Hanna Instruments HI 2221 User Manual

Page 7

3 cm

(1¼")

OPERATIONAL GUIDE

POWER CONNECTION

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 mains line.

ELECTRODE AND PROBE CONNECTIONS

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 and the
pin to the reference socket.
Note: 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 measurement and automatic temperature compensation
connect the temperature probe to the appropriate socket.
INSTRUMENT ST

INSTRUMENT ST

INSTRUMENT START

ART

ART-UP

-UP

• Turn the instrument on by pressing the ON/OFF switch located on

the rear panel.

• All LCD tags are displayed and a beep is sounded while the instrument

performs a self test.

• The instrument will display “LoAD” message and “ ” blinking until

initialization is complete.

• The “Unscrew electrode refilling cap” message reminds the user

to loosen or remove the electrode refilling cap to improve the electrode’s
response time.

• The instrument automatically defaults to pH measurement mode

unless a HANNA P type ORP electrode is detected.

pH MEASUREMENT

pH MEASUREMENT
Make sure the instrument has been calibrated before
taking pH measurements.
• Submerse the tip of a properly conditioned

electrode (see page 34) and the temperature

This manual is related to the following products:

HI 2223