Hanna Instruments HI 110 User manual

1
pH/mV/°C
Bench Meters
with Custom Buffers
HI 110 HI 111
HI 112 HI 113
Instruction Manual
pH
MR
MEM
SET
C
C
RANGE
GLP
CFM
CAL
pH / ORP Meter
HI 113
Select Setup Item
Select pH/ORP
RANGE
SET Set Parameters
GLP Show GLP Data
MEM Store Reading
MR Memory Recall
Functions
Confirm Calibration Point
CFM
Select pH Buffer
/
Enter/Exit Calibration
CAL
pH Calibration
www.hannainst.com

2
WARRANTY
HI 110, HI 111, HI 112 and HI 113 are guaranteed for two years against
defects in workmanship and materials when used for their intended purpose and
maintained according to instructions. Electrodes and probes are guaranteed for
six months. This warranty is limited to repair or replacement free of charge.
Damage due to accidents, misuse, tampering or lack of prescribed maintenance
is 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 packed for complete protection.
Dear Customer,
Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using the instruments.
This manual will provide you with the necessary information for correct use of
the 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 turn to the back cover for our worldwide contact list.
These instruments are in compliance with directives.
TABLE OF CONTENTS
WARRANTY.........................................................................................................................2
PRELIMINARYEXAMINATION..............................................................................................3
GENERALDESCRIPTION..................................................................................................... 3
FUNCTIONAL DESCRIPTION HI 110 AND HI 111 ............................................................. 4
HI 110 ANDHI 111 SPECIFICATIONS..............................................................................5
FUNCTIONAL DESCRIPTION HI 112 AND HI 113 ............................................................. 6
HI 112 ANDHI 113 SPECIFICATIONS..............................................................................7
OPERATIONALGUIDE.........................................................................................................8
pHCALIBRATION................................................................................................................10
GOODLABORATORYPRACTICE(GLP)...................................................................................15
SETUP.....................................................................................................................................17
TEMPERATURE CALIBRATION (for technical personnel only) ........................................... 21
mV CALIBRATION (for technical personnel only, HI 111 AND HI 113) ........................... 23
RELATIVE mV CALIBRATION (HI 111 AND HI 113) ....................................................... 24
PC INTERFACE (HI 112 AND HI 113) ............................................................................ 25
pH BUFFER TEMPERATURE DEPENDENCE ..................................................................... 27
ELECTRODECONDITIONING& MAINTENANCE .................................................................. 28
TROUBLESHOOTINGGUIDE...............................................................................................31
TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS ............................................... 32
ACCESSORIES......................................................................................................................33

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 with:
 HI 1131B 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
 12VDC 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.
The HANNA HI 110, HI 111, HI 112 and HI 113 are microprocessor-based pH
and Temperature bench meters.
HI 111 and HI 113 can also measure Oxidation Reduction Potential (ORP) in
mV range. Relative mV feature is also provided.
pH measurements are compensated for temperature effect manually or
automatically with the HI 7669/2W temperature probe.
Up to three-point (HI 110, HI 111) or up to five-point (HI 112, HI 113)
calibration is possible. In addition, two custom buffers can be set and used
during calibration.
The GLP feature provides a guarantee of data consistency.
An alarm time-out is available to alert the user that too much time elapsed
since the last pH calibration.
Through the RS232 serial port data can be transferred to a PC (HI 112, HI 113).
Hanna Instruments reserves the right to modify the design,
construction and appearance of its products without advance notice.
GENERAL DESCRIPTION

4
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 calibration mode.
4) /ºC key, to manually decrease temperature value or other parameters.
5) /ºC key, to manually increase temperature value or other parameters.
6) MR key, to recall the stored value.
7) MEM key, to store a value into memory.
8) SET key, to enter/exit SETUP mode.
9) RANGE key, to select measurement range or switch to focused data in
SETUP (HI 111 only).
SELkey, to switch to focused data in SETUP menu (HI110 only).
10) ON/OFF switch.
11) Power supply socket.
12) BNC electrode connector.
13) Electrode reference socket.
14) Temperature probe socket.
FUNCTIONAL DESCRIPTION
HI 110 AND HI 111
1
3
2
7
4
6
5
Front Panel
Primary LCD Secondary LCD
POWER
12VDC
INPUT
REF
TEMP
11 12 13 14
Rear Panel
9
10
8
pH
MR
MEM
SET
C
C
RANGE
GLP
CFM
CAL
pH / ORP Meter
HI 111
Select Setup Item
Select pH/ORP
RANGE
SET Set Parameters
GLP Show GLP Data
MEM Store Reading
MR Memory Recall
Functions
Confirm Calibration Point
CFM
Select pH Buffer
/
Enter/Exit Calibration
CAL
pH Calibration

5
HI 110 AND HI 111
SPECIFICATIONS
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6
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 calibration mode.
4) /ºC key, to manually decrease temperature value or other parameters.
5) /ºC key, to manually increase temperature value or other parameters.
6) MR key, to recall the stored value.
7) MEM key, to store a value into memory.
8) SET key, to enter/exit SETUP mode.
9) RANGE key, to select measurement range or switch to focused data in SETUP.
10) ON/OFF switch.
11) Power supply socket.
12) BNC electrode connector.
13) Electrode reference socket.
14) Temperature probe socket.
15) RS232 serial communication connector.
FUNCTIONAL DESCRIPTION
HI 112 AND HI 113
1
9
3
2
7
4
6
5
10
Front Panel
Primary LCD Secondary LCD
RS232
15
POWER
12VDC
INPUT
REF
TEMP
11 12 13 14
Rear Panel
8
pH
MR
MEM
SET
C
C
RANGE
GLP
CFM
CAL
pH / ORP Meter
HI 113
Select Setup Item
Select pH/ORP
RANGE
SET Set Parameters
GLP Show GLP Data
MEM Store Reading
MR Memory Recall
Functions
Confirm Calibration Point
CFM
Select pH Buffer
/
Enter/Exit Calibration
CAL
pH Calibration

7
HI 112 AND HI 113
SPECIFICATIONS
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8
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 main line.
ELECTRODE AND PROBE CONNECTIONS
For pH or ORP measurements connect an electrode with internal reference to
the BNC connector on the back of the instrument.
For electrodes with a separate reference connect the electrodes BNC to the BNC
connector and the reference electrode plug to the reference socket.
For temperature measurements 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 instruments perform a self test.
HI 110 and HI 111
HI 112 and HI 113
pH MEASUREMENTS
Make sure the instrument has been calibrated before
taking pH measurements.
Submerge the electrode tip and the temperature probe
approximately 4 cm (1½) 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.
If the reading is out of range, the closest full-scale value will be displayed
blinking on the primary LCD.
pH
BUFFER pH
INTVDATETIME%
3
2
1
BUF
WRONG
READY
CFM
MEM
pHmVCAL
BUFFER pH
INTVDATETIME%
BUF
WRONG
READY
CFM
MEM
pHmVCAL

9
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, the 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 as possible to the
electrode and wait for a few seconds.
If the temperature of the sample is known, simple manual compensation can
be performed by disconnecting the temperature probe.
The display will then show the default temperature of 25 ºC or
the last temperature reading with the ºC tag blinking.
The temperature can now be adjusted with the ARROW keys
(from 9.9 ºC to 120.0 ºC).
mV/ORP MEASUREMENTS (HI 111 and HI 113)
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.
Press RANGE to enter mV range.
Submerge the tip of the ORP electrode 4 cm (1½) into
the sample to be tested and allow a few seconds for the
reading to stabilize.
The instrument displays the mV reading on the primary LCD and the
temperature on the secondary LCD.
If the reading is out of range, the closest full-scale value will be displayed
blinking on the primary LCD.
C C
mV
mV

10
RELATIVE mV MEASUREMENTS (HI 111 and HI 113)
Press RANGE until rEL message will be displayed on the secondary LCD line
for about one second and mV tag will blink. After one second the
temperature will be displayed on the secondary LCD.
The reading displayed by the instrument is equal to the difference between
the current mV input value and relative mV offset established in the relative
mV calibration.
TEMPERATURE MEASUREMENTS
Connect the HI 7669/2W temperature probe to the appropriate
socket and turn the instrument on.
Immerse the temperature probe into the sample and allow
the reading on the secondary LCD to stabilize.
MEMORY FUNCTION
Press and hold down MEM. The last reading will appear
on the LCD along with MEM tag until MEM is released.
Press MR and the previously memorized reading will be
displayed on the LCD with MEM tag.
pH CALIBRATION
Calibrate the instrument frequently, especially if high accuracy is required.
The instrument should be recalibrated:
Whenever the pH electrode is replaced.
At least once a week.
After testing aggressive chemicals.
If CAL INTV tags are blinking during measurement.
Every time you calibrate the instrument use fresh buffers and perform an
electrode Cleaning Procedure (see page 30).
MR
mV
MEM
pH
MEM

11
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.
If you are measuring in the acidic range, use pH 7.01 or 6.86 as first buffer and
pH 4.01 or 1.68 (HI 112, HI 113) as second buffer. If you are measuring in the
alkaline range, use pH 7.01 or 6.86 as first buffer and pH 10.01, 9.18 or 12.45
(HI 112, HI 113) as second buffer.
PROCEDURE
Calibration can be performed in three (HI 110,HI 111) or five (HI 112,HI 113)
calibration points.
For accurate measurements, it is recommended to perform a three (HI 110, HI
111) or five-point calibration (HI 112, HI 113). However, at least a two-point
calibration is suggested.
The calibration buffer can be selected from the calibration buffer list that
includes the defined custom buffers in SETUP menu and the memorized
standard buffers:
pH 4.01, 6.86, 7.01, 9.18, 10.01 (HI 110, HI 111)
pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45 (HI 112, HI 113)
The custom buffers are a special option that allows the user to calibrate in a
buffer solution different from a standard one. Up to two custom buffers can be
set in SETUP menu (see page 17). Each custom buffer value can be changed
in a ±1.0 pH window around the set value, during calibration, when it is
selected; the BUFFER pH tag will blink.
The instruments will automatically skip the buffer used during calibration and
the buffers which are in a ±0.2 pH window, around one of the calibrated
buffers.
All new calibrations will override existing stored calibration data in a ±0.2
pH window. The slopes adjacent to the new points will be reevaluated.
If the new calibration point has no correspondence in the existing stored
calibration data, it is added to it if this is not full (3 or 5 points), or the
instrument will ask which buffer will be replaced by the current buffer.
If at least a two-point calibration has been performed and an offset correction of
the electrode is wanted, keeping unchanged the existing slopes, perform a one-
point calibration with OFFS option selected in SETUP menu. If Pnt option is
selected, the slopes adjacent to the calibration points will be reevaluated.

12
THREE- (HI 110, HI 111) / FIVE-POINT (HI 112,
HI 113) CALIBRATION
Immerse the pH electrode and the temperature probe
approximately 4 cm (1½) into a buffer solution and
stir gently. The temperature probe should be close to
the pH electrode.
Press CAL. The CAL and 
BUF
 tags will appear
and the 7.01 buffer will be displayed on the
secondary LCD.
If necessary, press the ARROW keys to select a different buffer value.
The   tag will blink on the LCD until the reading is
stable.
When the reading is stable and close to the selected buffer, the
READY tag will be displayed and the CFM tag will blink.
Press CFM to confirm calibration.
The calibrated value will be displayed on the primary LCD
and the second expected buffer value on the secondary
LCD.
After the first calibration point is confirmed, 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.
If necessary, press the ARROW keys to select a different buffer value.
The   tag will blink on the LCD until the reading is
stable.
When the reading is stable and close to the selected buffer, the
READY tag will be displayed and the CFM tag will blink.
Press CFM to confirm calibration.
The calibrated value is then displayed on the primary
LCD and and the third expected buffer value on the
secondary LCD.
After the second calibration point is confirmed, immerse the pH electrode
and the temperature probe approximately 4 cm (1½) into the next
buffer solution and stir gently. The temperature probe should be close to
the pH electrode.
BUFFER pH
2
BUF
pHCAL
BUFFER pH
1
BUF
pHCAL

13
If necessary, press the ARROW keys to select a different buffer value.
The   tag will blink on the LCD until the reading is
stable.
When the reading is stable and close to the selected buffer, the
READY tag will be displayed and the CFM tag will blink.
Press CFM to confirm calibration.
If the fifth calibration point is reached, the instrument stores
the calibration value and returnsto normal measurement
mode, or else it goes to the next calibration point.
TWO-POINT CALIBRATION
Proceed as described in THREE-/FIVE-POINT CALIBRATION section.
Press CAL after the second calibration point was confirmed. The instruments
will memorize the two-point calibration data and will return to measurement
mode.
ONE-POINT CALIBRATION
Two SETUP selectable options are available: Pnt and OFFS.
If the Pnt option is selected, the new calibration point overrides an existing
one. The adjacent slopes will be reevaluated.
If the OFFS option is selected, an electrode offset correction is performed
keeping unchanged the existing slopes.
Proceed as described in THREE-/FIVE-POINT CALIBRATION section.
Press CAL after the first calibration point was confirmed. The instruments will
memorize the one-point calibration data and will return to measurement
mode.
Note: If the value measured by the instrument is not close to the
selected buffer, WRONG   and WRONG   tags will blink
alternately. In this case check if the correct buffer has been used,
or regenerate the electrode by following the Cleaning Procedure
(see page 30). If necessary, change the buffer or the electrode.
When a custom buffer is displayed, the BUFFER pH tag blinks.
To change the custom buffer value in according with the buffer
temperature proceed as described in WORKING WITH CUSTOM
BUFFERS paragraph (see page 14).
If the buffer temperature or the manual temperature exceeds the
temperature limits of the buffer, WRONG tag and temperature
reading will blink.
If WRONG, BUFFER pH tags and OLD message are displayed
blinking on the secondary LCD line, an inconsistency between new and
previous (old) calibration is detected. Clear calibration parameters
and proceed with calibration from the current calibration point. The
instrument will keep all confirmed values during current calibration.

14
To clear calibration parameters for all uncalibrated buffers starting
with current buffer, press and hold down CFM, then press CAL. If
this procedure is performed while calibrating in the first calibration
point, the instrument returns to measurement mode, else calibration
can be continued from the current point.
Press RANGE (SEL for HI 110)to toggle
between pH buffer and temperature reading
(HI 110, HI 111).
Press RANGE to toggle between pH buffer,
buffer number and temperature reading
during calibration (HI 112, HI 113 only).
Each time a buffer is confirmed, the new calibration parameters
replace the old calibration parameters of the coresponding buffer. If
current confirmed buffer has no correspondence in the existing stored
calibration and this is not full, (three buffers for HI 110, HI 111; five
buffers for HI 112, HI 113), the current buffer is added to the
existing stored calibration. If the existing stored calibration is full, the
instrument asks which buffer will be replaced by current buffer.
Press the ARROW keys to select another buffer to be replaced.
Press CFM to confirm the buffer that will be replaced.
Press CAL to leave calibration without replacing.
Note: If the replaced buffer is outside the ±0.2 pH window, around each of
the calibrated buffers, it is possible to select this buffer for next calibra-
tion during current calibration.
WORKING WITH CUSTOM BUFFERS
If at least one custom buffer was set in SETUP menu, it can be selected for
calibration by pressing the ARROW keys. The BUFFER pH tag will blink.
Press SET if you want to adjust the buffer value. The buffer value will start
blinking.
Use the ARROW keys to change the buffer value.
After about 5 seconds since you performed the last change, the buffer value is
updated. Press SET if you want to change it again.
Note: Custom buffer value can be adjusted in a ±1.00 pH window, around
the set value.
CFM
CAL
BUFFER pH
pH
BUF
CAL
BUFFER pH
pH

15
GOOD LABORATORY PRACTICE (GLP)
GLP is a set of functions that allows storage and retrieval of data regarding the
maintenance and status of the electrode.
All data regarding the last calibration (one, two, three, four or five-point) is
stored for the user to review when necessary. This data includes the following:
calibration time stamp, offset (mV), average of slope (%), calibration buffers
and the time until a new calibration is required.
CALIBRATION ALARM TIME-OUT
These instruments allow the user to set the number of days before the next
required calibration. This value can be set from 1 to 7 days. The default
setting is OFF (disabled).
The instruments check if the time-out time has expired. If the time elapsed, the
CAL INTV tags will blink as a reminder.
Note: If the instruments were not calibrated, the CAL INTV tags will be
displayed even if the feature is disabled in SETUP menu.
LAST CALIBRATION DATA
Last calibration data are stored automatically after a successful calibration.
To view the pH calibration data, press GLP while in measurement mode.
The instruments will display the time (hh:mm) of the last calibration.
Press the ARROW keys to view the next logged calibration parameter
(pressing the ºC key):
The date (yyyy.mm.dd).
The pH calibration offset.
The pH calibration slope (the GLP slope is the average of the calibration
slopes; the percentage is referred to the ideal value of 59.16 mV/pH).
DATE
CAL
mVCAL
%
CAL

16
The pH calibration buffers in calibrating order.
The first pH calibration buffer:
The second pH calibration buffer:
The third pH calibration buffer:
Note: For HI 112 and HI 113, the fourth and the fifth calibration
buffers are also displayed in GLP.
The OLd message displayed beside the pH value means that
this buffer was not used during last calibration. Press and hold
down SET if you want to see calibration date (or time, if old
calibration was made in the same day with current calibration).
For each custom buffer used in calibration, the BUFFER pH tag
will blink.
If no bUF message appears on the LCD, the instrument informs
you that calibration was performed in less than three (HI 110, HI
111) or five points (HI 112, HI 113).
pH resolution during calibration.
Calibration Alarm Time-Out status:
if disabled.
BUF
CAL
BUFFER pH
BUF
pHCAL
BUFFER pH
BUF
pHCAL
BUF
pHCAL
BUFFER pH
CAL

17
Setup mode allows viewing and modifying the following parameters:
Calibration Alarm Time-Out
Custom buffer 1
Custom buffer 2
One-point calibration behaviour
Instrument ID (HI 112 & HI 113)
Current Time
Current Date
Beep Status
Baud Rate (serial communication, HI 112 & HI 113)
Command prefix (serial communication, HI 112 & HI 113)
To enter SETUP mode press SET while the instrument is in measurement mode.
Select a parameter with the ARROW keys.
Press CAL if you want to change a parameter value. The selected parameter
will start blinking.
Press RANGE (SEL for HI 110) to toggle between displayed parameters.
Press the ARROW keys to increase or decrease the displayed value.
Press CFM to save the modified value or CAL to escape.
Press the ARROW keys to select the next/previous parameter.
INTV
CAL
CAL
or the number of days until the calibration alarm will be displayed.
or if expired (7 days ago).
The instrument ID.
Note: Press GLP at any moment and the instruments will return to
measurement mode.
If calibration has not been performed, the instruments display
no CAL message blinking.
SETUP

18
CALIBRATION ALARM TIME-OUT SET
Press CAL when the calibration time-out is displayed. Calibration time-out
(OFF or 1 to 7 days) will start blinking.
Press the ARROW keys to change the calibration time-out value.
Press CFM to save the modified calibration time-out value.
Press CAL to escape without saving.
FIRST CUSTOM BUFFER SET
Press CAL when custom buffer 1 is displayed. The custom buffer (disabled  no
cb1or 0 to 16 pH) will start blinking.
Press the ARROW keys to change the custom buffer value.
Press CFM to save the modified custom buffer value.
Press CAL to escape without saving.
SECOND CUSTOM BUFFER SET
Press CAL when custom buffer 2is displayed. The custom buffer (disabled  no
cb2or 0 to 16 pH) will start blinking.
Press the ARROW keys to change the custom buffer value.
Press CFM to save the modified custom buffer value.
Press CAL to escape without saving.
ONE-POINT CALIBRATION BEHAVIOUR
Press CAL when 1 Pnt message is displayed on the secondary LCD. One of
the two options (Pnt or OFFS) will start blinking (see pH CALIBRATION
PROCEDURE for details, page 11).
Press the ARROW keys to toggle between Pnt and OFFS options.
Press CFM to save the behaviour for one-point calibration.
Press CAL to escape without saving.
CAL
BUFFER pH
CAL
BUFFER pH
INTV
CAL
CAL

19
INSTRUMENT ID PARAMETER SET
(HI 112, HI 113 only)
Press CAL when the instrument ID is displayed. The instrument ID (0000 to
9999) will start blinking.
Press the ARROW keys to change the instrument ID value.
Press CFM to save the modified instrument ID value.
Press CAL to escape without saving.
CURRENT TIME SET
Press CAL when the current time is displayed. The hour will start blinking.
Press the ARROW keys to change the hour.
Press RANGE (SEL for HI 110). The minutes will start blinking.
Press the ARROW keys to change the minutes.
Press CFM to save the modified value.
Press CAL to escape without saving.
CURRENT DATE SET
Press CAL when the current date is displayed. The year will start blinking.
Press the ARROW keys to change the year.
Press RANGE. The month will start blinking.
Press the ARROW keys to change the month.
TIME
TIME
DATE
DATE

20
Press RANGE. The day will start blinking.
Press the ARROW keys to change the day.
Press CFM to save the modified value.
Press CAL to escape without saving.
BEEP STATUS SET
Press CAL when the beep status is displayed. Beep status (On or OFF) will
start blinking.
Press the ARROW keys to change the beep status (On or OFF).
Press CFM to save the modified beep status.
Press CAL to escape without saving.
BAUD RATE SET (HI 112, HI 113 only)
Press CAL when the baud rate is displayed. The baud rate (600, 1200, 2400,
4800 or 9600) will start blinking.
Press the ARROW keys to change the baud rate value.
Press CFM to save the modified baud rate value.
Press CAL to escape without saving.
SERIAL COMMUNICATION COMMAND PREFIX SET
(HI 112, HI 113 only)
Press CAL when the command prefix is displayed. The command prefix (0 to
47) will start blinking.
Press the ARROW keys to change the command prefix.
Press CFM to save the modified command prefix value.
Press CAL to escape without saving.
Note:  See the PC interface section on page 25 for a complete explanation.
 The command prefix must be 16 if HI 92000 PC software is used.
DATE