Calibrating A Sample To Read 100% Saturation - Hach sension8 Manual

SECTION 3,
continued

3.3.6 Calibrating a Sample to Read 100% Saturation

concentration in mg/L based on the values of the original
calibration. To use this approach:
1. Measure the sample salinity using an Electrolytic
Conductivity meter.
2. Press the key.
CAL
3. Press the
ENTER
and altitude entries.
4. Use the keypad to enter the sample salinity value. Press the
key. The display will show
ENTER
5. Use the keypad to enter the DO concentration of the sample
determined by an alternate technique.
6. Press the
ENTER
then return to the Read Mode.
ion
The sens 8 Dissolved Oxygen meter can be calibrated to read
the dissolved oxygen in a water sample as 100% saturation.
Changes in the dissolved oxygen concentration of the sample
should be monitored using the % saturation mode only because
the concentration in mg/L will not be accurate.
1. Place the electrode in the sample deep enough to fully cover
the thermistor (metallic button) located on the side of
the probe.
2. The sample must have a flow rate or stirring rate that allows
for accurate probe performance. See Section 3.4.2 on
page 39. Make sure that no air bubbles are trapped in the
sensing area of the probe tip.
3. Press the key located in the lower left corner of the
CAL
keypad. The Cal icon will appear in the upper left corner of
the display, a flashing question mark will appear in the upper
right corner of the display, and the keypad icon will appear in
the lower left corner of the display. The main display will
show the current barometric pressure.
37
key twice to skip the barometric pressure
100%
key. The meter will complete the calibration
.