Hanna Instruments HI 931400 User manual

Instruction Manual
HI 9321
HI 931400
HI 931401
Microprocessor-based
Bench pH/mV/°C Meters
www.hannainst.com These Instruments are in
Compliance with the CE Directives
OFF
°C
ON
MR
°C
MEM
RANGE
CFM
COMM
CAL
HI 931401
MICROPROCESSOR
pHMETER
CFM Confirm when ready
/Select buffer 2 value
CFM Confirm when ready
/Select buffer 1 value
CAL Start calibration
pHcalibrationprocedure
RANGE Select pH or ORP measurement
COMMFor RS232 configuration
MRRecall previous stored data
MEM For storing display result
Function
°C
pH
ins
rum ns

2
Dear Customer,
Thank you for choosing a Hanna Product. It is recommended that you
read this instruction manual carefully before using the instrument.
This manual will provide you with the necessary information for the
correct use of the instrument, as well as a precise idea of its versatility.
If you need more technical information, do not hesitate to e-mail us
at [email protected].
This instrument is in compliance with the CSA, UL and
Directives.
TABLE OF CONTENTS
PRELIMINARY EXAM. & GENERAL DESCRIPTION ............................. 3
FUNCTIONAL DESCRIPTION .......................................................... 4
SPECIFICATIONS........................................................................... 6
FUNCTIONAL DESCRIPTION OF LCD .............................................. 8
OPERATIONAL GUIDE ................................................................... 9
pH CALIBRATION ....................................................................... 12
pH VALUES AT VARIOUS TEMPERATURES................................... 16
TAKING REDOX MEASUREMENTS................................................. 16
TEMPERATURE AND mV CALIBRATION ......................................... 17
INTERFACE WITH PC ................................................................... 17
TROUBLESHOOTING GUIDE ........................................................ 18
ELECTRODE CONDITIONING & MAINTENANCE............................... 19
TEMPERATURE CORRELATION FOR pH......................................... 22
ADDITIONAL CALIBRATION PROCEDURES AND INFORMATION ...... 24
ACCESSORIES ............................................................................. 27
WARRANTY ................................................................................ 34
CE DECLARATION OF CONFORMITY.............................................. 35

3
PRELIMINARY EXAMINATION
The Hanna Instruments HI 9321, HI 931400 and HI 931401 are
microprocessor-based bench meters for pH, mV (ORP and ISE) and
temperature measurements.
pH measurements are compensated for the temperature effect manu-
ally or automatically with the HI 7669/2W temperature probe.
The meter comes equipped with a large LCD which shows the pH (or
mV) and temperature simultaneously together with graphic symbols.
Through the RS 232C serial port you can transfer sample measure-
ments to a PC (HI 931400 and HI 931401).
GENERAL DESCRIPTION
Remove the instrument from the packing material and examine it 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 meter comes supplied complete with:
•HI 1131B glass-body combination pH Electrode with 1 m
(3.3') cable
•HI 7669/2W Temperature Probe
•HI 76405 Electrode Holder
• pH 4.01 & 7.01 Buffer Solutions (20mL each)
•HI 7071 Electrolyte Solution
• 12VDC Transformer (HI 710005 or HI 710006)
• Dust cover
Note: Save all packing material until you are sure that the
instrument functions correctly. Any defective items must be
returned in the original packing with the supplied accessories.

4
FUNCTIONAL DESCRIPTION HI 9321
MR
°C
MEM
ON/OFF °C
RANGE CFM
CAL
CFM Confirm when ready
/Select buffer 2 value
CFM Confirm when ready
/Select buffer 1 value
CAL Start calibration
pH calibration procedure
Select pH or ORP measurement
MR Recall previous stored data
MEM For storing display result
RANGE
Function
HI 9321
MICROPROCESSOR
pH METER
ins rum n s
1
23 4 56 7 8
°C1
2
pH
pH
mV
CAL
MEM
NOT READY
CON WRONG
BUF
I. BNC Socket
II. Reference Electrode Socket
III. Reference Electrode Socket
IV. Temperature Probe Socket
V. Reset Button
VI. VDC Power Socket (for HI 710005 or HI 710006)
1. Liquid Crystal Display
2. CAL enters and exits calibration mode
3. CFM confirms calibration values
4. ↑↑
↑↑
↑°C and ↓↓
↓↓
↓°C manually set temperature and select pH
buffer values
5. MR recalls the stored value
6. MEM stores a value in memory
7. RANGE selects measurement range
8. ON/OFF turns meter on and off

5
I. BNC Socket
II. Reference Electrode Socket
III. Reference Electrode Socket
IV. Temperature Probe Socket
V. Reset Button
VI. VDC Power Socket (for HI 710005 or HI 710006)
VII. RS 232C Socket
OFF
°C
ON
MR
°CMEM
RANGE CFM
COMM
CAL
HI 931401
MICROPROCESSOR
pH METER
CFM Confirm when ready
/ Select buffer 2 value
CFM Confirm when ready
/Select buffer 1 value
CAL Start calibration
pH calibration procedure
RANGE Select pH or ORP measurement
COMM For RS232 configuration
MR Recall previous stored data
MEM For storing display result
Function
ins rum n s
1
2345 678
9
10
°C1
2
pH
pH
mV
CAL
MEM
NOT READY
CFM WRONG
BUF
FUNCTIONAL DESCRIPTION
HI 931400 & HI 931401
1. Liquid Crystal Display
2. MEM stores a value in memory
3. MR recalls the stored value
4. CAL enters or exits calibration mode
5. CFM confirms calibration values
6. RANGE selects measurement range
7. COMM sets baud rate
8. ↑↑
↑↑
↑°C and ↓↓
↓↓
↓°C manually set temperature and select pH
buffer values
9. ON turns meter on
10. OFF turns meter off

6
SPECIFICATIONS HI 9321
& HI 931400
Range pH 0.00 to 14.00
ISE ±399.9 mV
ORP ±1999 mV
°C 0.0 to 100.0
Resolution pH 0.01
ISE 0.1 mV
ORP 1 mV
°C 0.1
Accuracy pH ±0.01
(@20°C/68°F) ISE ±0.2 mV
ORP ±1mV
°C ±0.5
Typical EMC pH ±0.02
Deviation ISE ±0.5 mV
ORP ±1 mV
°C ±2
pH Calibration Automatic 1 or 2 points with 5 memorized buffers
(4.01, 6.86, 7.01, 9.18, 10.01)
Temperature Automatic or manual
Compensation from 0 to 100°C (32 to 212°F)
Electrode HI 1131B glass-body combination
refillable pH electrode (included)
Temperature probe HI 7669/2W (included)
Input impedance 1012 Ω
Computer Interface opto-isolated RS 232C (HI 931400 only)
Power supply 12 VDC (CSA, UL & CE approved) (included)
Environment 0 to 50°C (32 to 122°F)
max. 95% RH non-condensing
Dimensions 230x170x70 mm (9.1x6.7x2.7")
Weight 1.3 kg (2.9 lb.); kit with holder: 3.2 kg (7 lb.)

7
SPECIFICATIONS HI 931401
Range pH 0.00 to 14.00 / 0.000 to 14.000
mV ±999.9 (ISE & ORP)
°C 0.0 to 100.0
Resolution pH 0.01 / 0.001
mV 0.1
°C 0.1
Accuracy pH ±0.002 & ±0.01
(@20°C/68°F) mV ±0.05% F.S.
°C ±0.5
Typical EMC pH ±0.01
Deviation mV ±0.6
°C ±0.5
pH Calibration Automatic 1 or 2 points with 5 memorized buffers
(4.01, 6.86, 7.01, 9.18, 10.01)
Temperature From 0 to 100°C (32 to 212°F) manual or
Compensation automatic with HI 7669/2W probe (included)
Electrode HI 1131B glass-body combination
refillable pH electrode (included)
Temperature probe HI 7669/2W (included)
Input impedance 1012 Ω
Computer Interface Opto-isolated RS 232C (included)
Power supply 12 VDC (CSA, UL & CE approved) (included)
Environment 0 to 50°C (32 to 122°F)
max. 95% RH non-condensing
Dimensions 230x170x70 mm (9.1x6.7x2.7")
Weight 1.3 kg (2.9 lb.); kit with holder: 3.2 kg (7 lb.)

8
FUNCTIONAL DESCRIPTION OF
HI 931401 LCD
Primary Display
Secondary Display
°C1
2
pH
pH
mV
CAL
MEM
NOT READY
CON WRONG
LOW BAT BUF
FUNCTIONAL DESCRIPTION OF
HI 9231 & HI 931400 LCD

9
OPERATIONAL GUIDE
ELECTRODE AND PROBE CONNECTIONS
For combination pH or ORP electrodes (with internal reference) plug
the electrode's BNC to the socket on the back of the meter (pages 4-
5, # I).
For electrodes with a separate reference, connect the measuring
electrode's BNC to the BNC socket (pages 4-5, # I) and the reference
electrode plug to the other socket (pages 4-5, # II or III).
For temperature measurements and automatic temperature compen-
sation connect the temperature probe to the appropriate socket
(pages 4-5, # IV).
POWER CONNECTION
Plug the 12VDC transformer (HI 710005 or HI 710006) into the DC
socket (pages 4-5, # VI). Plug the transformer to the mains.
Note: Make sure the main line is protected by a fuse.
HI 931400 and HI 931401 use an EEPROM to retain the pH, mV
and temperature calibrations as well as the serial communication
setting. The instrument will retain the data after a calibration or
serial communication setting, even when it is unplugged.
pH MEASUREMENTS
To take a pH measurement simply submerge
the tip (4cm/1½") of the electrode and the
temperature probe into the sample to be
tested.
Turn the instrument on.
The meter automatically defaults to the pH
measurement mode.
Allow a couple of minutes for the electrode to
stabilize.
pH is displayed on the primary display and
temperature on the secondary one.
ON
4 cm
(1½")
pH
°C

10
In order to take accurate pH measurements, make sure that the
instrument has been calibrated before use (see page 12).
For more accurate results, it is recommended that the electrode is
rinsed thoroughly with a liberal amount of the sample to be
measured.
The pH reading is directly affected by temperature. In order for the
meter to measure the pH accurately, temperature must be taken into
consideration. A perfect equilibrium between the pH electrode and the
sample can take up to 15 minutes.
To use the Automatic Temperature Compensation feature, sub-
merge the HI 7669/2W temperature probe into the sample as close
to the electrode as possible and wait for a couple of minutes.
If the temperature of the sample is known or tests are always
performed at the same temperature you can simply manually
compensate for it. For this purpose the temperature probe must be
disconnected.
The display will then show the default tem-
perature of 25°C or the last recorded
temperature reading with the "°C" symbol
blinking.
Note the temperature of the sample using a
ChecktempC or an accurate reference ther-
mometer.
The temperature can now be adjusted with
the ↑↑
↑↑
↑°C and ↓↓
↓↓
↓°C keys.
If the temperature probe is connected to the
meter, the secondary LCD will display the
measured temperature and the "°C" indicator
will not blink. In this case, pressing ↑↑
↑↑
↑°C or
↓↓
↓↓
↓°C will not alter the temperature reading.
If measurements are taken in different samples successively, it is
recommended that the electrode (and the temperature probe) be
rinsed thoroughly with deionized, distilled or in the absence of both,
tap water and then blot dry between each measurement.
°C
°C
pH
°C
°C
°C

11
ORP MEASUREMENTS
Press RANGE.
Submerge the ORP or ISE electrode tip (4cm/
1½") into the sample.
Allow a few minutes for the reading to stabi-
lize.
If readings are out of range "---" will appear
on the LCD.
See also "Taking REDOX Measurements" on page 16.
TEMPERATURE MEASUREMENTS
Taking a temperature measurement is very
easy. Connect the HI 7669/2W temperature
probe and turn the instrument ON.
Dip the liquid/general purpose HI 7669/2W
probe into the sample and allow the reading
on the secondary display to stabilize.
HOLD FUNCTION
Press and hold MEM. The last reading will be frozen on the display
until MEM is released. During this operation, the MEM indicator is
also shown on the LCD.
Press MR and the previously memorized reading will be displayed
with the MEM indicator on the LCD.
4 cm
(1½")
mV
ºC
mV
°C
MEM
pH
°C
MEM
pH
°C

12
RESET BUTTON
The RESET button (see pages 4-5, #V) should be used when the
instrument displays erroneous messages due to strong electrical inter-
ference or when the instrument's power supply was disconnected
before the meter was switched off.
It is recommended to recalibrate the unit before proceeding.
pH CALIBRATION
Calibrate the instrument often, especially if high accuracy is required.
The instrument should be re-calibrated for pH:
a) Whenever the pH electrode is replaced.
b) At least once a week.
c) After testing aggressive chemicals.
d) If higher accuracy is required.
e) After pressing RESET.
PREPARATION
Pour small quantities of the buffer solutions into clean beakers.
For accurate calibration and to minimize cross contamination use two
beakers for each buffer solution. One for rinsing the electrode and a
second for calibration.
To obtain accurate readings, use pH 7.01 and pH 4.01 if you are
going to measure acidic samples or pH 7.01 and pH 10.01 for
alkaline measurements.
HI 7007
HI7004
HI 7004
HI 7007
CALIBRATION
HI 7007
RINSE

13
PROCEDURE
Calibration has a choice of 5 memorized buffers: 4.01, 6.86, 7.01,
9.18 and 10.01 pH.
It is always recommended to perform a two-point calibration, first in
an offset buffer (pH 6.86 or pH 7.01) and then a slope value
(pH 4.01, pH 9.18 or pH 10.01). The pH meter however also
provides for one-point calibration, as described below.
One-point calibration
•Immerse the pH electrode approximately
4 cm (1½") into a buffer solution of your
choice (pH 4.01, 6.86, 7.01, 9.18 or 10.01)
and stir gently. Attach the HI 7669/2W
temperature probe and immerse it too in
the buffer solution close to the pH electrode.
• Press CAL. The "CAL" and "
BUF
1
" indicators and "7.01" will be
displayed.
• Press ↑↑
↑↑
↑°C or ↓↓
↓↓
↓°C until the secondary display shows the same
value as the buffer solution.
• If the pH electrode has not completely
adjusted to the buffer value the LCD will
blink "NOT READY".
Only when the reading is stable, "READY"
and "CON" ("CFM" on HI 931401) will
blink.
• Press CFM to confirm the calibration.
If the value measured by the meter is not
close to the selected buffer, "WRONG
BUF
1
"
and "WRONG " will blink alternately (check
the buffers to ensure the correct one has
been used. If necessary change the buffer
or even the electrode). If the reading is
4 cm
(1½")
CAL
1
BUF pH
NOT READY
READY
CON
WRONG
WRONG
1
BUF

14
close to the selected buffer, the meter
stores the reading. The buffer value is
then displayed on the primary LCD and
the secondary LCD will display "4.01".
• Press CAL and the meter exits the calibra-
tion mode.
Two-point calibration
Any two of the 5 memorized buffer solutions that are more than 1 pH
apart can be used for this purpose. However, it is recommended that
pH 6.86 or 7.01 is chosen as the offset point and pH 4.01 (acidic) or
pH 9.18/10.01 (alkaline) for the second (slope) calibration.
• Proceed as described in “One-point calibration” above but do not
quit calibration by pressing CAL at the end.
•After the first calibration point is con-
firmed, immerse the pH electrode
approximately 4 cm (1½") into the second
buffer solution and stir gentlly. Attach the
HI 7669/2W temperature probe and im-
merse it too in the buffer solution close to
the pH electrode.
•Select the second buffer value on the secondary display by
pressing ↑↑
↑↑
↑°C or ↓↓
↓↓
↓°C.
• When the “READY” and “CON” ("CFM" on
HI 931401) symbols blink on the display
the reading is stable and the calibration
can be confirmed.
• Press CFM.
If the value measured by the meter is not
close to the selected buffer solution, “WRONG
BU
F
2” and “WRONG ” will blink alter-
nately (check the buffers to ensure the
correct one has been used. If necessary
change the buffer or even the electrode). If the reading is close to
the selected buffer, the slope and the offset are calibrated. The
values will be stored in memory and the meter will return to the
operating mode.
CAL
1
BUF
pH
4 cm
(1½")
READY
CON
WRONG
WRONG
2
BUF

15
Note: The meter will automatically skip the buffer that was used for
the first calibration. pH 6.86 and pH 7.01 as well as 9.18
and 10.01 pairs of buffer solutions are also considered too close
to allow an adequate two-point calibration. Consequently,
after calibrating in one of the pair, the meter will also skip the
other buffer.
Note: During calibration, the secondary LCD displays the selected
buffer value.
Press RANGE and the temperature of
the buffer will be displayed during cali-
bration.

16
pH VALUES AT VARIOUS
TEMPERATURES
TEMP pHVALUES
°C °F 4.01 6.86 7.01 9.18 10.01
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
32
41
50
59
68
77
86
95
104
113
122
131
140
149
158
4.01
4.00
4.00
4.00
4.00
4.01
4.02
4.03
4.04
4.05
4.06
4.07
4.09
4.11
4.12
6.98
6.95
6.92
6.90
6.88
6.86
6.85
6.84
6.84
6.83
6.83
6.84
6.84
6.85
6.85
7.13
7.10
7.07
7.04
7.03
7.01
7.00
6.99
6.98
6.98
6.98
6.98
6.98
6.99
6.99
9.46
9.39
9.33
9.27
9.22
9.18
9.14
9.10
9.07
9.04
9.01
8.99
8.97
8.95
8.93
10.32
10.24
10.18
10.12
10.06
10.01
9.96
9.92
9.88
9.85
9.82
9.79
9.77
9.76
9.75
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 meter will automatically calibrate to
the pH value corresponding to the measured or set temperature.
For instance, if the buffer temperature is 25°C, the display will show
pH 4.01 or 7.01 or 10.01. If the buffer temperature is 20°C, it will
show pH 4.00/7.03/10.06 or at 50°C, the display will show
pH 4.06/6.98/9.82.
TAKING REDOX MEASUREMENTS
An optional ORP electrode must be used to perform ORP measure-
ments (see page 33).
Oxidation-reduction potential (REDOX) measurements provide the
quantification of the oxidizing or reducing power of the sample tested.
To correctly perform a redox measurement, the surface of the ORP
electrode must be clean and smooth.
When not in use, the tip of the electrode should be kept moist and
safe from any mechanical stress which might cause damage to the
glass/platinum sensing element.

17
TEMPERATURE AND mV CALIBRATION
The pH meter has been factory calibrated for temperature and mV.
The temperature probes and ORP electrodes are interchangeable and
no temperature or mV calibration is needed when they are replaced.
If, for any reason, the temperature or the mV measurements are
inaccurate, temperature or mV recalibration should be carried out
(see pages 24 and 25).
For an accurate recalibration, contact your dealer or the nearest
Hanna Customer Service Center.
Windows®and Windows Terminal®are registered Trademark of "Microsoft Co."
Excel©Copyright of "Microsoft Co."
Lotus 1-2-3©Copyright of "Lotus Co."
Data transmission from the instrument to the PC is now much easier
with the new HI 92000 Windows®compatible application software
(optional). HI 92000 also offers an on-line help feature.
Simply run your desired spread sheet and open the file downloaded
by HI 92000. Data can be further elaborated with graphics, statis-
tical analysis, etc. using the most diffused spread sheet programs
(e.g. Excel©, Lotus 1-2-3©).
To install HI 92000 you need a 3.5" drive and a few minutes to
follow the instructions printed on the disk label.
In your copy of HI 92000 you will also find a set of configuration files
for your Windows Terminal®program to send commands directly from
the PC keyboard (see appendix for commands description and usage).
To connect your meter to the PC use the optional HI 920010
(available from your Hanna Dealer). Make sure that your meter is
switched off and plug the connectors, one into the meter RS232C
socket, the other into the serial port of your PC.
Note: Cables other than HI 920010 may use a different configura-
tion, in which case, communication between the meter and
the PC may not be possible.
INTERFACE WITH PC

18
TROUBLESHOOTING GUIDE
Symptoms Problem Solution
The meter is slow in
responding or gives
faulty readings
The meter does not
accept the 2nd buffer
solution for calibration
The reading drifts
Display shows:
Display shows:
Display shows:
Display shows:
"WRONG
BU
F
1 "
and
"WRONG "
Display shows:
"WRONG BU
F
2
"
and
"WRONG "
The meter does not
work with the tem-
perature probe
The meter fails to cali-
brate or gives faulty
readings
The electrode is not
working or the reference
junction is clogged
Out of order pH elec-
trode
Defective pH electrode
Out of range pH scale
Out of range tempera-
ture scale
Out of range mV scale
Erroneous buffer solution
used for offset calibra-
tion
Defective electrode
Erroneous buffer solution
used for slope calibra-
tion
Defective electrode
Out of order temperature
probe
Out of order pH elec-
trode
Leave the electrode in a stor-
age solution after cleaning
the junction. If problem per-
sists, replace the electrode
Follow the cleaning proce-
dure. If this doesn't work
replace the electrode
Replace the electrode
a) Recalibrate
b) Make sure the pH
sample is in the 0 to 14
range
c) Check the electrolyte level
and the general state of
the pH electrode
Make sure the temperature
is in the 0 to 100°C range
and the temperature probe
is plugged in
Electrode not connected
Make sure the buffer setting
is correct and the solution is
fresh. Replace the buffer if
necessary
Replace the electrode
Make sure the buffer setting
is correct and the solution is
fresh. Replace the buffer if
necessary
Replace the electrode
Replace the probe
Replace the electrode

19
ELECTRODE CONDITIONING
& MAINTENANCE
PREPARATION
Remove the protective cap.
DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT.
This is normal with electrodes and 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, soak the electrode in HI 70300 or
HI 80300 Storage Solution for at least one hour.

20
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.
For a faster response, unscrew the fill hole screw during measure-
ments.
For AmpHel® electrodes:
If the electrode does not respond to pH changes, the battery is run
down and the electrode should be replaced.
MEASUREMENT
Rinse the electrode tip with distilled water. Immerse the tip (bottom
4 cm /1½") in the sample and stir gently for a few seconds.
For a faster response and to avoid cross contamination of the samples,
rinse the electrode tip with a few drops of the solution to be tested,
before taking measurements.
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 above 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 meter 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). Allow the electrode to stand upright for 1 hour.
Follow the Storage Procedure above.
AmpHel®is a registered Trademark of "Hanna Instruments"