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6. HOLD function
This feature lets you freeze the value of the
pH or conductivity reading for a delayed
observation. HOLD can be used any time
when in MEAS mode.
1.
To hold a measurement, press the
HOLD key while in measurement
mode. "HOLD" will appear on the
display.
See Figure
2.
To release the held value, press HOLD
again. Continue to take measurements.
NOTE:
This meter will hold a reading
for up to 30 minutes, because it
features automatic shutoff after
30 minutes to conserve batteries.
pH
ATC
MEAS
HOLD
C
A
A
5. Measurement
The READY indicator appears on the display when the readings stabilize. The read-
ing holds until the measured value exceeds the tolerance, then the READY annuncia-
tor turns off.
NOTE:
Be sure to remove the protective
rubber cap of the electrode before
measurement.
To take readings:
1.
Rinse the probe 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 OAKTON
electrode storage solution or a 2M–4M
KCl solution.
2.
Switch on the meter. The MEAS annun-
ciator appears on the top center of the
LCD. The ATC indicator appears in the
lower right hand corner to indicate
Automatic Temperature Compensation.
Press MODE to select desired measur-
ing parameter (pH or conductivity).
See Figure
3.
Dip the probe into the sample.
NOTE:
When dipping the probe into the
sample, make sure the tip of the
probe is completely immersed. Stir
the probe gently in the sample to
create a homogenous sample. Be
sure to tap probe to remove air bubbles.
Air bubbles will cause errors in the
reading.
4.
Allow time for the reading to stabilize.
Note the reading on the display. When
the reading is stable, the READY
annunciator appears.
5.
To toggle between pH and conductivity
readings, press the MODE key.
See figures and
NOTE:
Conductivity readings are auto-
ranging and will automatically
move to the correct range (four
ranges possible).
ATC
READY
MEAS
µ
S
C
C
pH
ATC
READY
MEAS
C
B
pH
ATC
MEAS
C
A
A
pH measurement mode display
Conductivity measurement mode display
C
B
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