Hanna Instruments HI 3221 Instruction Manual page 26

FIVE-POINT CALIBRATION (HI 3222 only)
Use part of this procedure for 2, 3 or 4 point calibration.
Press ESC.
• Immerse the ISE electrode approximately 2 cm (¾") into
the less concentrated standard solution and stir gently.
• Press CAL. The primary LCD will displays the ion concentration in the
selected unit or "---" if not calibrated and first standard value.
• If necessary, press the ARROW keys to select a different standard value.
• The " " tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected standard, the Confirm
function key is displayed.
• Press Confirm to confirm calibration.
• The calibrated value and the second expected standard value will be
displayed.
• After the first calibration point is confirmed, immerse the ISE electrode
approximately 2 cm (¾") into the second calibration solution.
• If necessary, press the ARROW keys to select a different standard value.
• The " " tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected standard, the
Confirm function key is displayed.
• Press Confirm to confirm calibration.
• The calibrated value and the third expected standard value will be
displayed.
2 cm
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