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G. Orion 520Aplus, 525Aplus, 720Aplus Dissolved

Oxygen Measurements

Dissolved Oxygen measurements are displayed in ppm when the Orion

9708 Dissolved Oxygen Electrode (Orion 970899) is used with the Orion

520Aplus, 525Aplus and 720Aplus and 920Aplus Meters. Perform the

following steps to prepare the meter and calibrate the electrode.

1. Connect the D.O. electrode Orion 9708 to meter. Leave electrode

mode switch “OFF”.

2. For the Orion 525Aplus and 720Aplus select the correct channel by

pressing 2nd then channel.

3. Disconnect ATC probe.

NOTE: ATC probe must not be connected to the meter

and the meter should be calibrated to pH 7 at 25.0˚C.

4. Press mode until pH mode indicator is displayed.

5. Press hold. Turn the hold feature off.

6. Press measure. Press set temp. Enter 25.0 at the prompt and

press yes.

7. Press calibrate. Enter 1 at the ENTER NO. OF BUFFER prompt

and press yes.

8. Enter 7.00 to the CAL AS prompt and press yes.

9. At the slope prompt enter 100.0 and press yes. The meter

automatically returns to measure mode.

10. Turn the mode switch on the electrode to BT CK. Good battery

operation is indicated by a reading of 13.40 or greater on the meter.

11.Turn the mode switch on the electrode to ZERO. Use the zero

calibration control on the electrode to set the meter to read 0.00.

Orion Benchtop pH/ISE Meter Instruction Manual

Other Measurement Modes

Thermo Orion Aplus Series User Manual

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