Thermo Fisher Scientific EcoScan DO 6 - Manual (Page 25)

Instruction Manual DO 6
17
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 5.3.1 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.
3) Hold the probe in the air with the sensor
facing downwards. Wait for the reading
to stabilize.
4) Press the CAL key. The display will
show the intended percentage
calibration point (100%) with a CAL
indicator at the top corner for 1.5
seconds. The CAL indicator will then
Figure 9: 100% Saturation Calibration
%
CAL
A
%
HOLD
ENTER
CAL
CAL
%
Calibration point will be
displayed for 1.5 seconds
%
A value with respect to the
factory default calibration
will be displayed
“CO” will displayed for
1.5 seconds
A