15
3. Measurement
Taking pH Measurements
To take readings:
1.
Rinse the pH electrode with deionized or distilled water
before use to remove any impurities adhering to the
probe body. If the pH electrode has dehydrated, soak it
for 30 minutes in electrode storage solution or a 2M–4M
KCl solution.
2.
Press ON to switch on meter.
3.
Press the MODE key to select pH measurement mode.
The MEAS annunciator appears on the top center of the
LCD. The ATC indicator appears in the lower right hand
corner to indicate Automatic Temperature Compensation.
See Figure 19
NOTE:
For pH manual temperature compensation, you
must disconnect the conductivity cell from the 6-pin connec-
tor. The ATC indicator will disappear from the display. You
also need to set a manual temperature compensation
value—see page 21 for directions.
4.
Dip the pH electrode into the sample. Since the conduc-
tivity cell contains the temperature sensor, make sure it is
also immersed in your solution.
When dipping the probe into the sample, the sensor or the
glass bulb of the electrode must be completely immersed
into the sample. Stir the probe gently in the sample to cre-
ate a homogenous sample.
5.
Allow time for the reading to stabilize. Note the reading
on the display. If the Ready indicator is selected on, it will
appear when the reading is stable. See page 18 for more
information.
6.
Press the MODE key to toggle between pH, mV, TDS and
conductivity readings.
More information
• See page 18
for information on the HOLD
function, READY
indicator, and auto endpoint
function.
ATC
READY
MEAS
C
pH
Figure 19
troubleshooting
electrode
care
measurement
calibration
starting up
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appendixes
