Instruction Manual
HI9624 - HI 9625
HI 96240 - HI 96250
Portable Waterproof
GLP
pH/°C Meters
with Calibration Data Storage
This instrument is in Compliance with the CE Directives
HTTP://
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 all the
necessary information for the correct use of
the instrument, as well as a precise idea of its
versatility in a wide range of applications.
These instruments are in compliance with the
directives.
TABLE OF CONTENTS
General Description ..................................... 3
Preliminary Examination ............................. 3
LCD Display Functional Description ............ 5
Functional Description HI 9624 & HI96240 ... 6
Specifications HI 9624 & HI 96240 ............... 7
Functional Description HI 9625 & HI 96250... 8
Specifications HI 9625 & HI 96250 ............... 9
Operational Guide ..................................... 10
pH Calibration ........................................... 21
pH Values at Various Temperature ............. 27
Temperature and mV Calibration ................ 28
RS232C Output (HI96240 & HI96250) ....... 29
Electrode Conditioning and Maintenance ... 32
Battery Replacement ................................ 36
Troubleshooting Guide ............................... 38
Temperature-Resistance Correlation for
HANNA pH Sensitive Glass....................... 39
Accessories .............................................. 41
Electrode Application Reference Guide ..... 49
Warranty ................................................... 50
CE Declaration of Conformity .................... 51
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 noticeable damage is found, notify
your Dealer.
Each pH meter is supplied complete with:
• HI1230B Combination pH Electrode
• HI7669/2W Temperature Probe
• 1.5V AA size Alkaline Batteries (4 pcs)
• pH4, pH7 buffer and cleaning solutions
(20 mL each)
• 12VDC power adapter
• Rugged Carrying Case.
The kit versions HI96240 and HI96250 include
also:
• HI92000 Windows
®
compatible software
• HI920011 PC connection cable
• HI3230B platinum, gel, plastic body
ORP electrode (HI96250KIT only)
Note: Save all packing material until you are
sure that the instrument functions correctly. All defective items must be returned in the original packaging together
with the supplied accessories.
GENERAL DESCRIPTION
Microprocessor-based, HI9624, HI9625,
HI96240 and HI96250 are portable waterproof
pH/°C meters which meet
GLP GLP
GLP
(Good Labo-
GLP GLP
ratory Practice) requirements.
The last calibration data is automatically stored
in memory and you can check the date and
time of the last performed calibration, including the offset and 2 slope values, at any time
by simply pressing one button. The possibility of checking the status of your meter guarantees maximum measurement precision.
3
With HI9625 and HI96250 you can also measure ORP (Oxidation Reduction Potential) or
Ion Specific (ISE). mV measurements automatically switch from 0.1 to 1 mV resolution
when the reading reaches 400 mV.
All pH measurements are automatically compensated for temperature changes (ATC) when
used with the supplied temperature probe.
It is possible to connect the HI96240 and
HI96250 to a PC through the RS232C serial
port for monitoring data via computer.
Other features include:
• automatic pH calibration (1, 2 or 3 points)
• 5 memorized pH buffers: pH 4.01
6.86
7.01
9.18
10.01
• dual level display with graphic symbols,
including defective electrode indication
• 24 hr clock with date and time.
• 12VDC socket for external power supply
• low battery detection.
Made of tough, lightweight ABS material, the
water-resistant rugged casing are built to last.
These heavy-duty pH meters comply with the
IP67 standards: dust-tight, they are protected
against the effects of temporary immersion in
water and are designed to provide laboratory
results and accuracy under harsh industrial
conditions.
4
LCD DISPLAY FUNCTIONAL DESCRIPTION
mV pH DATE
1
CFM
WRONG
CAL
BUF
1. Primary Display
2. Secondary Display
1
2
3
°C mV pH
2
5
FUNCTIONAL DESCRIPTION OF
HI 9624 & HI 96240
11
2
pH
°C
HI 9624
MICROCOMPUTER
pH METER
CAL CFMCFM
33
2
55
66
77
88
HI 96240
MICROCOMPUTER
pH METER
ON / OFFON / OFF
ALTALT
CAL
RANGERANGE TIMETIME CAL DATACAL DATA
pH
°C
4
1212
1111
1010
99
1. BNC socket for pH Electrode
2. RCA Socket for Temperature Probe
3. Socket for External Power Supply
4. Socket for RS232C connection cable (for
HI 96240 only)
5. Liquid Crystal Display
6. ON/OFF key, to turn the meter on or off
7. ALT, alternate function key
8. RANGE key, to select pH measurement
mode
9. CAL DATA key, to display last calibration data: date and time, offset and 2
slope values
10. TIME key, to display date and time
11. CFMÐ key, to confirm the calibration reading and DOWN arrow key to scroll down
12. CALÏ key, to enter or exit calibration
mode and UP arrow key to scroll up
6
SPECIFICATIONS OF HI 9624 & HI 96240
HI 9624 HI 96240
Range pH 0.00 to 14.00
Resolution pH 0.01
Accuracy pH +0.01
(@20°C/68°F) °C +0.5
Typical EMC pH +0.01
Deviation °C +0.5
Calibration Automatic 1, 2 or 3 points
Offset Calibration +1 pH
Slope Calibration from 80 to 110%
Temperature Automatic or manual
Compensation from 0 to 100°C
Electrode HI1230B combination pH
Temp. Probe HI7669/2W with 1 m
Input Impedance 1012 Ohm
Power Supply 4x1.5V AA size batteries
RS232C Not Isolated
Operating from 0 to 50°C
Conditions (32 to 122°F)
Dimensions 196 x 80 x 60 mm
Weight 500 g (18 oz.) meter alone
°C 0.0 to 100.0
°C 0.1
with pH 4.01, 6.86, 7.01,
9.18 and 10 .01
buffers memorized
(32 to 212°F)
gel electrode (included)
(3.3') cable (included)
150 hours of con-
tinuous use; power
socket for 12VDC adapter
Available
95% RH max
(7.7 x 3.1 x 2.4")
7
FUNCTIONAL DESCRIPTION OF
HI 9625 & HI 96250
11
2
pH
°C
HI 9625
MICROCOMPUTER
pH METER
CAL CFMCFM
33
2
55
66
77
88
HI 96250
MICROCOMPUTER
pH METER
ON / OFFON / OFF
ALTALT
CAL
RANGERANGE TIMETIME CAL DATACAL DATA
pH
°C
4
1212
1111
1010
99
1. BNC socket for pH or ORP or ISE Electrode
2. RCA Socket for Temperature Probe
3. Socket for External Power Supply
4. Socket for RS232C connection cable (for
HI 96250 only)
5. Liquid Crystal Display
6. ON/OFF key, to turn the meter on or off
7. ALT, alternate function key
8. RANGE key, to select pH or mV measurement mode
9. CAL DATA key, to display last calibration data: date and time, offset and 2
slope values
10. TIME key, to display date and time
11. CFMÐ key, to confirm the calibration reading and DOWN arrow key to scroll down
12. CALÏ key, to enter or exit calibration
mode and UP arrow key to scroll up
8
SPECIFICATIONS OF HI 9625 & HI 96250
HI 9625 HI 96250
Range pH 0.00 to 14.00
Resolution pH 0.01
Accuracy pH +0.01
(@20°C/68°F) ISE (mV) ±0.2
Typical EMC pH +0.01
Deviation mV ±1
Calibration Automatic 1, 2 or 3 points
Offset Calibration +1 pH
Slope Calibration from 80 to 110%
Temperature Automatic or manual
Compensation from 0 to 100°C
Electrode HI1230B combination pH
Temp. Probe HI7669/2W with 1 m
Input Impedance 1012 Ohm
Power Supply 4x1.5V AA size batteries
RS232C Not Isolated
Operating from 0 to 50°C
Conditions (32 to 122°F)
Dimensions 196 x 80 x 60 mm
Weight 500 g (18 oz.) meter alone
ISE (mV) ±399.9
ORP (mV) ±1999
°C 0.0 to 100.0
ISE (mV) 0.1
ORP (mV) 1
°C 0.1
ORP (mV) ±1
°C +0.5
°C +0.5
with pH 4.01, 6.86, 7.01,
9.18 and 10 .01
buffers memorized
(32 to 212°F)
gel electrode (included)
(3.3') cable (included)
150 hours of con-
tinuous use; power
socket for 12VDC adapter
Available
95% RH max
(7.7 x 3.1 x 2.4")
9
OPERATIONAL GUIDE
INITIAL PREPARATION
Each meter is supplied complete with batteries.
Remove the back cover, unwrap
the batteries and install them
while paying attention to the polarity.
PROBES CONNECTION
To prepare the instrument for use connect
the pH electrode to the BNC socket on the
top of the instrument.
Connect the temperature probe to the RCA
socket.
COMBINATION
pH ELECTRODE
WITH BNC
CONNECTOR
HI 7669/2W
TEMPERATURE
PROBE
The temperature probe can be used independently to take temperature measurements, or
it can be used in conjunction with the pH
electrode to utilize the meter's ATC capability. If the probe is disconnected, temperature
can also be set manually with the UP and
DOWN arrow keys.
CAL
CFM
10
To switch the instruments
on, press and hold the
ON/OFF key.
The meter has a built-in pro-
ON/OFF
tection against electromagnetic interference and the delayed response
of the keys assures that the commands are
not mistaken for stray signals.
Before proceeding with pH measurements follow the calibration procedure (see page 19).
SETTING DATE AND TIME
Press the ALT and the TIME keys simultaneously. The display will show the date setting. At the bottom of the display the year will
be blinking.
ALT
TIME
DATE
Use the UP or the DOWN arrow keys to
select the year.
CAL
CFM
When the correct year is selected, press the
TIME key once. The month will start blinking.
DATE
TIME
11
Select the month by using the UP or the
DOWN arrow keys.
CAL
CFM
Press the TIME key. The day will start blinking.
DATE
TIME
Use the UP or the DOWN arrow key to
select the correct day.
CAL
CFM
Press the ALT and the TIME keys simultaneously. The display will now show the clock
time and the hour will start blinking.
ALT
TIME
To select the hour, press the UP or the
DOWN arrow keys (24 hour clock).
CAL
CFM
12
Press the TIME key once and the minutes
will start blinking.
TIME
Use the UP or the DOWN arrow keys to
select the minutes.
CAL
CFM
Press the ALT and the TIME keys simultaneously to leave this mode.
ALT
TIME
The date and time are now set and stored in
the memory even when the meter is switched
off.
13
VIEWING DATE / TIME / pH / mV** /
TEMPERATURE
Press the RANGE key to display the pH
measurement mode: the pH reading is on the
primary display, and the temperature is on
the secondary one.
pH
°C
RANGE
Press the RANGE key again (for HI 9625 and
HI 96250 only) to display mV measurements
together with the temperature (by pressing
the same key you can switch from pH and
mV measurement mode and vice-versa).
mV
°C
RANGE
To view the time press the TIME key and the
display will show hour and minutes.
TIME
To view the date, press the TIME key again.
The display will show month and day on the
primary display and year on the secondary
one.
DATE
TIME
**mV for HI9625 and HI96250 only
14
TO VIEW pH CALIBRATION DATA
Press the CAL DATA key and the meter will
display the last calibration data, in the following sequence:
- CAL indicator with month, day and year
DATE
CAL
CAL DATA
Press the CAL DATA key again and the
meter will display the last calibration time as:
- CAL indicator with hour and minutes.
CAL
CAL DATA
Press the CAL DATA key again, the display
will show the offset calibration factor as:
- CAL indicator with pH offset value
- pH offset calibration buffer value (BUF1)
pH
CAL
CAL DATA
pH
1
BUF
Note: The offset pH value should be between
±0.50pH.
For values higher than +0.50 pH or
lower than -0.50 pH the electrode is no
longer reliable and should be replaced.
15
Press the CAL DATA key again, the display
will show the first slope calibration factor as:
- CAL indicator with pH slope 1st value
- pH slope 1
st
calibration buffer value (BUF2)
CAL
pH
BUF
2
CAL DATA
Press the CAL DATA key again to display
the second slope calibration factor as:
- CAL indicator with pH slope 2nd value
- pH slope 2
nd
CAL DATA
calibration buffer value (BUF3).
CAL
pH
BUF
3
Press the CAL DATA key again to resume to
normal operation.
pH
°C
CAL DATA
Note: The slope characteristic of the pH elec-
trode is directly displayed in percentage of the theoretical value of 58.17mV
per pH unit at 20°C.
16
TAKING pH MEASUREMENTS
Secure the connections of the
pH electrode and the tempera-
COMBINATION
pH ELECTRODE
CONNECTOR
WITH BNC
HI 7669/2W
TEMPERATURE
PROBE
ture probe to the top of the
meter. If possible, use plastic
beakers to minimize any EMC
interferences.
To take pH measurements,
simply submerge the bottom
4 cm (1½") of the electrode
and the temperature probe in
the solution to be tested, stir
4 cm
(1½")
gently and allow for the electrode to adjust and stabilize.
Press the RANGE key to get into the pH
mode.
pH
°C
RANGE
In order to take more accurate pH measurements, make sure that the instrument is calibrated for pH by checking the last calibration
data (see page 13) and eventually calibrate it
before use (see page 19).
If measurements are taken successively in
different samples, it is recommended to rinse
the electrode thoroughly with deionized water
(or if not available tap water) first and then
with some of the next sample to test to
condition the electrode before taking a reading.
Note: When taking pH measurements, in or-
der to have the best accuracy and
proper temperature compensation, immerse the temperature probe as close
as possible to the pH electrode.
17
TEMPERATURE EFFECT ON pH
The pH reading is directly effected by temperature. In order for the meter to measure
the pH accurately, temperature must be taken
in consideration.
A perfect equilibrium between the pH electrode and the sample is reached in approximately 15 minutes.
To use the meter's Automatic Temperature
Compensation feature, submerge the temperature probe into the sample as close to
the electrode as possible and wait for 1-2
minutes. If you know the temperature of the
sample to be tested you can manually compensate for it.
If manual temperature compensation is
desired the temperature probe must be
disconnected from the instrument.
The display will show the default temperature of 25.0°C or
pH
°C
the last recorded temperature
reading. "°C" is blinking.
The temperature can now be adjusted with
the UP and DOWN arrow keys.
CAL
CFM
18
ORP MEASUREMENTS (HI9625 & HI96250)
HI 9625 and HI96250 have the capability to
take ORP measurements. An optional ORP
electrode must be used to perform these
measurements.
Secure the connection of the ORP electrode
to the BNC socket located on the top of the
meter.
If possible, use plastic beakers to minimize
any EMC interferences.
To get into the "mV" mode (ORP or ISE)
press the RANGE key until the display
changes to mV.
mV
°C
RANGE
To measure the mV of a solution simply submerge the ORP
or ISE electrode tip (4cm/1½")
into the sample to be tested.
Allow a few minutes for the
(1½
")
readings to stabilize.
4 cm
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 junction.
19
TAKING TEMPERATURE MEASUREMENTS
The HI7669/2W temperature probe that is
supplied with HI 9624, HI 96240, HI 9625 and
HI 96250 is a liquid/general purpose probe.
Taking a temperature measurement with these
meters is very easy.
The temperature is always displayed on the
secondary LCD.
pH
°C
mV
°C
Secure the connection of the
probe to the top of the meter,
and take the measurement (allow 1 or 2 minutes for the
temperature to stabilize).
If the temperature probe is
disconnected, the meter will
display "25.0 °C" (default
temperature) or the last re-
pH
°C
corded temperature reading.
The "°C" symbol blinks.
20
pH CALIBRATION
For greatest accuracy, it is recommended
that the instrument is calibrated frequently.
For a faster operation, it is possible to standardize the electrode at pH 7.01 only (one
point calibration), but it is always good practice to calibrate at least 2 points.
The standard calibration program of the meter,
however, is prepared for 3 (maximum) buffers.
There is a choice of 5 memorized standard
buffers:
1stbuffer (offset) pH 6.86 or 7.01
2ndbuffer (1st slope) pH 4.01
3rd buffer (2nd slope) pH 9.18 or 10.01
The calibration sequence values of the 2
and 3rd buffers can be reversed.
Due to electrode conditioning time the electrode must be kept immersed in the sample
for a few seconds to stabilize. The user will
be guided step by step with easy indications
on the display during the pH calibration. This
will make the calibration a simple and errorfree procedure.
nd
INITIAL PREPARATION
Pour small quantities of:
• pH 7.01 (HI7007/HI8007) or
4
0
0
7
I
H
HI 7004 HI 7007
pH 6.86 (HI7006/HI8006)
• pH 4.01 (HI7004/HI8004) or
• pH 10.01 (HI7010/HI8010) or pH 9.18
(HI7009/HI8009) solution into individual beakers.
If possible, use plastic
RINSE
CALIBRATION
beakers to minimize any
EMC interferences. For
HI 7007
HI 7007
accurate calibration use
two beakers for each
21
buffer solution, the first one for rinsing the
electrode, the second one for calibration. By
doing this, contamination between the buffers
is minimized.
To get accurate readings, use pH 7.01 (or
pH 6.86) and pH 4.01 if you are going to
measure acid samples, or pH 7.01 and
pH 10.01 (or pH 9.18) for alkaline measurements. A 3-point calibration can also be performed (pH 7.01, 4.01 and 10.01).
• Press the RANGE key to get into the pH mode.
pH
°C
RANGE
• Remove the protective cap from the electrode and rinse it with some of the buffer
calibration solution you are going to use
first.
PROCEDURE
• Rinse the electrode with some pH 7.01
(HI7007/HI8007) or pH 6.86 (HI7006/HI8006)
solution or clean water.
Dip the bottom 4 cm (1½")
of the electrode and the
temperature probe into a
beaker containing the 1
calibration solution (e.g.
st
(1½
")
HI 7007
pH 7.01).
• Press the ALT and the CAL keys simultaneously. The secondary (lower) LCD will
show “7.01” to indicate that pH 7.01 is
expected and the electrode is getting conditioned.
4 cm
ALT
CAL
22
CAL
pH
1
BUF
• When the “CFM” indicator starts blinking,
the calibration can be confirmed. Press the
ALT and CFM keys simultaneously to confirm the first buffer.
CFM
ALT
CFM
• If everything is satisfactory
the secondary LCD will
show “4.01” expecting the
CAL
pH
2
BUF
second buffer at pH 4.01.
• If the buffer is out of the
offset range, "WRONG "
as error message will blink.
WRONG
BUF
Note: If a single point calibration is required, press ALT and CAL keys to leave
the calibration mode. However, it is always
better to proceeds as follows for a two or
three point calibration.
ALT
CAL
• “4.01” can be changed to “10.01” or
“9.18” by pressing the CAL key.
CAL
23
• Rinse the electrode with some of the second buffer solution (e.g.
pH 4.01).
Dip the bottom 4 cm (1½")
of the electrode and the
temperature probe into a
(1½
")
HI 7004
beaker containing the second buffer.
• When the "CFM" indicator starts blinking,
indicating that the electrode has been stabilized, press the ALT and CFM keys to
confirm the second calibration point.
CFM
ALT
CFM
• If the buffer is out of the
slope range, "WRONG "
will blink.
WRONG
BUF
• If everything is satisfactory the secondary
LCD will blink "10.01" (if it
previously was "4.01") or
"4.01" (if it previously was
"10.01" or "9.18") expect-
CAL
pH
BUF
3
ing the third buffer.
• “10.01” can be changed
to “9.18” by pressing the
CAL key.
CAL
Note: if a two point cali-
bration is required,
press the ALT and CAL keys to leave
the calibration mode now.
4 cm
ALT
CAL
24
• Rinse the electrode with
some pH 10.01 (or pH 9.18)
solution. Dip the bottom 4
cm (1½") of the electrode
in a beaker containing the
(1½
")
HI 7010
third buffer.
• When the CFM indicator starts blinking,
indicating that the electrode has stabilized,
press the ALT and CFM keys to confirm
the third calibration point.
CFM
ALT
CFM
• If the buffer is out of the slope range,
"WRONG " will blink. Press the ALT and
CAL keys simultaneously and recalibrate
the value.
WRONG
BUF
ALT
CAL
4 cm
• If you cannot complete the calibration,
check your electrode by following the conditioning and maintenance procedure on
page 30 and repeat the calibration procedure from the beginning with fresh buffers.
The pH electrode might have to be replaced
if calibration cannot still be successfully
performed.
• If everything is satisfactory the calibration
ends and the meter will return to the pH
measurement mode.
25
During calibration, the characteristics of the
electrode will be memorized, and can be
recalled by pressing the CAL DATA key (see
operational guide on page 13).
This operation will display:
• date
DATE
CAL
CAL DATA
• time
CAL
CAL DATA
• the offset characteristic of the electrode in
pH units
pH
CAL
CAL DATA
pH
1
BUF
• the 1st slope in percentage of the theoretical value
CAL
CAL DATA
pH
BUF
2
• the 2nd slope in percentage of the theoretical value.
CAL
CAL DATA
26
pH
BUF
3
pH VALUES AT VARIOUS
TEMPERATURE
Temperature has an effect on pH. The calibration buffer solutions are effected 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 temperature (if used in conjunction
with the HI7669/2W temperature probe) or to
the manually set temperature.
TEMP pH VALUES
°C °F 4.01 6.86 7.01 9.18 10.01
0
32
4.01
10
15
20
25
30
35
40
45
50
55
60
65
70
6.98
5
41
4.00
6.95
50
4.00
6.92
59
4.00
6.90
68
4.00
6.88
77
4.01
6.86
86
4.02
6.85
95
4.03
6.84
104
4.04
6.84
113
4.05
6.83
122
4.06
6.83
131
4.07
6.84
140
4.09
6.84
149
4.11
6.85
158
4.12
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
For instance, if the buffer's temperature is
25°C, the display will show pH 4.01 or
7.01 or 10.01.
If the buffer's temperature is 20°C, the display
will show pH 4.00/7.03/10.06.
If the buffer's temperature is 50°C, the display
will show pH 4.06/6.98/9.82.
27
TEMPERATURE AND mV CALIBRATION
Each meter has been factory calibrated for
the temperature and mV and is ready for
measurements.
The temperature probes and ORP electrodes
are interchangeable and no temperature or
mV calibration is needed when the temperature probe or the ORP electrode is replaced.
If, for any reason, the temperature or the mV
measurements are out of accuracy, the temperature or the mV re-calibration should be
carried out.
For an accurate recalibration, contact your
nearest Hanna Service Center.
28
RS232C OUTPUT (HI96240 & HI96250)
Connect the HI 96240 or the HI 96250 to a PC
through the RS232C output (the connector is
located on the top of the meter).
SPECIFICATIONS:
Baud Rate: 2400
Start bit: 1
Stop bit: 1
Parity bit: none
Command Prefix: DLE
Isolated
SENDING COMMANDS FROM PC
With terminal programs such as Telix® and
Windows Terminal®, it is possible to remotely
control your pH meter. Connect the meter to
the 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:
<DLE> <command> <CR>
The computer sends a Data Link Escape
character, the command expressed as a number or a 3-character sequence) and a CR
character.
Note: Windows Terminal® and all other termi-
nal programs that support the ANSI
escape sequence, represent the DLE
character by the string '^P' and the CR
character by the string '^M'. E.g. the
line '^PPHR^M' sets the range to pH.
Windows Terminal® are registered Trademark of "Microsoft Co."
TELIX® is registered Trademark of "Deltacomm"
29
Commands not requiring an answer from
the pH meter:
PHR sets the range to pH
MVR sets the range to mV (for HI 96250 only)
Commands requiring an answer:
PH? Causes the meter to send the pH value
(6 characters). If the reading is out of
range "Err 1" is sent.
E.g. "14.00" + cr for pH 14.00
MV? Causes the meter to send the mV value
(5 or 6 characters). If the reading is out
of range "Err 2" is sent.
E.g. "-399.9" + cr for -399.9 mV
"-1999" + cr for -1999 mV
(for HI 96250 only)
TM? Causes the meter to send the tempera-
ture value (6 characters).
E.g. "100.0" + cr for 100.0°C
CS? Requests the meter to send the pH cali-
bration status (39 characters). The order
of data is as follows:
xx minutes (2 characters)
xx hour (2 characters)
xx day (2 characters)
xx month (2 characters)
xx year (2 characters)
xxxxx offset buffer (5 characters)
xxxxx offset factor (5 characters)
xxxxx slope 1 buffer (5 characters)
xxxx slope 1 factor (4 characters)
xxxxx slope 2 buffer (5 characters)
xxxx slope 2 factor (4 characters)
x cr (1 characters)
E.g. "01", "02," "03", "04", "96, "07.01",
"00.00", "04.01", "0100", "10.01", "0100",
+ cr
for 02:01 h on 3-apr. 96
30
offset buffer is pH 7.01, offset factor is
0.00 pH
slope 1st is pH 4.01, slope 1 factor is
100%
slope 2nd is pH 10.01, slope 1 factor is
100%
Note: The meter will send <CAN> if a cor-
rupted or unknown command is received.
These commands may be sent with either
capital or small letters. Invalid commands will
be ignored. The characters sent by the pH
meter are always capital letters.
31
ELECTRODE CONDITIONING
AND MAINTENANCE
Reference
Filling Hole
Fill Hole
Screw
Reference
Filling Hole
Sensitive
Wire
Reference
Wire
Reference
Junction
Glass
Bulb
Reference
Wire
Reference
Junction
Platinum or
Gold tip
Plastic Body
pH Electrode
Reference
Plastic Body
ORP Electrode
Glass Body
pH Electrode
Wire
Glass Body
ORP Electrode
Reference
Wire
Sensitive
Wire
Reference
Junction
Glass
Bulb
Reference
Junction
Platinum or
Gold tip
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 have
formed inside the glass bulb. The electrode
cannot function properly under these condi-
32
tions. These bubbles can be removed by
"shaking down" the electrode as you would
do with a glass thermometer.
If the bulb and/or junction are dry, soak the
electrode in HI70300 or HI 80300 Storage
Solution for at least one hour.
For refillable electrodes:
If the filling solution (electrolyte) is more than
1 cm (½") 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, loosen the fill hole
screw during measurements.
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 (4 cm /1½") in the sample
and stir gently for at least 30 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 (HI7071 or HI 8071 for single junc-
AmpHel® is a registered Trademark of "Hanna Instruments"
33
tion 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 WATER OR DRY.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable
used for the 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 HI7082 or HI 8082 for double junction electrodes). Allow the electrode to stand upright
for 1 hour.
Follow the Storage Procedure above.
CLEANING PROCEDURE
General Soak in Hanna HI 7061 or HI 8061
General Cleaning Solution for
approximately 1 hour.
Removal of films, dirt or deposits on the
membrane/junction:
- Protein Soak in Hanna HI 7073 or HI 8073
Protein Cleaning Solution for
15 minutes.
- Inorganic Soak in Hanna HI 7074 or HI 8074
Inorganic Cleaning Solution
for 15 minutes.
- Oil/grease Rinse with Hanna HI7077 or
HI 8077 Oil and Fat Cleaning
Solution.
34
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
Evaluate your electrode performance based
on the following.
• Noise (Readings fluctuate up and down)
could be due to:
- Clogged/Dirty Junction: Refer to the
Cleaning Procedure above.
- Loss of shielding due to low electrolyte
level (in refillable electrodes only): refill
with fresh HI 7071 or HI 8071 for single
junction or HI 7082 or HI 8082 for double
junction electrodes.
• Dry Membrane/Junction: Soak in Storage Solution HI70300 or HI 80300 for at
least 1 hour.
• Drifting: Soak the electrode tip in warm
Hanna Solution HI7082 or HI 8082 for one
hour and rinse tip with distilled water.
Refill with fresh HI 7071 or HI 8071 for
single junction electrodes and HI 7082 or
HI 8082 for double junction electrodes.
• Low Slope: Refer to the cleaning proce-
dure above.
• No Slope: Check the electrode for cracks
in glass stem or bulb and replace the
electrode.
• Slow Response/Excessive Drift: Soak
the tip in Hanna Solution HI 7061 or HI 8061
for 30 minutes, rinse thoroughly in distilled water and then follow the Cleaning
Procedure above.
35
BATTERY REPLACEMENT
-
When the batteries are run
down an extra decimal point
is displayed on the Liquid
Crystal Display to warn the
user.
Battery replacement must only take place in
a non hazardous area using the battery types
specified in this instruction manual (see
page 46).
In order to replace run down
batteries, simply remove the
two screws on the rear cover
of the instrument and replace
the four 1.5V AA batteries with
new ones, paying attention to
the correct polarity.
A 12VDC power source can also be used to
power the unit (see the Accessories section
page 45).
Note: The instrument uses the following con-
figuration:
pH
°C
+
It is recommendable to purchase the Hanna
HI710005 and HI710006 voltage adapters that
use the proper polarity configuration.
Anyway, HI 9624, HI 9625, HI 96240 and
HI 96250 can be used with other adapters. In
this case, remember to check the correct
polarity of your adapter before connecting it
to the meter.
36
TROUBLESHOOTING GUIDE
1
2
Symptoms Problem Solution
The meter does
not work with the
temperature probe
The meter fails to
calibrate or gives
faulty readings
The meter is slow
in responding or
gives faulty
readouts
The meter does
not accept the 2
buffer solution for
calibration
The reading drifts
Display reads
"--.--" in the pH
mode
Display reads "°C"
blinking
Display reads "E3"
"--.--" in the mV
mode
"WRONG
BUF
and/or
"WRONG "
"WRONG
BUF
and/or
"WRONG "
nd
"
"
Defective ATC
probe
Defective pH
electrode
The electrode is
not working or
the reference
junction is
clogged
Defective pH
electrode
Defective pH
electrode
Out of range-pH
scale
Out of range-°C
scale or probe
not connected
Out of range-mV
scale
Erroneous
buffer solution
used for offset
calibration
Defective
electrode
Erroneous
buffer solution
used for 1
st
slope calibration
Defective
electrode
37
Replace the probe
Replace the electrode
Leave the electrode in
a storage solution after
cleaning the junction. If
problem persists,
replace the electrode
Follow the cleaning
procedure. If this
doesn't work replace
the electrode
Replace the electrode
a) Check the calibration
b) Assure the pH sample
is in the range 0 to 14
c) Check the level of
electrolyte and the
state of the electrode
itself
Make sure the °C is within
0-100° and temperature
probe is plugged
Electrode not connected
Make sure the buffer
solution used is pH7 and
replace if necessary
Replace the electrode
Use fresh buffer solution
Replace the electrode
2
Symptoms Problem Solution
"WRONG
and/or
"WRONG "
BUF
"
3
Erroneous
buffer solution
used for 2
Use fresh buffer solution
nd
slope calibration
Defective
Replace the electrode
electrode
38
0
0+10+20+30+40+50+60+70+80+90
C
TEMPERATURE-RESISTANCE
CORRELATION FOR HANNA PH
SENSITIVE GLASS
The resistance of glass electrodes partially
depends on the temperature. The lower the
temperature, the higher the resistance. It takes
longer 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 10°C.
Ω
9
2x10
-10
9
1x10
-10
8
-10
2x10
8
1x10
-10
7
2x10
-10
-10
7
1x10
-10
-10
-20-2
Since the resistance of the pH electrode is in
the range of 200 Mohm, 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 for 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.
39
Typical Electrode Life
Ambient Temperature 1- 3 years
90 °C Less than 4 months
120°C Less than 1 month
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 the alkaline error and
causes the pH readings to be underestimated.
Hanna's glass formulations have the indicated
characteristics.
Alkaline Error
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
40
ACCESSORIES
pH CALIBRATION SOLUTIONS
HI774P pH 4.01 & 7.01 Buffer Solution,
30 mL each
HI 7004M pH 4.01 Buffer Solution, 230 mL
HI 7004L pH 4.01 Buffer Solution, 460 mL
HI 7006M pH 6.86 Buffer Solution, 230 mL
HI 7006L pH 6.86 Buffer Solution, 460 mL
HI777P pH 7.01 Buffer Sol. 2x30 mL
HI 7007M pH 7.01 Buffer Solution, 230 mL
HI 7007L pH 7.01 Buffer Solution, 460 mL
HI 7009M pH 9.18 Buffer Solution, 230 mL
HI 7009L pH 9.18 Buffer Solution, 460 mL
HI7710P pH 7.01 & 10.01 Buffer Solution,
30 mL each
HI 7010M pH 10.01 Buffer Solution, 230 mL
HI 7010L pH 10.01 Buffer Sol., 460 mL
pH CALIBRATION SOLUTIONS IN FDA APPROVED BOTTLE
HI 8004L pH 4.01 Buffer Solution, 460 mL
HI 8006L pH 6.86 Buffer Solution, 460 mL
HI 8007L pH 7.01 Buffer Solution, 460 mL
HI 8009L pH 9.18 Buffer Solution, 460 mL
HI 8010L pH 10.01 Buffer Solution, 460 mL
ELECTRODE STORAGE SOLUTIONS
HI 70300M Storage Solution, 230 mL
HI 70300L Storage Solution, 460 mL
ELECTRODE STORAGE SOLUTIONS IN
FDA APPROVED BOTTLE
HI 80300M Storage Solution, 230 mL
HI 80300L Storage Solution, 460 mL
41
ELECTRODE CLEANING SOLUTIONS
HI 7061M General Cleaning Sol., 230 mL
HI 7061L General Cleaning Sol., 460 mL
HI 7073M Protein Cleaning Sol., 230 mL
HI 7073L Protein Cleaning Sol., 460 mL
HI 7074M Inorganic Cleaning Sol., 230 mL
HI 7074L Inorganic Cleaning Sol., 460 mL
HI 7077M Oil & Fat Cleaning Sol., 230 mL
HI 7077L Oil & Fat Cleaning Sol., 460 mL
ELECTRODE CLEANING SOLUTIONS IN
FDA APPROVED BOTTLE
HI 8061M General Cleaning Solution, 230 mL
HI 8061L General Cleaning Solution, 460 mL
HI 8073M Protein Cleaning Solution, 230 mL
HI 8073L Protein Cleaning Solution, 230 mL
HI 8077M Oil & Fat Cleaning Solution, 230 mL
HI 8077L Oil & Fat Cleaning Solution, 460 mL
REFILLING ELECTROLYTE SOLUTIONS
HI 7071 3.5M KCl + AgCl Electrolyte,
4x50 mL, for single junction electrodes
HI 7072 1M KNO3 Electrolyte, 4x50 mL
HI 7082 3.5M KCl Electrolyte, 4x50 mL,
for double junction electrodes
REFILLING ELECTROLYTE SOLUTIONS IN
FDA APPROVED BOTTLE
HI 8071 3.5M KCl + AgCl Electrolyte,
4x50 mL, for single junction electrodes
HI 8072 1M KNO3 Electrolyte, 4x50 mL
HI 8082 3.5M KCl Electrolyte, 4x50 mL,
for double junction electrodes
42
pH ELECTRODES
B = BNC CONNECTION PLUG + 1 m (3.3’) CABLE
S = SCREW-TYPE CONNECTOR
HI 1043B / HI1040S
Glass-body, double junction, refillable, combination pH electrode. Use: strong acid/alkali.
12 mm
0.5"
HI 1043
"S" VERSION
9.5mm DIA
120 mm
4.7"
0.37"
HI 1053B / HI1050S
Glass-body, triple ceramic, conic shape, refillable, combination pH electrode. Use: emulsions.
12 mm
0.5"
HI 1053
"S" VERSION
120 mm
4.7"
HI 1083B
Glass-body, micro, Viscolene, nonrefillable,
combination pH electrode. Use: biotechnology,
micro titration.
HI 1083
12 mm
0.5"
5 mm
0.2"
120 mm
43
3 mm
0.12"
"
3.0 mm DIA
0.12"
HI 1131B / HI1111S
Glass-body, single junction, refillable, combination pH electrode. Use: general purpose.
12 mm
0.5"
HI 1131
"S" VERSION
9.5mm DIA
120 mm
4.7"
0.37"
HI 1330B / HI1310S
Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: laboratory.
HI 1330
"S" VERSION
120 mm
4.7"
5mm DIA
0.2"
5mm
0.2"
HI 1331B / HI1311S
Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: flasks.
HI 1331
"S" VERSION
8 mm
0.3"
7.5mm DIA
210 mm
8.25"
0.29"
HI 1230B / HI1210S
Plastic-body (Ultem®), double junction, gelfilled, combination pH electrode. Use: general
purpose.
12 mm
0.5"
HI 1230
120 mm
"
"
4.7"
ULTEM® is registered Trademark of "General Electrics Co."
44
HI 2031B / HI2020S
Glass-body, semimicro, conic, refillable, combination pH electrode. Use: semisolid products.
6 mm
0.25"
HI 2031
75 mm
"
"
2.95"
HI 1332B / HI1312S
Plastic-body (Ultem®), double junction, refillable, combination pH electrode. Use: general
purpose.
12 mm
0.5"
HI 1332
"S" VERSION
120 mm
4.7"
FC 100B
Plastic-body (Kynar®), double junction, refillable, combination pH electrode. Use: general
purpose for food industry.
12 mm
0.5"
FC 100
120 mm
4.7"
FC 200B / FC 200S
Plastic-body (Kynar®), single junction, conic,
Viscolene, refillable, combination pH electrode.
Use: meat & cheese.
6 mm
0.25"
FC 200
75 mm
2.95"
Kynar® is registered Trademark of "Pennwalt Corp."
ULTEM® is registered Trademark of "General Electrics Co."
45
FC 210B
Glass-body, double junction, conic, Viscolene,
combination pH electrode. Use: milk, yogurt.
12 mm
0.5"
FC 210
120 mm
4.7"
FC 220B
Glass-body, single junction, refillable, combination pH electrode. Use: food & wine process-
ing.
12 mm
0.5"
FC 220
9.5mm DIA
120 mm
4.7"
0.37"
FC 911B
Plastic-body (Kynar®), double junction, refillable with built-in amplifier, combination pH
electrode. Use: very high humidity.
12 mm
0.5"
FC 911
110 mm
4.3"
HI 1413B / HI1410S
Glass-body, single junction, flat tip, Viscolene,
combination pH electrode. Use: surface mea-
surement.
12 mm
0.5"
HI 1413
110 mm
4.3"
Kynar® is registered Trademark of "Pennwalt Corp."
46
Extension cables for screw-type electrodes
only (screw to BNC connector)
HI7855/1 Extension cable 1m (3.3') long
HI7855/3 Extension cable 3m (9.9') long
HI7855/5 Extension cable 5m (16.5') long
HI7855/10 Extension cable 10m (33') long
HI7855/15 Extension cable 15m (49.5') long
HI 7855 SERIES CABLE CONNECTORS
CONNECTOR AND 3.0 mm (0.12") CABLE WITH BNC
CONNECT TO
SCREW TYPE
ELECTRODES
CONNECT TO THE
BNC SOCKET
OF THE METER
POWER UNITS
HI 710005 Voltage adapter from 115 VAC
to 12 VDC
HI 710006 Voltage adapter from 230 VAC
to 12 VDC
47
OTHER ACCESSORIES
HI 710031 Rugged carrying case
HI 721308 1.5V AA alkaline battery (10 pcs)
HI 76405 Electrode holder
HI 7669/2W Temperature probe with 1 m
(3.3') screened cable
HI 92000/16 Windows® 3.11 software for con-
nection to PC (HI 96240 and
HI 96250 only)
HI 92000/32 Windows® 95 software for con-
nection to PC (HI 96240 and
HI 96250 only)
HI 920011 4 to 25-pin cable for connection
to PC (HI 96240 and HI 96250)
HI 920011/9 4 to 9-pin cable for connection to
PC (HI 96240 and HI 96250)
HI 931001 pH and ORP electrode simula-
tor with LCD display 1 m (3.3')
coaxial cable ending in female
BNC connectors (HI 7858/1)
MAN9624R1 Instruction manual
Windows® is registered Trademark of "Microsoft Co."
48
ELECTRODE APPLICATION
REFERENCE GUIDE
Application Electrodes
1. Aquarium HI1332B, HI 1911B, HI1312S
2. Bath-water HI1910B, HI 1130B, HI 1110S
3. Beer HI1131B, HI 1111S
4. Bread HI2031B, FC 200B, HI 2020S, FC200S
5. Cheese FC200B, FC 200S
6. Dairy products FC 911B, FC100B
7. Dirty water HI 1910B, HI 1912B
8. Emulsions HI1053B, HI 1050S
9. Environment HI1230B, HI 1210S
10.Flasks HI1331B, HI 1310S
11. Food industry general use FC 911B, FC 100B
12. Fruit FC 200B, FC220B, FC 200S
13. Fruit juices, organic FC 210B
14. Galvanizing waste solution HI 1130B, HI 1912B, HI1110S
15. Heavy-duty applications HI1135B, HI 1115S
16. High purity water HI 1053B, HI 1050S
17. Horticulture HI 1053B, FC200B, HI 1050S, FC 200S
18. In-line applications HI 1134B, HI 1135B, HI2114B, HI 2910B,
19. Laboratory general use HI 1131B, HI 1230B, HI 1332B, HI1330B
20. Leather HI1413B, HI 1410S
21. Lemon juice FC100B
22. Me at FC 200B, HI2031B, FC 200S, HI 2020S
23. Micro plate sampling of less than HI 1083B, HI1080S
100 mL
24. Milk and Yogurt FC 210B
25.Paints HI1053B, HI 1050S
26. Paper HI 1413B, HI1410S
27. Photographic chemicals HI1230B, HI 1210S
28. Quality control HI 1332B, HI1312S
29.Sausages FC200B, HI 2031B, FC 200S, HI2020S
30. Semisolid products HI 2031B, HI 2020S
31.Skin HI1413B, HI 1410S
32. Soil samples HI1230B, HI 1210S
33. Sol ven ts HI 1043B, HI1040S
34. Strong acid HI 1043B, H I1040S
35. Submersion application HI 1130B, HI1110S
36. Surface measurements HI 1413B, HI 1410S
37. Swimming pool H 1130B, HI 2114B, HI 2910B
38. Titrations with constant temperature HI 1131B, HI1111S
range
39. Titrations with wide temperature HI 1131B, HI 1111S
range
40. Very high humidity FC 911B, HI 1912B, HI 1911B
41. Vials and test tube HI 1330B, HI 1310S
42. Wine processing FC 220B
HI1114S, HI 1115S
HI1111S, HI 1210S, HI 1312S, HI 1310S
B = BNC connection plug
S = Screw-type connection plug
49
WARRANTY
All Hanna Instruments meters are warranted
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 warranted for a period of six months.
This warranty is limited to repair or replacement free of charge.
Damages due to accident, 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 failure. 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 Customer Service department and then send it
with shipment costs prepaid. When shipping
any instrument, make sure it is properly packaged for complete protection.
To validate your warranty, fill out and return
the enclosed warranty card within 14 days
from the date of purchase.
All rights are reserved. Reproduction in whole
or in part is prohibited without the written
consent of the copyright owner.
Hanna Instruments reserves the right to
modify the design, construction and appearance of its products without advance notice.
50
CE DECLARATION OF CONFORMITY
DECLARATION OF CONFORMITY
We
Hanna Instruments Srl
V.le delle industrie 12
35010 Ronchi di Villafranca (PD)
ITALY
herewith certify that the pH meters
HI 9624 HI 9625 HI 96240 HI 96250
have been tested and found to be in compliance with the following regulations:
IEC 801-2 Electrostatic Discharge
IEC 801-3 RF Radiated
IEC 801-4 Fast Transient
EN 55022 Radiated, Class B
Date of Issue: 15-05-1996
D.Volpato - Engineering Manager
On behalf of
Hanna Instruments S.r.l.
Recommendations for Users
Before using these products, make sure that they are entirely suitable for the
environment in which they are used.
Operation of these instruments in residential area could cause unacceptable
interferences to radio and TV equipments, requiring the operator to take all necessary
steps to correct interferences.
The glass bulb at the end of the electrode is sensitive to electrostatic discharges.
Avoid touching this glass bulb at all time.
During calibration of instruments, ESD wrist straps should be worn to avoid possible
damage to the electrode by electrostatic discharge.
Any variation introduced by the user to the supplied equipment may degrade the
instrument's EMC performance.
To avoid electrical shock, do not use these instruments when voltages at the
measurement surface exceed 24VAC or 60 VDC.
To avoid damages or burns, do not perform any measurement in microwave ovens.
51
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52
MAN9624R1
05/96
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