LaMotte DO 6 Dissolved Oxygen Meter - Manual (Page 16)

Always rinse the probe with either DI water or rinse solution before and after
each calibration/sample measurement. When calibrating in air, make sure that
any water droplets from the probe’s membrane are removed.
For details please refer to Section 8 - PROBE CARE AND MAINTENANCE.
Note: The DO 6 factory calibrated default value is in respect to 760mm Hg or
101.3 kPa barometric pressure (sea level). To set the barometric pressure to
different value, see Section 5.4.1 Pressure Setting Adjustment.
4.3 Temperature Calibration
DO mg/L (ppm) Concentration
measurement is dependent on the
temperature of the sample to be
measured. Most users will choose
to have the DO 6 automatically
compensate for temperature using
the temperature sensor that is
built into the DO probe.
However, it is possible to
manually enter a known
temperature to the meter
(manual temperature
compensation). The built-in
temperature sensor of the DO 6
probe is factory calibrated.
However, the temperature can be
re-calibrated if needed and is
recommended when a
replacement probe is used.
Before calibration, ensure that
the meter displays annunciator
“A” to indicate that it is in
automatic temperature
compensation mode. Please see
Set Up menu on page 36 for its
activation procedure.
1. Switch the meter on. Press
MODE to select temperature
mode. The display should
show the annunciator “T” for
temperature mode and“A”
for automatic temperature compensation mode.
15
CAL
HOLD
ENTER
co
24.3
TA
25.0
TA
“CO” will display for
1.5 seconds
24.3
TA
CAL
25.0
TA
CAL
Factory default
Temperature
Measurement
Figure 9: Temperature Calibration Sequence