.
- 7 -
shows "CAL" and the lower display shows
the default calibration value (Fig.8).
•
"CAL" will flash on the LCD for around 5
seconds. After that, the meter calibrates
itself automatically. The upper display will
show the calibrated value, the lower display
will show temperature (Fig.9).
•
Rinse the electrode again.
•
To ensure the highest degree of accuracy,
repeat calibration procedures at least two
more times, using fresh solution.
Single Point Calibration
Single point calibration can be performed using the pH7 calibration instruc-
tions. For the most accurate measuring results, two point calibration is
recommended.
3. Procedures for meters that are out-of-calibration by more than 1 pH
of the Calibration Solution.
1 pH of pH 7, (when the measurement is >pH 8 or <pH 6)
1 pH of pH 4, (when the measurement is >pH 5 or <pH 3)
1 pH of pH 10, (when the measurement is >pH 11 or <pH 9)
•
Connect the pH electrode to the
PH BNC INPUT SOCKET
. Slide the
LOCK SWITCH
to the locked position and press the
POWER
button. The
LCD flashes momentarily. Press the
PH/MV
button and select the pH
mode. "PH" is displayed on the LCD.
•
Set the Manual Temperature Compensation value to 77°F/25° (page 5).
•
Rinse the electrode with distilled water and place it into a standard solu-
tion (pH 7, pH 4 or pH 10). The PH reading is displayed on the LCD.
For pH7: Adjust the
PH7 CAL.
until the reading is within pH6 ~ pH8,
pH4: Adjust the
PH4/PH10 CAL.
until the reading is within pH3 ~ pH5,
pH10: Adjust the
PH4/PH10 CAL.
until the reading is within pH9 ~ pH11.
•
Complete the calibration by using the Single or Two Point Calibration
procedures on pages 6 and 7.
C. MEASUREMENT PROCEDURES
1. Temperature
•
Plug the ATC temperature probe into the
OPTIONAL PROBE INPUT
SOCKET
.
•
Slide the
LOCK SWITCH
to the locked position and press the
POWER
See Fig.1, Pg.4 for inputs & button locations
Fig. 8
CAL
4.00
Fig. 9
4.00
25.0
