7.
Press the
▼
or
▲
button
until this screen
appears. Press the
REC/ENTER button to calibrate the electrode for pH 7.
8.
Press the
▼
or
▲
button again
until this screen
appears. Press the
REC/ENTER button to calibrate the electrode for pH 4.
9.
Press the
▼
or
▲
button again
until this screen
appears. Press the
REC/ENTER button to calibrate the electrode for pH 10.
10.
The pH electrode has now been calibrated once. To maximize measurement accuracy,
General recommends rinsing the head of the electrode (and the head of the ATC
temperature probe, if used) in distilled water and then repeating the above steps at least
twice more.
11.
To recalibrate the electrode in the future
, you must clear the existing settings. To do
so, press the
▼
or
▲
button until this screen
appears. Then press the
REC/ENTER button to clear the saved settings before repeating the steps above to
calibrate the electrode for pH 7, pH 4 and pH 10.
Normal operation
The PHH-SD1 can measure either the pH or the oxidation-reduction potential (ORP) of a
solution.
1.
To select the type of measurement
, press the
▼
button (which has the word “Function”
stenciled above it) until the display shows either the term “pH” or “mV” (the unit of ORP
measurements).
Following are the default states for the PHH-SD1:
•
pH measurement
•
Temperature unit of
o
C
•
Manual temperature compensation
•
Auto power off
•
Sampling time of 2 seconds
To change any of these parameters, use the specific procedure for it detailed in the Setup section.
2.
To measure the pH of a solution
, press the
▼
button until the display shows the term
“pH”. Make sure the pH electrode is seated firmly in the BNC socket (callout 1-14 of Fig.
1) on the top of the meter. If the ATC temperature probe is being used, make sure it is
seated firmly in its socket (callout 1-13 of Fig. 1) on the top of the meter as well. If the
ATC probe is not being used, perform the last step of procedure to manually match the
compensation temperature to the temperature of the solution being tested.
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