7
INITIAL PREPARATION
The instrument is supplied with batteries. In order to place the
batteries inside the instrument follow the instructions from page 16.
To prepare the instrument for use, connect the pH electrode and the
temperature probe to the BNC and temperature sockets on the top of
the instrument. The temperature probe can be used independently to
take temperature measurements, or it can be used in conjunction
with the pH electrode to utilize Automatic Temperature Compensation
(ATC) mode. If the probe is disconnected, temperature can also be set
manually with the
ARROW
keys.
Turn the instrument ON by pressing
ON/OFF
.
At start-up the display will show all the LCD segments and then the
battery percentage while the instrument performs a self check (or as
long as the button is held).
The meter automatically enters measurement mode.
After measurement, switch the meter off. Clean the electrode and store
it with a few drops of
HI 70300
storage solution in the protective cap.
To save batteries, the auto-off feature turns the meter off after
20 minutes with no button pressed. To disable this feature, see
“Setup Menu” section on page 14.
pH MEASUREMENTS
Calibrate the meter and pH electrode before
taking measurements. See page 10 for details.
To take a pH measurement remove the electrode’s
protective cap, rinse off pH sensing tip. Submerse
the electrode and the temperature probe 3 cm
(1¼”) into the sample and stir gently.
If necessary, press the
RANGE
key until the
display shows pH mode (
HI 9125
only).
Allow time for the reading to stabilize.
3 cm (1¼”)
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