[TriEmbed] Anybody have any experience with electronic pH sensors

Sat Mar 29 15:17:51 CDT 2014

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:

http://www.amazon.com/BestDealUSA-Plant-Flowers-Tester-Moisture/dp/B006KY5OUG
http://www.ebay.com/itm/LUSTER-LEAF-1845-RAPITEST-DIGITAL-Soil-Plant-Garden-PH-Sensor-Meter-Tester-Test-/111292956070
http://www.farmtek.com/farm/supplies/prod1;ft_ag_growing_supplies-ft_lawn_garden-ft_soil_testers_probes;pg103398.html
http://www.amazon.com/Etekcity%C2%AE-Temperature-Compensation-Measurement-Resolution/dp/B00FJFEB2O/ref=pd_cp_hi_1

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.

On Sat, Mar 29, 2014 at 1:29 PM, Glen Smith <mrglenasmith at gmail.com> wrote:

> 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. "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."
>
> 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?
>
> Glen
>
> - Thumbed one letter at a time on a 2.25 x 1.25 inch Galaxy smartphone
> keyboard, please forgive any errors.
> On Mar 29, 2014 10:34 AM, "Jeffrey Crews" <cruzetti at gmail.com> wrote:
>
>> Martin et al:
>>
>> 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.
>>
>> jsc
>>
>>
>> On Sat, Mar 29, 2014 at 10:01 AM, Martin Brooke <martin.brooke at duke.edu>wrote:
>>
>>> Probably
>>> https://www.sparkfun.com/products/10972
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Fri, Mar 28, 2014 at 2:58 PM, Pete Soper <pete at soper.us> wrote:
>>>
>>>>  Which low cost sensor are you leaning toward?
>>>> -Pete
>>>>
>>>> On 03/28/2014 02:02 PM, Martin Brooke wrote:
>>>>
>>>>  I am going to have a go at the Ocean X prize and was thinking of
>>>> using a low cost solid state pH sensor.
>>>>  I wondered if there were any tips or advice.
>>>>
>>>>
>>>>
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>>>
>>> --
>>>
>>> Martin Brooke
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-- 

Martin Brooke

-- 
 *Martin Brooke*
Associate Professor,
and Philip Baugh Scholar
Department of Electrical and Computer Engineering <http://www.ee.duke.edu>
Box 90291
Duke University <http://www.duke.edu/>
Durham, NC 27708-0291

*Phone:* (919) 660-5504
*Secretary:*  (919)-660-5252
*Fax:*   (919)-660-5293
*E-Mail:* mbrooke at ee.duke.edu

*Office:*

3581 FCIEMAS Building
3rd Floor South Wing
Duke University
Durham, NC 27708

*Physical Delivery Address:*

Department of Electrical and Computer Engineering
130 Hudson Hall
Duke University
Durham, NC 27708
Phone: (919)-660-5252

[Home] <http://www.ee.duke.edu/%7Embrooke/index.html>
[Academic<http://www.ee.duke.edu/%7Embrooke/00courses.html>
][Research] <http://www.ee.duke.edu/%7Embrooke/00research.html> [
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