Hach sension6, Instruction Manual, Page: 41 / 86

40
SECTION 3,
continued
7. Press the
READ ENTER
key. The display will show the current
value 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
READ ENTER
key. The current
value for the sample salinity (
0/00
) will be shown.
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
READ ENTER
key. The display will show
100%
.
d. Press the
READ ENTER
key. The stabilizing icon will
appear while the meter completes the calibration.
9. When the calibration is complete, the meter will return to the
read mode. Press the
EXIT
key during the calibration sequence
to back out of the calibration routine, one screen at a time,
without completing a calibration.
To obtain a printout of the calibration conditions, use the
DO meter with the Docking station:
1. Press the
PRINT
key on the keypad immediately after a
calibration is completed. The barometric pressure printed will
be the calculated true pressure based on the pressure and
altitude entries.
3.3.5 Calibration to a Known Dissolved Oxygen Concentration
The sens
ion
6 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.