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Hanna Instruments HI 3221 - Page 17

Hanna Instruments HI 3221
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17
When the reading is stable and close to the selected buffer, the Confirm
function key is displayed.
Press Confirm to confirm calibration.
The calibrated value and the third expected buffer value will be dis-
played.
After the second calibration point is confirmed, immerse the pH electrode
and the temperature probe approximately 3 cm (1¾”) into a third buffer
solution and stir gently. The temperature probe should be close to the pH
electrode.
If necessary, press the ARROW keys to select a different buffer value.
The “ ” tag will blink on the LCD until the reading is stable.
When the reading is stable and close to the selected buffer, the Confirm
function key is displayed.
Press Confirm to confirm calibration.
Repeat this procedure with two additional pH buffers to encompass the entire
sample pH range.

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