29, 2014 10:34 AM, "Jeffrey Crews" <<a>cruzetti@gmail.com</a>> wrote:<br type="attribution">
</div><div><div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Martin et al:<div><br></div><div>I thought you were talking about solid-state pH sensors, like ISFET sensors? That one from Sparkfun looks like a standard glass pH probe, which are a huge pain, esp in field use.</div>
<div><br></div><div>jsc</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Mar 29, 2014 at 10:01 AM, Martin Brooke <span dir="ltr"><<a>martin.brooke@duke.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Probably <div class="gmail_default" style="display:inline">
</div><span style="font-family:arial"><a href="https://www.sparkfun.com/products/10972" target="_blank">https://www.sparkfun.com/products/10972</a></span></div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><span style="font-family:arial"><br></span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">
<br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div></div><div class="gmail_extra">
<div><div>
<br><br><div class="gmail_quote">On Fri, Mar 28, 2014 at 2:58 PM, Pete Soper <span dir="ltr"><<a>pete@soper.us</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Which low cost sensor are you leaning toward?<br>
-Pete<div><br>
<div>On 03/28/2014 02:02 PM, Martin Brooke
wrote:<br>
</div>
</div><blockquote type="cite"><div>
<div dir="ltr">
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">I
am going to have a go at the Ocean X prize and was thinking of
using a low cost solid state pH sensor.</div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">
I wondered if there were any tips or advice.</div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
</div>
</div>
<br>
<fieldset></fieldset>
<br>
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