Hanna Instruments HI 221 - Manual (Page 3)

3
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully to
make sure that no damage has occurred during shipping. If there is any
damage, notify your Dealer or the nearest Hanna Customer Service Center.
Each instrument is supplied complete with:
• HI 1131P Glass-body Combination pH Electrode with 1 m (3.3 “) cable
• HI 7669/2W Temperature Probe
• HI 76404 Electrode Holder
• pH 4.01 & 7.01 Buffer Solutions (20 mL each)
• HI 7071S Electrolyte Solution
• 12 VDC Power Adapter
• Instruction Manual
Note: Save all packing material until you are sure that the instrument
functions correctly. All defective items must be returned in the original
packing with the supplied accessories.
GENERAL DESCRIPTION
HI 221 and HI 223 are logging microprocessor-based pH/ORP/temperature
bench meters with Calibration Check.
Calibration Check performs a set of diagnostic tests during calibration using the
history of electrode slope and offset to detect problems that can cause loss of
accuracy.
Calibration Check Features are:
• Enhanced Calibration Messages
During calibration the user is warned if one or more parameters are not suitable
to perform an accurate calibration.
• Electrode Condition on LCD Display
Determined from the electrode offset and slope.
• Electrode response time on LCD Display
Determined from electrode performance during calibration.
• Calibration Alarm Time Out
Can be programmed from 1 to 7 days or can be disabled.
Other features include:
One or two point calibration with seven memorized buffers (1.68, 4.01, 6.86,
7.01, 9.18, 10.01 and 12.45 pH), logging up to 100 samples (for HI 221)
and 500 samples (for HI 223), last calibration date and data (GLP), pH
reading with manual or automatic temperature compensation and PC software
interface.