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There are three calibration functions and procedures that can be accessed through the
CAL
button.
These are calibration of the probe (
DO
), calibration of the barometer (
Pressure
) and calibration of the
temperature (
Temp
). Prepare the dissolved oxygen probe according to the instructions from
GETTING
STARTED
(page 11).
No conditioning period is required when using a
HI764113
DO
probe.
Store the
HI764113
probe in the
HI98198
carrying case when not in use. For short term storage the
probe can also be stored in a beaker of deionized water or in storage cap (when shield is removed).
DO CALIBRATION
General Calibration Guidelines:
1. Before calibration, rinse the probe with clean water to remove debris from the probe body; wipe
with a lint free cloth.
2. Remove the protective shield and set aside.
3. Inspect. Visually inspect the Smart Cap
™
for biofouling. If necessary, use a mild detergent and a soft bristled
toothbrush to clean the probe and Smart Cap
™
. A scratch in the black protective layer on the Smart Cap
™
will affect the calibration (and measurement). Replace the Smart Cap
™
if the sensing surface has been
compromised.
4. Rinse the cap with water after cleaning and dry with a laboratory tissue.
5. Discard zero oxygen solution in an appropriate manner after use (do not return to bottle). Follow
local disposal regulations.
6. Confirm all water droplets have been removed from the cap surface as well as the temperature
element before performing the calibration procedure in water saturated air.
Calibration of the
HI764113
optical dissolved oxygen probe may be performed several different ways:
•
Single point automatic zero calibration at 0% saturation or 0 mg/L
•
Single point automatic slope calibration at 100% saturation or 8.26 mg/L
•
Two points automatic calibration at 0% saturation (0 mg/L) and 100% saturation (8.26 mg/L)
•
Single point manual calibration using a standard value set by the user in % saturation or mg/L.
Any 0% (or mg/L) calibration is made exposing the probe to an environment with the absence of
oxygen (such as Hanna
HI7040
solution), a nitrogen sparging, or other oxygen scavengers.
A 100% calibration is best made in water saturated air, however air‑saturated water is also acceptable.
A single point manual calibration may be made by comparing the displayed value to a determination
made by a reference method (such as the Winkler titration), or a reference probe in the same sample.
Notes: Temperature and Pressure calibration (if required) should be made prior to the probe
calibration. Before attempting the calibration, the probe and standards must be prepared.
Remove the protective guard from the probe.
CALIBRA
TION
CALIBRA
TION
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