Instruction Manual
HI 9143 • HI 9145
Portable D.O. Meters
in Water-Resistant Casing
SAMPLE
ppm
°C
HI 9143
Microprocessor
Auto Cal
Dissolved
ON/OFF
Oxygen Meter
CAL
RANGE
HOLD
FACTOR
www.hannainst.com
Dear Customer,
Thank you for choosing a HANNA product.
Please read this instruction manual carefully
before using the instrument.
This manual will provide you with the neces-
sary information for a correct use of the instrument.
If you need additional technical support, do not
hesitate to e-mail us at tech@hannainst.com
These instruments are in compliance with the
CE directives.
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, immediately notify your dealer.
Each meter is supplied complete with:
• HI 76407/4 DO probe with 4 m (13’) cable
• 2 spare membranes with O-rings
• Protective cap
• HI 7041S electrolyte solution (30 mL)
• Batteries (4 x 1.5V AA)
• Instruction manual
• Rugged carrying case
Note: Save all packing material until you are
sure that the instrument functions
correctly. Any defective items must be
returned in the original packing with the
supplied accessories.
TABLE OF CONTENTS
Preliminary Examination ............................. 3
General Description..................................... 3
Functional Description - Probe .................... 4
Functional Description - Meter..................... 5
Specifications ............................................. 6
Probe Preparation ....................................... 7
Cali bratio n ................................................... 8
Taking Measurements............................... 10
Altitude Compensation .............................. 12
Salinity Compensation .............................. 13
Probe & Membrane Maintenance .............. 14
Battery Replacement ................................ 16
Accessories.............................................. 17
Warranty ................................................... 18
CE Declaration of Conformity .................... 19
23
GENERAL DESCRIPTION
HI 9143 and HI 9145 are water-resistant
dissolved oxygen meters designed for harsh
outdoor applications, especially waste water
treatment and fish farming.
Simple on-site calibration requires no chemical
solutions. Just expose the probe to air and
press the CAL button. In a few minutes, the
meter is calibrated and ready to use.
The new and improved HI 9143 and HI 9145
measure and display O2 from 0 to 300%, 0 to
45 mg/L and temperature from 0 to 50 °C.
In addition to the features of HI 9145, HI 9143
also supplies the user with compensation of
salinity and altitude factors.
Both meters compensate for the temperature
effect.
HI 9143
Microprocessor
Auto Cal
Dissolved
Oxygen Meter
CAL
ON/OFF
RANGE
FACTOR
85
9
67
23
24
4
19
20
21
22
3
210
SAMPLE
LOBAT
SAMPLE
HOLD
CAL
F1
F2
HOLD
ppm
ppm
%
°C
°C
1
2
10
The dissolved oxygen probe is provided with a
membrane covering the polarographic sensor
elements, and a built-in thermistor for temperature measurement and compensation.
The thin permeable membrane isolates the
sensor elements from the testing solution, but
allows oxygen to enter.
When a voltage is applied across the sensor,
oxygen that passes through the membrane
causes a current to flow from which the oxygen
concentration is determined.
FUNCTIONAL DESCRIPTION - PROBE
3
1
FUNCTIONAL DESCRIPTION - METER
4
6
7
8
9
4
5
6
7
8
9
1. D.O. probe
2. Protective cap
3. Watertight shielded cable
4. Polypropylene body
5. Temperature sensor
6. O-Ring seal
7. AgCl (silver chloride) anode
8. Platinum cathode
9. Oxygen permeable membrane
10. Membrane cap
45
1) Battery compartment
2 ) Probe connector
3) Liquid Crystal Display (LCD)
4) ON/OFF key
5) CAL key, to enter/exit calibration mode
6) FACTOR* key, to select altitude (F1)
and salinity (F2)
2
10
7) UP* and DOWN* arrow keys, to set F1
and F2 values
8) HOLD key, to freeze reading on display
9) RANGE key, to select oxygen measurement range (ppm or % of saturation)
10) Socket for 12 Vdc power adapter
19) “LOW BAT”, low battery indicator
20) “SAMPLE”, measuring mode indicator
21) “F1”, altitude factor* indicator
22) “F2”, salinity factor* indicator
23) “%” or “ppm”, oxygen measure unit
24) Secondary display
(*) HI 9143 only
SPECIFICATIONS
PROBE PREPARATION
HI 9143 HI 9145
Range 0.00 to 45.00 mg/L O
0.0 to 300.0% O
0.0 to 50.0°C
Resolution 0.01 mg/L / 0.1% O
0.1°C
Accuracy (@20°C/68°F)
±1.5% FS (O2)
±0.5°C
Typical EMC Deviation
±0.3 mg/L / ±3.5% O
±0.5 °C
Calibration Automatic, in air, at 100%
Temperature Compensation
Automatic, 0 to 50°C (32 to 122°F)
Altitude Compensation
0 to 1900 m ---
(resolution 100 m)
Salinity Compensation
0 to 40 g/L ---
(resolution 1 g/L)
Probe HI 76407/4 polarographic
with 4 m (13’) cable (included)
Environment 0 to 50°C (32 to 122°F);
RH max 100%
Power Supply
4 x 1.5V AA batteries;
approx. 200 hours of continuous use;
auto-off after 4 hours of inactivity;
or input for 12 Vdc adapter
Dimensions 196 x 80 x 60 mm
(7.7 x 3.1 x 2.4")
Weight 500 g (1.1 lb.)
2
2
2
2
All HANNA D.O. probes are shipped dry. To
hydrate the probe and prepare it for use,
connect it to the meter and proceed as follows.
1. Remove the red & black plas-
Shipping
cap
tic cap used for shipping purposes only.
2. Wet the sensor by soaking
black
the bottom (2.5 cm/1") of the
probe in HI 7041S electrolyte
solution for 5 minutes.
red
3. Rinse the sup-
plied membrane
(HI76407A) with
some electrolyte while shaking it gently.
Refill with fresh
electrolyte.
4. Gently tap the
sides of the
SECOND
FILL
THIRD
TAP
FIRST
INSERT
O’RING
membrane with
your finger to
ensure that no
air bubbles remain trapped.
To avoid any
THEN SCREW
BACK ON
damage, do not
tap the membrane directly on the bottom.
5. Make sure that the rubber O-ring sits properly inside the membrane cap.
6. With the sensor facing down, screw the
cap clockwise. Some electrolyte will overflow.
When not in use, protect the
membrane with the supplied cap.
67
CALIBRATION
PROBE POLARIZATION
The probe is under polarization with a fixed
voltage of approximately 800 mV. Probe polarization is essential for stable measurements
with the same recurring degree of accuracy.
With the probe properly polarized, oxygen is
continually "consumed" by passing through the
sensitive diaphragm and dissolving in the electrolyte solution contained inside the probe.
If this operation is interrupted, the electrolyte
solution continues to be enriched with oxygen
until it reaches an equilibrium with the surrounding solution. Measurements taken with a nonpolarized probe give an oxygen level that indicates that of the test solution as well as any
oxygen present in the electrolyte solution. This
reading is obviously incorrect.
The HANNA HI 9143 and HI 9145 oxygen meter
automatically polarize the probe each time they
are switched on.
Calibration is simple and is recommended every
time the meter is switched on.
• Make sure the probe is ready for measurement (see page 7), i.e. the membrane is
filled with electrolyte, probe is connected to
the meter and properly polarized.
• Switch the meter on.
• "COND" appears on the display to inform the user that
ON/OFF
the probe is in auto-conditioning (automatic polarization) mode.
• Once "COND" disappears, the probe is polarized and the instrument can be calibrated.
• For an accurate calibration, it is recommended to wait an additional 5-10 minutes to
ensure optimum conditioning of the probe.
• Remove the protective cap.
• Press CAL. The disply shows
"----" together with the "CAL"
symbol to indicate that the
instrument is in calibration
CAL
mode.
• The instrument will automatically standardize itself to the
CAL
actual saturation value. After
approx. 1 minute it will display "100%" with "SAMPLE"
to indicate that the calibra-
SAMPLE
%
°C
tion is complete.
• HI 9143 only: press FACTOR and ensure
that F1 and F2 are set to the appropriate
altitude and salinity values.
Notes: • The instrument must be calibrated
whenever the probe, membrane or
electrolyte is changed.
• To exit the calibration
mode at any time,
press CAL.
• The display may be
CAL
switched from readings
in % saturation to ppm
(mg/L) by simply
pressing the RANGE
RANGE
key. Recalibration is
not needed.
89
TAKING MEASUREMENTS
Make sure the meter has been
calibrated and the protective
cap has been removed. Immerse the tip of the probe in the
sample to be tested ensuring
that the temperature sensor is
also immersed.
To display values in % saturation, press RANGE.
RANGE
For accurate dissolved oxygen measurements,
a water movement of at least 30 cm (12”)/sec is
required. This is to ensure that oxygen depleted
on the membrane surface is constantly replenished. A moving stream will provide adequate
circulation.
During field measurements, this condition may
be obtained by manually stirring the probe.
Accurate readings are not possible while the
liquid is stationary.
During laboratory measurements, the use of a
magnetic stirrer to ensure a certain agitation of
the fluid is recommended. This way, any errors
due to the presence of air bubbles on the
menbrane surface are minimized.
For accurate measurements, allow sufficient
time for the thermal equilibrium to be reached
between the probe and the measured sample (a
few minutes if the temperature difference is
several degrees).
mg/L READINGS
The mg/L mode give the dissolved oxygen
concentration directly in ppm.
If the sample contains significant salinity or if
the measurement is taken at a higher altitude
than sea level, the readout values must be
corrected, by taking into account the lower
degree of oxygen solubility in such conditions.
Compensation for altitude and sality effects
is possible with the HI 9143 model.
Altitude and/or salinity values should be set
before calibrating and taking measurements.
The meter will automatically compensate for
these factors (see “Altitude Compensation”
and “Salinity Compensation” sections).
% O2 SATURATION READINGS
The % O2 reading provides the rate of oxygen
saturation with reference to
100% at sea level.
SAMPLE
%
°C
TEMPERATURE
READINGS
The secondary display will show the sample
temperature in Celsius degrees.
Allow the probe to reach thermal equilibrium
with the sample before taking any
measurement. The greater the difference
between the ambient temperature and the
temperature of the sample, the longer it will take
the probe to acclimatized itself to the sample.
10 11
ALTITUDE COMPENSATION
SALINITY COMPENSATION
HI 9143
Press FACTOR and “F1” will
be displayed.
Use the UP and DOWN keys
SAMPLE
F1
or
to set the altitude from 0 to
1900 m, in steps of 100 m.
HI 9145
With HI 9145, all the DO readings refer to the
sea level. Altitude affects the DO concentration
by decreasing its value.
The following table reports the maximum oxygen
solubility at various temperatures and altitudes.
The table provides an idea of the error that can
be introduced at different altitudes and the
quantity to be subtracted to correct the reading.
Altitude above Sea Level (in meters)
°C
0 m
300 m
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
600 m
0
14.6
14.1
2
13.8
4
13.1
6
12.4
8
11.8
11.3
10.8
10.3
9.9
9.5
9.1
8.7
8.4
8.1
7.8
7.5
7.3
7.1
6.8
6.6
6.4
13.3
12.7
12.0
11.4
10.9
10.4
9.9
9.7
9.2
8.8
8.4
8.1
7.8
7.5
7.2
7.1
6.9
6.6
6.4
6.2
13.6
12.9
12.2
11.6
11.0
10.5
10.1
9.6
9.2
8.7
8.5
8.1
7.8
7.5
7.3
7.0
6.8
6.6
6.3
6.2
6.0
900 m
13.2
12.4
11.9
11.2
10.6
10.2
9.7
9.3
8.9
8.6
8.2
7.8
7.5
7.3
7.0
6.8
6.6
6.4
6.1
5.9
5.8
1200 m
12.7
12.0
11.4
10.8
10.3
9.8
9.4
9.0
8.6
8.3
7.9
7.7
7.3
7.0
6.8
6.5
6.4
6.2
5.9
5.7
5.6
1500 m
12.3
11.6
11.0
10.4
9.9
9.5
9.1
8.7
8.3
8.0
7.7
7.3
7.1
6.8
6.6
6.3
6.1
6.0
5.7
5.6
5.4
1800 m
11.8
11.2
10.6
10.1
9.6
9.2
8.8
8.3
8.0
7.7
7.4
7.1
6.8
6.6
6.3
6.1
5.9
5.8
5.5
5.4
5.2
ppm
°F
32.0
35.6
39.2
42.8
46.4
50.0
53.6
57.2
60.8
64.4
68.0
71.6
75.2
78.8
82.4
86.0
89.6
93.2
96.8
100.4
104.4
HI 9143
Press FACTOR twice and “F2”
will be displayed.
Press the UP and DOWN keys
to set the salinity between 0
SAMPLE
ppm
F2
or
and 40 g/L. Press FACTOR
again to display the temperature.
HI 9145
All DO readings refer to 0 g/L of salinity. Salinity
affects the DO concentration by decreasing its
value.
The table below shows the maximum solubility
of oxygen at various temperatures and salinity
levels. By using the table, the quantity to be
subtracted to correct the reading can be
calculated.
Salinity (g/L) at Sea Level
°C
10
12
14
16
18
20
22
24
26
28
0 g/L
11.3
10.8
10.3
9.9
9.5
9.1
8.7
8.4
8.1
7.8
10 g/L
10.6
10.1
9.7
9.3
8.9
8.5
8.2
7.9
7.6
7.4
20 g/L
9.9
9.5
9.1
8.7
8.4
8.0
7.8
7.5
7.2
7.0
30 g/L
9.3
8.9
8.6
8.2
7.9
7.6
7.3
7.1
6.8
6.6
35 g/L
9.0
8.6
8.3
8.0
7.6
7.4
7.1
6.9
6.6
6.4
°F
50.0
53.6
57.2
60.8
64.4
68.0
71.6
75.2
78.8
82.4
12 13
PROBE & MEMBRANE MAINTENANCE
The oxygen probe body is made of reinforced
polypropylene for maximum durability.
A built-in thermistor sensor measures the temperature of the sample. It is recommended to
keep the protective cap on the probe when the
it is not in use.
To replace the membrane or refill it with
electrolyte, proceed as follows:
• Remove the protective
cap by gently twisting and
pulling it off the probe
(fig.1).
• Unscrew the membrane
by turning it counterclock-
TWIST
AND
PULL
wise (fig.2)
• Wet the sensor by soak-
fig. 1
ing the bottom (2.5 cm /
1") of the probe in HI7041S
electrolyte solution for 5
minutes.
• Rinse a new membrane
(HI 76407A) with some
electrolyte while shaking
it gently. Refill with fresh
electrolyte.
• Gently tap the sides of
the membrane with your
finger to ensure that no
air bubbles remain
trapped. Do not directly
tap the bottom as this
may damage the membrane.
• Make sure that the rubber O-ring is seated prop-
UNSCREW
fig. 2
erly inside the membrane
cap.
• With the sensor facing down, screw the
membrane cap clockwise. Some electrolyte will overflow.
The platinum cathode sensor should always be
bright and untarnished. If it is tarnished or
stained, which could be due to contact with
certain gases or extended use with a loose or
damaged membrane, the cathode sensor
should be cleaned.
Use a clean, lint-free cardboard or cloth. Rub the
cathode very gently side to side 4-5 times. This
will be enough to polish and remove any stains
without damaging the platinum tip. Then, rinse
the probe with deionized or distilled water.
Install a new membrane and fill it with fresh
electrolyte following the instructions above.
Recalibrate the instrument.
Important: For accurate and stable measurements, it is important that the surface of the
membrane is in perfect condition. This permeable membrane isolates the sensor elements
from the environment but allows oxygen to
enter. If any dirt is deposited on the membrane,
rinse it carefully with distilled or deionized
water. If any imperfection is observed, or any
damage is evident (such as wrinkles, tears or
holes), the membrane should be replaced. Make
sure that the O-Ring is properly seated in the
membrane cap.
14 15
BATTERY REPLACEMENT
+
-
Use the HANNA adapters (such as HI 710005
or HI 710006) with proper polarity configuration.
When the batteries become
weak, the "LOBAT" indication
appears on the LCD to warn
LOBAT
SAMPLE
ppm
°C
the operator that the display
will be shut-off after about 4 hours of use to
prevent erroneous readings due to low voltage.
Battery replacement must only take place in a
safe area using 1.5V AA alkaline batteries.
In order to replace the
batteries, simply remove
the two screws on the
rear cover of the instrument and replace all four
batteries with new ones,
while paying attention to
the correct polarity.
HI 9143 and HI 9145 can also run on other
adapters. In this case, check the correct polarity of the adapter before connecting it to the
meter.
ACCESSORIES
HI 76407/4 DO probe with 4 m (13') cable
HI 76407/10 DO probe with 10 m (33') cable
HI 76407/20 DO probe with 20 m (66') cable
HI 7041S Refilling electrolyte solution,
30 mL
HI 76407A/P Spare DO membrane (5 pcs)
A 12 Vdc power source can also be used to
power the unit. Simply unscrew the protective
cap on the top of the instrument and plug the
power adapter into the socket.
Note: The instrument uses the following con-
figuration.
16 17
HI 710005 115 Vac/12 Vdc adapter, US
plug
HI 710006 230 Vac/12 Vdc adapter, Eu-
ropean plug
HI 710012 240 Vac/12 Vdc adapter, UK
plug
HI 710013 230 Vac/12 Vdc adapter, South
African plug
HI 710014 230 Vac/12 Vdc adapter, Aus-
tralian plug
WARRANTY
All Hanna meters are warranted for two
years against defects in workmanship and
materials when used for their intended purpose and maintained according to the instructions.
Probes are warranted for 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 charge for
repair or replacement.
If the instrument is to be returned to Hanna
Instruments, please obtain a Return Goods
Authorization from the Customer Service Department and then send it with shipment cost
prepaid. When shipping any instrument, make
sure it is properly packaged for complete protection.
CE DECLARATION OF CONFORMITY
All rights are reserved. Reproduction in whole
or in part is prohibited without the written consent of the copyright owner.
Hanna Instruments reserves the right to modify
the design, construction and appearance of its
products without advance notice.
18 19
Recommendations for Users
Before using these products, make sure that they are entirely
suitable for the environment in which they are used.
Operation of this instrument in residential area could cause
unacceptable interference to radio and TV equipment, requiring the
operator to take all necessary steps to correct interferences.
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
voltage at the measurement surface exceeds 24 Vac or 60 Vdc.
To avoid damage or burns, do not perform any measurement in
microwave ovens.
SALES & TECHNICAL SERVICE
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
MANDOWPR3 09/05
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