Thermo Orion 410Aplus, Instruction Manual

Page: 40 / 131

Orion Benchtop pH/ISE Meter Instruction Manual
Special Features
36
Concentration Calibration Procedure
1. Press mode until the concentration mode indicator, CON appears on
the display.
2. Add ionic strength adjuster, or pH adjuster to the standards and
samples as recommended in the electrode instruction manual.
NOTE : If you want to exit this menu, at any time,
press 1st then measure .
3. Press calibrate . CALIBRATE will be displayed as well as the time
and date of the last calibration.
4. When ENTER NO. STDS prompt appears, enter the number of
standards to be used in the calibration and press yes .
5. Rinse electrode(s) and place into first standard (least concentrated
standard). Wait for stable display.
6. When the READY ENTER VALUE prompt appears, enter the
concentration value of the standard and press yes .
7. If two or more standards were selected, repeat steps 5 and 6 for
each standard.
8. 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
Na
+
, and - (negative) for anions, for example F-.
9. If two or more standards were entered, the electrode slope is
calculated and displayed. The meter then advances to
MEASURE mode.
10. Rinse and place electrode(s) into the sample. Record concentration
directly from the meter display when the READY prompt appears.
Temperature is displayed on the prompt line.