Setting Up the Meter
Installing
the Battery (Fig 2) Carefully remove the meter from the
carrying case making sure you don’t lose the small screwdriver
and detergent in a small plastic bag.
To install/change the battery, do the following:
1. Insert your thumb in the recessed area of the
battery compartment door and pull it away from the display.
2. Snap the 9V alkaline battery into the battery
clip.
3. Place the battery clip/battery assembly at the
top of the battery compartment.
4. Replace the battery compartment door and snap
into place. |
Figure 2. Installing the Battery
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Setting Up the Electrodes
When you are ready to take your measurement(s), you must first
remove the protective covers (caps) that are in place for storage.
The pH electrode has the soaker bottle in place to protect
the glass bulb inside the plastic sleeve, to protect from contamination
and to prevent the electrode from drying out. The red cover (cap)
covers the conductivity electrode, preventing fluid from
entering the electrode when only pH is being measured and reduces
the need for cleaning.
Setting
Up the pH Electrode (Fig 3)
To remove the soaker bottle,
1. Extend the electrode pair to the 90° position.
2. Hold part of the electrode shafts and the white
cap with one hand.
3. With the thumb and forefinger of the other hand
loosen the bottle a couple of turns and slide the bottle
and cap off carefully.
To put the bottle back on the electrode shaft, reverse
the process stated above.
Setting Up the Conductivity Electrode
To remove the cap, merely pull it off of the electrode
shaft. |
Figure 3. How to Loosen
Bottle
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Calibrating
the Meter
The meter is factory calibrated prior to shipping. However, since
the electrode outputs change with age and condition it is important
to calibrate with fresh pH buffers and known conductivity solutions
prior to each use. Zero and span adjustments interact during calibration.
Repeat calibration sequence at least two times or until readings
stabilize. Rinse electrode in a separate distilled or deionized
water container before dipping the electrode in pH7 solution to
avoid contamination. Cross contamination of calibration standards
will cause the appearance of “drift” in the instrument.
pH Mode
For best results, calibrate pH with a buffer that is within 3
pH units of the test sample.
1. Rinse the pH electrode in distilled or deionized water.
2. Insert in a fresh pH7 buffer solution.
3. Slide back the battery compartment door to the first
stop, exposing the adjustment potentiometers (pots). Refer to
Figure 1.
4. Adjust the CAL pot until the display reads 7.00.
5. Remove electrodes, rinse in distilled or deionized water
and insert in a pH4 or pH10 buffer solution.
6. Adjust the SLOPE pot until the display reads the correct
value.
Conductivity Mode
1. Rinse electrodes thoroughly by agitating in distilled
or deionized water.
2. Wipe off conductivity electrode and allow it to dry.
3. When dry, conductivity should read “0” in air.
4. Adjust ZERO pot if reading is incorrect. If the
conductivity electrode does not zero, it may indicate dried solids
on the sensor. Clean with a mild detergent solution (such as Ivory).
5. Immerse electrode in a known conductivity solution.
Choose a conductivity calibration solution that is near the range
of the samples to be measured. Adjust SPAN pot to desired
conductivity value.
6. Rinse electrodes and return to storage compartment.
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