Hanna Instruments HI9126 - Manual (Page 4)

6 7
INITIAL PREPARATION
The meter is supplied with batteries (for details see page 19).
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 the meter's 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 LCD segments and then the
battery percentage while the instrument performs a self check (or as
long as the button is held).
The meter will automatically enter 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 the batteries, the auto-off feature turns the meter off
after 20 minutes (no button pressed). To disable this feature, see
“Setup Menu” section on page 16.
pH MEASUREMENTS
To take a pH measurement remove the electrode
protective cap and 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.
Allow time for the reading to stabilize.
The LCD will show the pH measurement and the temperature of the
sample.
In order to take more accurate pH measurements, make sure that the
instrument is calibrated (see page 10 for details).
The glass bulb and the junction on your electrode should always be
moist, never allow it to dry out.
If several measurements are taken successively in different samples,
rinse the electrode thoroughly with deionized or tap water and a
small amount of the sample to be measured.
The pH reading is directly affected by temperature. In order for the meter
to measure the pH accurately, temperature must be compensated for. If
the sample temperature is different from the temperature at which the pH
electrode was kept, allow a few minutes for thermal equilibration.
To use the meter's Automatic Temperature Compensation feature,
submerse the temperature probe into the sample as close to the
electrode as possible and wait for a few minutes.
If manual temperature compensation is desired the temperature
probe must be disconnected from the instrument
.
The display will show the default temperature of 25 °C, or the last
temperature set the “°C” (or “°F”) indicator will blink.
The temperature can now be adjusted with the ARROW keys.
3 cm
(1¼”)
O P E R A T I O N A L G U I D E O P E R A T I O N A L G U I D E O P E R A T I O N A L G U I D E O P E R A T I O N A L G U I D E O P E R A T I O N A L G U I D E