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