LaMotte DO 6 Dissolved Oxygen Meter - Manual (Page 19)

measurement of 10.1% to 49.9%, the
display will show the absolute value
measurement for 1.5 seconds before
displaying Err.1 and goes to the
measurement mode.
5. Press the HOLD/ENTER key to
confirm the calibration. The meter
displays “CO” for 1.5 seconds and
automatically calibrates to 0.0%
Saturation and returns to
measurement mode.
4.5 Dissolved Oxygen Calibration in
mg/L or ppm concentration mode :
Calibrating the meter to 100% Saturation
will also calibrate the concentration mode
at the value in mg/L corresponding to
100% Saturation. This should produce
acceptable results in most applications.
This meter also lets you make a
calibration adjustment in mg/L (ppm)
Concentration mode without affecting
your % Saturation calibration.
To select between mg/L and ppm units,
see page 38
, "Selection of mg/L or ppm
mode" .
4.5.1 To calibrate in mg/L (ppm)
Concentration mode:
1. Calibrate 100% Saturation as per
Section 4.4.
2. Rinse the probe well with DI water or
rinse solution. Wipe the outside of the
probe carefully (do not touch the
membrane).
3. Dip the probe into a sample of known
oxygen concentration. Wait for the
reading to stabilize.
4. Press the MODE key to select the
mg/L (ppm) Concentration mode.
18
CAL
HOLD
ENTER
co
8.16
A
8.24
A
mg/L
“CO” will display for
1.5 seconds
9.00
mg/L
mg/L
8.24
mg/L
Factory default
Temperature
Measurement
Figure 9: Temperature Calibration Sequence
CAL
CAL