Hanna-instruments HI 9828 Bedienungsanleitung PDF herunterladen (Seite 33)

4.3 DISSOLVED OXYGEN CALIBRATION

If D.O.% saturation range is calibrated, D.O. concentration range will also be

calibrated, and vice-versa.

The D.O.% saturation value is referred to the D.O. concentration in air (100%).

For this reason it is recommended to calibrate the probe near the area where the

measurements will be taken.

Also note that the D.O. concentration values are based on D.O.% saturation,

temperature, salinity and atmospheric pressure. It is recommended to use a stan-

dard solution or a reference D.O. meter to compare readings during calibration.

The calibration of D.O.% saturation range can be performed at 1 or 2 standard

points (0% and 100%), or at a single custom point (50 to 500%).

The calibration of D.O. concentration range can be performed at a single cus-

tom point (4 to 50 mg/L).

4.3.1 Procedure

Choose the D.O. calibration mode in the main

calibration menu, then select the calibration type

using the arrow keys and confirm by pressing OK.

D.O. % saturation

This calibration starts by default with 100 %.

• Fill the calibration beaker with approximately 4

mm (5/32”) of distilled water and screw it on

the probe.

• The message NOT READY is displayed until a

stable reading is reached.

• To change the standard calibration point, press

the CAL. POINT softkey and select the desired

standard point.

• To insert a different calibration value, press CAL.

POINT and then CUSTOM. Insert the desired

value using the keyboard.

• When the reading is stable, READY and CONFIRM appear. Press CONFIRM to

store the calibration point.

• After the first calibration point is confirmed, put the probe in a zero oxygen

standard solution and wait for stable reading.

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Hanna-instruments HI 9828 Bedienungsanleitung Seite 33