Thermo Fisher Scientific EcoScan DO 6 - Manual (Page 23)

Instruction Manual DO 6
15
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 DO6 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 DO6 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.
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.
CAL
CAL
T
T
A
A
TA
TA
CAL
HOLD
ENTER
Factory default
Temperature
Measurement
“CO” will display for
1.5 seconds
Figure 8: Temperature Calibration Sequence