Hanna Instruments HI 9146 - Manual (Page 14)

14
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 “ NOT READY” 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.
Note: • If the reading is not close to the
selected calibration point,
“
WRONG“ tag will blink.
• If the temperature is out of range
“ WRONG” tag together with the
temperature and “ °C” tag will
blink.
• HI 9146 has automatic buffer recognition function. If the
ARROW keys are pressed to select the desired calibration
value, the automatic buffer recognition function is disabled.