Hanna Instruments HI 221 User Manual
Instruction Manual
HI 221 HI 223
pH/mV/ºC
Bench Meters
with Calibration Check
POOR
GOOD
SLOW
FAST
CAL
C
C
LOG
RCL
GLP
CFM
CFM
RCL
SET/CLR
/GLP
ShowGLP Information
Functions
RANGE
SelectpH/ORP
LOG
StoreLog Information
RecallLog Information
SetInstrument Parameters
ClearLog/Cal Information
CFM
HI 223 Calibration Check
Microprocessor pH Meter
pH Calibration
CAL
StartCalibration
/
Select1
CFM
Confirm
1 Buffer
/
Select2
nd
Buffer
Confirm
nd
2
Buffer
pH
ATC
C
st
Buffer
st
RANGE
SET
CLR
Manufacturer since 1978
www.hannainst.com
1
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
tech@hannainst.com or turn to the back cover for our worldwide contact list.
These instruments are in compliance with directives.
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 maintenance 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 Authorization 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.
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 ................................................................................................................ 9
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 ..................................................................................... 39
2
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.
3
Front Panel
Rear Panel
Front Panel
Front Panel
1
FUNCTIONAL DESCRIPTION
POOR GOOD
Electrode
Response
SLOW
FAST
Primary LCD
pH
Secondary LCD
ATC
C
Electrode
Condition
10
2
3
4
5
6
7
Rear Panel
Rear Panel
Functions pH Calibration
Select pH/ORP
CAL
LOG
GLP
RCL
POWER
12VDC
LOG
Store Log Information
RCL
Recall Log Information
Set Instrument Parameters
SET/CLR
Clear Log/Cal Information
CC
CFM/GLP
Show GLP Information
INPUT TEMP
RANGE
CFM
11
12
CAL
Start Calibration
st
/
Select 1 Buffer
st
CFM
Confirm 1 Buffer
nd
/
Select 2 Buffer
nd
CFM
Confirm 2 Buffer
HI 223 Calibration Check
Microprocessor pH Meter
RS232
13
14
15
RANGE
SET
CLR
8
9
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) RANGE key, to select the measurement range or to switch the focused data.
9) SET / 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.
4
HI 221
SPECIFICATIONS
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HI 223
SPECIFICATIONS
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00.61ot00.2Hp
000.61ot000.2Hp
9.999±Vm
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°0.021ot0.02C
10.0Hp
100.0Hp
°1.0C
10.0±Hp
200.0±Hp
2.0±Vm9.996±(m)V
5.0±Vm9.999±()Vm
°4.0±C
°021ot02C
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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
electrodes 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.
CFM
CAL
DUE
POOR GOOD
CHECK
WRONG
CONTAMINATED
ELECTRODE
CLEAN
SLOW
BUFFER
BUFFER
Unscrew electrode refilling cap
FAST
CLEAR CAL if new electrode
pH
mV
SETUP
LOG
BUFFER 12
ATC
MTC
RCL
DEL
The Unscrew electrode refilling cap message reminds the user to loosen
or remove the electrode refilling cap to improve the electrodes 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 temperature probe into the sample to be tested. Allow time
for the electrode to stabilize.
7
The pH is displayed on the primary LCD and the temperature on the
secondary LCD.
ATC
POOR GOOD
SLOW
FAST
pH
C
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 RANGE key.
POOR GOOD
SLOW
FAST
mV
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
ATC
C
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
MTC
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 quantification 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.
8
C
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 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 HI 7669/2W temperature probe and turn the
instrument on. Dip the temperatureprobeinto the sample and
allow the reading on the secondary LCD to stabilize.
pH CALIBRATION
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.
9
PROCEDURE
The user has a choice of 7 memorized buffers: pH 1.68, 4.01, 6.86, 7.01,
9.18, 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 9.18/
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, 9.18, 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 CLEAR
CAL if new electrode tag will blink.
CAL
CLEAR CAL if new electrode
pH
Press the CLR key if you are using a new electrode or want to clear the
calibration history. The instrument will display the donE 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 BUFFER 1 tags.
The tag will blink until the reading has stabilized.
ATC
10
Press the ARROW keys to select a different buffer value, if necessary.
When the reading is stable and close to the selected buffer, the CFM
tag will blink and if enabled, an audible signal will sound.
ATC
Press the CFM key to confirm the calibration. The instrument will ask for a
second calibration buffer and display the measured pH on the first LCD line
and the second calibration buffer on the second LCD line.
ATC
If necessary, press the ARROW keys to select a different buffer value.
Note: The instrument will automatically skip the buffer used for the first point.
It also skips 6.86 if 7.01 was used, and vice versa. Likewise, it will skip
9.18 if 10.01 has been used, and vice versa.
Rinse the electrode in one of the beakers of the second buffer solution, then
immerse the pH electrode and the temperature probe approximately 4 cm
(1½) into the second buffer solution and stir gently. The temperature
probe should be close to the pH electrode.
The indication will blink on LCD until the reading has stabilized.
When the reading is stable and close to the selected buffer, the
CFM tag will blink.
Press the CFM key to confirm the calibration.
The instrument will return to normal operation and will memorize the calibra-
tion data.
Note: Press the RANGE key any time during calibration to display the
temperature reading.
CAL
ATC
pH
C
ONE-POINT CALIBRATION
Proceed as described in two-point calibration.
Press the CAL key after the first calibration point has been confirmed.
The instrument will return to normal operation and will memorize the one-
point calibration data.
11
ENHANCED CALIBRATION MESSAGES
The stored calibration history to used issue error and warning messages during
calibration to help ensure the highest accuracy.
As electrode aging is normally a slow process, substantial changes from
previous calibrations are likely due to a temporary problem with the electrode
or buffers. Calibrating under these conditions will give measurement errors.
ERROR MESSAGES
Error messages appear if one or all of the calibration parameters are out of
accepted windows. When these messages are displayed calibration cannot be
confirmed.
WRONG BUFFER
This message appears when the difference between the pH reading and the
value of the selected buffer is too big. If this error message is displayed, check
if you have selected the proper calibration buffer.
ATC
CLEAN ELECTRODE
This error message indicates a bad electrode condition (offset out of accepted
window, or slope under the accepted lower limit).
Clean the electrode according to the Cleaning Procedure on page 32 to
improve its condition and repeat the calibration. This ensures the removal of
film, dirt or deposits on the glass bulb and reference junction.
CAL
ELECTRODECLEAN
pH
ATC
BUFFER 1
CHECK ELECTRODE alternating with CHECK BUFFER
This error message appears when electrode slope exceeds the highest accepted
slope limit. You should check your electrode and use fresh buffer.
ATC
12
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