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

[e-mail] 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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9.999±Vm

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°0.021ot0.02C

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

°021ot02C

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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
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.

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 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 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 temperatureprobeinto 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

ELECTRODE

This message appears if the cleaning procedure performed as a result of the
above two messages is found by the instrument to be unsuccessful. Replace the
electrode.

ATC

WRONG BUFFER TEMPERATURE

This message appears if the temperature of the buffer is outside the defined
buffer temperature range.

CAL

WRONG

BUFFER

CLEAR CAL if new electrode

ATC

pH

WARNING MESSAGES

During calibration, the Calibration Check feature analyzes the electrode calibration
history and warns the user when problems have been detected. It is possible to
over ride the warning messages and confirm the calibration but it is not
recommended.

CLEAR CAL IF NEW ELECTRODE

This warning is displayed any time the new calibration parameters are better
than the previous parameters. You can clear the calibration history by press­ing the CLR key, or continue by pressing the CAL key.

CAL

CLEAR CAL if new electrode

pH

ATC

BUFFER 1

CLEAN ELECTRODE

This warning appears during Calibration Check for the second calibration
buffer when the instrument has detected a small variation of offset or both
offset and slope parameters. This variation may result from dirt on the
electrode. Refer to the electrode cleaning procedure. This ensures the removal
of film, dirt or deposits on the glass bulb and reference junction.

CFM

CAL

ELECTRODECLEAN

pH

ATC

BUFFER 1

CLEAN ELECTRODE alternating with CHECK BUFFER
This warning appears during Calibration Check in the first calibration buffer as

13

a result of unacceptable offset variation or in the second calibration buffer as
a result of unacceptable slope variation. This variation may result from dirt on
the electrode or contaminated buffer. Refer to the electrode cleaning procedure
or use fresh buffer.

CAL

CHECK

CFM

BUFFER

ELECTRODECLEAN

pH

ATC

BUFFER 1

CONTAMINATED BUFFER

This warning message appears in order to alert that the buffer could be
contaminated. Refresh your buffer and continue the calibration procedure.

ATC

ELECTRODE CONDITION &

ELECTRODE RESPONSE TIME

When using an appropriate HANNA P Type BNC electrode with pin, HI 221
and HI 223 will assess electrode condition and response time during each
calibration, and display the calibration status for the rest of the day.

POOR GOOD

SLOW

FAST

The digital gauge for electrode condition is a representation of the offset and
slope performance of the electrode. The response gauge is a function of the
stabilization time between the first and second calibration buffers. These
gauges reflect electrode performance and should be expected to slowly de­crease over the life of the electrode.

The condition and response gauges show the electrodes condition at the time
of calibration only and are displayed for the rest of the day the calibration is
performed. For a continuous display of electrode condition at the time of
calibration, daily calibration is necessary. The condition and response are also
visible when viewing GLP data.

If the instrument is not calibrated or it has been calibrated only at one point
or if the calibration history was deleted, the electrode condition and the
electrode response gauges will be empty.

14

SLOW

FAST

POOR GOOD

Also, when the instrument cannot evaluate the electrode response or pH 1.68 or
pH 12.45 buffer were used as calibration buffer, the response gauge will be empty.
If the electrode is in a very poor condition the first condition segment will blink.
If electrode response is very slow the first response segment will blink.

GOOD LABORATORY PRACTICE (GLP)

GLP is a set of functions that allows the storage and retrieval of data regarding
the maintenance and status of the electrode.

All data regarding the last calibration (one or two points) is stored for the user
to review when necessary. This data includes the following: calibration time
stamp, offset (in mV), slope (in mV/pH), electrode condition and response
gauges, calibration buffers and the amount of time until a new calibration is
required.

CALIBRATION ALARM TIME-OUT

HI 221 and HI 223 allow the user to set the number of days before the next
required pH calibration. This value can be set from 1 to 7 days. The default
value is OFF (disabled).

The instrument checks if the time-out time has expired. If the time has
elapsed, the CAL DUE will blink as a reminder.

Note: If the instrument was not calibrated, or if the calibration history was

deleted, the CAL DUE message will be displayed even if this feature is
disabled in the SETUP menu.

If the instrument was calibrated using an electrode with pin and the
electrode is changed with an electrode without pin or vice-versa CAL
DUE will blink. This feature helps ensure use of a calibrated instru­ment.

LAST CALIBRATION DATA

Last calibration data is stored automatically after a successful calibration.
To view the pH calibration data, press the GLP key when the instrument is in

pH measuring mode.
The instrument will display the time of the last calibration.
Press the ARROW keys to view the following logged calibration parameters

(pressing the / ºC key):
_ The time (hh:mm).

15

_ The date (mm.dd).

_ The year (yyyy).

_ The pH calibration offset.

_ The pH calibration slope in mV/pH normalized to 25 °C.

Note: If you calibrate using electrodes with pin the electrode condition and re-

sponse gauges appear while the offset and slope are displayed.

_ The first pH calibration buffer along with any warning messages issued

while calibrating at this point.

_ The second pH calibration buffer along with any warning messages issued

while calibrating at this point.

Note: If the last calibration was a single point calibration, the message for

the second buffer will be: no bUFF.

16

_ The selected resolution of the instrument during calibration (HI 223 only).

CAL

RCL

pH

_ The calibration Alarm Time-Out status:
if disabled

or the number of days until the calibration alarm will be displayed

or if expired (7 days ago)

Press the GLP key at any time and the instrument will return to measuring mode.
If calibration has not been performed, the instrument displays no CAL
blinking.

17

LOGGING

Up to 100 (HI 221) or 500 (HI 223) LOG samples can be stored in memory.

LOGGING THE CURRENT DATA

To store the current reading into memory press the LOG key while in measur­ing mode.

The instrument will display the current date (mm.dd) on the primary LCD, the
record number on the secondary LCD and the LOG tag will blink for a few
seconds (see example below: record No. 27 dated July 14):

If there are less than 5 memory locations remaining, the record number and
the Lo message will blink to alert the user.

If the log space is full, the FULL LOC message will be displayed and no more
data will be saved.

When the LOG key is pressed, a complete set of information is stored. The
parameters of a record are date, time, pH, mV, temperature, and pH
calibration data. If a HANNA P Type ORP electrode is used pH information is
not stored.

VIEW LOGGED DATA

Press the RCLkey to retrieve the information stored while in measuring mode.
If no data were logged the instrument displays:

18

Otherwise the instrument will display log data on the primary LCD and the
last stored record number on the secondary LCD, along with the LOG and
the RCL tags.

Note: The LOG and RCL tags remain on LCD while instrument is in the

viewing logged data mode.

Press the RCL key at any time to return to measuring mode.
Press the ARROW keys to scroll between same parameter for different records,

while pH, mV, temperature, Hour, Year, oFFS, SLoP or dEL record
is displayed:

or to scroll between different dates while dAtE or dEL date is displayed.

LOG

RCL

Press the RANGE key and the instrument will display the next logged
parameter, as follows:

The mV value on the primary LCD and the record number on the secondary
LCD.

The temperature value on the primary LCD and the record number on the
secondary LCD.

The time on the primary LCD and the Hour message on the secondary
LCD.

19

The date on the primary LCD and the dAtE message on the secondary
LCD.

The year on the primary LCD and the YEAr message on the secondary
LCD.

The calibration offset on the primary LCD and the oFFS message on the
secondary LCD.

The calibration slope on the primary LCD and the SLoP message on the
secondary LCD.

Note: Before displaying the Hour, Year, oFFS or SLoP messages, the

record number is displayed for about one second.
The RANGE key has no effect if nuLL record message is displayed on

the first LCD line.

LOG

RCL

or if nuLL date message is displayed.

LOG

RCL

You can skip this message by selecting an undeleted record (date)
using the ARROW keys.

20

The dEL message on the primary LCD and the selected record or date on
the secondary LCD. The CFM and the DEL tags will blink:

Press SET key to select the current record, the records from the selected date or
all records to be deleted.

the date.

or ALL records.

Press the ARROW keys to change the record or the date.
Press the CFM key to confirm the deleting of the selected record, all the records

for the selected date, or all the records and the instrument will display on the
secondary LCD the nuLL message.

LOG

RCL

Note: Pressing RANGE key the instrument skips to the pH information on

the next undeleted record.

 The instrument optimizes the usage of the memory when it returns to

measurement mode after a deleting operation is performed. This will
change the record numbers of logged data.

 If all the records are deleted the instrument returns to the measuring

mode.

 After the LOG key is pressed or dEL is confirmed the instrument will

display the amount of free log space for about one second (example:
25 records free).

LOG

21

SETUP

Setup mode allows viewing and modification of the following parameters:
 Calibration Alarm Time Out
 Instrument ID
 Current Time (hour & minute)
 Current Date (month & day)
 Current Year
 pH Resolution (HI 223 only)
 Beep Status
 Baud Rate (serial communication)
 Command Prefix (serial communication)
To enter the Setup mode press the SET/CLR key while the instrument is in

measuring mode. Press SET/CLR key to exit SETUP mode.
Select a parameter with the ARROW keys.
Press the CAL key to change a parameter value. The selected parameter will

start to blink.
Press the RANGE key to toggle between the displayed parameters.
Press the ARROWkeys to increase or decrease the displayed value.
Press the CFM key to save the modified value or the CAL key to cancel.
Press the ARROW keys to select the next/previous parameter.

CALIBRATION ALARM TIME OUT CHANGE

Press the CAL key when the calibration time out is displayed. Calibration time
out (OFF=disabled or 1 to 7 days) will begin blinking.

Press the ARROW keys to change the calibration time out value.
Press the CFM key to save the modified calibration time out value or press the
CAL key to cancel without saving the calibration time out.

INSTRUMENT ID PARAMETER CHANGE

Press the CAL key when the instrument ID is displayed. The instrument ID
(0000 to 9999) will begin blinking.

22

Press the ARROWkeys to change the instrument ID value.
Press the CFM key to save the modified instrument ID value or press the CAL

key to cancel without saving the instrument ID.
Note: The instrument ID is downloaded to a PC as part of a logged data set

to identify its origin.

CURRENT TIME SET

Press the CAL key when the current time is displayed. The hour will begin
blinking.

Press the ARROWkeys to change the hour.
Press the RANGE key. The minutes will begin blinking.
Press the ARROW keys to change the displayed value.

Press the CFM key to save the modified value or press the CAL key
to cancel without saving the time.

CURRENT DATE SET

Press the CAL key when the current date is displayed. The month will begin
blinking.

Press the ARROWkeys to change the month.

Press the RANGE key. The day will begin blinking.
Press the ARROW keys to change the displayed value.

Press the CFM key to save the modified value or press the CAL key to cancel
without saving the date.

23

CURRENT YEAR SET

Press the CAL key when the current year is displayed. The year will begin
blinking.

Press the ARROWkeys to change the year.
Press the CFM key to save the modified value or press the CAL key to cancel

without saving the year.

pH RESOLUTION SET (HI 223 ONLY)

Press the CAL key when the pH resolution is displayed. The pH resolution
(0.001 or 0.01) will begin blinking.

Press the ARROW keys to change the pH resolution.
Press the CFM key to save the modified pH resolution or press the CAL key to

escape without saving the pH resolution.

BEEP STATUS SET

Press the CAL key when the beep status is displayed. The beep status (On or
OFF) will begin to blink.

Press the ARROWkeys to change the beep status (On or OFF).
Press the CFM key to save the modified beep status or press the CAL key to

cancel without saving the beep status.
Note: If enabled, an audible signal will follow each key press. Inactive keys

have a longer beep. A longer beep is also sounded when the limits of
the range of a parameter are reached.

An audible signal will also sound when the reading becomes stable
during calibration.

24

SERIAL COMMUNICATION BAUD RATE SET

Press the CAL key when the baud rate is displayed. The baud rate (600,
1200, 2400, 4800 or 9600) will begin to blink.

Press the ARROWkeys to change the baud rate.
Press the CFM key to save the modified baud rate or press the CAL key to

cancel without saving the baud rate.

SERIAL COMMUNICATION COMMAND PREFIX SET

Press the CAL key when the command prefix is displayed. The command prefix
(0 to 47) will begin to blink.

Press the ARROW keys to change the command prefix.
Press the CFM key to save the modified command prefix value or press the CAL

key to cancel without saving the command prefix.
Note: See the PC Interface section on page 28 for a complete explanation. The

command prefix must be 16 if the HI 92000 PC software is used.

TEMPERATURE CALIBRATION

(FOR TECHNICAL PERSONNEL ONLY)

The instruments are factory calibrated for temperature.
Hannas temperature probes are interchangeable and temperature calibra-

tion is not necessary when replaced.
If the temperature measurements are not accurate, temperature recalibration

should be performed.
For an accurate recalibration, contact your dealer or the nearest Hanna

Customer Service Center, or follow the instructions below.
 Switch off the instrument.
 Prepare a vessel containing ice and water and another one containing hot

water (around 50 °C). Place insulation material around the vessels to

minimize temperature changes during calibration.
 Use a ChecktempC or a calibrated thermometer with a resolution of 0.1 °C

as a reference thermometer.
 Immerse the temperature probe and the ChecktempC into the vessel

25

containing ice and water. Wait a few minutes for the probe to stabilize.
 Press the CAL and LOG keys simultaneously and then switch the instru-

ment on. After a few seconds, the instrument enters the temperature

calibration mode. The CAL tag will come on. The primary LCD will

display the measured temperature or the - - - - message if the

measured temperature is out of range. The secondary LCD will display 0.0 °C

(First calibration point). The  tag will blink until the reading has

stabilized.
 Use the ARROW keys to set the reading on the secondary LCD to that of

ice and water measured by ChecktempC (for example, -0.1 °C).

CAL

C

-0.1°C

 When the reading is stable and close to the selected calibration point, the

CFM tag will blink.
 Press the CFM key to confirm the calibration or the CAL key to leave the

calibration mode.
 The secondary LCD will display 50.0 °C (Second calibration point).
 Immerse the temperature probe and the ChecktempC into the second

vessel.
 Allow a few minutes for the probe to stabilize.

 The   tag will blink until the reading has stabilized.
 Use the ARROW keys to set the reading on the secondary LCD to that of

the hot water bath.
 When the reading is stable and close to the selected calibration point, the

CFM tag will blink.

CFM

CAL

C

 Press the CFM key to confirm the calibration or the CAL key to leave the

calibration mode.
Note: If the measured value is not close enough to the displayed value on

secondary LCD, the WRONG  tag will blink. In this case, check if the
value set on secondary LCD and the temperature measured with
ChecktempC are close. Change the temperature probe and restart
calibration if necessary.

26

mV CALIBRATION

(FOR TECHNICAL PERSONNEL ONLY)

All instruments are factory calibrated for mV.
Hannas pH and ORP electrodes are interchangeable and mV calibration is

not needed when replaced.
If the mV measurements are not accurate, mV recalibration should be carried

out.
For an accurate recalibration, contact your dealer or the nearest Hanna

Customer Service Center or follow the instructions below.
A two or three point calibration can be performed at 0 mV, +600 mV and

+1800 mV.
 Switch off the instrument.
 Attach a mV simulator with an accuracy of at least ±0.1 mV to the BNC

connector.
 Press the RCL and CFM/GLP keys simultaneously and switch the instru-

ment on. After a few seconds, the instrument enters the mV calibration

mode.
 The primary LCD will show the CAL and mV tags along with mea-

sured mV and the secondary LCD will display 0.0 calibration point.
 Set 0.0 mV on the simulator.

 The   tag will blink on LCD until the reading has stabilized.
 When the reading is stable, the CFM tag will blink.
 Press the CFM key to confirm the calibration.
 The instrument will prompt for a second calibration point and will display

600 on the secondary LCD line.
 Set the simulator to +600.0 mV.

 The   tag will blink on the LCD until the reading has stabilized.
 When the reading is stable, the CFM tag will start to blink.
 Press the CFM key to confirm the calibration.
 The instrument will prompt for a third calibration point and will display

1800 on the secondary LCD line.
 The two-point mV calibration is now complete.
 Set +1800.0 mV on the simulator.

 The   tag will blink on the LCD until the reading has stabilized.
 When the reading is stable, the CFM tag will start to blink.
 Press the CFM key to confirm the calibration.
 The instrument will memorize the calibration and return to measuring

mode.

27

Note: Press the CAL key to leave the calibration mode at any time.

If the measured value is not close to the calibration point, the WRONG
tag will start to blink. In this case, check if the value set on the
simulator is the same as the calibration value on the instrument. Set
the proper value on the simulator.

PC INTERFACE

Data transmission from the instrument to the PC can be done with the HI
92000 Windows® compatible software (optional). The HI 92000 also offers
graphing and on-line help.

Data can also be exported to the most popular spreadsheet programs for
further analysis.

To connect your instrument to a PC, use the optional Hanna HI 920010 cable.
Make sure that your instrument is switched off and plug one end into the
instruments RS232C socket and the other end into the serial port of your PC.

Note: Cables other than HI 920010 may use a different configuration, in

which case communication between the instrument and the PC may
not be possible.

If you are not using optional Hanna HI 92000 software, please see the
following instructions.

The Command Prefix must be 16 when using HI 92000 software.

SENDING COMMANDS FROM PC

It is also possible to remotely control the instrument with any terminal pro­gram. Use the optional Hanna HI 920010 cable to connect the instrument to
a PC, start the terminal program and set the communication options as
follows: 8, N, 1, no flow control.

COMMAND TYPES

To send a command to the pH meter the scheme is:

<command prefix> <command> <CR>

where: <command prefix> is a selectable ASCII character

between 0 and 47 (default 16).
<command> is the command code (3 characters).

Note: Either small or capital letters can be used.

28

SIMPLE COMMANDS

RNG Is equivalent to pressing the RANGE key
CAL Is equivalent to pressing the CAL key
CFM Is equivalent to pressing the CFM/GLP key
UPC Is equivalent to pressing the UP arrow key
DWC Is equivalent to pressing the DOWN arrow key
SET Is equivalent to pressing the SET/CLR key

COMMANDS REQUIRING AN ANSWER

pH? Causes the instrument to send the pH reading (Err 1 is sent if

out of range). If the range is set to mV, Err 6 is received.

MV? Causes the instrument to send the mV reading (Err 2 is sent if

out of range). If the range is set to pH, Err 6 is received.

TM? Causes the instrument to send the temperature reading

(Err 3 is sent if out of range).
MDR Requests the instrument model name and firmware code.
PAR Requests the setup parameters (instrument ID, calibration alarm

time-out, pH range, beep status).
NSL Requests the number of logged samples.
GLP Requests the calibration data record.
LOD xxx Requests the xxxth record logged data.
LOD ALL Requests all logged data.

Invalid commands will be ignored. The characters sent by the instrumentare
always capital letters. When the instrument receives an unknown or a cor­rupted command, it will send a character CAN (ASCII Code 24).

29

pH VALUES AT DIFFERENT

TEMPERATURES

Temperature has an effect on pH. The calibration buffer solutions are affected
by temperature changes to a lesser degree than normal solutions. During
calibration the instrument will automatically calibrate to the pH value corre­sponding to the measured or set temperature.

PMETSEULAVHp

CºFº86.110.468.610.781.910.0154.21

023 76.110.489.631.764.923.0124.31

514 76.100.459.601.793.942.0112.31

0105 76.100.429.670.733.981.0100.31

5195 76.100.409.640.772.921.0118.21

0286 86.100.488.630.722.960.0136.21

5277 86.110.468.610.781.910.0154.21

0368 86.120.458.600.741.969.992.21

5359 96.130.448.699.601.929.931.21

04401 96.140.448.689.670.989.989.11

54311 07.150.438.689.640.958.948.11

05221 17.160.438.689.610.928.907.11

55131 27.170.448.689.699.897.975.11

06041 27.190.448.689.679.877.954.11

56941 37.111.458.699.659.867.9-

07851 47.121.458.699.639.857.9-

During calibration the instrument will display the buffer value at 25 °C.

30

ELECTRODE CONDITIONING

& MAINTENANCE

PREPARATION

Remove the protective cap.
DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT. This is normal with

electrodes. They will disappear when rinsed with water.
During transport, tiny bubbles of air may form inside the glass bulb affecting

proper functioning of the electrode. These bubbles can be removed by shak­ing down the electrode as you would do with a glass thermometer.

If the bulb and/or junction is dry condition the electrode by soaking it in
HI 70300 or HI 80300storage solution for at least one hour.

31

For Refillable Electrodes:

If the filling solution (electrolyte) is more than 2½ cm (1") below the fill hole,
add HI 7082 or HI 8082 3.5M KCl Electrolyte Solution for double junction or
HI 7071 or HI 8071 3.5M KCl+AgCl Electrolyte Solution for single junction
electrodes using a plastic refilling pipette (HI 740157).

As recommended by the LCD message on instrument on start-up, remove or
loosen the fill hole screw on the electrode for better performance.

STORAGE

To minimize clogging and assure a quick response time, the glass bulb and
the junction should be kept moist and not allowed to dry out.

Replace the solution in the protective cap with a few drops of HI 70300 or
HI 80300 Storage Solution or, in its absence, Filling Solution (HI 7071 or
HI 8071 for single junction or HI 7082 or HI 8082 for double junction

electrodes). Follow the Preparation Procedure on page 31 before taking
measurements.

Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.

PERIODIC MAINTENANCE

Inspect the electrode and the cable. The cable used for connection to the
instrument must be intact and there must be no points of broken insulation on
the cable or cracks on the electrode stem or bulb. Connectors must be perfectly
clean and dry. If any scratches or cracks are present, replace the electrode.
Rinse off any salt deposits with water.

For Refillable Electrodes:

Refill the reference chamber with fresh electrolyte (HI 7071 or HI 8071 for
single junction or HI 7082 or HI 8082 for double junction electrodes) using a
plastic refilling pipette (HI 740157). Allow the electrode to stand upright for
1 hour.

Follow the Storage Procedure above.

CLEANING PROCEDURES

 General Soak in HANNA HI 7061 or HI 8061 General Clean-

ing Solution for approximately 30 minutes.

 Protein Soak in HANNA HI 7073 or HI 8073 Protein Clean-

ing Solution for 15 minutes.

 Inorganic Soak in HANNA HI 7074 Inorganic Cleaning Solu-

tion for 15 minutes.

 Oil/grease Rinse with HANNA HI 7077 or HI 8077 Oil and Fat

Cleaning Solution for approx. 30 seconds.

32

IMPORTANT: After performing any of the cleaning procedures, rinse the

electrode thoroughly with distilled water, refill the reference chamber with
fresh electrolyte (not necessary for gel-filled electrodes) and soak the electrode
in HI 70300 or HI 80300 Storage Solution for at least 1 hour before taking
measurements.

TROUBLESHOOTING GUIDE

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TEMPERATURE CORRELATION

FOR pH SENSITIVE GLASS

The resistance of glass electrodes partially depends on the temperature. The
lower the temperature, the higher the resistance. It takes more time for the
reading to stabilize if the resistance is higher. In addition, the response time
will suffer to a greater degree at temperatures below 25 °C.

34

Since the resistance of the pH electrode is in the range of 50-200 Mohm
depending on the composition of the glass, the current across the membrane
is in the pico Ampere range. Large currents can disturb the calibration of the
electrode for many hours.

For these reasons high humidity environments, short circuits and static dis­charges are detrimental to a stable pH reading.

The pH electrodes life also depends on the temperature. If constantly used at
high temperatures, the electrode life is drastically reduced.

Typical Electrode Life

Ambient Temperature 1- 3 years
90 °C Less than 4 months
120 °C Less than 1 month

Alkaline Error

High concentrations of sodium ions interfere with readings in alkaline solu­tions. The pH at which the interference starts to be significant depends upon
the composition of the glass. This interference is called alkaline error and causes
the pH to be underestimated. Hannas glass formulations have the indicated
characteristics.

Sodium Ion Correction for the Glass at 20-25 °C
Concentration pH Error

0.1 Mol L-1 Na

1.0 Mol L-1 Na

+

+

13.00

13.50

14.00

12.50

13.00

13.50

14.00

0.10

0.14

0.20

0.10

0.18

0.29

0.40

35

ACCESSORIES

pH CALIBRATION SOLUTIONS

HI 70004P pH 4.01 Buffer Sachets, 20 mL, 25 pcs
HI 70007P pH 7.01 Buffer Sachets, 20 mL, 25 pcs
HI 70010P pH 10.01 Buffer Sachets, 20 mL, 25 pcs
HI 7001M pH 1.68 Buffer Solution, 230 mL
HI 7004L pH 4.01 Buffer Solution, 500 mL
HI 7006L pH 6.86 Buffer Solution, 500 mL
HI 7007L pH 7.01 Buffer Solution, 500 mL
HI 7009L pH 9.18 Buffer Solution, 500 mL
HI 7010L pH 10.01 Buffer Solution, 500 mL
HI 7001L pH 1.68 Buffer Solution in FDA approved bottle, 500 mL
HI 8004L pH 4.01 Buffer Solution in FDA approved bottle, 500 mL
HI 8006L pH 6.86 Buffer Solution in FDA approved bottle, 500 mL
HI 8007L pH 7.01 Buffer Solution in FDA approved bottle, 500 mL
HI 8009L pH 9.18 Buffer Solution in FDA approved bottle, 500 mL
HI 8010L pH 10.01 Buffer Solution in FDA approved bottle, 500 mL

ELECTRODE STORAGE SOLUTIONS

HI 70300L Storage Solution, 460 mL
HI 80300L Storage Solution in FDA approved bottle, 460 mL

ELECTRODE CLEANING SOLUTIONS

HI 70000P Electrode Rinse Sachets, 20 mL, 25 pcs
HI 7061L General Cleaning Solution, 460 mL
HI 7073L Protein Cleaning Solution, 460 mL
HI 7074L Inorganic Cleaning Solution, 460 mL
HI 7077L Oil & Fat Cleaning Solution, 460 mL
HI 8061L General Cleaning Solution in FDA approved bottle, 460 mL
HI 8073L Protein Cleaning Solution in FDA approved bottle, 460 mL
HI 8077L Oil & Fat Cleaning Solution in FDA approved bottle, 460 mL

REFILL ELECTROLYTE SOLUTIONS

HI 7071 3.5M KCl + AgCl Electrolyte, 4x30 mL, for single junction electrodes
HI 7072 1M KNO3 Electrolyte, 4x30 mL
HI 7082 3.5M KCl Electrolyte, 4x30 mL, for double junction electrodes
HI 8071 3.5M KCl + AgCl Electrolyte in FDA approved bottle, 4x30 mL,

for single junction electrodes

36

HI 8072 1M KNO3 Electrolyte in FDA approved bottle, 4x30 mL
HI 8082 3.5M KCl Electrolyte in FDA approved bottle, 4x30 mL, for

double junction electrodes

ORP PRETREATMENT SOLUTIONS

HI 7091L Reducing Pretreatment Solution, 460 mL
HI 7092L Oxidizing Pretreatment Solution, 460 mL

pH ELECTRODES

All electrodes with part numbers ending in P are supplied with a BNC
and pin connector and 1 m (3.3') cable, as shown below.

HI 1043P; Use: strong acid/alkali.
Glass-body, double junction, refillable, combination pH electrode.

12 mm

0.5"

HI 1043

"S" VERSION

9.5mm DIA

120 mm

4.7"

0.37"

HI 1053P; Use: emulsions.
Glass-body, triple ceramic, conic shape, refillable, combination pH electrode.

12 mm

0.5"

HI 1053

"S" VERSION

120 mm

4.7"

HI 1131P; Use: general purpose.
Glass-body, single junction, refillable, combination pH electrode.

12 mm

0.5"

HI 1131

"S" VERSION

9.5mm DIA

120 mm

4.7"

0.37"

37

HI1083P; Use: biotechnology, micro titration.
Glass-body, micro, Viscolene, nonrefillable, combination pH electrode

12 mm

HI 1083

0.5"

5 mm

0.2"

120 mm

3 mm

0.12"

"

3.0 mm DIA

0.12"

ORP ELECTRODES

HI 3131P; Use: titration.

Glass-body, refillable, combination platinum ORP electrode

12 mm

0.5"

HI 3131

150 mm

"S" VERSION

5.9"

Consult the Hanna General Catalog for more electrodes with BNC and pin
connectors.

OTHER ACCESSORIES

HI 710005 Voltage adapter from 115 VAC to 12 VDC (USA plug)
HI 710006 Voltage adapter from 230 VAC to 12 VDC (European plug)
HI 710012 Voltage adapter from 240 VAC to 12 VDC (UK plug)
HI 710013 Voltage adapter from 230 VAC to 12 VDC (South African plug)
HI 710014 Voltage adapter from 230 VAC to 12 VDC (Australian plug)
ChecktempC Pocket-size thermometer (range -50.0 to 120.0 ºC)
HI 76405 Electrode holder

HI 8427 pH and ORP electrode simulator with 1 m (3.3') coaxial cable

ending in female BNC connectors

HI 931001 pH and ORP electrode simulator with LCD and 1 m (3.3') coaxial

cable ending in female BNC connectors
HI 7669/2W Temperature probe with 1 m (3.3') cable
HI 740157 Plastic electrode refilling pipet (20 pcs)
HI 92000 Windows® compatible software
HI 920010 9 to 9-pin RS232 cable

Ultem® is registered Trademark of General Electric Co.
Kynar® is registered Trademark of Pennwalt Corp.
Windows® is registered Trademark of Microsoft Co.

38

RECOMMENDATIONS FOR USERS

Before using this product, make sure that it is entirely suitable for the
environment in which it is used.

Operation of this instrument in residential areas could cause unaccept­able interferences to radio and TV equipment, requiring the operator to
take all necessary steps to correct interferences.

The glass bulb at the end of the pH electrode is sensitive to electrostatic
discharges. Avoid touching this glass bulb at all times.

During operation, ESD wrist straps should be worn to avoid possible
damage to the electrode by electrostatic discharges.

Any variation introduced by the user to the supplied equipment may
degrade the instrument's EMC performance.

To avoid electrical shock, do not use this instrument when voltages at the
measurement surface exceed 24 VAC or 60 VDC.

To avoid damage or burns, do not perform any measurement in micro­wave ovens.

Hanna Instruments reserves the right to modify the design, construction
and appearance of its products without advance notice.

39

HANNA SALES AND TECHNICAL SERVICE

Australia:

Tel. [phone]  Fax [phone]

China:

Tel. [phone]  Fax [phone]

Egypt:

Tel. & Fax [phone]

Germany:

Tel. [phone]  Fax [phone]

Greece:

Tel. [phone]  Fax [phone]

Indonesia:

Tel. [phone]  Fax [phone]

Japan:

Tel. [phone]  Fax [phone]

Korea:

Tel. [phone]  Fax [phone]

Malaysia:

Tel. [phone]  Fax [phone]

Norway:

Tel. [phone]  Fax [phone]

Singapore:

Tel. [phone]  Fax [phone]

South Africa:

Tel. [phone]  Fax [phone]

Taiwan:

Tel. [phone]  Fax [phone]

Thailand:

Tel. [phone]  Fax [phone]

United Kingdom:

Tel. [phone]  Fax [phone]

USA:

Tel. [phone]  Fax [phone]

For e-mail contacts and a complete list of Sales and
Technical offices, please see www.hannainst.com.

40

04/04 R0

MAN223