To Next Page

To Previous Page

Orion Benchtop pH/ISE Meter Instruction Manual

Calibration and Measurement of Concentration

C. Orion 720Aplus Concentration Calibration

and Measurement

Concentration Calibration Procedure

1. The number of the electrode input in use will appear on the prompt

line. Example: CH-1. To select a different channel press 2nd

then channel.

2. Press mode until the concentration mode indicator CON appears on

the display.

3. Add ionic strength adjuster, or pH adjuster to the standard and

samples,as recommended in the electrode instruction manual.

NOTE: If you want to exit this menu, at any time, press

1st then measure.

4. Press calibrate. CALIBRATE will be displayed as well as the time

and date of the last calibration.

5. When ENTER NO. STDS prompt appears enter the number of

standards to be used in the calibration and press yes.

6. Rinse electrode(s) and place into first standard (the least concentrated

standard). Wait for stable display.

7. When the READY ENTER VALUE prompt appears, enter the

concentration value of the standard and press yes.

8. If two or more standards were selected, repeat steps 6 and 7 for

each standard.

9. If one standard was selected, the electrode slope in mV/decade will be

displayed at the SLOPE prompt. Press yes if correct, or enter the

correct value for the electrode.

NOTE: Make sure the correct polarity sign is entered

for the electrode in use during a one point calibration.

The sign should be + (positive) for cations, for example,

, and - (negative) for anions, for example F

10. If two or more standards were entered, the electrode slope is

calculated and displayed.

11. The meter then advances to MEASURE mode.

12. Rinse and place electrode(s) into the sample. Record concentration

directly from the meter display when the READY prompt appears.

Temperature is displayed in the prompt line.

Thermo Orion Aplus Series User Manual

Questions and Answers: