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6
PH CALIBRATION
The alpha pH 200 controller features seven preset buffer values (pH 1.68, 4.01,
6.86, 7.00, 9.18, 10.01, 12.45) for quick auto-calibration at one or two points.
The
first calibration point must be pH 6.86 or 7.00.
When you calibrate this
instrument, you need to use FRESH standard pH buffer solution that matches
these values.
NOTE: If you are in ORP mode, see Program 3.0 for instructions on switching to
pH mode.
1.
Key in the password “011” using the method described in Section 5.
2.
The display scrolls BUFF and either pH 7.00 or 6.86. You must calibrate at
one of these two buffers for the first calibration. Use
▲
/
▼
keys to select
pH 7.00 or 6.86.
3.
Make sure the electrode is in the buffer solution. In ATC mode, you must
also immerse the temperature sensor in the buffer solution. In the
symmetrically high-resistance measurement mode, you must also immerse
the solution ground (potential equalization pin) in the buffer.
4.
Allow the electrode time to stabilize.
5.
Press ENTER. The instrument will blink with the uncalibrated pH value
corresponding to the mV output of your pH probe.
6.
Press ENTER to confirm the buffer value. The display blinks the calibrated
value twice, shows “DONE” and moves to the next buffer.
NOTE: Buffer must be within ±1.5 pH of the value you are calibrating to or Err1 will
display. To clear the Err1 display and return to calibration mode, press
▲
/
▼
keys together.
NOTE: If the ATC mode has been selected and the Pt 100 is not connected or if it
is broken, the pH display will flash. Under this condition, the calibration will not be
allowed.
Summary of Contents for alpha pH 200
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