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Pinpoint pH Monitor

  >Date: Thu, 30 Mar 2000 19:03:35 -0500
  >From: Andrew Lester <atlester at home_com>
  >Subject: Pinpoint Ph Monitor
  >Recently as part of my CO2 injection system I purchased a Pinpoint Ph
  >monitor.  The first one I purchased would wildly put out nonsensical
  >readings.  After contacting the manufacture Iwas told that "the glass in
  >the probe had probably shattered and to return it for a new one".  The
  >second one arrived today and after going through a lengthy calibration
  >process my monitor was calibrated.  Now I have the monitor
  >hooked up to the

When you calibrate, forget about using pH 10.01 fluid, it is rarely stable /
accurate and expires prematurely quick.  Use 4.01 and 7.00.  You HAVE TO
ground the sump or aquarium where the electrode is being submerged in.  If
your electrode is in the aquarium but you ground your sump, that is still
NOT good.  Both the pH electrode and the grounding probe have to be in the
same compartment.  It is much easier to manufacturer a good monitor than to
make a good electrode.  When worse comes to worse, return the probe to the
manufacturer, keep the monitor and get a good probe that is stable and long
lasting.  Many of the skinny probes are for intermittent monitoring.  You
should look for one that is thick and is engineered for continuous
monitoring.  They cost more but definitely save you more money in the long
run.  Some DI water should be kept handy to rinse the probe after

There is an article written by Adam Whitlock which is posted onto our site.
Please read that.


Monolith Marine Monsters (m3)

  >aquarium testing the CO2 injection system and after five hours
  >it can not
  >lock onto one or even two readings.   For example it "hunts"
  >between  7.07
  >to 7.10 to 7.09 to 7.12.  It even does this with none CO2 injected
  >water.  Not the kind of accuracy I expected or need.
  >Does anyone else on the list use this product?  Can you offer
  >some insight
  >on what might be going on?  Is this "normal"?
  > From Andrew Lester                     atlester at home_com