Hanna Instruments HI8417 User manual

HI8417 - HI8519
HI8520 - HI8521
Microprocessor
Bench-top
pH Meters
Instruction Manual
http://www.hannainst.com These Instruments are in
Compliance with the CE Directives
HI 8417
°C
pH
mV
pH
OFF
ON
CON
CAL °C
°C
d2
t2
d1
t1 pH
pH 6,88
7,02
4,00
4,00
9,22
10,05
pH
pH
pH
pH
BUFFER VALUES 20°C
NBS
STD
NBS
STD
NBS
STD
d3
t3

2
Dear Customer,
Thank you for choosing a Hanna Instruments Product.
Please read this instruction manual carefully before using the instru-
ment.
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 CSA, UL and (EN
50081-1 and EN 50082-1) directives.
PRELIMINARY EXAMINATION 3
GENERAL DESCRIPTION 3
FUNCTIONAL DESCRIPTION AND SPECIFICATIONS:
HI8417 5
HI8519 8
HI8520 10
HI8521 12
OPERATIONAL GUIDE 14
PH CALIBRATION 18
PROCEDURE FOR HI8417 18
PROCEDURE FOR HI8519 20
PROCEDURE FOR HI8520/HI8521 21
CAL. W/ MANUAL TEMP. COMPENSATION 22
PH VALUES AT VARIOUS TEMPERATURE 23
TEMPERATURE CALIBRATION 23
TROUBLESHOOTING GUIDE 24
ELECTRODE CONDITIONING & MAINTENANCE 25
TEMPERATURE-RESISTANCE CORRELATION
FOR HANNA PH SENSITIVE GLASS 28
ACCESSORIES 30
ELECTRODE APPLICATION REFERENCE GUIDE 37
WARRANTY 38
CE DECLARATION OF CONFORMITY 39
TABLE OF CONTENTS
ISO 9000 Certified
Company since 1992

3
HI8417, HI8519, HI8520 and HI8521 Hanna Instruments bench-
top pH meters are designed for simplicity of use.
They feature: large liquid crystal display (LCD), user friendly key-
board, error codes to guide the user in calibration and troubleshooting
and storage of calibration data even after the unit is shut off.
HI8417, HI8519 and HI8521 can also measure ion concentration
(ISE) and ORP in the mV range (with automatic range switching from
ISE to ORP when reading exceeds ±399.9mV, HI8417 and HI8521
only).
All models, except for HI8519, are microprocessor-based and
provide automatic or manual temperature compensation for
both calibration and measurement.
These models meet the most stringent demands of the laboratory:
HI8417 pH/mV/°C meter automatically recognizes six standard
calibration buffer values-three each for NBS (pH 4.01, 6.86, 9.18)
technical standard calibration buffers (pH 4.01, 7.01, 10.01).
A recorder output of 0 to 2 Volts is available and the wide mV range
and high resolution allow for ORP or ion-selective measurement.
HI8417 comes supplied with HI1131B glass-body combination pH
electrode, HI7669/2W temperature probe (with 1 meter / 3.3' cable),
12VDC adapter (HI710005 or HI710006) and a dust cover.
HI 8519 pH/mV meter includes: manual temperature compensation
and front panel knobs for offset and slope calibration.
HI8519 comes supplied with HI1332B plastic-body combination pH
electrode, 12VDC adapter (HI710005 or HI710006) and a dust
cover.
GENERAL DESCRIPTION
PRELIMINARY EXAMINATION
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.
Note: Save all packing material until you are sure that the instru-
ment functions correctly. All defective items must be returned
in the original packing with the supplied accessories.

4
HI8520 pH/°C meter automatically recognizes 3 standard calibration
buffer values (4.01, 7.01 and 10.01 pH).
HI8520 comes supplied with HI1332B plastic-body combination pH
electrode, HI7669/2W temperature probe (with 1 meter/ 3.3' cable),
12VDC adapter (HI710005 or HI710006) and a dust cover.
HI8521 pH/mV/°C meter automatically recognizes 3 standard cali-
bration buffer values (4.01, 7.01 and 10.01 pH).
HI8521 comes supplied with HI1332B plastic-body combination pH
electrode, HI7669/2W temperature probe (with 1 meter/ 3.3' cable),
12VDC adapter (HI710005 or HI710006) and a dust cover.

5
HI 8417
°C pH
mV
pH
OFF
ON
CON
CAL °C
°C
d2
t2
d1
t1 pH pH 6,88 7,02
4,00
4,00
9,22
10,05
pH
pH
pH
pH
BUFFER VALUES 20°C
NBS
STD
NBS
STD
NBS
STD
d3
t3
THE FRONT PANEL OF HI8417
ON / OFF To turn the instrument ON and OFF. (Warning:
Push the OFF key before unplugging instrument. If unplugged before
turned off, the meter's memory will be erased).
CAL To enter the calibration mode.
CON To confirm the calibration data.
°C / °C To set temperature for manual compensation.
pH/mV To select mV for mV, ORP or ISE measurements
or pH for pH measurements.
Large LCD on the left
This LCD displays the temperature measured by the HI7669/2W
probe or the value set manually with the keyboard. If the tempera-
ture has been set manually, the "°C" symbol will flash. When the
temperature probe is connected the "°C" symbol stops flashing. When
the temperature measured by the probe is out of range (-10 /
+125°C), the "Err3" signal appears.
Large LCD on the right
This LCD displays the pH or mV reading. The corresponding pH or mV
symbol will be displayed along with the measured value. An error
signal ("Err1", "Err2", "Err4" or "Err5") will appear on this display to
indicate when the range is exceeded or if the buffer during calibration
is wrong.
FUNCTIONAL DESCRIPTION &
SPECIFICATIONS OF HI8417

6
COMBINED
pH or ORP
ELECTRODES
REFERENCE
ELECTRODE RESET RECORDER
0-2 VOLT
TEMPERATURE
PROBE
123 456
DC POWER
12V to 20V
+
THE REAR PANEL OF HI8417
1. BNC socket for pH and ORP electrode.
2. Reference Jack socket for reference electrode.
3. RESET button.
4. Recorder output connections.
5. Temp. Probe socket (for HI7669/2W).
6. DC Power Socket (for HI710005 or HI710006).
Electrode and probe connections
For combination pH or ORP electrodes (with internal reference) plug
the electrode's BNC to the socket provided (#1).
For an electrode with a separate reference, connect the measuring
electrode's BNC to the BNC socket (#1) and the reference electrode's
jack to the socket provided (#2).
For temperature measurements and automatic temperature com-
pensation connect the temperature probe to the °C socket (#5).
Recorder Output
HI8417 is provided with a recorder output from 0 to 2 volts. Connect
the recorder output (#4) and select the pH or mV range by pressing
the pH/mV key. The output signal is related to the values as follows:
pH output: 0.01 pH = 1.42857 mV
e.g. 0.00 pH = 0 mV
7.00 pH = 1000 mV
14.00 pH = 2000 mV
mV output: 0.1 mV= 0.05 mV
e.g. -1999 mV = 0 mV
0.0 mV = 1000 mV
+1999 mV = 2000 mV
The output impedance is 100 ohms. The maximum output short-
circuit current is 20 mA.
RESET button
The RESET button (#3) is used when the instrument displays errone-
ous messages due to strong electrical interference or when the

7
instrument's power supply is disconnected before the meter is switched
off. Press the RESET button and restart the entire operation.
Power connection
Plug the 12VDC adapter (HI710005 or HI710006) into the DC socket
(#6).
Note: Make sure the main line is protected by a fuse.
Note: HI8417 uses a rechargeable battery to retain the pH calibra-
tion data. It lasts approximately one month when fully charged. The
battery is automatically charged any time the meter is plugged-in
(either turned on or off).
SPECIFICATIONS HI8417
Range pH 0.00 to 14.00
ISE 0.0 to ±399.9mV
ORP ±1999mV
°C -10.0 to 125.0
Resolution pH 0.01
ISE 0.1mV
ORP 0.1/1mV
°C 0.1
Accuracy pH ±0.01
(@ 20°C / 68°F)ISE ±0.2 mV
ORP ±1 mV
°C ±0.5
Typical EMC pH ±0.01
Deviation ISE/ORP ±0.2mV
°C ±0.7
Recorder pH 0 to 2 V
Output mV 0 to 2 V
Max. Current 20mA
Offset ±1 pH
Slope from 85% to 105%
Calibration Automatic 2 points with 5 memorized buffers
(pH 4.01, 6.86, 7.01, 9.18, 10.01)
Temperature Manual from 0 to 100°C (32 to 212°F)
Compensation Automatic from -10 to 125°C (14 to 257°F)
Electrode HI1131B glass body combination refillable
pH electrode (included)
Temp. Probe HI7669/2W Temperature Probe (included)
Input Impedance 1012 ohm
Power Power socket for 12VDC
Environment 0 to 50°C (32 to 122°F);
95% RH (not condensing)
Dimensions 230Lx170Wx70H mm (9.1x6.7x2.7")
Shipping Weight 1.5 Kg (3.3 lb.)

8
Temperature Buffer Values (pH)
°C °F 4.01 7.01 10.01
0
10
20
30
40
32
50
68
86
104
4.01
4.00
4.00
4.02
4.04
7.13
7.07
7.03
7.00
6.98
10.32
10.18
10.06
9.96
9.88
pH mV
°C
OFFSET TEMPERATURE °C
SLOPE
HI 8519
ON
OFF
pH
OFFSET SLOPE TEMPERATURE °C
FUNCTIONAL DESCRIPTION &
SPECIFICATIONS OF HI8519
THE FRONT PANEL OF HI8519
ON/OFF To switch the meter ON and OFF.
pH To display pH values.
mV To display mV values.
°C To display temperature values set by the temperature knob
(for pH compensation).
Knobs
OFFSET For adjustment of offset during pH calibration.
SLOPE For adjustment of slope during pH calibration.
TEMP °CFor setting temperature in °C.
THE REAR PANEL OF HI8519
1. BNC socket for pH or ORP electrode.
2. Reference Jack socket for reference electrode.
3. DC Power Socket (for HI710005 or HI710006).
COMBINED pH
ORP
ELECTRODES
REFERENCE
ELECTRODE
THIS METER IS NOT
PROTECTED BY FUSE
12 3
DC POWER
12V to 20V
+

9
Electrode and probe connections
For combination pH or ORP electrodes (with internal reference) plug
the electrode's BNC to the socket provided (#1).
For an electrode with a separate reference, connect the measuring
electrode's BNC to the BNC socket (#1) and the reference electrode's
jack to the socket provided (#2).
Power connection
Plug the 12VDC adapter (HI710005 or HI710006) into the DC socket
(#3).
Note: Make sure the main line is protected by a fuse.
SPECIFICATIONS HI 8519
Range pH 0.00 to 14.00
mV ±1999
Resolution pH 0.01
mV 1
Accuracy pH ±0.01
(@20°C / 68°F) mV ±1
Typical EMC pH ±0.06
Deviation mV ±4
Calibration Manual 2 points through
offset and slope knobs
Temperature Manual from 0 to 100°C
Compensation (32 to 212°F)
Electrode HI 1332B plastic body, combination,
double junction refillable
pH electrode (included)
Input Impedance 1012 ohm
Power 12VDC power
Environment 0 to 50°C (32 to 122°F); 95% RH
Dimensions 230x170x70 mm (9.1x6.7x2.7")
Shipping Weight 1.35 Kg (3 lb.)

10
RANGE
OFF
Temperature Buffer Values (pH)
°C
°F 4.01 7.01 10.01
0
10
20
30
40
32
50
68
86
104
4.01
4.00
4.00
4.02
4.04
7.13
7.07
7.03
7.00
6.98
10.32
10.18
10.06
9.96
9.88
CON
ERROR SYMBOLS
°C
CAL ON
E1: pH out of range
E2: °C out of range
E4: wrong pH 7
E5: wrong pH 4/10
FUNCTIONAL DESCRIPTION &
SPECIFICATIONS OF HI8520
THE FRONT PANEL OF HI8520
ON / OFF To switch instrument ON and OFF.
RANGE To display pH or temperature measurements.
CAL/CON CAL to enter the calibration procedure and CON to
confirm calibration data.
/ For setting temperature for manual compensation.
THE REAR PANEL OF HI8520
1. BNC socket for pH electrode.
2. Reference Jack socket for reference electrode.
3. RESET button.
4. Temperature Probe socket (for HI7669/2W).
5. DC Power Socket (for HI710005 or HI710006).
Electrode and probes connections
For combination pH electrodes (with internal reference) plug the
electrode's BNC to the socket provided (#1).
For an electrode with a separate reference, connect the measuring
electrode's BNC to the BNC socket and the reference electrode's jack
to the socket provided (#2).
For temperature measurements and automatic temperature com-
pensation connect the temperature probe to the °C socket (#4).
RESET button
The RESET button (#3) is used when the instrument displays errone-
ous messages due to strong electrical interference or when the
instrument's power supply is disconnected before the meter is switched
COMBINED
pH or ORP
ELECTRODES
REFERENCE
ELECTRODE RESET
TEMPERATURE
PROBE
123 45
DC POWER
12V to 20V
+

11
off. Press the RESET button and restart the entire operation.
Power connection
Plug the 12VDC adapter (HI710005 or HI710006) into the socket on
the back of the meter (#5).
Note: Make sure the main line is protected by a fuse.
Note: HI8520 uses a rechargeable battery to retain the pH calibra-
tion data. It lasts approximately one month when fully charged.
The battery is automatically charged any time the meter is
plugged-in (either turned on or off).
SPECIFICATIONS HI 8520
Range pH 0.00 to 14.00
°C 0.0 to 100.0
Resolution pH 0.01
°C 0.1
Accuracy pH ±0.01
(@20°C / 68°F) °C ±0.4
Typical EMC pH ±0.02
Deviation °C ±0.4
Calibration Automatic 2 points with auto-buffer
recogntion
Temperature Automatic or Manual
Compensation From 0 to 100°C (32 to 212°F)
Electrode HI 1332B plastic body, combination,
double junction refillable
pH electrode (included)
Temperature Probe HI 7669/2W temp. probe (included)
Input Impedance 1012 ohm
Power 12VDC power
Environment 0 to 50°C (32 to 122°F); 95% RH
Dimensions 230x170x70 mm (9.1x6.7x2.7")
Shipping Weight 1.35 Kg (3 lb.)

12
COMBINED
pH or ORP
ELECTRODES
REFERENCE
ELECTRODE RESET
TEMPERATURE
PROBE
123 45
DC POWER
12V to 20V
+
RANGE
OFF
Temperature Buffer Values (pH)
°C
°F 4.01 7.01 10.01
0
10
20
30
40
32
50
68
86
104
4.01
4.00
4.00
4.02
4.04
7.13
7.07
7.03
7.00
6.98
10.32
10.18
10.06
9.96
9.88
CON
ERROR SYMBOLS
°C
CAL ON
E1: pH out of range
E2: °C out of range
E3: mV out of range
E4: wrong pH 7
E5: wrong pH 4/10
FUNCTIONAL DESCRIPTION &
SPECIFICATIONS OF HI8521
THE FRONT PANEL OF HI8521
ON / OFF To switch instrument ON and OFF.
RANGE To display pH / ORP / Temperature measurements.
CAL/CON CAL to enter the calibration procedure and CON to
confirm calibration data.
/ For setting temperature for manual compensation.
THE REAR PANEL OF HI8521
1. BNC socket for pH or ORP electrode.
2. Reference Jack socket for reference electrode.
3. RESET button.
4. Temperature Probe socket (for HI7669/2W).
5. DC Power Socket (for HI710005 or HI710006).
Electrode and probes connections
For combination pH or ORP electrodes (with internal reference) plug
the electrode's BNC to the socket provided (#1).
For an electrode with a separate reference, connect the measuring
electrode's BNC to the BNC socket and the reference electrode's jack
to the socket provided (#2).
For temperature measurements and automatic temperature com-
pensation connect the temperature probe to the °C socket (#4).
RESET button
The RESET button (#3) is used when the instrument displays errone-
ous messages due to strong electrical interference or when the

13
instrument's power supply is disconnected before the meter is switched
off. Press the RESET button and restart the entire operation.
Power connection
Plug the 12VDC adapter (HI710005 or HI710006) into the socket on
the back of the meter (#5).
Note: Make sure your main line is protected by a fuse.
Note: HI8521 uses a rechargeable battery to retain the pH calibra-
tion data. It lasts approximately one month when fully charged.
The battery is automatically charged any time the meter is
plugged-in (either turned on or off).
SPECIFICATIONS HI 8521
Range pH 0.00 to 14.00
ISE 0.0 to ±399.9mV
ORP 0 to ±1999mV
°C 0.0 to 100.0
Resolution pH 0.01
ISE 0.1mV
ORP 1mV
°C 0.1
Accuracy pH ±0.01
(@20°C / 68°F) ISE ±0.2mV
ORP ±0.1mV
°C ±0.4
Typical EMC pH ±0.05
Deviation ISE/ORP ±4mV
°C ±0.1
Calibration Automatic 2 points with auto-buffer
recogntion
Temperature Automatic or Manual
Compensation From 0 to 100°C (32 to 212°F)
Electrode HI 1332B plastic body, combination,
double junction refillable
pH electrode (included)
Temperature Probe HI 7669/2W temp. probe (included)
Input Impedance 1012 ohm
Power 12VDC power
Environment 0 to 50°C (32 to 122°F); 95% RH
Dimensions 230x170x70 mm (9.1x6.7x2.7")
Shipping Weight 1.4 Kg (3.1 lb.)

14
OPERATIONAL GUIDE
TAKING PH MEASUREMENTS
Connect the instrument to the 12VDC adapter (HI710005 or
HI710006). Plug the adapter into the mains.
Make sure that the instrument has been calibrated for pH before
taking pH measurements (see page 18).
For HI8519 only:
• Connect the pH electrode to the meter and switch
the instrument on by pressing the ON/OFF key.
• Immerse the electrode tip (4 cm/1½") into the sample and shake
briefly.
• Take the temperature of the solution with a
ChecktempC or a glass thermometer (e.g.25°C).
• Press the °C key to display temperature settings on
the LCD.
• Adjust the Temperature °C knob to display the
temperature of the sample.
• Press the pH key to display the pH measurement.
• The display shows the pH value of the test solution
compensated for temperature.
For HI8417, HI8520, HI8521 only:
• Connect the electrode and the temperature
probe (if automatic temperature compensa-
tion is desired).
• Press the ON/OFF key to turn the meter on. The
meter will automatically default to the pH measure-
ment mode.
• Immerse the electrode and the temperature probe
in the sample and shake briefly. Wait for 30 sec-
onds before taking readings.
• The display shows the pH reading compensated for
temperature.
ON
OFF
°C
°C
pH
pH
°C
ON
OFF

15
4 cm
(1½")
°C pH
• In HI8417 the temperature reading is also displayed on the left
LCD.
Note: the electrode should be submerged approximately 4 cm (1½")
into the solution. If the temperature probe is used, it should
be located as close to the pH electrode as possible.
If measurements are taken in different samples successively, it is
recommended that the electrode is rinsed thoroughly for better condi-
tioning and to eliminate cross-contamination of the sample.
For the rinsing process, it is recommended to use a liberal amount of
the next solution to be measured.
Using refillable electrodes
Unscrew the small refill cap to open the refill hole during measure-
ments. After measurement replace the refill hole cap.
MANUAL TEMPERATURE COMPENSATION FOR HI8417,
HI8520 AND HI8521
• When the temperature probe is not connected,
take the temperature of the solution with a
ChecktempC or a glass thermometer.
• Press the RANGE key to enter the temperature mode
(not necessary for HI8417). RANGE
°C
°C

16
• When the temperature is set manually,
"°C" symbol blinks. With the tempera-
ture probe connected, the "°C" symbol
is displayed continuously.
• Use the UP or DOWN arrow keys to
manually adjust the display reading
to the value of the reference ther-
mometer.
TAKING TEMPERATURE MEASUREMENTS (NOT FOR HI
8519)
• Taking a temperature measurement is very easy.
• Turn the instrument ON and press the RANGE key
(for HI8520 and HI8521 only) to get into tem-
perature mode.
• Make sure the temperature probe is connected
and allow the reading to stabilize (1 or 2 min-
utes).
• The temperature value will be dis-
played on the left LCD for HI8417.
TAKING ORP MEASUREMENTS
HI8417, HI8519 and HI8521 have the capability to take ORP
measurements, using an ORP electrode. Hanna Instruments offers a
variety of ORP electrodes for this purpose (see page 35). Contact your
Dealer for more information.
Just as pH measurements allow the acidity or the alkalinity of a
substance to be expressed in numbers, oxidation-reduction potential
(redox) measurements provide the quantification of the oxidizing or
reducing power of any liquid.
For HI8519 only:
• Connect the ORP electrode to the meter and
submerge the tip (4 cm / 1½") into the sample
to be tested.
Note: ORP measurements are taken without tem-
perature compensation.
• Press the mV key to enter the mV mode. Allow a few
minutes for the reading to stabilize.
• The display will indicate the absolute
mV value (positive or negative).
°C °C
RANGE
°C pH
4 cm
(1½")
mVmV
mV
ºC

17
For HI8417 and HI8521
• Connect the ORP electrode to the meter and submerge the tip (4
cm / 1½") into the sample to be tested.
Note: ORP measurements are taken without temperature compensa-
tion.
• Press the pH/mV key (HI8417) or
RANGE key (HI8521) once to enter
the mV mode.
• Allow a few minutes for the reading to
stabilize.
• The display will indicate the absolute
mV value (positive or negative).
• When values are less than ±400 mV, tenths of mV are dis-
played; for values greater than ±400 mV, the decimal digit
disappears. Note that the change in scale (from 0.1mV to 1mV
resolution) is automatic. "Err2" for HI8417 or "E3" for HI8521
appears if the value exceeds ±1999 mV (out of range).
AFTER MEASUREMENTS
• Press the ON/OFF key again to switch the instru-
ment OFF.
mV
RANGE pHpH
mVmV
ON
OFF

18
IMPORTANT
The instrument's pH range should be re-calibrated:
• When the meter is new.
• Whenever the pH electrode is replaced.
• At least once a month.
• After use in aggressive chemicals.
• After cleaning procedure and changing the reference electrolyte.
• For greatest accuracy.
INITIAL PREPARATION
Pour small quantities (up to 4cm / 1½" level)
of pH 7.01 (HI7007 or HI8007) and pH4.01
(HI7004 or HI8004) or pH 10.01 (HI7010
or HI8010) solution into clean beakers. If
possible use plastic beakers to minimize any
EMC interferences.
If you are measuring in the acid range use pH4.01 as second buffer
or pH 10.01 if you are measuring in the alkaline range.
Note: with HI8417 HI7006/HI8006 (pH 6.86) and HI7009/HI8009
(pH 9.18) can be used in place of HI7007/HI8007 (pH 7.01)
and HI7010/HI8010 (pH 10.01) respectively.
For accurate calibration, use two bea-
kers for each buffer solution; the first
for rinsing the electrode, the second
for calibration. In this way, contami-
nation of the buffer is minimized.
Note: the electrode should be submerged approxi-
mately 4 cm (1½") into the solution. If the
temperature probe is used, it should be posi-
tioned as close to the pH electrode as possible.
PH CALIBRATION FOR HI8417
HI8417 provides 6 pre-programmed calibration buffers: three NBS
buffers (d1, d2, d3 i.e. pH 6.86, 4.01, 9.18 respectively) and three
technical buffers (t1, t2, t3 i.e. pH 7.01, 4.01, 10.01 respectively).
When the ATC probe is not used, make sure the temperature is set
manually to reflect the temperature of the solution (see page 23).
HI 7007
RINSE
HI 7007
CALIBRATION
4 cm
(1½")
PH CALIBRATION
HI 7004 HI 7007
HI 7004

19
Procedure:
• Switch the instrument on after connecting the
pH electrode and the temperature probe.
• Immerse the pH electrode and the ATC probe
into a neutral pH buffer solution (pH 7.01
for technical buffers, or pH 6.86 for NBS
buffers).
Shake briefly and wait 1-2 minutes for thermal
equilibrium.
• Press the CAL key. The symbol "d1" will appear
on the display. For calibration with technical
buffers (pH 7.01), press CAL key again
and "t1" will appear on the display.
(Note: the "pH" symbol will be flashing
throughout the calibration procedure).
• Press the CON key. The buffer value will be
displayed on the right LCD.
• Allow 1-2 minutes for the pH reading to stabi-
lize.
The pH reading will be temperature compensated.
E.g. if the buffer temperature is at 25°C, the right display will
show "pH 7.01". If the buffer temperature is at 20°C, the display
will show "pH 7.03" (see page 23).
If "Err4" appears the calibration solution is wrong.
Repeat the process using fresh buffers.
Note: If you are not using the ATC probe, refer to page 22 to
manually correct for temperature.
• Press the CON key again to accept the buffer value.
The first point calibration is now complete.
• If the pH/mV key is pressed at this point, the cali-
bration process is ended and only the offset of the meter is
calibrated. This is known as one point calibration. For greatest
accuracy, however, it is recommended that a two-point calibra-
tion is performed.
• Rinse the electrode and the temperature probe before immersing
them into pH 4.01/ pH10.01 (or 9.18) calibration buffer, shake
briefly and wait for thermal equilibrium.
°C
pH
CON
ON
CAL
CON

20
• The meter automatically recognizes the buffer value and prompts
for the second at "d2" or "t2" (= pH 4.01, acid) or "d3" or "t3"
(pH 9.18 and pH10.01 respectively, alkaline).
• Press the CON key to confirm the pH value.
• The display will indicate the temperature compen-
sated buffer value e.g. if the temperature is at 25°C, the display
will show "pH 4.01" or "10.01" or "pH 9.18", depending on the
solution being used. If the temperature is at 20°C, the display
will show respectively "pH 4.00" or "pH 10.06" or "pH 9.22" (see
page 23).
• Press CON key again to confirm calibration. The
meter is now calibrated.
• The pH symbol will stop flashing and the unit is
ready for measurements.
• If the reading is drifting, turn the meter off and repeat the
calibration procedure waiting longer for the reading to stabilize.
However, usually 1 or 2 minutes is enough time to prevent a
drifting reading.
Note: If you need to unplug the instrument, press the OFF key thus
switching the instrument off before disconnecting the power
cord. In this way the instrument will retain the calibration
data. Otherwise, re-calibration might be necessary. In the case
of a power failure while the instrument is operational, re-
calibration might be required.
PH CALIBRATION FOR HI8519
Note: If you need to calibrate to NBS standards, use pH 6.86
(HI7006 or HI8006) and pH 9.18 (HI7009 or HI8009) in-
stead of pH7.01 and 10.01 respectively.
Use a ChecktempC or a glass thermometer with an resolution of 0.1°
as reference thermometer.
CON
CON
°C
pH