Orion Benchtop pH/ISE Meter Instruction Manual
Set Up Self-Test and Check-Out
11
G. Orion 720Aplus and 920Aplus
Check-Out Procedure
1. Perform the self-test.
2. After completing the self-test the meter will be in MEASURE mode.
The legend MEASURE will be displayed.
NOTE: If this is the first time this procedure has been
performed the reading should be 7.000 ± 0.02.
3. Press mode until pH is displayed.
a. Press 2nd channel until channel 1 is selected.
b. The prompt line on the display should read 25.0˚ C. If not, press
1st set temp and enter 25.0, then press yes.
4. For 920Aplus only:
Press 2nd electrode id. Press 1 for pH and press yes.
5. Press 1st calibrate.
a. Press 1 buffer, then press yes.
b. Display should read 6.997. If not, enter 6.997 and press yes at
the READY CAL AS prompt.
c. Meter should display the slope, 100.0 PCT. If not, enter 100.0
and press yes.
d. Meter will return to measure mode. Display should read
6.997 ± 0.02.
6. Press mode to display mV. Display should read 0.0 ± 0.2 mV.
If not, enter 0.0 and press yes.
7. Press mode until CONC is displayed.
a. For 920Aplus only:
Display should read CON and — . Press 2nd electrode id.
Enter 13, (Na+) then press yes.
b. Press calibrate. Enter 1 standard and press yes.
c. Meter should display 1.00. If not, enter 1.00 and press yes at the
READY ENTER VALUE prompt.
d. Meter should display the slope as 59.2 mV. If not, enter 59.2 and
press yes.
e. Meter will return to measure mode. Display should read
1.00 ± 0.01.
8. Press mode to select pH.
a. Press 2nd channel to select input channel 2.
b. Repeat steps 3 through 7 for input channel 2.
9. After successful completion of steps 1 through 7, the meter is ready for
use with electrodes. Remove shorting caps.
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