30
SECTION 3,
continued
To turn off automatic data transfer:
1. Access setup 10 as described above.
2. Press the
ENTER
key.
3. When the question mark is flashing next to the 10, press the
down arrow until
(off)
appears in the display.
4. Press the
ENTER
key.
5. Press the
EXIT
key. The meter will return to the Read Mode
and automatic data transfer will no longer occur.
3.2
Calibrating the Meter
The sens
ion
8 Dissolved Oxygen meter must be calibrated prior
to use. Prior to calibration, the probe must be prepared and
stabilized. For measurements below 1 mg/L DO, the probe should
be zeroed prior to calibration. See Section 3.3.3 Zeroing the
Probe.
The calibration may be performed in three ways:
•
Calibration may be performed in a water saturated air
environment with a known barometric pressure and/or
altitude. See Section 3.3.4 Calibration in Water Saturated
Air.
OR
•
Calibration may be performed using a water sample that has a
known dissolved oxygen concentration in mg/L. The sample
concentration is determined by another technique such as a
Winkler titration. See Section 3.3.5 Calibration to a Known
Dissolved Oxygen Concentration.
OR
•
Calibration may be performed by setting a water sample to
100% saturation. See Section 3.3.6 Calibrating a Sample to
Read 100% Saturation.
