Hanna Instruments HI 2221 Instruction Manual

Also see for HI 2221: Instruction manual

12• After the third calibration point is confirmed, submerse the pH electrodeand the temperature probe approximately 3 cm (1¼”) into the nextbuffer solution and stir gently. The temperature probe should beclose 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 “CFM”tag will blink.• Press CFM to confirm calibration.• After the fourth calibration point is confirmed,submerse the pH electrode and the temperatureprobe approximately 3 cm (1¼”) into the nextbuffer solution and stir gently. The temperature probe should beclose 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 “CFM”tag will blink.• Press CFM to confirm calibration.• The instrument stores the calibration valueand returns to normal measurement mode.FOUR, THREE OR TWO-POINT CALIBRATIONFOUR, THREE OR TWO-POINT CALIBRATIONFOUR, THREE OR TWO-POINT CALIBRATIONFOUR, THREE OR TWO-POINT CALIBRATIONFOUR, THREE OR TWO-POINT CALIBRATION• Proceed as described in “FIVE-POINT CALIBRATION” section.• Press CAL after the fourth, third or second calibration point wasconfirmed. The instrument will memorize the calibration data andreturn to measurement mode.ONE-POINT CALIBRATIONONE-POINT CALIBRATIONONE-POINT CALIBRATIONONE-POINT CALIBRATIONONE-POINT CALIBRATIONTwo SETUP selectable options are available: “Pnt” and “OFFS”.If the “Pnt” option is selected, the new calibration point overrides anexisting one. The adjacent slopes will be reevaluated.If the “OFFS” option is selected, an electrode offset correction is performed.The adjacent slopes will remain unchanged.• Proceed as described in “FOUR, THREE or TWO-POINT CALIBRATION”section.• Press CAL after the first calibration point was confirmed. Theinstrument will memorize the one-point calibration data and returnto measurement mode.