LaMotte DO 6 Dissolved Oxygen Meter - Manual (Page 17)

2. Dip the probe to a solution of known temperature (i.e. a temperature
bath).Allow some time for the reading to stabilize.
3. Press the CAL key. The CAL indicator will appear and blinks above the
display. The temperature value displayed is with respect to the factory
default calibration.
4. Press the
p andq keys to adjust the meter reading to the correct
temperature value (i.e. the temperature of the temperature bath)
5. Press the HOLD/ENTER key to confirm temperature calibration and
return to measurement mode.
NOTE: To exit from Temperature Calibration mode without confirming the
calibration, press CAL instead of HOLD/ENTER. Temperature calibration is
restricted to ± 5°C from the factory
default temperature measurement
displayed during calibration.
4.4 Dissolved Oxygen Calibration in
% Saturation
You can calibrate this meter quickly and
easily in air. The exact calibration value
depends on barometric pressure. The
meter is set to a factory default of 760 mm
Hg, which results in a calibration value of
100% Saturation in air.
NOTE: If the barometric pressure setting
has been changed from 760 mm Hg, the
calibration value in air will automatically
adjust to a value other than 100%. The
adjusted value will be correct for the new
barometric pressure setting.
See Section 5.4.1 Pressure Setting
Adjustment on page 26 to change the
pressure setting.
4.4.1 To calibrate 100% Saturation:
1. Rinse the probe well with DI water or
rinse solution. Do not touch the
membrane.
2. Press the MODE key to select the %
Saturation mode.
16
CAL
HOLD
ENTER
co
83.0
A
CAL
100.0
A
“CO” will display for
1.5 seconds
A value with respect to the
factory default calibration
will be displayed
100.0
85.2
CAL
Calibration point will be
displayed for 1.5 seconds
Figure 10: 100% Saturation Calibration
%
%
%
%