Hanna Instruments HI 221 User manual

1
Instruction Manual
HI 221 HI 223
pH/mV/ºC
Bench Meters
with Calibration Check
www.hannainst.com
Manufacturer since 1978
Functions pH Calibration
HI 223 Calibration Check
Microprocessor pH Meter
Confirm 2Buffer
nd
CFM
Select 2 Buffer
nd
/
Confirm 1 Buffer
st
CFM
/
Select 1 Buffer
st
Start Calibration
CAL
CFM/GLP
Show GLP Information
Set Instrument Parameters
Clear Log/Cal Information
SET/CLR
RCL
Recall Log Information
LOG
Store Log Information
Select pH/ORP
RANGE
RCL
LOG
CLR
SET
C
C
RANGE
GLP
CFM
CAL
C
ATC
pH
SLOW FAST
POOR GOOD

2
TABLE OF CONTENTS
WARRANTY ................................................................................................................... 2
PRELIMINARY EXAMINATION ........................................................................................... 3
GENERAL DESCRIPTION.................................................................................................... 3
FUNCTIONAL DESCRIPTION ............................................................................................. 4
HI 221 SPECIFICATIONS .................................................................................................. 5
HI 223 SPECIFICATIONS ................................................................................................... 6
OPERATIONAL GUIDE ....................................................................................................... 7
pH CALIBRATION ................................................................................................................
ENHANCED CALIBRATION MESSAGES ....................................................................12
ELECTRODE CONDITION AND RESPONSE TIME ............................................................14
GOOD LABORATORY PRACTICE (GLP) .........................................................................15
LOGGING .........................................................................................................................18
SETUP ............................................................................................................................ 22
TEMPERATURE CALIBRATION (FOR TECHNICAL PERSONNEL ONLY) .............................. 25
mV CALIBRATION (FOR TECHNICAL PERSONNEL ONLY) .................................................. 27
PC INTERFACE ............................................................................................................... 28
pH VALUES AT DIFFERENT TEMPERATURES .................................................................... 30
ELECTRODE CONDITIONING & MAINTENANCE .............................................................. 31
TROUBLESHOOTING GUIDE .......................................................................................... 33
TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS ............................................34
ACCESSORIES ................................................................................................................ 36
RECOMMENDATIONS FOR USERS ..................................................................................... 3
WARRANTY
HI 221 and HI 223 are guaranteed for two years against defects in workman-
ship and materials when used for their intended purpose and maintained
according to instructions. The electrodes and the probes are guaranteed for a
period of six months. This warranty is limited to repair or replacement free of
charge.
Damage due to accidents, misuse, tampering or lack of prescribed mainte-
nance are not covered.
If service is required, contact the dealer from whom you purchased the
instrument. If under warranty, report the model number, date of purchase,
serial number and the nature of the problem. If the repair is not covered by
the warranty, you will be notified of the charges incurred. If the instrument is
to be returned to Hanna Instruments, first obtain a Returned Goods Authori-
zation number from the Technical Service department and then send it with
shipping costs prepaid. When shipping any instrument, make sure it is
properly packaged for complete protection.
Dear Customer,
Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using the instrument.
This manual will provide you with the necessary information for correct use of
the instrument, as well as a precise idea of its versatility.
If you need additional technical information, do not hesitate to e-mail us at
[email protected] or turn to the back cover for our worldwide contact list.
These instruments are in compliance with directives.

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, .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.

4
FUNCTIONAL DESCRIPTION
1) Liquid Crystal Display (LCD).
2) CFM / GLP key, to confirm different values or to display Good Laboratory
Practice information.
3) CAL key, to enter and exit/escape the calibration mode.
4) / ºC key, to manually decrease temperature, or other parameters.
5) / ºC key, to manually increase temperature, or other parameters.
6) RCL key, to enter or exit the recall mode.
7) LOG key, to store measured data.
8) RANG key, to select the measurement range or to switch the focused data.
) S T / CLR key, to enter the Setup mode or clear calibration history.
10) ON / OFF switch.
11) Power supply socket.
12) BNC electrode connector.
13) Pin input socket.
14) Temperature probe socket.
15) RS232 serial communication connector.
Note: Pin input socket cannot be used as a reference input for electrodes with
separate reference.
Functions pH Calibration
HI 223 Calibration Check
Microprocessor pH Meter
Confirm 2 Buffer
nd
CFM
Select 2 Buffer
nd
/
Confirm 1 Buffer
st
CFM
/
Select 1 Buffer
st
Start Calibration
CAL
CFM/GLP
Show GLP Information
Set Instrument Parameters
Clear Log/Cal Information
SET/CLR
RCL
Recall Log Information
LOG
Store Log Information
Select pH/ORP
RANGE
RCL
LOG
CLR
SET
CC
RANGE
GLP
CFM
CAL
Front Panel
Front Panel
Primary LCD
Secondary LCD
C
ATC
pH
SLOW FAST POOR GOOD
1
8
3
2
7
4
6
5
10
9
Electrode
Condition
Electrode
Response
POWER
12VDC
INPUT TEMP
11
12
13
14
Rear Panel
Rear Panel
RS232
15
Front Panel
Rear Panel

5
HI 221
SPECIFICATIONS
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Hp00.61ot00.2
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Vm0002±
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Hp10.0
)Vm.6±(Vm1.0
)Vm0002±(Vm1
C°1.0
ycaruccA
F°86/C°02@
Hp10.0±
)Vm.6±(Vm2.0±
)Vm0002±(Vm1±
C°4.0±
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ecafretnIretupmoC232SRdetalosi-otpO
noitarbilaCHp elbaliavasreffub7,tniop2ro1
)54.21,10.01,81.,10.7,68.6,10.4,86.1(
gniggoLstniop001
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C°021ot02
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6
HI 223
SPECIFICATIONS
egnaR
00.61ot00.2Hp
000.61ot000.2Hp
.±Vm
0002±Vm
°0.021ot0.02C
noituloseR
10.0Hp
100.0Hp
1.0Vm.±()Vm
1Vm0002±()Vm
°1.0C
ycaruccA
F°86/C°02@
10.0±Hp
200.0±Hp
2.0±Vm.6±(m)V
5.0±Vm.±()Vm
1±Vm0002±()Vm
°4.0±C
kcehCnoitarbilaCseY
ecafretnIretupmoC232SRdetalosI-otpO
noitarbilaCHp elbaliavasreffub7,tniop2ro1
)54.21,10.01,81.,10.7,68.6,10.4,86.1(
gniggoLstniop005
noitasnepmoCerutarepmeT :morfcitamotuArolaunaM
°021ot02C
edortcelEHp elballifernoitcnujelgnis,ydobssalgP1311IH
)dedulcni(nip+CNB,llec
eborPerutarepmeT)dedulcni(eborpleetssselniatsW2/667IH
ecnadepmItupnI01
21
9
ylppuSrewoPretpadaCDV21
snoisnemiD47x281x042mm)".2x1.7x4.(
thgieW )bl5.2(gk1.1
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7
OPERATIONAL GUIDE
POWER CONNECTION
Plug the 12 VDC adapter into the power supply socket.
Note: These instruments use non volatile memory to retain the pH, mV,
temperature calibrations and all other settings, even when unplugged.
Note: Make sure a fuse protects the mains 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 and the pin to the
appropriate 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 START-UP
 Turn the instrument on by pressing the ON/OFF switch.
 All LCD tags are displayed and a beep is sounded
while the instrument performs a self test.
 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
Make sure the instrument has been calibrated before
taking pH measurements.
 Submerge the tip (4 cm/1½) of a properly condi-
tioned electrode (see page 31) and the tempera-
ture probe into the sample to be tested. Allow time
for the electrode to stabilize.
CAL CFM
WRONG
DUE
CLEAR CAL if new electrode
CHECK
mV
LOG
ATC
BUFFER 12
RCL
DEL
pH
MTC
BUFFER
CONTAMINATED
ELECTRODE
BUFFER
Unscrew electrode refilling cap
SETUP
CLEAN
SLOW FAST POOR GOOD

8
 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.
 It is also possible to view the mV reading by pressing the RANG key.
If measurements are taken successively in different samples, it is recommended
to rinse the electrode thoroughly with deionized water or tap water 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 submerge the HI 7669/2W 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 then show the default temperature of 25 °C
or 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 quantifica-
tion of the oxidizing or reducing power of the tested sample.
To correctly perform a REDOX measurement, the surface of the ORP electrode
must be clean and smooth.
Pretreatment solutions are avaible to condition the electrode and speed up the
response time.
C
MTC
C
pH
SLOW FAST POOR GOOD
ATC
C
SLOW FAST POOR GOOD
mV
C
ATC

9
 The instrument automatically defaults to the ORP
measurement mode if HANNA P type ORP electrode
is detected.
 Submerge the ORP electrode tip (4 cm/1½) into the
sample. Allow a few minutes for the reading to sta-
bilize.
 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 HI 766 /2Wtemperature probe and turn the
instrument on. Dip the temperatureprobeinto the sample and
allow the reading on the secondary LCD to stabilize.
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 we suggest at least a daily calibration.
The instrument should be re-calibrated:
 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 32).
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

10
ATC
PROCEDURE
The user has a choice of 7 memorized buffers: pH 1.68, 4.01, 6.86, 7.01,
.18, 10.01 and 12.45.
It is always recommended to perform a two-point calibration, however the
instrument also allows a one-point calibration, as described on page 11.
TWO-POINT CALIBRATION
For most applications it is recommended that pH 7.01 or 6.86 buffers be used
as the first calibration point and pH 4.01 (for acidic samples) or pH .18/
10.01 (for alkaline samples) as the second calibration point.
Note: The pH 12.45 buffer is not for general measurement; use only if the
sample is very alkaline to avoid sodium error.
 Immerse the pH electrode and the temperature probe approximately
4 cm (1½) into the buffer solution of your choice (pH 1.68, 4.01,
6.86, 7.01, .18, 10.01 or 12.45) and stir gently. The temperature
probe should be close to the pH electrode.
 Press the CAL key. CAL and pH tags will be on, and the CL AR
CAL if new electrode tag will blink.
 Press the CLR key if you are using a new electrode or want to clear the
calibration history. The instrument will display the don  message for
a few seconds.
It is very important to clear the calibration history when a new electrode is
used because all error and warning messages that appear during calibration
depend on the calibration history.
 Press the CAL key, or wait a few seconds to continue.
Note: The above behavior happens only if calibration history is not empty.
 The instrument will display the measured pH on the primary LCD, and
the most common buffer (7.01) on the secondary LCD along with
CAL, pH and BUFF R 1 tags.
 The   tag will blink until the reading has stabilized.
CLEAR CAL if new electrode
pH
CAL