Hanna Instruments HI2400 Instruction Manual page 12

• Press CAL. The instrument will return to measure‑
ment mode and will memorize the zero calibration
data. For a two‑point calibration do not press CAL
and follow the procedure below.
SLOPE CALIBRATION
It is suggested to perform the slope calibration in air.
• Rinse the probe in clean water to remove any
residual zero oxygen solution.
Note: If you did not perform the zero calibration procedure, press CAL
and then the ARROW keys to select the 100% DO calibration point.
• Dry the probe tip and allow a few seconds for the LCD reading to
stabilize. The "~" and " " tags will blink until the reading is stable.
• When the reading is stable, "CFM" tag starts blinking. Press CFM
to confirm the "100.0%" DO calibration.
• If the reading is within the limits (±15% f.s.), the
meter stores the value (and adjusts the slope point).
• The instrument stores the slope calibration data and
returns to measurement mode.
Notes: • If the reading is not close to the selected value, "WRONG"
tag will blink.
• If the temperature goes out of range during calibration the
"WRONG", temperature unit tag and both measurements
will blink.
• HI 2400 has automatic buffer recognition function. If the
ARROW keys are pressed to select the desired calibration
value, the automatic buffer recognition function is disabled.
OR
12