PHH-60 and PHH-80
pH/Conductivity Meter
6
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.
