Hanna Instruments HI 2214 - Manual (Page 12)

12
FOUR, THREE OR TWO-POINT CALIBRATION
• Proceed as described in “FIVE-POINT CALIBRATION” section.
• Press CAL after the fourth, third or second calibration point was
confirmed. The instrument will memorize the calibration data and
return to measurement mode.
ONE-POINT CALIBRATION
Two SETUP selectable options are available: “ Pnt” and “OFFS”.
If the “ Pnt” option is selected, the new calibration point overrides an
existing 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. The
instrument will memorize the one-point calibration data and return
to measurement mode.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected
buffer, the “ READY” tag will be displayed and the
“ CFM” tag will blink.
• Press CFM to confirm calibration.
• The calibrated value is then displayed on the
primary LCD and the fifth expected value on the
secondary LCD.
• After the fourth calibration point is confirmed, submerse the pH
electrode and the temperature probe approximately 3 cm (1¼”)
into the next 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 “ READY” tag will be displayed and the
“ CFM” tag will blink.
• Press CFM to confirm the fifth calibration point.
• The instrument stores the calibration value of the
fifth point and returns to normal measurement mode.