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.
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