Hanna Instruments HI 9828 Instruction Manual

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Hanna Instruments HI 9828 Instruction Manual Manual pdf 32 page image

344.3 DISSOLVED OXYGEN CALIBRATIONIf the DO % saturation range is calibrated, the DO concentration range will alsobe 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 themeasurements 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 singlecustom point (4 to 50 mg/L).Choose the “DO calibration” from the “Calibra-tion” menu, select the DO calibration type usingthe arrow keys and press to confirm.DO % saturationThe default first calibration point is 100 %.• Fill the calibration beaker with approximately 4 mm (5/32”) of distilled waterand screw it onto the probe.• The message “Not ready...” is displayed until astable reading is reached.• To change the calibration value, press the point> softkey and select the desired point.• To insert a different calibration value, press and then . Insert thedesired value using the keyboard.• When the reading is stable, the “Ready” mes-sage is displayed. Press to storethe calibration point.• After the first calibration point is confirmed, put the probe in a zero oxygenstandard solution and wait for stable reading.• Press to store the calibration point.