Hach sension6, Инструкция по эксплуатации, Страница: 43 / 86

42
SECTION 3,
continued
the concentration of dissolved substances in the sample change.
The adjusted salinity value will change the displayed DO
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
CAL
key.
3. Press the
READ ENTER
key twice to skip the barometric
pressure and altitude entries.
4. Use the keypad to enter the sample salinity value. Press the
READ ENTER
key. The display will show
100%
.
5. Use the keypad to enter the DO concentration of the sample
determined by an alternate technique.
6. Press the
READ ENTER
key. The meter will complete the
calibration then return to the read mode.
3.3.6 Calibrating a Sample to Read 100% Saturation
The sens
ion
6 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 44 . Make sure that no air bubbles are trapped in the
sensing area of the probe tip.
3. Press the
CAL
key located in the lower left corner of the
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.