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18
Fill the calibration solution cal 100 in
the vessel you have mounted the sen-
sor in. Make sure the sensor surface is
covered completely with the liquid. To
minimize the response time, slightly stir
the solution. Then follow the instructions
in analyzer calibration setting chapter
respectively.
Dry mode calibration – only for DO72-
T-120-AA-VP
• 1st Calibration Point DRY: Nitrogen-sat-
urated atmosphere
As an alternative you can use nitro-
gen-saturated atmosphere as calibration
standard cal 0. Use a commercially avail-
able test gas N2 (5.0).
Lead the gas into a vessel filled with dis-
tilled water before introducing it in the
calibration chamber or a flow-through
cell with installed DO72.
Then follow the instructions in analyzer
calibration setting chapter respectively.
• 2nd Calibration Point DRY: Water va-
por-saturated air
As an alternative you can use water-va-
por saturated air as calibration stan-
dard cal 100. Place wet cotton wool in a
suitable vessel and close the vessel with
a fitting screw top or lid. (For inserting
the sensor into the vessel, you might
have to drill a hole in the lid.) Wait about
2 minutes to ensure that the air is water
.
vapor-saturated
IM12J06J02-00EN-P
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