Hanna Instruments HI 9812 User manual

Instruction Manual
HI 9812 & HI 9812-5
Portable
pH/EC/TDS/°C Meters
www.hannainst.com These Instruments are in
Compliance with the CE Directives

2
PRELIMINARY EXAMINATION ........................................................ 3
GENERAL DESCRIPTION ................................................................ 3
FUNCTIONAL DESCRIPTION .......................................................... 4
SPECIFICATIONS........................................................................... 5
OPERATIONAL GUIDE ................................................................... 6
pH CALIBRATION ......................................................................... 8
pH VALUES AT VARIOUS TEMPERATURES..................................... 9
EC/TDS CALIBRATION ................................................................. 10
EC/TDS CONVERSION FACTOR..................................................... 10
BATTERY REPLACEMENT .............................................................. 11
PROBE MAINTENANCE ................................................................ 12
ACCESSORIES ............................................................................. 13
CE DECLARATION OF CONFORMITY.............................................. 14
Dear Customer,
Thank you for choosing a Hanna product.
Please read this instruction manual carefully before using the meter.
This manual will provide you with the necessary information for
correct use of the instrument, as well as a precise idea of its versatility.
If you need additional technical information, do not hesitate to e-mail
us at [email protected].
These instruments are in compliance with the directives.
TABLE OF CONTENTS
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. Probes are warranted for a period of six months.
This warranty is limited to repair or replacement free of charge.
Damages due to accidents, 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.
WARRANTY

3
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it
carefully to make sure that no damage has occurred during shipment.
If noticeable damage is found, notify your Dealer.
Each meter is supplied with:
• Combination probe with 8-pin DIN connector & 1 m (3.3') cable:
HI 1285-0, pH/EC/TDS probe, for HI 9812;
HI 1285-5, pH/EC/TDS/°C probe, for HI 9812-5
• HI 70007, pH 7.01 sachet, 1 pc
• HI 70031, 1413 µS/cm sachet, 1 pc
• HI 70032, 1382 ppm sachet, 1 pc
• HI 700661 Cleaning Solution sachet, 2 pcs
•Instruction Manual
• 1 x 9V alkaline battery.
Note: Save all packing material until you are sure that the
instrument functions correctly. Any defective items must be
returned in the original packing together with the supplied
accessories.
GENERAL DESCRIPTION
HI 9812 and HI 9812-5 are the complete, versatile and waterproof
portable combined meters specially dedicated to aquariums, fish-
farming and seawater applications.
Both models provide measurements for pH, EC and TDS ranges, which
are easily selectable through a membrane keyboard on the front
panel.
Conductivity measurements are automatically compensated for tem-
perature changes with a built-in temperature sensor. The temperature
coefficient is fixed at 2%/°C.
•HI 9812 is a pH/EC/TDS meter designed for simplicity of use in
taking pH, µS/cm and ppm measurements. Suited for hydro-
ponics, greenhouses, farming and ground water applications.
•HI 9812-5 offers all the features of HI 9812 with the addition of
temperature measurement in the °C scale.

4
FUNCTIONAL DESCRIPTION
1) 8-pin DIN connector for probe
2) Liquid Crystal Display
3) pH range selection key
4) µS/cm (EC) range selection key
5) EC/TDS calibration knob
6) pH offset calibration knob
7) ppm (TDS) selection key
8) °C (Temperature) selection key, for HI 9812-5 only
9) ON/OFF key

5
SPECIFICATIONS
Range pH 0.0 to 14.0
ppm 0 to 1990
µS/cm 0 to 1990
°C 0 to 60 (HI 9812-5 only)
Resolution pH 0.1
ppm 10
µS/cm 10
°C 1 (HI 9812-5 only)
Accuracy pH ±0.1
(@20°C/68°F) ppm ±2% f.s.
µS/cm ±2% f.s.
°C ±1 (HI 9812-5 only)
Conversion Factor 0.5
Typical EMC pH ±0.1
Deviation ppm ±2% f.s.
µS/cm ±2% f.s.
°C ±1 (HI 9812-5 only)
pH Calibration Manual, 1-point through
offset trimmer
EC/TDS Calibration Manual, 1-point through slope trimmer
EC/TDS Temperature Automatic from 0 to 50°C (32 to 122°F)
Compensation with ß = 2%/°C
Probe (included) HI 1285-0 for HI 9812
HI 1285-5 for HI 9812-5
Battery Type 1 x 9V alkaline (IEC 6LR61)
Life approx. 150 hours of continuous use
Environment 0 to 50°C (32 to 122°F); 100% RH
Dimensions 165 x 75 x 45 mm
(6.5 x 3.0 x 1.8")
Weight 250 g (8.8 oz.)

6
OPERATIONAL GUIDE
INITIAL PREPARATION
Each meter is supplied complete with a 9V battery. Remove the
battery compartment cover on the back of the meter and install the
battery while paying attention to its polarity.
Connect the probe to the DIN socket on the top of the meter by
aligning the pins with the socket and pushing in the plug.
Always remove the electrode protective cap before taking any mea-
surements and make sure the meter has been calibrated before
taking any measurements.
Turn the meter on by pressing the ON/OFF key.
TAKING pH MEASUREMENTS
If the probe has been left dry, soak the tip in HI 70300 storage
solution for a few minutes to reactivate it.
• To take a pH measurement simply submerge the
tip (4cm/1½") of the probe into the sample to
be tested.
• Select the pH mode.
• Stir briefly and wait a couple of
minutes for the reading to adjust
and stabilize. The display shows
the pH value.
• If measurements are taken in different samples successively, it is
recommended to rinse (clean) the probe thoroughly to eliminate
cross-contamination. After cleaning, it is recommended to rinse
the probe with some of the next sample to be measured.
TAKING EC/TDS MEASUREMENTS
• Immerse the tip of the probe (4cm/1½") into the
sample to be tested. If possible, use plastic beakers
or containers to minimize any EMC interference.
• Tap the probe lightly on the bottom of the
beaker to remove any air bubbles which may be
trapped inside the tip.

7
• Select the appropriate measurement range (EC or TDS).
• Wait a couple of minutes for the temperature sensor to reach
thermal equilibrium. The display will then show the measurement
automatically temperature compensated for temperature with the
appropriate indication among the following:
"µS" symbol indicates the meter is
in EC mode;
no symbol indicates the meter is in
TDS mode.
TAKING TEMPERATURE MEASUREMENTS
(for HI 9812-5 only)
• Submerge the tip (4cm/1½") of the
probe into the sample to be tested.
• Select the °C mode.
• Stir briefly and wait a couple of
minutes for the reading to adjust
and stabilize. The display shows the
temperature value.
Note: If the display shows only a "1"
on the far left hand side, the
reading is out of range.
Note: It is recommended to clean often the probe with HI 700661
Cleaning Solution.
Note: After measurements have been completed, the instrument
should be switched off, and the probe cleaned and covered
with the protective cap.

8
For greatest accuracy, frequent calibration of the instrument is
recommended. The instrument should be recalibrated for pH:
a) Whenever the electrode is replaced.
b) At least once a month.
c) After testing aggressive chemicals.
d) Where extreme accuracy is required.
PREPARATION
Pour small quantities of pH 7.01 (HI 7007) or pH 4.01 (HI 7004) or
pH 10.01 (HI 7010) solution into a clean beaker.
To obtain accurate readings, use pH 7.01 (HI 7007) if you are going
to measure neutral or close to neutral samples, pH 4.01 (HI 7004) if
you are going to measure acidic samples or pH 10.01 (HI 7010) for
alkaline measurements.
If you need to calibrate to NBS standards, use pH 6.86 (HI 7006)
instead of pH 7.01 and pH 9.18 (HI 7009) instead of pH 10.01.
PROCEDURE
• Connect the probe and switch the meter on, then press the "pH"
key to display pH measurement.
•Remove the protective cap from the probe, rinse and immerse it
in the buffer and stir gently. Wait a couple of minutes for the
reading to stabilize.
• Take the temperature of the buffer solution,
e.g. 10.0°C, as follow:
for HI 9812, with a ChecktempC (or another
accurate thermometer);
for HI 9812-5, select the °C mode and
read the displayed value.
• Adjust the pH calibration knob until the
LCD shows the pH value at the above
temperature (see the pH versus tempera-
ture chart).
• The pH calibration is now complete.
pH CALIBRATION

9
For temperature compensation during calibration, please refer to the
following chart.
pH VALUES AT VARIOUS TEMPERATURES
For instance, if the buffer temperature is 25°C, the display should
show pH 4.0 or 7.0 or 10.0.
If the buffer temperature is 10°C, the display should show pH 4.0 or
7.0 or 10.1.
Note: The probe should be submerged approximately 4 cm (1½") into the
solution. The ChecktempC thermometer has to be located close to
the probe.
Note: If turning the knob the needed value can not be reached,
clean the probe (see the "Probe Maintenance" section).
If also after the probe cleaning the value can not be reached,
replace the probe.
TEMP pHVALUES
°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

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The TDS value in aqueous solutions is directly proportional to the
conductivity. The ratio between the two parameters depends on the
solution.
Both HI 9812 and HI 9812-5 models have a fixed conversion factor
set to 0.5. This means that 1 µS/cm is equal to 0.5 ppm of TDS.
EC/TDS CALIBRATION
Accessories needed:
• Use HI 70031 (1413 µS/cm) EC calibration solution or HI
70032 (1382 ppm) TDS calibration solution.
Note: The conversion between EC and TDS is made by a built-in
circuit, hence it is requested to calibrate the meter only in EC
or TDS range. The other range is thus automatically cali-
brated.
PROCEDURE
• Pour approximately 4 cm (1½") of a conductivity calibration
solution (e.g. HI 70031) into a beaker. If possible, use plastic
beaker to minimize any EMC interference.
• Immerse the probe in the solution.
• Wait for a couple of minutes for thermal equilibrium to be
reached.
• Tap the probe on the bottom, then shake it lightly while rotating
to make sure no air bubbles remain trapped inside the probe.
• Press the "µS/cm" (or "ppm") key.
• Turn the EC/TDS calibration knob until
the display shows the EC or TDS reading
at 25°C.
EC/TDS CONVERSION FACTOR

11
These meters are powered by a 9V battery that is located on the rear
of the instrument.
When the battery level is so low that it may cause unreliable
measurements, the meter turns off.
It is recommended to replace the battery immediately.
Battery replacement must only take place in a nonhazardous area
using a 9V alkaline battery.
Unscrew the three screws on the rear of the meter, remove the battery
compartment cover and replace the 9V battery with a new one while
paying attention to its polarity.
Make sure the battery contacts are tight and secure before replacing
the cover.
BATTERY REPLACEMENT

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PROBE MAINTENANCE
PERIODIC MAINTENANCE
Inspect the probe and the cable. The cable used for the connection to
the meter must be intact and there must be no points of broken
insulation on the cable or cracks on the probe stem or bulb.
Connector must be perfectly clean and dry. If any scratches or cracks
are present, replace the electrode. Rinse off any salt deposits with
water.
CLEANING PROCEDURE
For better accuracy in measurements and to ensure a good perfor-
mance of the probe, a frequent cleaning is recommended.
For this purpose, soak it in Hanna HI 700661 Cleaning Solution for
5 minutes.
Note: For particular dirty (as for example protein, oil or grease) see
the "Accessories" section for Hanna specific solutions.
Note: After cleaning the probe, it is recommended to recalibrate the
meter. If it is not possible to calibrate, the probe has to be
replaced with a new one.
Note: For field applications, it is always recommended to keep a
spare probe handy. When anomalies are not resolved with
simple maintenance, change the probe and recalibrate the
meter.

13
Hanna Instruments reserves the right to modify the design, construc-
tion and appearance of its products without advance notice.
ACCESSORIES
PROBES
HI 1285-0 Combination, amplified pH/EC/TDS probe with built-in
temperature sensor, 8-pin DIN connector and 1 m
(3.3') cable
HI 1285-5 Combination, amplified pH/EC/TDS/temperature probe
with built-in temperature sensor, 8-pin DIN connector
and 1 m (3.3') cable
pH BUFFER SOLUTIONS
HI 7004L pH 4.01 buffer solution, 500 mL bottle
HI 7006L pH 6.86 buffer solution, 500 mL bottle
HI 7007L pH 7.01 buffer solution, 500 mL bottle
HI 7009L pH 9.18 buffer solution, 500 mL bottle
HI 7010L pH 10.01 buffer solution, 500 mL bottle
CONDUCTIVITY & TDS CALIBRATION SOLUTIONS
HI 7031L 1413 µS/cm solution, 460 mL bottle
HI 7032L 1382 ppm (mg/L) solution, 460 mL bottle
OTHER SOLUTIONS
HI 700661P Cleaning Solution, 20 mL sachet (25 pcs)
HI 70300L Storage Solution, 500 mL bottle
HI 7073L Protein Cleaning Solution, 500 mL bottle
HI 7074L Inorganic Cleaning Solution, 500 mL bottle
HI 7077L Oil & Fat Cleaning Solution, 500 mL bottle
OTHER ACCESSORIES
CHECKTEMPC Electronic thermometer (-50.0 to 150.0°C)
HI 710001 Soft carrying case
HI 710031 Rugged carrying case

14
CE DECLARATION OF CONFORMITY
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 areas could cause unacceptable interferences to
radio and TV equipment.
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.

15
All rights are reserved. Reproduction in whole or in part is prohibited without the
written consent of the copyright owner, Hanna Instruments Inc., 584 Park East
Drive, Woonsocket, Rhode Island, 02895 , USA.
HANNA PRODUCTS
•CALIBRATIONANDMAINTENANCESOLUTIONS
•CHEMICALTEST KITS
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• DISSOLVED OXYGEN METERS
• HYGROMETERS
• ION SPECIFIC METERS
• MAGNETIC STIRRERS
• Na/NaCl METERS
• pH/ORP/Na ELECTRODES
• PROBES (DO, µS/cm, RH, T, TDS)
• PUMPS
• REAGENTS
• SOFTWARE
• THERMOMETERS
• TITRATORS
• TRANSMITTERS
• TURBIDITY METERS
• Wide Range of Accessories
Most Hanna meters are available in the following formats:
• BENCH-TOP METERS
• POCKET-SIZE METERS
• PORTABLE METERS
• PRINTING/LOGGING METERS
• PROCESS METERS (Panel- and Wall-mounted)
• WATERPROOF METERS
• METERS FOR FOOD INDUSTRY
For additional information, contact your dealer or the nearest Hanna
Customer Service Center.
You can also e-mail us at: [email protected]

www.hannainst.com
MAN9812-2
03/03