Hanna Instruments HI 120 - Manual (Page 11)

11
POWER CONNECTION
Plug the 12 VDC adapter into the power supply socket.
Notes: • These instruments use non volatile memory to retain the pH,
mV, temperature calibrations and all other settings, even
when unplugged.
• Make sure a fuse protects the main line.
ELECTRODE AND PROBE CONNECTIONS
For HANNA P type pH or ORP electrodes (with internal reference) connect the
electrode’s BNC to the socket on the back of the instrument (#6 on page 4
and 5) and the pin to the appropiate socket (#5 on page 4 and 5).
Notes: • Electrode condition and response information is displayed on the
bar graph gauges during the day the calibration is performed
only if HANNA P type (PIN) electrodes are used.
• If the electrode is not recognized as a HANNA P type electrode,
the bar graph gauges will blink (25 seconds OFF, 4 seconds ON,
full bar graph).
For temperature measurements and automatic temperature compensation,
connect the temperature probe to the appropriate socket.
INSTRUMENT START-UP
• Turn the instrument on by pressing the ON switch.
• All LCD tags are displayed and a beep is heard while the instrument
performs a self test.
• The instrument displays then the date on the primary LCD and the
time on the secondary LCD, along with the “Remove protective cap”
and “Unscrew electrode refilling cap” messages alternatively blinking.
These messages alert the user to follow displayed instructions in order
to take proper measurements and to improve electrode response.
• The instrument automatically defaults to pH or mV measurement
mode, if a HANNA P type pH or ORP electrode is detected.
• If no HANNA P type electrode is detected, the instrument starts in the
same range as it was at power off.
OPERATIONAL GUIDE