Manual

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.