EUTECH INSTRUMENTS DO 6, Instruction Manual, Page: 25 / 76

Instruction Manual DO 6
20
Figure 12: mg/L (ppm)
Concentration Calibration Sequence
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.
5) Press the CAL key. The display will
show a value which is with respect to
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