10
OPERATIONAL GUIDE
INITIAL PREPARATION
The instrument is supplied complete with 1.5V AA (4 pcs.) batteries. For placing the batteries inside
the meter, see page 54.
To prepare the instrument for field measurements close the serial communication socket and all
unused connector sockets with proper stopper (to ensure waterproof protection). Use the holed
temperature rubber cork for the temperature socket when temperature probe is connected.
For HI98191 connect the pH electrode and the temperature probe to the BNC and temperature
sockets on the top of the instrument. Push the pH electrode sleeve to cover the connector
accommodation.
The temperature probe is used in conjunction with the pH electrode to utilize the instrument's ATC
capability, but it can also be used independently to take temperature measurements. If the probe is
disconnected, temperature can be set manually with the / keys.
For HI98190 connect the pH/temperature electrode to the DIN connector.
Turn the instrument ON by pressing ON/OFF key.
At start‑up the display will show the Hanna logo for a few seconds followed by the percentage
indication of the remaining battery life, then enters the measurement mode.
After measurement switch the instrument off, clean the electrode and store it with a few drops of
HI70300 storage solution in the protective cap (see page 57).
The Auto Power Off feature turns the instrument off after a set period (default 30 min) with no button
pressed to save battery life. To set another period or to disable this feature, see SETUP menu on
page 31.
The Auto Light Off backlight feature turns the backlight off after a set period (default 1 min) with
no buttons pressed. To set another period or to disable this feature, see SETUP menu on page 31.
pH MEASUREMENTS
To take a pH measurement remove the electrode protective cap and simply submerge the tip of the
electrode (4 cm/1½") into the sample to be tested.
Press RANGE key until the display changes to the pH range, if necessary.
Use MODE key to select the pH resolution.
Allow for the electrode to adjust and reading to stabilize (hourglass symbol turns off).
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