11
To calibrate pH:
1.
If necessary, press the MODE key to select pH
measurement mode. The pH indicator appears in the
upper right hand corner of the display.
See Figure 10
2.
Rinse the pH electrode thoroughly with de-ionized water or
a rinse solution. Do not wipe the probe; this causes a build-
up of electrostatic charge on the glass surface.
3.
Dip the pH electrode into the standard calibration buffer
(see page 10 for list of possible buffers). The end of the
probe must be completely immersed into the sample.
Stir the probe gently to create a homogeneous sample.
NOTE: The temperature element is in the conductivity/TDS
cell. For temperature compensated readings, dip the
conductivity/TDS cell into the calibration buffer as well.
4.
Press CAL/MEAS to enter pH calibration mode. The
CAL indicator lights. The primary display will show the
measured reading while the smaller secondary display will
indicate the pH standard buffer solution.
See Figure 11
5.
Wait for the measured pH value to stabilize. If the
READY indicator has been activated (set up program
P3.1—see page 28), the READY annunciator lights when
the reading is stable.
6.
Press ENTER to confirm calibration. The meter is now
calibrated to the current buffer. The lower display scrolls
through the remaining buffer options.
• If you are performing multipoint calibration, go to step 7.
• If you are performing one-point calibration, go to step 9.
7.
Rinse the electrode with de-ionized water or a rinse
solution, and place it in the next pH buffer.
8.
Follow steps 5 to 8 for additional calibration points.
9.
When calibration is complete, press CAL/MEAS to return
to pH measurement mode.
See Figure 12
Notes
To exit from pH Calibration mode without confirming
calibration, DO NOT press ENTER in step 6. Press
CAL/MEAS instead.
If the selected buffer value is not within ±1.0 pH from the
measured pH value: the electrode and buffer icon blink and
the ERR annunciator appears in the lower left corner of the
display.
To select USA or NIST buffer sets, see Set up Program P3.3
on page 29.
To limit the number of pH buffer values available during cali-
bration, see Set up program P3.2 on page 28.
ATC
READY
MEAS
C
pH
READY
CAL
pH
pH
ATC
READY
MEAS
C
pH
Figure 10
Figure 11
Figure 12
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