Hanna-instruments HI 98280 Manual de usuario descargar pdf (Pagina 34)

4.3 DISSOLVED OXYGEN CALIBRATION

If the DO % saturation range is calibrated, the DO concentration range will also

be calibrated, and vice versa.

The DO % saturation value is referred to the DO 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 DO concentration values are based on DO % saturation,

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

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

The calibration of the DO % saturation range can be performed at 1 or 2 stan-

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

The calibration of the DO concentration range can be performed at a single

custom point (4 to 50 mg/L).

Choose the “DO calibration” from the “Calibra-

tion” menu, select the DO calibration type using

the arrow keys and press <OK> to confirm.

DO % saturation

The default first calibration point is 100 %.

• Fill the calibration beaker with approximately 4 mm (5/32”) of distilled water

and screw it onto the probe.

• The message “Not ready...” is displayed until a

stable reading is reached.

• To change the calibration value, press the <Cal.

point> softkey and select the desired 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, the “Ready” mes-

sage is displayed. 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.

• Press <Confirm> to store the calibration point.

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Hanna-instruments HI 98280 Manual de usuario Pagina 34