Hanna Instruments HI 9023C User manual

Instruction Manual
HI 9023C - HI 9023CN
HI 9024C - HI 9025C
HI 9110 - HI 9210
HI 9210N
Portable Waterproof
pH Meters
Manufacturers since 1978 These Instruments are in
Compliance with the CE Directives
MANPHWPR3
09/04
PRINTED IN CANADA

2
PRELIMINARY EXAMINATION........................................................ 3
GENERAL DESCRIPTION ............................................................... 3
FUNCTIONAL DESCRIPTION HI 9023C & HI 9023CN ..................... 5
SPECIFICATIONS HI 9023C & HI 9023CN ..................................... 6
FUNCTIONAL DESCRIPTION HI 9024C & HI 9025C ........................ 7
SPECIFICATIONS HI 9024C & HI 9025C ....................................... 8
FUNCTIONAL DESCRIPTION HI 9110 ............................................ 9
FUNCTIONAL DESCRIPTION HI 9210 & HI 9210N ....................... 10
SPECIFICATIONS HI 9110, HI 9210 & 9210N ............................ 11
OPERATIONAL GUIDE ................................................................ 12
pH CALIBRATION....................................................................... 16
pH VALUES AT VARIOUS TEMPERATURES ................................... 24
TROUBLESHOOTING GUIDE ........................................................ 25
ELECTRODE CONDITIONING AND MAINTENANCE.......................... 26
TAKING REDOX MEASUREMENTS (HI 9023C & HI 9025C only) .... 29
BATTERY REPLACEMENT & AUTO-OFF ......................................... 30
ACCESSORIES ........................................................................... 31
ELECTRODE APPLICATION REFERENCE GUIDE .............................. 37
WARRANTY ............................................................................... 38
CE DECLARATION OF CONFORMITY ............................................. 39
Dear Customer,
Thank you for choosing a Hanna Product. Please read this instruction
manual carefully before using the instrument. It will provide you with
the necessary information for a correct use of the instrument, as well
as a precise idea of its versatility. If you require further technical
information, do not hesitate to e-mail us at [email protected].
These instruments are in compliance with the directives EN 50081-1
and EN 50082-1.
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTS
39
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 interference to radio and TV equipment,
requiring the operator to take all necessary steps to correct interference.
The glass bulb at the end of the electrode is sensitive to electrostatic discharges. Avoid touching this glass bulb at all
times.
During calibration of instruments, ESD wrist straps should be worn to avoid possible damage to the electrode by
electrostatic discharge.
To maintain the EMC performance of equipment, the recommended cables noted in the user's manual must be used.
In particular cases the instruments could turn off. In such cases, turn them on by pressing the ON/OFF key.
Any variation introduced by the user to the supplied equipment may degrade the instruments' EMC performance.
Toavoidelectricalshock,donotusetheseinstrumentswhenvoltagesatthemeasurementsurfaceexceed24VACor60VDC.
To avoid damage or burns, do not perform any measurement in microwave ovens.
CE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITY
CE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITY
CE DECLARATION OF CONFORMITY

3
These waterproof Hanna instruments are heavy-duty pH meters de-
signed to provide laboratory results and accuracy under harsh industrial
conditions.
HI 9023C, pH/mV/°C meter utilizes an advanced customized micro-
processor. The meter has three memorized buffer values (4.01, 7.01
and 10.01) and automatic buffer recognition to avoid errors during
calibration. There are no trimmers, making calibration an easy pro-
cess, even for non-technical personnel. Temperature effects are
automatically compensated for, or can be manually adjusted. With
HI 9023CHI 9023C
HI 9023CHI 9023C
HI 9023C you can also measure ORP (Oxidation Reduction Potential)
or Ion Specific. Millivolt measurements automatically switch from 0.1
to 1 mV resolution when the reading reaches 400mV.
HI 9023C is supplied with HI 1230B combination double-junction gel
pH electrode, HI 7669/2W temperature probe, pH 4.01 and 7.01 (20
mL each) buffer solutions, sample vessel, 1.5V AA size batteries (4
each) and a rugged carrying case.
HI 9023CN, pH/mV/°C meter utilizes an advanced customized
microprocessor. The meter has three memorized buffer values (4.01,
7.01 and 10.01) and automatic buffer recognition to avoid errors
during calibration. Temperature effects are automatically compen-
sated for.
HI 9023CN is supplied with HI 1217D 4-in-1 amplified, gel pH/°C
electrode, pH 4.01 and 7.01 (20 mL each) buffer solutions, sample
vessel, 1.5V AA size batteries (4 each) and a rugged carrying case.
HI 9024C and HI 9025C are pH/°C meters with a built-in micropro-
cessor. A large dual-level LCD displays the pH and temperature
simultaneously. The display has graphic symbols to make the calibra-
tion procedure easy to follow. The meters have 5 memorized buffer
Remove the instrument from the packing material and examine it
carefully to make sure that no damage has occurred during shipping.
If there is any noticeable damage, notify your Dealer immediately.
Note: Save all packing materials until you are sure that the instru-
ment functions correctly. Any damaged or defective item must
be returned in its original packing materials together with the
supplied accessories.
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION
38
WARRANTYWARRANTY
WARRANTYWARRANTY
WARRANTY
All Hanna Instruments meters are guaranteed for two years
against defects in workmanship and materials when used for their
intended purpose and maintained according to instructions. The
electrodes and the probes are guaranteed for a period of six
months. This warranty is limited to repair or replacement free of
charge.
Damage 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 shipping 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 Inc.
Hanna Instruments reserves the right to modify the design, con-
struction and appearance of its products without advance notice.

4
values (4.01, 6.86, 7.01, 9.18 and 10.01), buffer recognition to
avoid errors during calibration and automatic temperature compensa-
tion. You can use HI 9025C with ORP (Oxidation Reduction Potential)
or Ion Specific Electrodes. Millivolt measurements automatically switch
from 0.1 to 1 mV resolution when the reading reaches 400 mV. To
insure trouble-free operation, the meter's circuitry comes with built-in
protection against electromagnetic interference.
HI 9024C and HI 9025C are supplied with HI 1230B combination
double-junction, gel pH electrode, HI 7669/2W temperature probe,
pH 4.01 and 7.01 (20 mL each) buffer solutions, sample vessel, 1.5V
AA size batteries (4 each) and a rugged carrying case.
HI 9110, pH meter, has simple manual temperature compensation
and calibration which make this meter easy to use in laboratory and
field. The calibration trimmers are sealed behind a protective cover so
that they cannot be accidentally moved or readjusted by unauthorized
persons.
HI 9110 is supplied with FC 100B combination double-junction,
refillable pH electrode, calibration screwdriver, 1.5V AA size batteries
(4 each) and a soft carrying case.
HI 9210 pH meter has simple manual temperature compensation
and calibration with only two buttons, making it simple to use for
even non-technical personnel. The calibration trimmers are sealed
behind a protective cover so that they cannot be accidentally moved or
readjusted by unauthorized persons.
HI 9210 is supplied with HI 1230B combination double-junction, gel
pH electrode, calibration screwdriver and 1.5V AA size batteries (4
each).
HI 9210N pH/°C meter measures both pH and temperature. It has
only two buttons, making it simple to use for even non-technical
personnel. The calibration trimmers are sealed behind a protective
cover so that they cannot be accidentally moved or readjusted by
unauthorized persons.
HI 9210N is supplied with HI 1217D 4-in-1, gel, amplified pH/°C
electrode, calibration screwdriver and 1.5V AA size batteries (4 each).
37
Application Electrodes*
1. Aquarium HI 1332B
2. Bath-water HI 1130B
3. Beer HI 1131B
4. Bread HI 2031B, FC 200B
5. Cheese FC 200B
6. Dairyproducts FC 100B
7. Dirtywater HI 1230B
8. Emulsions HI 1053B
9. Environment HI 1230B
10. Flasks HI 1331B
11. Food industry general use FC 911B, FC 100B
12. Fruit FC 200B, FC 220B
13. Fruit juices, organic FC 210B
14. Galvanizing waste solution HI 1130B
15. Heavy-duty applications HI 1135B
16. High purity water HI 1053B
17. Horticulture HI 1053B, FC 200B
18. Laboratorygeneral use HI 1131B, HI 1230B, HI 1332B, HI 1330B
19. Leather HI 1413B
20. Lemon juice FC 100B
21. Meat FC 200B, HI 2031B
22. Micro plate sampling of less than HI1083B
100 mL
23. Milk and Yogurt FC 210B
24. Paints HI 1053B
25. Paper HI 1413B
26. Photographic chemicals HI 1230B
27. Quality control HI 1332B
28. Sausages FC 200B, HI 2031B
29. Semisolid products HI 2031B
30. Skin HI 1413B
31. Soil samples HI 1230B
32. Solvents HI 1043B
33. Strongacid HI 1043B
34. Submersion application HI 1130B
35. Surface measurements HI 1413B
36. Swimming pool H I1130B, HI 2114P/2
37. Titrations with constant HI 1131B
temperaturerange
38. Titrationswith wide temperature HI 1131B
range
39. Very high humidity FC 911B
40. Vials and test tube HI 1330B
41. Wine processing FC 220B
ELECTRODE APPLICATIONELECTRODE APPLICATION
ELECTRODE APPLICATIONELECTRODE APPLICATION
ELECTRODE APPLICATION
REFERENCE GUIDEREFERENCE GUIDE
REFERENCE GUIDEREFERENCE GUIDE
REFERENCE GUIDE
* All electrode listed are supplied with 1m (3") cable and BNC
connector.

5
1) Electrode connector (BNC for HI 9023C and DIN for HI 9023CN)
2) Temperature probe socket (HI 9023C only)
3) Liquid Crystal Display
4) CAL key to enter or exit calibration mode
5) CFM key to confirm calibration
6) Ï°C and аC°C
°C°C
°C keys for manual temperature setting
(HI 9023C only)
7) ON/OFF key to turn the instrument on or off
8) RANGE key to select pH, °C or mV
9) Low battery indicator (additional decimal point)
10) Mode indicator
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION
HH
HH
HII
II
I9023C & HI 9023CN9023C & HI 9023CN
9023C & HI 9023CN9023C & HI 9023CN
9023C & HI 9023CN
36
ORP electrodes:
HI 3131B
Glass-body, refillable, combination platinum ORP electrode.
Use: titration.
HI 3230B
Plastic-body (Ultem®), gel-filled, combination platinum ORP elec-
trode. Use: general purpose.
HI 4430B
Plastic-body (Ultem®), gel-filled, combination gold ORP electrode.
Use: general purpose.
150 mm
5.9"
12 mm
0.5"
"S" VERSION
HI 3131
120 mm
4.7"
12 mm
0.5"
HI 3230
"S" VERSION
120 mm
4.7"
12 mm
0.5"
HI 4430
"S" VERSION
Consult the Hanna General Catalog for an extensive selection of
electrodes.
OTHER ACCESSORIES
ChecktempC Pocket-size thermometer (range -50.0 to 150.0°C)
HI 76405 Electrode holder
HI 7669/2W Temperature probe with 1 m (3.3') screened cable
(not HI 9110, HI 9210, HI 9210N and HI 9023CN)
HI 8427 pH and ORP electrode simulator with 1 m (3.3') coaxial
cable ending in female BNC connectors
HI 931001 pH and ORP electrode simulator with LCD and 1 m
(3.3') coaxial cable ending in female BNC connectors
HI 721317 Rugged carrying case

6
SPECIFICATIONS HSPECIFICATIONS H
SPECIFICATIONS HSPECIFICATIONS H
SPECIFICATIONS HII
II
I9023C9023C
9023C9023C
9023C
& HI 9023CN& HI 9023CN
& HI 9023CN& HI 9023CN
& HI 9023CN
HI 9023C HI 9023CN
Range 0.00 to 14.00 pH
±399.9 mV (ISE); ±1999 mV (ORP)
0.0 to 100.0°C 0.0 to 70.0°C
Resolution 0.01 pH
0.1 mV (ISE); 1 mV (ORP)
0.1°C
Accuracy ±0.01 pH
(@20°C/68°F) ±0.2 mV (ISE); ±1 mV (ORP)
±0.4°C ±0.5°C
Typical EMC ±0.02 pH
Deviation ±0.2 mV; ±1 mV
±0.2°C ±0.5°C
Calibration Automatic with 3 memorized standard
buffers (4.01, 7.01, 10.01)
Temperature Automatic or manual Automatic
Compensation 0 to 100°C (32-212°F) 0 to 70°C (32-158°F)
Electrode HI1230B plastic body, HI1217D plastic body,
combination pH, BNC 4-in-1 gel pH/°C, DIN
1 m cable (included) 1 m cable (included)
Temperature Probe HI 7669/2W (incl.) not necessary
Input Impedance 1012 Ohm
Battery Type & Life 4x1.5V, AA size (alkaline batteries)
approx. 400 hours of continuous use
auto-shut off after 10 minutes of non-use
Environment 0 to 50°C (32 to 122°F); 100% RH
Dimensions 196x80x60 mm (7.7x3.1x2.4") (meter)
340x230x80 mm (13.8x9x3.1") (kit)
Weight 425 g (15 oz.) (meter)
1.3 Kg (3.0 lb.) (kit)
35
120 mm
4.7"
12 mm
0.5"
FC 210
120 mm
4.7"
12 mm
0.5"
9.5mm DIA
0.37"
FC 220
FC 210B
Glass-body, double junction, conic, Viscolene, non-refillable, combina-
tion pH electrode. Use: milk, yogurt.
FC 220B
Glass-body, triple-ceramic, single junction, refillable, combination pH
electrode. Use: food processing.
FC 911B
Plastic-body (Kynar®), double junction, refillable with built-in ampli-
fier, combination pH electrode. Use: very high humidity.
HI 1413B
Glass-body, single junction, flat tip, Viscolene, non-refillable, combi-
nation pH electrode. Use: surface measurement.
110 mm
4.3"
12 mm
0.5"
FC 911
110 mm
4.3"
12 mm
0.5"
HI 1413
Kynar®is registered Trademark of "Pennwalt Corp."
Ultem®is registered Trademark of "General Electrics Co."

7
1) BNC electrode connector
2) Temperature probe socket
3) Liquid Cristal Display
4) RANGE key to select pH or mV (HI 9025C only)
5) ON/OFF key to turn the meter on or off
6) CAL key to enter or exit calibration mode
7) CFM key to confirm calibration
8) Ï°C and аC°C
°C°C
°C keys for manual temperature setting, or
selecting pH buffer value
9) MEM key to store pH value in memory
10) MR key to recall the stored value from memory
11) User-friendly graphic symbols
12) Primary display
13) Secondary display
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION
HH
HH
HII
II
I9024C & H9024C & H
9024C & H9024C & H
9024C & HII
II
I9025C9025C
9025C9025C
9025C
34
HI 2031B
Glass-body, semimicro, conic, refillable, combination pH electrode.
Use: semisolid products.
HI 1332B
Plastic-body (Ultem®), double junction, refillable, combination pH
electrode. Use: general purpose.
75 mm
2.95"
6 mm
0.25"
"S" VERSION
HI 2031
120 mm
4.7"
12 mm
0.5"
"S" VERSION
HI 1332
FC 100B
Plastic-body (Kynar®), double junction, refillable, combination pH
electrode. Use: general purpose for food industry.
FC 200B
Plastic-body (Kynar®), open junction, conic, Viscolene, non-refillable,
combination pH electrode. Use: meat & cheese.
120 mm
4.7"
12 mm
0.5"
FC 100
75 mm
2.95"
6 mm
0.25"
FC 200

8
SPECIFICATIONS HI 9024C & HI 9025CSPECIFICATIONS HI 9024C & HI 9025C
SPECIFICATIONS HI 9024C & HI 9025CSPECIFICATIONS HI 9024C & HI 9025C
SPECIFICATIONS HI 9024C & HI 9025C
HI 9024C HI 9025C
Range 0.00 to 14.00 pH; 0.0 to 100.0°C
— 0.0/±399.9 mV (ISE)
— ± 400/ ± 1999mV (ORP)
Resolution 0.01 pH; 0.1°C
— 0.1 mV (ISE)
— 1 mV (ORP)
Accuracy ±0.01 pH; ±0.5°C
(@20°C/68°F) — ±0.2 mV (ISE)
Typical EMC ±0.01 pH; ±0.1°C
Deviation — ±0.3 mV (ISE)
Calibration Automatic with 5 memorized standard
buffers (4.01, 6.86, 7.01, 9.18, 10.01)
Offset Calibration ±1 pH
Slope Calibration From 70 to 108%
Temperature Automatic or manual from 0 to 100°C
Compensation (32 to 212°F)
Electrode HI 1230B pH electrode (included)
Temperature Probe HI 7669/2W (included)
Input Impedance 1012 Ohm
Battery Type & Life 4x1.5V, AA size (alkaline batteries)
approx. 400 hours of continuous use
auto-shut off after 10 minutes of non-use
Environment 0 to 50°C (32 to 122°F); 100% RH
Dimensions meter: 196x80x60 mm (7.7x3.1x2.4")
kit: 340x230x80 mm (13.8x9x3.1")
Weight meter: 425 g (15 oz.)
kit: 1.3 Kg (3.0 lb.)
33
HI 1083B
Glass-body, micro, Viscolene, non-refillable, combination pH elec-
trode. Use: biotechnology, micro titration.
HI 1131B
Glass-body, single junction, refillable, combination pH electrode.
Use: general purpose.
120 mm
4.7"
12 mm
0.5" 5 mm
0.2" 3 mm
0.12" 3.0 mm DI
A
0.12"
HI 1083
120 mm
4.7"
12 mm
0.5"
9.5mm DIA
0.37"
"S" VERSION
HI 1131
HI 1330B
Glass-body, semimicro, single junction, refillable, combination pH
electrode. Use: laboratory, vials.
HI 1331B
Glass-body, semimicro, single junction, refillable, combination pH
electrode. Use: flasks.
HI 1230B
Plastic-body (Ultem®), double junction, gel-filled, combination pH
electrode. Use: general, field.
120 mm
4.7"
5mm
0.2"
5mm DIA
0.2"
"S" VERSION
HI 1330
210 mm
8.25"
8 mm
0.3" 7.5mm DIA
0.29"
"S" VERSION
HI 1331
120 mm
4.7"
12 mm
0.5"
"S" VERSION
HI 1230

9
1) Battery cover
2) BNC electrode connector
3) Offset calibration trimmer
4) Slope calibration trimmer
5) Temperature setting trimmer
6) Mode indicator
7) Liquid Crystal Display
8) ON/OFF key to turn the meter on or off
9) pH/°C SET key to select pH measurement or for manual
temperature setting
RANGE
0.00 TO 14.00 pH
ACCURACY
±0.02pH
pH METER
pH
pH
°C
SET
HI 9110
67
8
9
2
13
4
5
Foodcare
ON
OFF
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION HH
HH
HII
II
I91109110
91109110
9110
32
REFILL ELECTROLYTE SOLUTIONS IN FDA APPROVED
BOTTLES
HI 8071 3.5M KCl + AgCl Electrolyte, 4x50mL, for single junc-
tion electrodes
HI 8072 1M KNO3Electrolyte, 4x50 mL
HI 8082 3.5M KCl Electrolyte, 4x50 mL, for double junction
electrodes
ORP PRETREATMENT SOLUTIONS
HI 7091L Reducing Pretreatment Solution, 460 mL
HI 7092L Oxidizing Pretreatment Solution, 460 mL
pH & ORP ELECTRODES
All electrodes part numbers ending in B are supplied with a BNC
connector and 1 m (3.3') cable, as shown below:
HI 1043B
Glass-body, double junction, refillable, combination pH electrode.
Use: strong acid/alkali.
HI 1053B
Glass-body, triple ceramic, conic shape, refillable, combination pH
electrode. Use: emulsions.
120 mm
4.7"
12 mm
0.5"
9.5mm DIA
0.37"
"S" VERSION
HI 1043
120 mm
4.7"
12 mm
0.5"
"S" VERSION
HI 1053

10
1) Battery cover
2) Electrode connector (BNC for HI 9210 and DIN for HI 9210N)
3) Offset calibration trimmer
4) Slope calibration trimmer
5) Temperature setting trimmer (HI 9210) or Temperature
Calibration (HI 9210N)
6) Mode indicator
7) Liquid Crystal Display
8) ON/OFF key to turn the meter on or off
9) RANGE key to visualize the temperature (HI 9210N) or for
manual temperature setting (HI 9210)
HI 9210N
ATC
pH METER
ON/OFF
RANGE
RANGE
pH:
°C: 0.00 - 14.00 0.0 -70.0
pH
67
8
9
2
13
4
5
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION
HH
HH
HII
II
I9210 & HI 9210N9210 & HI 9210N
9210 & HI 9210N9210 & HI 9210N
9210 & HI 9210N
31
ACCESSORIESACCESSORIES
ACCESSORIESACCESSORIES
ACCESSORIES
pH CALIBRATION SOLUTIONS
HI 70004P pH 4.01 Buffer Sachets, 20mL, 25 pcs
HI 70007P pH 7.01 Buffer Sachets, 20mL, 25 pcs
HI 70010P pH 10.01 Buffer Sachets, 20mL, 25 pcs
HI 7004L pH 4.01 Buffer Solution, 460 mL
HI 7006L pH 6.86 Buffer Solution, 460 mL
HI 7007L pH 7.01 Buffer Solution, 460 mL
HI 7009L pH 9.18 Buffer Solution, 460 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 SOLUTION
HI 70300L Storage Solution, 460 mL
HI 80300L Storage Solution in a FDA approved bottle, 460 mL
ELECTRODE CLEANING SOLUTIONS
HI 70000P Electrode Rinse Sachets, 20 mL, 25 pcs
HI 7061L General Cleaning Sol., 460 mL
HI 7073L Protein Cleaning Sol., 460mL
HI 7074L Inorganic Cleaning Sol., 460mL
HI 7077L Oil & Fat Cleaning Sol.,460 mL
ELECTRODE CLEANING SOLUTIONS IN FDA
APPROVED BOTTLES
HI 8061L General Cleaning Solution, 460 mL
HI 8073L Protein Cleaning Solution, 230 mL
HI 8077L Oil & Fat Cleaning Solution, 460mL
REFILL ELECTROLYTE SOLUTIONS
HI 7071 3.5M KCl + AgCl Electrolyte, 4x50mL, for single junc-
tion electrodes
HI 7072 1M KNO3Electrolyte, 4x50 mL
HI 7082 3.5M KCl Electrolyte, 4x50 mL, for double junction
electrodes

11
HI 9110 HI 9210 HI 9210N
Range pH 0.00 to 14.00 pH
°C — 0.0 to 70.0°C
Resolution pH 0.01 pH
°C — 0.1°C
Accuracy pH ±0.02 pH
(@20°C/68°F) °C — ±0.5°C
Typical EMC pH ±0.05 pH ±0.02 pH
Deviation °C — ±0.5°C
Calibration Manual 2 points through trimmers
Offset Calibration ±1 pH
Slope Calibration From 85 to 105% of nominal value
Temperature Manual 0 to 100°C Auto 0 to 70°C
Compensation (32 to 212°F) (32 to 158°F)
Electrode FC 100B HI 1230B HI 1217D
pH (incl.) pH (incl.) pH/°C (incl.)
Input Impedance 1012 Ohm
Battery Type 4x1.5 volt, AA size (alkaline batteries);
Life 2000 hours of continuous use
Environment 0 to 50°C (32 to 122°F); 100% RH
Dimensions 196 x 80 x 60 mm (7.7 x 3.1 x 2.4")
Weight 320 g (11.3 oz.)
SPECIFICATIONS HI 9110, HI 9210SPECIFICATIONS HI 9110, HI 9210
SPECIFICATIONS HI 9110, HI 9210SPECIFICATIONS HI 9110, HI 9210
SPECIFICATIONS HI 9110, HI 9210
& HI 9210N& HI 9210N
& HI 9210N& HI 9210N
& HI 9210N
30
If the batteries become weak:
-HI 9023C and HI 9023CN will display a
blinking additional decimal point.
-HI 9024C and HI 9025C will display "LOW
BAT".
-HI 9110, HI 9210 and HI 9210N will
display a "V" on the LCD. Note: HI 9110HI 9110
HI 9110HI 9110
HI 9110,
HI 9210HI 9210
HI 9210HI 9210
HI 9210 and HI 9210NHI 9210N
HI 9210NHI 9210N
HI 9210N are supplied with
the advanced "BEPS", Battery Error Preven-
tive System, that detects a low voltage condition in the battery.
The "V" symbol is to alert the user that the display will be shut-off
after about 5 hours of use. After that, the meter shuts down the
display, preventing the taking of erroneous measurements due to
low voltage.
Battery replacement must only take place in a
non hazardous area using the battery types speci-
fied in this instruction manual. To replace
rundown batteries, remove the two screws on
the rear cover of the instrument and replace all
four 1.5V AA batteries with new ones, while
paying attention to the correct polarity. Replace
the cover and tighten the two screws. The meter
is reset any time the batteries are removed. In
case of any functional problems, reset the meter
by removing and reinstalling the batteries.
pH
LOW BAT
V
BATTERY REPLACEMENT & AUTO-OFFBATTERY REPLACEMENT & AUTO-OFF
BATTERY REPLACEMENT & AUTO-OFFBATTERY REPLACEMENT & AUTO-OFF
BATTERY REPLACEMENT & AUTO-OFF

12
ON/OFF
ON/OFF
°C
°C
or
INITIAL PREPARATION
Each meter is supplied complete with batteries.
Remove the back cover, unwrap the batteries and
install them while paying attention to polarity.
HI 9023C, HI 9024C, HI 9025C:
To prepare the instrument for use connect the pH electrode and the
temperature probe to the BNC and temperature sockets on the top of
the instrument. 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 keys. To
switch the instrument on, press and hold the
ON/OFF key for a fraction of a second. The
meter has a built-in protection against electro-
magnetic interference and the delayed response
of the keys assures that the commands are not
mistaken for stray signals.
HI 9110 and HI 9210:
Connect the pH electrode to the BNC connector on the top of the
instrument and press the ON/OFF key.
HI 9210N and HI 9023CN:
Connect the pH/°C electrode to the DIN connector on the top of the
instrument and press the ON/OFF key.
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDE
ON/OFF
29
TAKING REDOX MEASUREMENTS
(HI 9023C & HI 9025C only)
HI 9023C and HI 9025C have the capability to take ORP measure-
ments. An optional ORP electrode must be used to perform these
measurements.
Oxidation-Reduction Potential (REDOX) measurements provide the quan-
tification 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.
In order to improve performance and obtain a faster response time,
precondition your ORP electrode with reducing or oxidizing solutions.
Generally speaking, if the ORP mV reading corresponding to the pH
value of the solution is higher than the values in the table below, an
oxidizing pretreatment is necessary; otherwise a reducing pretreatment
is necessary:
pH mV pH mV pH mV pH mV pH mV
0 990 1 920 2 860 3 800 4 740
5 680 6 640 7 580 8 520 9 460
10 400 11 340 12 280 13 220 14 160
Reducing pretreatment: immerse the electrode for a few minutes in
HI 7091.
Oxidizing pretreatment: immerse the electrode for a few minutes in
HI 7092.
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.

13
°C
RANGE
ON/OFF
°C
°C
or
pH MEASUREMENTS
To take a pH measurement remove the elec-
trode protective cap and simply submerge the
tip (4cm/1½") of the electrode and the tem-
perature probe (wherever applicable) into the
sample to be tested.
Turn the instrument ON and if necessary, press RANGE until the
display changes to the pH mode.
Allow for the electrode to adjust to the solution and stabilize.
In order to take more accurate pH measurements, make sure that the
instrument is calibrated (see page 16).
It is recommended that the electrode is always kept wet and rinsed
thoroughly with the sample to be measured before use.
The pH reading is directly affected by temperature. In order for the
meter to measure the pH accurately, temperature must be taken in
consideration. If the sample temperature is quite different from the
temperature at which the pH electrode was kept, allow a few minutes
for a perfect thermal equilibrium between them.
HI 9023C, HI 9024C and HI 9025C:
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 a couple of 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°C or the last recorded temperature read-
ing with the "°C" indicator blinking.
The temperature can now be adjusted with the
UP and DOWN keys.
4 cm
(1½")
28
CLEANING PROCEDURE
General Soak in Hanna HI 7061 or HI 8061 General Cleaning
Solution for approximately ½ 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 Clean-
ing Solution for 15 minutes.
- Oil/grease Rinse with Hanna HI 7077 or HI 8077 Oil and Fat
Cleaning Solution.
IMPORTANT: After performing any of the cleaning procedures rinse
the electrode thoroughly with distilled water, refill the reference cham-
ber 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 HI 70300 or HI 80300 Stor-
age Solution for at least 1 hour.
•Drifting: Soak the electrode tip in warm (approx. 50-60°C)
Hanna HI 7082 or HI 8082 Solutions for one hour and rinse the
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 (refillable electrodes only).
•Low Slope: Refer to the cleaning procedure 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 HI 7061 or
HI 8061 Solutions for 30 minutes, rinse thoroughly in distilled
water and then follow the Cleaning Procedure above.

14
°C
RANGE
pH
°C
SET
HI 9023C, HI 9023CN and HI 9210N
To use the meter's Automatic Temperature Compensation feature,
simply submerge the pH/°C electrode into the sample and wait for a
couple of minutes. The pH electrode also houses the temperature
sensor which will measure and adjust for the temperature effect
automatically.
HI 9110, HI 9210:
To use the meter’s Manual Temperature Compensation feature:
Press the pH/°C key of HI 9110 or the RANGE key of HI 9210 to
select the manual temperature mode.
Remove the protective cap on top of the meter
to access the trimmers. Measure the tempera-
ture of the buffer with a Checktemp or an
accurate thermometer.
Using the calibration screwdriver, turn the tem-
perature trimmer (#5 pages 9-10) to display
the measured temperature value.
Press the pH/°C key of HI 9110 or the RANGE key of HI 9210 to
return to the pH measurement mode.
When finished, switch the instrument off and rinse the electrode with
clean water. Pour a few drops of HI 70300 storage solution, or in its
absence, pH 7 or pH 4 buffers in the protective cap and replace it
before storing away the electrode.
RANGE
pH
°C
SET
27
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 WA-
TER.
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 elec-
trodes). Allow the electrode to stand upright for 1 hour.
Follow the Storage Procedure above.
AmpHel®is a registered Trademark of "Hanna Instruments"

15
ORP MEASUREMENTS (HI 9023C AND HI 9025C)
To enter the "mV" mode (ORP or ISE), turn the instrument ON and
press the RANGE key until the display changes to mV.
To measure the mV of a solution simply sub-
merge the ORP or ISE electrode tip (4cm/
1½") into the sample to be tested. Allow a
few minutes for the readings to stabilize. See
also "Taking REDOX Measurements" section at
page 29.
TEMPERATURE MEASUREMENTS (HI 9023C,
HI 9023CN, HI 9024C, HI 9025C AND HI 9210N):
Taking a temperature measurement is very easy. Turn the instrument
ON and press the RANGE key to enter temperature mode.
For HI 9023C, HI 9024C and HI 9025C, dip the liquid/general
purpose temperature probe HI 7669/2W into the sample. For
HI 9023CN and HI 9210N, simply dip the pH/°C electrode which
contains the temperature sensor. Then allow a couple of minutes for
the reading to stabilize.
Note: You can also calibrate the offset point of the HI 9210N tem-
perature sensor, if needed. For this purpose, immerse the pH/
°C electrode in a solution at a known temperature. Then turn
the #5 trimmer (see page 10) until the temperature dis-
played on the LCD is that of the solution.
ON/OFF
ON/OFF
4 cm
(1½")
RANGE
RANGE
26
ELECTRODE CONDITIONING &ELECTRODE CONDITIONING &
ELECTRODE CONDITIONING &ELECTRODE CONDITIONING &
ELECTRODE CONDITIONING &
MAINTENANCEMAINTENANCE
MAINTENANCEMAINTENANCE
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.
* Not present in gel electrodes.

16
It is recommended to calibrate the instrument frequently, especially if
high accuracy is required.
The instrument should be recalibrated for pH:
a) Whenever the pH electrode or temperature probe is replaced.
b) At least once a month.
c) After testing aggressive chemicals.
d) Whenever the batteries have been replaced.
e) If greater accuracy is required.
PREPARATION
Pour small quantities of pH 7.01 and pH 4.01 solution into two clean
beakers.
For accurate calibration use two beakers for each buffer solution, the
first one for rinsing the electrode and the second one for calibration.
This way contamination of buffer is minimized.
To obtain accurate readings, use pH 7.01 and pH 4.01 buffers if you
are going to measure acidic samples, or pH 7.01 and pH 10.01 for
alkaline measurements.
PROCEDURE FOR HI 9023C AND HI 9023CN:
• Make sure that the meter is in the pH mode.
• Remove the protective cap from the elec-
trode, rinse it with some pH 7.01 solution,
then immerse the pH electrode and tem-
perature probe (HI 9023CHI 9023C
HI 9023CHI 9023C
HI 9023C) or the pH/°C
electrode (HI 9023CNHI 9023CN
HI 9023CNHI 9023CN
HI 9023CN) into pH 7.01 buffer
solution and stir gently and wait for the
reading to stabilize.
HI 7004 HI 7007
HI 7004
HI 7007
CALIBRATION
HI 7007
RINSE
pp
pp
pH CALIBRATIONH CALIBRATION
H CALIBRATIONH CALIBRATION
H CALIBRATION
HI 7007
25
TROUBLESHOOTING GUIDETROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDETROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
The meter is slow in re-
sponding or gives faulty
readings
The meter does not ac-
cept the 2nd buffer
solution for calibration
The reading drifts
Display shows: "E1" or
Display shows: "E2" or
Display shows: "E3" or
Display shows: "E4" or
"WRONG BU
F
1 "
and/or
"WRONG "
Display shows: "E5" or
"WRONG BU
F
2
"
and/or
"WRONG "
The meter does not work
with the temperature
probe
The meter fails to cali-
brate or gives faulty
readings
Display acts erratically
The electrode is not work-
ing or the reference
junction is clogged
Out of order pH electrode
Out of order 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
Out of order electrode
Erroneous buffer solution
used for slope calibration
Out of order electrode
Out of order temperature
probe
Out of order pH electrode
The microprocessor has
been electronically dis-
turbed
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 pH 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 (or 70°C)
range and the 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 pH electrode
Make sure the buffer setting
is correct and the solution is
fresh. Replace the buffer if
necessary
Replace the pH electrode
Replace the probe
Replace the electrode
Remove one of the batteries
for one minute to reset the
microprocessor
Symptoms Problem Solution

17
CFM
Note: The electrode should be submerged ap-
proximately 4 cm (1½") into the solution.
With the temperature probe located as
close to it as possible (HI 9023CHI 9023C
HI 9023CHI 9023C
HI 9023C).
• Press the CAL key. The temperature compensated pH value will
blink on the display. For example, if the temperature is 25°C the
reading will be pH 7.01. If the temperature is 20°C the reading
will be 7.03. The pH/temperature conversion chart is on page 24.
Note: If "E4" flashes, the buffer solution is
wrong or the probe is defective (see
page 25 for troubleshooting).
• Wait for the "pH" symbol to stop flashing and press the CFM key.
The symbol "E5" will flash to indicate that the electrode is still in
the pH 7.01 buffer.
• Rinse the pH electrode (and the tempera-
ture probe) with distilled water first and
with the pH 4.01 (or 10.01) buffer after.
• Dip the electrode (and the temperature
probe) into the pH 4.01 (or 10.01) buffer
solution. Stir gently and wait for the read-
ing to stabilize.
• The "E5" symbol should disappear and the temperature compen-
sated value will blink on the display. For example, if you are
using pH 4.01 as the buffer, the reading will be 4.01 at 25°C.
• When the "pH" symbol stops flashing, press
CFM to confirm the calibration.
The instrument is now calibrated and will re-
main calibrated even when it is turned off.
Note: The meter will lose the calibration if the batteries are removed.
CAL
HI 7004
CFM
4 cm
(1½")
24
Temperature has an effect on pH. The calibration buffer solutions are
affected by temperature changes to a lesser degree than normal
solutions.
For manual temperature calibration (standard with HI 9110 and
HI 9210 or optional with HI 9023C, HI 9024C and HI 9025C)
please refer to the following chart.
For instance, if the buffer temperature is 25°C, the display should
show pH 4.01, 7.01 or 10.01 at pH 4, 7 or 10 buffers, respectively.
At 20°C, the display should show pH 4.00, 7.03 or 10.06. The meter
reading at 50°C will then be 4.06, 6.98 or 9.82.
pp
pp
pH VALUES AT VARIOUSH VALUES AT VARIOUS
H VALUES AT VARIOUSH VALUES AT VARIOUS
H VALUES AT VARIOUS
TEMPERATURESTEMPERATURES
TEMPERATURESTEMPERATURES
TEMPERATURES
TEMP pH VALUES
°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

18
°C
°C
or
°C
HI 7007
RANGE
ON/OFF
HI 9023C only:
To calibrate with manual temperature compensation, follow this
procedure:
• Disconnect the temperature probe and
switch the instrument ON.
• Press RANGE to select the temperature
mode.
• Place the pH electrode into the 7.01 buffer
stir gently and wait for the LCD to stabi-
lize.
• Record the buffer temperature by using a
Checktemp C or an accurate thermometer
(e.g. 18°C).
• Press the UP and DOWN to adjust the temperature accordingly.
• Press RANGE to display pH and then press the CAL key. The value
of the buffer will be displayed.
• Wait for the "pH" symbol to stop flashing.
• Press CFM. The "E5" symbol will flash to indicate that the elec-
trode is still in the 7.01 solution.
• Rinse the electrode with clean or distilled
water first and then with pH 4.01 (or
10.01) buffer. Dip the electrode into the
pH 4.01 (or 10.01) solution and stir gen-
tly.
RANGE CAL
and then
°C
CFM
HI 7004
23
• Rinse first with clean or distilled water
and then with a small amount of the next
buffer (2nd calibration point). Dip the elec-
trode into pH 4.01 (or 10.01) buffer, stir
gently and wait until the display has sta-
bilized.
• Adjust the SLOPE trimmer (#4 pages 9-10) until the LCD displays
the pH value at the second buffer temperature (see page 24).
• pH calibration is now complete. Once the calibration process is
complete, replace the trimmer cover and tighten it to ensure a
proper seal against water and humidity ingress.
pH
HI 7004

19
• Wait for the "pH" symbol to stop flashing. Press CFM to confirm
the calibration.
PROCEDURE FOR HI9024C AND HI9025C:
In order to calibrate HI 9024C and HI 9025C, there is a choice of 5
memorized buffers: 4.01, 6.86, 7.01, 9.18 and 10.01 pH.
• Make sure that the meter is in the pH mode.
• Remove the protective cap and rinse the electrode with some of
the buffer calibration solution that you are going to use first.
ONE-POINT CALIBRATION:
It is always recommended to perform a two-point calibration for
optimum accuracy. In case of necessity, it is possible to carry out only
a one-point calibration with the instruments. The offset buffers, that is
the Standard 7.01 or the NIST 6.86 are the most appropriate for this
purpose even though both meters can be calibrated with any of the 5
memorized calibration solutions.
•Immerse the pH electrode into a pH buffer
solution (e.g. pH 6.86) and stir gently.
Note: The electrode should be submerged
approximately 4 cm (1½") into the so-
lution. With the temperature probe
located as close to it as possible.
• Press the CAL key. The "CAL" and "
1
BUF
" indicators will be dis-
played. The secondary LCD will display one of the 5 buffers
(e.g."4.01").
• Press the Ï°C or аC°C
°C°C
°C key until the secondary display changes
to the buffer (“6.86”).
CFM
CAL
1
BUF
pH
°C
HI 7006
CAL
4 cm
(1½")
CAL
1
BUF
pH
22
accurate thermometer (e.g.20°C).
• Using the screwdriver, turn the tempera-
ture trimmer (# 5 pages 9-10) to display
the recorded temperature value.
• Press the pH/°C SET key for HI 9110 or the RANGE key for
HI 9210 to read pH.
pH Calibration
All three meters provide for manual pH calibration. As a result, you
can perform one or two point calibration at a buffer of your choice.
The instructions below explain a typical calibration procedure at
pH 7 and then 4 or 10.
• Remove the protective cap from the elec-
trode, rinse it with some pH 7.01 solution,
then dip in pH 7.01 buffer. Stir briefly and
wait for one minute for the reading to
stabilize.
Note: The electrode should be submerged ap-
proximately 4 cm (1½") into the
solution. For HI 9110 and HI 9210,
place the thermometer close to the pH
electrode.
• Adjust the OFFSET trimmer (#3 pages 9-10) until the LCD shows
the pH value at the buffer temperature (see page 24 for pH values
at various temperatures). With HI 9210N, press RANGE to read
the buffer temperature.
°C
°C
pH
°C
SET
RANGE
°C
HI 7007
pH

20
• Once the electrode is submerged in the
buffer solution, the LCD will notify the user
if the reading is not stable by an intermit-
tent "NOT READY". Only when the reading
is stable, will it change to a blinking
"READY" and "CON".
• Press the CFM key to confirm the calibra-
tion. If the reading is not close to the
selected buffer, "WRONG
1
BUF
" and
"WRONG " will blink alternatively. If the
reading is close to the selected buffer, the
meter stores the reading (and adjusts the
offset point). The buffer value is then dis-
played on the primary LCD and the
secondary LCD will display another buffer
value (e.g."4.01").
• Press the CAL key and the calibration pro-
cess is ended with only the offset of the
meter calibrated. For best accuracy how-
ever, do not press CAL and proceed with a
two-point calibration.
TWO-POINT CALIBRATION
After calibrating at 6.86 or 7.01 pH (see above), for the second buffer
use pH 4.01 if you are going to measure acidic samples, and pH 9.18
or pH 10.01 if you are measuring alkaline solutions.
• Proceed as described in “One-point cali-
bration above but do not end the calibration
by pressing CAL.
• After the first calibration point is confirmed,
immerse the pH electrode into the second
buffer solution (pH 4.01, 9.18 or 10.01)
and stir gently.
Note: The electrode should be submerged
approximately 4 cm (1½") into the
solution with the temperature probe lo-
cated as close to it as possible.
• Select the second buffer value on the sec-
ondary display by pressing the Ï°C or
аC°C
°C°C
°C key.
CAL
1
BUF
pH
pH
WRONG
WRONG
1
BUF
CFM
CAL
NOT READY
READY
CON
4 cm
(1½")
HI 7004
°C
°C
or
21
• When the “READY” and “CON” symbols
blink on the display, the reading is stable
and the calibration can be confirmed.
• Press the CFM key. If the reading is not close to the selected
buffer solution, “WRONG
2
BUF
” and “WRONG ” will blink alter-
natively. 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.
Note: The meter will automatically skip the buffer that was used for
the first calibration to avoid erroneous calibration. At least 1
full pH unit is required between the two buffers used for the
offset and slope calibration. As a result, once calibrated at
either pH 6.86 or 7.01, the microprocessor will automatically
ignore the other one for the second point calibration. It will do
likewise for pH 9.18 and 10.01
Note: During calibration, the secondary LCD displays the selected
buffer value. With HI 9025C, press the RANGE key to display
the buffer temperature during calibration.
PROCEDURE FOR HI9110, HI 9210 & HI 9210N:
Manual Temperature Compensation
Note: The pH/°C electrode of HI 9210N incorporates a temperature
sensor which performs automatic temperature compensation.
Consequently, the following 5 paragraphs are irrelevant to
HI 9210N and you can just proceed with pH calibration below.
• Press pH/°C SET key for HI 9110 or the RANGE key for HI 9210 to
select the manual temperature setting. The "°C" symbol will be
displayed to indicate the temperature setting mode.
• Remove the protective cap on the top of the meter to have access
to the calibration trimmers.
• Record the temperature of the buffer with a Checktemp C or an
READY
CON
WRONG
WRONG
2
BUF
CFM
pH
°C
SET
RANGE
°C