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Measuring PH with BS2 — Parallax Forums

Measuring PH with BS2

BjutrasBjutras Posts: 2
edited 2005-04-18 17:24 in BASIC Stamp
Has anyone out there ever used the basic stamp to measure PH. I have an application where I would like to measure the PH of two different materials and sound an alarm or close a valve if the PH level goes out of range. One of the materials has a PH·between 5·and 7 and the other ranges from 8 to 10. one of the electrodes I found produces a voltage of 1.75 in a ph buffer of 7.0. The voltage increases by about 0.25 volts for every PH number decrease and decreases 0.25 volts for every PH number increase. I appreciate the info if anyone has done anything like this.

Comments

  • Tracy AllenTracy Allen Posts: 6,664
    edited 2005-04-16 01:02
    It sounds like the electrode you mention has a preamp with offset built in. Here is a tutorial article about measuring pH with a Stamp...

    www.emesystems.com/OL2ph.htm

    You may have to allow for temperature compensation, and periodic re-calibration.

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    Tracy Allen
    www.emesystems.com
  • BjutrasBjutras Posts: 2
    edited 2005-04-18 17:24
    Thanks for the info Tracy
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