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.
If you need additional technical information, do not hesitate to e-mail
us at tech@hannainst.com
These instruments are in compliance with the directives.
WARRANTY
All Hanna Instruments meters are warranted for two years
against defects in workmanship and materials when used for their
intended purpose and maintained according to instructions. Theelectrodes and the probes are warranted for 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 shipping costs prepaid. When shipping any instrument, make
sure it is properly packaged for complete protection.
TABLE OF CONTENTS
GENERAL DESCRIPTION ........................................................................... 3
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.
Each meter is supplied complete with:
• HI 1110B pH electrode with BNC connector and 1 m cable
• 12 Vdc adapter
• instruction manual
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.
GENERAL DESCRIPTION
pH 20 and pH 21 are basic pH meters designed for simplicity of use in
all applications where rapid daily controls are required.
These meters are also suitable for educational field, where students begin
to approach pH measurements.
Both models measure pH in the 0 to 14 range, with 0.01 resolution.
In addition, pH 21 can also measure ORP (mV) by using a proper ORP
electrode (optional).
The pH calibration procedure is automatic and can be performed at
1 or 2 points.
Readings can be manually (MTC) or automatically (ATC) compensated
for temperature variations.
The automatic temperature compensation is performed if using the
optional HI 7662 temperature probe, while for manual compensation
the user can set the temperature value through the arrow keys.
The meters are also provided with the Hold function, which allows to
freeze reading on the LCD by simply pressing the HOLD button.
Hanna Instruments reserves the right to modify the design, construction and
appearance of its products without advance notice.
32
FUNCTIONAL DESCRIPTION
+
-
1. Liquid Crystal Display
2. CAL key, to enter and exit the calibration mode
3. CFM key, to confirm calibration values
↑↑
4.
5. HOLD key, to freeze reading on display
6. RANGE key, to select measurement range
7. ON/OFF key, to turn the meter on and off
REAR PANEL
1. BNC connector for pH or ORP (pH 21 only) electrode.
2. Temperature probe socket for use with the HI 7662.
3. Power supply input. Plug the 12 Vdc adapter into the DC socket,
then into the mains.
Notes:
•Make sure the mains line is protected by a fuse.
•If the instrument needs to be unplugged, press the ON/OFF
↓↓
↑°C and
↓°C keys, to manually set temperature value for
↑↑
↓↓
compensation
key before disconnecting it from the mains.
Note: These instruments use the following configuration.
It is recommended to use the Hanna HI 710005 or HI 710006
voltage adapters (supplied with the meter) which are provided with
the proper polarity configuration.
The meters can also be powered with other adapters. In this case,
remember to check the correct polarity of the adapter before connecting it to the meter.
SPECIFICATIONS
RangepH0.00 to 14.00
ORP±1999 mV (pH 21 only)
°C0.0 to 100.0
ResolutionpH0.01
ORP1 mV (pH 21 only)
°C0.1
AccuracypH±0.02
(@20°C/68°F) ORP±2 mV (pH 21 only)
°C±1
pH CalibrationAutomatic, 1 or 2 point
TemperatureAutomatic (with temperature probe) or
Compensationmanual (adjustable with arrow keys)
pH ElectrodeHI 1110B combination pH electrode
with BNC and 1 m cable (included)
Temperature probeHI 7662 (optional)
Power supply12 Vdc adapter (included)
Environment0 to 50°C (32 to 122°F)
RH max 95% non-condensing
Dimensions230 x 170 x 75 mm (9.1x6.7x 3")
Weight500 g (1.1 lb.)
54
OPERATIONAL GUIDE
TAKING pH MEASUREMENTS
• Make sure that the instrument has been calibrated for pH before
taking measurements (see "pH Calibration" section for details).
• Connect the supplied HI 1110B pH electrode to the BNC connec-
tor on the rear panel (see page 4).
• If automatic temperature compensation is required, connect the
HI 7662 temperature probe (optional) to the proper socket on
the rear panel (see page 4).
• Connect the 12VDC power adapter to the instrument (see page 4)
and then to the mains.
• Press the ON/OFF key to turn the meter
on.
• Press the RANGE key to select the pH
mode, if necessary.
• Remove the electrode protective cap, then immerse the pH
electrode and the temperature probe in the sample to be tested.
Note: If the pH electrode is dry, immerse it in HI 70300 storage
solution for at least one hour to reactivate it.
Note: The pH electrode should be submerged
approximately 4 cm (1½") into the
solution and the temperature probe (if
used) should be located as close as
possible to the electrode.
Note: With refillable electrodes, to obtain a faster response unscrew
the refill hole cap during measurements.
• Shake briefly and wait a few seconds for
the reading to stabilize, i.e. when the
hourglass symbol stops blinking. The LCD
will show the pH value automatically compensated for temperature variations.
• After measurements, turn the meter off by pressing the ON/OFF
key, disconnect the power adapter from the mains and the pH
electrode from the instrument.
• Store the electrode with a few drops of HI 70300 solution in the
protective cap.
NEVER USE DISTILLED OR DEIONIZED WATER FOR STORING
PURPOSES.
Note: If measurements are taken in different samples successively, it is
recommended to clean the electrode thoroughly to avoid crosscontamination. After cleaning, rinse the electrode with water
and then with some of the solution to be tested.
MANUAL TEMPERATURE COMPENSATION
• When the temperature probe is not connected, the default
temperature value is 25°C.
• To temperature compensate the pH reading, measure the temperature of the solution
with a ChecktempC or another accurate
thermometer. E.g. 20°C.
• Press the RANGE key to enter the °C mode and adjust the
displayed value by using the arrow keys.
TAKING ORP MEASUREMENTS (for pH21 only)
• The meter is factory calibrated for ORP (mV) range. Please
contact the nearest Hanna Service Center for recalibration,
if needed.
• Connect an ORP electrode (optional, see "Accessories" section) to the
BNC connector on the rear panel (see page 4).
• Connect the 12VDC power adapter to the instrument (see page 4)
and then to the mains.
• Press the ON/OFF key to turn the meter
on.
• Press the RANGE key to select the ORP
(mV) mode.
• Remove the electrode protective cap, then immerse the ORP
electrode in the sample to be tested.
Note: The electrode should be submerged approximately 4 cm (1½")
into the solution.
Note: With refillable electrodes, to obtain a faster response unscrew
the refill hole cap during measurements.
• Shake briefly and wait a few seconds for
the reading to stabilize, i.e. when the
hourglass symbol stops blinking. The LCD
will show the ORP (mV) value.
76
• After measurements, turn the meter off by pressing the ON/OFF
key, disconnect the power adapter from the mains and the
electrode from the instrument.
Note: To perform correct ORP measurements, the surface of the ORP
electrode must be clean and smooth.
Note: 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.
TAKING TEMPERATURE MEASUREMENTS
• The meter is factory calibrated for temperature range.
Please contact the nearest Hanna Service Center for
recalibration, if needed.
• Connect the HI 7662 temperature probe (optional) to the proper
connector on the rear panel (see page 4).
• Connect the 12VDC power adapter to the instrument (see page 4)
and then to the mains.
• Press the ON/OFF key to turn the meter
on.
• Press the RANGE key to select the temperature (°C) mode.
• Immerse the probe in the sample to be tested.
• Shake briefly and wait a few seconds for
the reading to stabilize, i.e. when the
hourglass symbol stops blinking. The LCD
will show the temperature (°C) value.
• After measurements, turn the meter off by pressing the ON/OFF
key, disconnect the power adapter from the mains and the probe
from the instrument.
HOLD FUNCTION
• To freeze a reading on display, from measurement mode press
and hold the HOLD key. The "HOLD" tag will light up.
pH CALIBRATION
For better accuracy the instruments should be calibrated frequently,
and however:
1. After electrode replacement.
2. After testing aggressive chemicals.
3. At least once a month.
4. When extreme accuracy is required.
• Turn the instrument on after connecting the pH electrode and the
temperature probe.
• Immerse the temperature probe together with the electrode into
pH 7.01 buffer solution or manually set the temperature (see the
note here below).
Note: The pH electrode should be submerged approximately 4 cm
(1½") into the solution and the temperature probe should be
located as close as possible to the electrode.
Note: If the temperature probe is not used, measure the buffer value
with a thermometer, enter the °C mode by pressing the RANGE
key and adjust the displayed value by using the arrow keys.
• Press the RANGE key to display pH readings.
• Press the CAL key to enter the calibration mode: the display
flashes "pH 7.01" and the hourglass symbol lights up.
• Wait till the hourglass symbol on the LCD turns off and the "pH"
tag stops blinking, then press CFM to confirm the first calibration
point (offset). "pH 4.01" will flash on the LCD.
• The meter returns to normal mode when the HOLD key is released.
Note: The RANGE key is not working while in HOLD mode.
• If a single point calibration at pH 7.01 is desired, press the CAL
key to exit, otherwise proceed with the second point.
• Rinse and immerse both pH electrode and temperature probe (if
used) in pH 4.01 or pH 10.01 buffer solution. The meter
automatically recognizes the buffer and displays the correct value.
98
• Wait till the hourglass symbol on the LCD turns off and the "pH"
tag stops blinking, then press CFM to confirm the second calibration point (slope).
• The meter automatically returns to normal measurement mode.
Note: To abort a calibration procedure and save previous calibration
data, press the CAL key while the "pH" tag is still blinking.
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 times.
During operation, ESD wrist straps should be worn to avoid possible damage to the
electrode by electrostatic discharges.
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 60VDC.
To avoid damages or burns, do not perform any measurement in microwave ovens.
ELECTRODE CONDITIONING & MAINTENANCE
PREPARATION
Remove the electrode 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 conditions.
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 HI 70300
Storage Solution for at least one hour.
For refillable electrodes, if the refill solution (electrolyte) is more than
2½ cm (1") below the fill hole, add the appropriate Electrolyte
Solution.
MEASUREMENT
Rinse the electrode tip with distilled water, immerse it (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 the solution to be tested, before taking
any measurements.
STORAGE
To minimize clogging and ensure a quick response time, the glass
bulb and the junction should always be kept moist.
When not in use, store it with a few drops of HI 70300 storage
solution or HI 7007 pH 7.01 buffer in the protective cap.
NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED
WATER.
PERIODIC MAINTENANCE
Inspect electrode and 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. If any
scratches or cracks are present, replace the electrode. Rinse off any salt
deposits with water.
Connectors must be perfectly clean and dry.
Refill the electrode with fresh electrolyte (see the electrode’s specifications to select the correct refilling solution). Allow the electrode to
stand upright for 1 hour. Follow the Storage Procedure.
1110
CLEANING PROCEDURE
General : Soak in HI7061 General Cleaning Solution for about 30
minutes.
Removal of films, dirt or deposits on the membrane/junction:
Protein : Soak in HI 7073 Protein Cleaning Solution for 15 minutes.
Inorganic : Soak in HI 7074 Inorganic Cleaning Solution for 15
minutes.
Oil/ grease : Soak in HI7077 Oil & Fat Cleaning Solution for 1
minute.
IMPORTANT: After performing any of the cleaning procedures, rinse
the electrode thoroughly with distilled water and soak it in HI70300
Storage Solution for at least 1 hour before taking measurements.
TROUBLESHOOTING
Evaluate the electrode performance based on the following.
• Noise (Readings fluctuate up and down) could be due to:
- Clogged/Dirty Junction: refer to the Cleaning Procedure.
- Loss of shielding due to low electrolyte level: refill with
proper solution.
• Dry Membrane/Junction: soak in HI70300 Storage Solution for
at least 1 hour.
• Drifting: soak the electrode tip in warm HI7082 Solution for one
hour and rinse the tip with distilled water (refill with fresh
electrolyte if necessary).
• Low Slope: refer to the Cleaning Procedure.
• No Slope: - Check the electrode for cracks in glass stem or bulb
(replace the electrode if cracks are found).
- Make sure cable and connections are not damaged nor lying in a pool of water or solution.
• Slow Response/Excessive Drift: soak the tip in HI7061 Solution for 30 min, rinse thoroughly in distilled water and then
follow the Cleaning Procedure.
• For ORP Electrodes: polish the metal tip with a lightly abrasive
paper while paying attention not to scratch the surface, then
wash it thoroughly with water.
Note: For field applications, it is always recommended to keep a
conditioned spare electrode handy. When anomalies can not
be resolved with a simple maintenance, change the electrode
and recalibrate the meter.
ACCESSORIES
pH CALIBRATION SOLUTIONS
HI 70004P pH 4.01 buffer solution, 20 mL sachet, 25 pcs
HI 7004MpH 4.01 buffer solution, 230 mL bottle
HI 7004LpH 4.01 buffer solution, 500 mL bottle
HI 8004LpH 4.01 buffer solution, 500 mL FDA bottle
HI 70007P pH 7.01 buffer solution, 20 mL sachet, 25 pcs
HI 7007MpH 7.01 buffer solution, 230 mL bottle
HI 7007LpH 7.01 buffer solution, 500 mL bottle
HI 8007LpH 7.01 buffer solution, 500 mL FDA bottle
HI 70010P pH 10.01 buffer solution, 20 mL sachet, 25 pcs
HI 7010MpH 10.01 buffer solution, 230 mL bottle
HI 7010LpH 10.01 buffer solution, 500 mL bottle
HI 8010LpH 10.01 buffer solution, 500 mL FDA bottle
STORAGE & CLEANING SOLUTIONS
HI 70300M Storage solution, 230 mL bottle
HI 80300M Storage solution, 230 mL FDA bottle
HI 70300L Storage solution, 500 mL bottle
HI 80300L Storage solution, 500 mL FDA bottle
HI 70000P Electrode rinsing solution, 20 mL sachet, 25 pcs
HI 7061MGeneral cleaning solution, 230 mL bottle
HI 8061MGeneral cleaning solution, 230 mL FDA bottle
HI 7061LGeneral cleaning solution, 500 mL bottle
HI 8061LGeneral cleaning solution, 500 mL FDA bottle
HI 7073MProtein cleaning solution, 230 mL bottle
HI 8073MProtein cleaning solution, 230 mL FDA bottle
HI 7073LProtein cleaning solution, 500 mL bottle
HI 8073LProtein cleaning solution, 230 mL FDA bottle
HI 7074MInorganic cleaning solution, 230 mL bottle
HI 7074LInorganic cleaning solution, 500 mL bottle
HI 7077MOil & Fat cleaning solution, 230 mL bottle
HI 8077MOil & Fat cleaning solution, 230 mL FDA bottle
HI 7077LOil & Fat cleaning solution, 500 mL bottle
HI 8077LOil & Fat cleaning solution, 500 mL FDA bottle
REFILLING ELECTROLYTE SOLUTIONS
HI 70713.5M KCl + AgCl electrolyte, 4 x 30 mL, for single
junction electrodes
HI 80713.5M KCl + AgCl electrolyte, 4 x 30 mL, for single
junction electrodes (FDA approved bottle)
HI 70721M KNO3 electrolyte, 4 x 30 mL
1312
HI 80721M KNO3 electrolyte, 4 x 30 mL (FDA approved bottle)
HI 70823.5M KCl electrolyte, 4 x 30 mL, for double junction
electrodes
HI 80823.5M KCl electrolyte, 4 x 30 mL, for double junction
electrodes (FDA approved bottle)
ORP SOLUTIONS
HI 7091MReducing pretreatment solution, 230 mL bottle
HI 7091LReducing pretreatment solution, 500 mL bottle
HI 7092MOxidizing pretreatment solution, 230 mL bottle
HI 7092LOxidizing pretreatment solution, 500 mL bottle
HI 7020MTest solution, 200-275 mV, 230 mL bottle
HI 7020LTest solution, 200-275 mV, 500 mL bottle
HI 7021MTest solution, 240 mV, 230 mL bottle
HI 7021LTest solution, 240 mV, 500 mL bottle
HI 7022MTest solution, 470 mV, 230 mL bottle
HI 7022LTest solution, 470 mV, 500 mL bottle
pH ELECTRODES
All electrode part numbers ending with B are supplied with BNC
connector and 1 m (3.3') cable.
HI 1043BGlass body, double junction, refillable, combination.
Use: strong acid/alkali.
HI 1048BGlass body, annular open junction, refillable, combina-
tion. Use: wine processing.
HI 1053BGlass body, triple ceramic junction, conic shape, refill-
able, combination. Use: emulsions.
HI 1083BGlass body, micro, Viscolene, non-refillable, combina-
tion. Use: biotechnology, micro titration.
HI 1110BGlass body, single junction, gel-filled, combination.
Use: general purpose.
HI 1131BGlass body, single junction, refillable, combination.
Use: general purpose.
HI 1230BPlastic body, double junction, gel-filled, combination.
Use: general, field.
HI 1330BGlass body, semimicro, single junction, refillable, com-
bination. Use: laboratory, vials.
HI 1331BGlass body, semimicro, single junction, refillable, com-
bination. Use: flasks.
HI 1332BPlastic body, double junction, refillable, combination.
Use: general purpose.
HI 1413BGlass body, single junction, flat tip, Viscolene, non-
HI 2031BGlass body, semimicro, conic tip, refillable, combina-
tion. Use: semisolid products.
FC 100BPVDF body, double junction, refillable, combination.
Use: general purpose for food industry.
FC 200BPVDF body, open junction, conic shape, Viscolene, non-
refillable, combination. Use: meat, cheese.
FC 210BGlass body, double junction, conic shape, Viscolene,
non-refillable, combination. Use: milk, yogurt.
FC 220BGlass body, triple ceramic junction, refillable, combina-
tion. Use: food processing.
ORP ELECTRODES
All electrode part numbers ending with B are supplied with BNC
connector and 1 m (3.3') cable.
HI 3131BGlass body, refillable, combination, platinum sensor.
Use: titration.
HI 3230BPlastic body, gel-filled, combination, platinum sensor.
Use: general purpose.
HI 4430BPlastic body, gel-filled, combination gold sensor.
Use: general purpose.
For a complete list of available pH and ORP electrodes, consult the
Hanna General Catalog or visit www.hannainst.com
OTHER ACCESSORIES
ChecktempC Pocket-size thermometer (range -50.0 to 150.0°C)
HI 710005 115 Vac/12 Vdc power adapter, US plug
HI 710006 230 Vac/12 Vdc power adapter, European plug
HI 76405Electrode holder
HI 7662Temperature probe with 1 m (3.3') cable
HI 8427pH/ORP electrode simulator with 1 m (3.3') coaxial
cable and BNC connector
HI 931001 pH/ORP electrode simulator with LCD, 1 m (3.3')
coaxial cable and BNC connector
SALES AND TECHNICAL SERVICE CONTACTS
Australia:
Tel. (03) 9769.0666 • Fax (03) 9769.0699
China:
Tel. (10) 88570068 • Fax (10) 88570060
Egypt:
Tel. & Fax (02) 2758.683
Germany:
Tel. (07851) 9129-0 • Fax (07851) 9129-99
Greece:
Tel. (210) 823.5192 • Fax (210) 884.0210
Indonesia:
Tel. (21) 4584.2941 • Fax (21) 4584.2942
Japan:
Tel. (03) 3258.9565 • Fax (03) 3258.9567
Korea:
Tel. (02) 2278.5147 • Fax (02) 2264.1729
Malaysia:
Tel. (603) 5638.9940 • Fax (603) 5638.9829
Singapore:
Tel. 6296.7118 • Fax 6291.6906
South Africa:
Tel. (011) 615.6076 • Fax (011) 615.8582
Taiwan:
Tel. 886.2.2739.3014 • Fax 886.2.2739.2983
Thailand:
Tel. 66.2619.0708 • Fax 66.2619.0061
United Kingdom:
Tel. (01525) 850.855 • Fax (01525) 853.668
USA:
Tel. (401) 765.7500 • Fax (401) 765.7575
For e-mail contacts and complete list of Sales and
Technical offices, please see www.hannainst.com
MANPH21R1 07/05
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