Calibration To A Known Dissolved Oxygen Concentration - Hach sension8 Manual

SECTION 3,
continued

3.3.5 Calibration to a Known Dissolved Oxygen Concentration

7. Press the
ENTER
for the altitude. Use the keypad to enter the altitude of the
meter.
Note: If the true barometric pressure has just been entered, the altitude
has to be set to 0 meters (0 feet) or inaccurate calibration
may result.
8. When the altitude is correct in combination with the
barometric pressure, press the
for the sample salinity (
a. Since this calibration is performed in water saturated air,
set the salinity to zero.
b. If necessary, use the keypad to enter a salinity value of
.
0 0/00
c. Press the
ENTER
d. Press the
ENTER
while the meter completes the calibration.
9. When the calibration is complete, the meter will return to the
Read Mode. Press the
sequence to back out of the calibration routine, one screen
one-at-a-time, without completing a calibration.
To obtain a printout of the calibration conditions:
1. Press the
PRINT
calibration is completed. The printed value is the calculated
true pressure based on the pressure and altitude entries.
ion
The sens 8 meter can be calibrated in a water sample of
known dissolved oxygen concentration. This procedure adjusts
for differences between this electrode method and an alternate
method such as a Winkler titration. These differences are most
prevalent in samples containing high concentrations of
dissolved substances.
High concentrations of dissolved substances can be corrected for
by entering a sample Salinity value. However, Salinity values
35
key. The display will show the current value
ENTER
) will be shown.
0/00
key. The display will show
key. The stabilizing icon will appear
key during the calibration
EXIT
key on the keypad immediately after a
key. The current value
.
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