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Hi Guys

I'm totally new to this. I'm working on a marine project that contains the testing of the ph levels of the sea at different depths. Is there anyone that has an idea of how this works and how will i go about to program the Arduino Uno for this. Any suggestions will be appreciated. smiley-neutral smiley-cry 
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Something like this is a good way to start: https://www.sparkfun.com/products/10972

What is the maximum depth ?  The sensor has to deal with the pressure.
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https://www.tindie.com/shops/rezahussain/arduino-ph-shield-by-dormant-labs/

is a good one too. You should google 'omega engineering' they have ph probes that have threads so you can screw them into things. They also have fittings to help mount them.
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Arduino PH Shield:
http://tinyurl.com/a3ald3f

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First thought: fetch water from different depths and do the PH testing on deck...

What is the frequency of measurements? once per second/minute/hour?
What is the needed accuracy/precision.

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Rob Tillaart

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It looks like the sensor used is good to about 70m depth (690kPa).

I'm guessing its this one: https://www.atlas-scientific.com/product_pages/sensors/ph-sensor.html
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(adds to MarkT post)
This sensor is discussed several times on the forum, if you search in the upper right box
with "atlas scientific ph code" you get several threads with code discussed.
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Rob Tillaart

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