16
3.4 mg/L or ppm Calibration
Performing a 100% saturation calibration will simultaneously calibrate
the corresponding mg/L (ppm) concentration value. Therefore, an
additional mg/L (ppm) calibration isn’t required in most circumstances.
If desired, a calibration adjustment in mg/L (ppm) can be performed
without affecting the % saturation calibration value.
1. Perform the 100% Saturation
Calibration. See Section 3.3.1 —
100%
Calibration
.
2. Rinse the probe thoroughly with DI
water or rinse solution.
3. Dip the probe into a sample of known
oxygen concentration (i.e. determined
by titration or another instrument). Stir
the solution gently with the probe. Wait
for the reading to stabilize.
4. Press
MODE
to select mg/L (ppm).
5. Press
CAL
. The CAL indicator and
current concentration will display
brief y, before CAL f ashes. The
concentration value based on the
factory default calibration will be
shown.
6. Press
or to adjust the reading to
match the known oxygen concentration
value.
7. Press
HOLD/ENTER
to conf rm the
calibration. The meter will display
“
CO
”, and automatically calibrate to
the entered value, then return to the
measurement mode.
NOTE: The minimum calibration value is 2 mg/L. To prevent erroneous
calibrations, the calibration is limited to ±40% adjustment of the factory
default value.
mg/l
mg/l
mg/l
CAL
CAL
HOLD
ENTER
CAL
mg/l
“CO” will display
for 1.5 seconds
A
A
A value with respect to the
factory default calibration
will be displayed
