Hanna Instruments HI 2221 User manual

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Instruction Manual
HI2221 - HI2223
pH/mV/ºC
Bench Meters
with Calibration Check
www.hannainst.com

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Dear Customer,
Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using these
instruments.
This manual will provide you with the necessary information for correct
use of these instruments, as well as a precise idea of their versatility.
If you need additional technical information, do not hesitate to e‑mail
us at [email protected] or view our worldwide contact list at
www.hannainst.com.
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner.

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PRELIMINARY EXAMINATION ..........................................................4
GENERAL DESCRIPTION..................................................................4
FUNCTIONAL DESCRIPTION.............................................................5
HI2221 SPECIFICATIONS ...............................................................6
HI2223 SPECIFICATIONS ...............................................................7
OPERATIONAL GUIDE.....................................................................8
pH CALIBRATION .........................................................................10
ENHANCED CALIBRATION MESSAGES ............................................14
ELECTRODE CONDITION AND ELECTRODE RESPONSE TIME ..............16
pH BUFFER TEMPERATURE DEPENDENCE ......................................17
GOOD LABORATORY PRACTICE (GLP)..............................................18
LOGGING.....................................................................................21
SETUP........................................................................................24
TEMPERATURE CALIBRATION (for technical personnel only) .............27
mV CALIBRATION (for technical personnel only)..............................29
PC INTERFACE .............................................................................30
ELECTRODE CONDITIONING AND MAINTENANCE.............................34
TROUBLESHOOTING GUIDE ..........................................................37
TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS.................38
ACCESSORIES..............................................................................39
TABLE OF CONTENTS

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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, please contact your local Hanna Instruments Office.
Each instrument is supplied complete with:
• HI1131P Glass‑body Combination pH Electrode with 1 m
(3.3“) cable
• HI7662 Temperature Probe
• HI76404N Electrode Holder
• pH4.01 & 7.01 Buffer Solutions (20 mL each)
• HI7082 Electrolyte Solution
• HI700661 Cleaning Solutions (20 mL each)
• 12 VDC Power Adapter
• Instruction Manual
• Quality Certificate
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.
HI2221 and HI2223 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.
Other features include: up to five pH point calibration with seven mem‑
orized buffers (1.68, 4.01, 6.86, 7.01, 9.18, 10.01 and 12.45 pH),
logging up to 100 samples (for HI2221) and 500 samples (for HI2223),
GLP, calibration due alarm, pH reading with manual or automatic
temperature compensation and PC software interface.
PRELIMINARY EXAMINATION
GENERAL DESCRIPTION

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FUNCTIONAL DESCRIPTION
Front Panel
Rear Panel
1) Liquid Crystal Display (LCD).
2) CAL key, to enter and exit calibration mode.
3) CFM/GLP key, to confirm calibration, different values or to display
Good Laboratory Practice information.
4) °C key, to manually increase temperature value or other
parameters.
5) °C key, to manually decrease temperature value or other
parameters.
6) SETUP key, to enter/exit SETUP mode.
7) RANGE key, to select measurement range, switch to focused data
in SETUP or to toggle between buffer value and temperature during
calibration.
8) LOG/CLR key, to store a value into memory, to clear pH calibration,
or to delete log records.
9) RCL key, memory recall.
10)ON/OFF switch.
11)Power supply socket.
12)USB connector.
13)BNC electrode connector.
14)Temperature probe socket.
15)Electrode reference socket.

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HI2221 SPECIFICATIONS
Range
–2.00 to 16.00 pH
±699.9 mV
±2000 mV
–20.0 to 120.0 °C (‑4.0 to 248.0 °F)
Resolution
0.01 pH
0.1 mV (±699.9 mV)
1 mV (±2000 mV)
0.1 °C
Accuracy
@ 20 °C/68 °F
±0.01 pH
±0.2 mV (±699.9 mV)
±1 mV (±2000 mV)
±0.2 °C (excluding probe error)
Calibration Check Yes
Computer Interface Opto‑isolated USB
pH Calibration Automatic up to 5 points, 7 buffers available
(1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45)
Logging 100 points
Temperature
Compensation
Manual or Automatic from:
–20.0 to 120.0 °C (–4.0 to 248.0 °F)
pH Electrode HI1131P glass body, double junction refillable
cell, BNC + pin (included)
Temperature Probe HI7662 stainless steel probe (included)
Input Impedance 1012 ohm
Power Supply 12 VDC adapter (included)
Environment 0 – 50 °C (32 ‑– 122 °F)
max RH 95 % non condensing
Dimensions 235 x 222 x 109 mm (9.2 x 8.7 x 4.3”)
Weight 1.3 Kg (2.9 lb);
kit with holder 2.1 Kg (4.6 lb)
Warranty 2 years

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HI2223 SPECIFICATIONS
Range
–2.00 to 16.00 pH
–2.000 to 16.000 pH
±999.9 mV
±2000 mV
–20.0 to 120.0 °C (‑4.0 to 248.0 °F)
Resolution
0.01 pH
0.001 pH
0.1 mV (±999.9 mV)
1 mV (±2000 mV)
0.1 °C
Accuracy
@ 20 °C/68 °F
±0.01 pH
±0.002 pH
±0.2 mV (±999.9 mV)
±1 mV (±2000 mV)
±0.2 °C (excluding probe error)
Calibration Check Yes
Computer Interface Opto‑Isolated USB
pH Calibration Automatic up to 5 points, 7 buffers available
(1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45)
Logging 500 points
Temperature
Compensation
Manual or Automatic from:
–20.0 to 120.0 °C (–4.0 to 248.0 °F)
pH Electrode HI1131P glass body, double junction refillable
cell, BNC + pin (included)
Temperature Probe HI7662 stainless steel probe (included)
Input Impedance 1012 ohm
Power Supply 12 VDC adapter (included)
Environment 0 – 50 °C (32 – 122 °F)
max RH 95 % non condensing
Dimensions 235 x 222 x 109 mm (9.2 x 8.7 x 4.3”)
Weight 1.3 Kg (2.9 lb);
kit with holder 2.1 Kg (4.6 lb)
Warranty 2 years

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OPERATIONAL GUIDE
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
For Hanna Instruments 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 Instruments P type (PIN) electrodes are used.
If the electrode is not recognized as a Hanna Instruments 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 START-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 Instruments P type ORP electrode is detected.
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

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RANGE
probe approximately 3 cm (1¼”) into the sample to be tested and stir
gently. Allow time for the electrode to stabilize.
• The pH is displayed on the primary LCD and the temperature on the
secondary LCD.
• The pH reading is out of range, the closest full‑scale value will be
displayed blinking on the primary LCD.
If measurements are taken successively in different samples, it is recom‑
mended to rinse the electrode thoroughly with deionized water or tap wa‑
ter and then with some of the next sample to prevent cross‑contamination.
The pH reading is affected by temperature. In order to measure the pH
accurately, this temperature effect must be compensated for. To use the
Automatic Temperature Compensation feature, connect and submerse
the HI7662 temperature probe into the sample as close
to the electrode as possible and wait for a few minutes.
If the temperature of the sample is known, manual
compensation can be performed by disconnecting the
temperature probe.
The display will show the last recorded temperature
reading with the “°C” symbol blinking.
The temperature can now be adjusted with the ARROW keys (from
‑20.0 ºC to 120.0 ºC).
ORP MEASUREMENTS
An optional ORP electrode must be used to perform ORP measurements
(see Accessories).
Oxidation‑Reduction Potential (REDOX) measurements provide the
quantification of the oxidizing or reducing power of the tested sample.
The surface of the ORP electrode must be clean and smooth in order to
obtain an accurate measurement.

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Calibrate the instrument frequently, especially if high accuracy is required.
For best results and constant display of electrode condition and electrode
response on the bar graph gauges, daily calibration is recommended.
The instrument should be recalibrated:
• Whenever the pH electrode is replaced.
• At least once a day.
• After testing aggressive chemicals.
• If high accuracy is required.
• If “CAL DUE” message is displayed during measurement.
Every time you calibrate the instrument use fresh buffers and perform an
electrode cleaning procedure (see page 36).
PREPARATION
Pour small quantities of the buffer solutions into clean beakers. If possible,
use plastic or glass beakers to minimize any EMC interferences.
For accurate calibration and to minimize cross‑contamination, use two
beakers for each buffer solution. One for rinsing the electrode and one
for calibration.
pH CALIBRATION
Pretreatment solutions are available to condition the
electrode and speed up the response time.
• The instrument automatically defaults to the
mV measurement mode if Hanna Instruments
P type ORP electrode is detected.
• Submerse the ORP electrode tip (3 cm (1¼”) into the sample. Allow
a few minutes for the reading to stabilize.
• The instrument displays the mV reading on the primary LCD.
• If the reading is out of range, the closest full‑scale value will be
displayed blinking on the primary LCD.
TAKING TEMPERATURE MEASUREMENTS
Connect the HI7662 temperature probe and turn the
instrument on. Dip the temperature probe into the sample
and allow the reading on the secondary LCD to stabilize.