Holding the pH electrode by its handle, immerse it in the solution under test. (If you are
using the ATC temperature probe, immerse its head in the solution as well.) Gently shake the
electrode (and probe, if used) to help any air bubbles escape and to ensure an accurate
reading.
The display will simultaneously show the solution’s pH in the center and either the manually
selected compensation temperature or the actual temperature of the solution (as measured by
the ATC probe) below it. By default, the temperature reading will be in
o
C, unless
o
F has
been selected.
3.
To measure the ORP of a solution
, press the
▼
button until the display shows the term
“mV”. Plug an optional ORP electrode with a BNC connector into the same socket on the
top of the meter (callout 1-14 of Fig. 1) that accepts the plug of a pH electrode.
Holding the ORP electrode by its handle, immerse it in the solution under test. Gently shake
the head of the electrode to help any air bubbles escape and to ensure an accurate reading.
The display will show the ORP of the solution, in mV.
Whenever the PHH-SD1 is in measurement mode, you can turn off the backlight (which is on by
default) by briefly pressing (but not holding) the POWER/ESC button. To reactivate the
backlight, briefly press the button again.
Whenever the instrument is in measurement mode, you also can check the current date and time
by briefly pressing the TIME button. Doing so causes both values to appear briefly at the lower
left of the display.
Holding and storing measurements
4.
To hold a measured value
of pH or ORP, press the HOLD/ESC button during the
measurement. Doing so will cause the word “HOLD” to appear at the top of the display.
Pressing the HOLD/ESC button again releases the hold.
5.
To record and recall readings
, press the REC/ENTER button while making
measurements. This will make the term “REC” appear at the top of the display. Pressing
the REC/ENTER button again, briefly, will make the term “MAX” appear to the right of
“REC” and switch the display to the maximum value stored in memory during the last
recording session. Pressing the REC/ENTER button again, briefly, will make the term
“MIN” appear to the right of “REC” and switch the display to the minimum value stored
during the last session.
6.
To exit recording mode,
press and hold the REC/ENTER button for at least three
seconds, until the term “REC” disappears from the top line of the display. The display
will then revert to showing the current reading.
Automatic vs. manual datalogging
The PHH-SD1 can automatically log data at a user-selected sampling period from 1 second to 9
hours. To view the sampling time for which the instrument was set up, press the LOGGER SET
button (which has the words “Sampling check” stenciled below it) once. To change the sampling
time, perform Step 5 of the setup procedure.
7.
To start automatic datalogging
, press the REC/ENTER button once. The top line of the
display will show the term “REC”. Pressing the LOGGER SET button at this point will
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