Instruction Manual
HI 9143, HI 9143M
HI 9145
Portable Waterproof
Microprocessor
Dissolved Oxygen Meters
SAMPLE
ppm
°C
HI 9143
Microprocessor
Auto Cal
Dissolved
ON/OFF
Oxygen Meter
CAL
RANGE
HOLD
FACTOR
http://www.hannainst.com
These Instruments are in
Compliance with the CE Directives
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, as well as a precise idea of its versatility.
The instrument is in compliance with directives EN 50081-1 and 50082-1.
TABLE OF CONTENTS
Preliminary Examination ............................. 1
General Description ................................... 1
Functional Description - Probe ................... 2
Functional Description - Meter ................... 3
Specifications.............................................4
Probe Preparation ...................................... 5
Calibration .................................................. 6
Measurement ............................................. 8
Altitude Compensation ............................. 10
Salinity Compensation ............................. 11
Probe & Membrane Maintenance............. 12
Battery Replacement ................................ 14
Accessories .............................................. 15
Warranty .................................................. 16
CE Declaration of Conformity .................. 17
ins
rum n
e
s
PRELIMINARY EXAMINATION
Remove the instrument from the packing
material and examine it to make sure that no
damage has occurred during shipping. If there
is any damage, notify your Dealer.
In addition to this manual you should find the
following items:
• D.O. meter
• AA size batteries (4 each)
• DO Probe with 4m (13’) cable (HI 76407/4)
• (2) PTFE Membranes (HI 76407A)
• Protective cap
• 30 mL electrolyte solution (HI 7041S)
• 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.
GENERAL DESCRIPTION
The Hanna HI 9143 and HI 9145 are waterresistant, microprocessor-based, autocalibration Dissolved Oxygen meters with ATC.
They have been developed for dissolved
oxygen and temperature measurement in
water and wastewater as well as other
applications such as fish farming.
Dissolved oxygen is indicated in hundredths
of parts per million (ppm=mg/L) or in % of
saturation.
The temperature range is indicated in
centigrade from 0 to 50°C with 0.1°C resolution.
The ppm and the % saturation are both
compensated for changes in solubility of oxygen
in water and for permeability of the membrane
as well as the temperature effect.
Salinity compensation in water allows
determination of mg/L of dissolved oxygen in
1
salty waters and the altitude compensation
readjusts for the altitude variance (HI 9143 only).
Four 1.5V AA alkaline batteries provide power
and make the instrument completely portable.
HI 9143 and HI 9145 are also designed to be
used with a battery recharger or a 12VDC
power supply. A 12VDC input jack is
incorporated into the housing.
A microprocessor ensures an accurate and
rapid calibration and measurement. The case
rugged and water-resistant for maximum
protection in the field as well as in the laboratory.
The dissolved oxygen probe has 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
1. D.O. Probe
2. Protective Cap
3. Watertight Shielded
Cable
4. Polypropylene Probe
Body
5. Temperature Sensor
6. O-Ring Seal
7. Silver Chloride Anode
(sensor element)
8. Platinum Cathode
(sensor element)
9. Oxygen Permeable
PTFE Membrane
10.Protective Cap
6
7
8
9
2
3
4
4
5
6
7
8
9
1
2
10
FUNCTIONAL DESCRIPTION
210
1
SAMPLE
3
4
ON/OFF
CAL
67
FACTOR
HI 9143
Microprocessor
Auto Cal
Dissolved
Oxygen Meter
RANGE
ppm
°C
HOLD
2
19
LOBAT
20
SAMPLE
HOLD
21
9
85
CAL
22
ppm
%
F1
F2
°C
1) Battery Compartment
2) Probe Connector
3) Liquid Crystal Display
4) ON/OFF Button
5) CAL Button (to enter or exit calibration mode)
6) FACTOR button (to select altitude F1
and salinity F2)*
7) UP and DOWN arrow keys (to select F1
and F2 levels)*
8) HOLD key (to freeze displayed value)
9) RANGE button (to select ppm or % of
saturation)
10) Power Jack for 12VDC adapter
19) LOW BAT indicator
20) SAMPLE indicator (to indicate the measurement mode)
21) F1 indicator (altitude factor) *
22) F2 indicator (salinity factor) *
23) % or ppm mode indicator
24) Temperature (and factor*) display
* Note: HI 9143 only.
10
23
24
3
SPECIFICATIONS HI 9143 AND HI 9145
HI 9143 HI 9145
Range 0.00 to 45.00
0.0 to 300 %O
mg/L O
2
2
0.0 to 50.0 °C
Resolution
0.01 mg/L O
0.1 %O
2
2
0.1 °C
Accuracy ±1.5% Full Scale mg/L O
(@25°C/77°F) ±1.5% Full Scale %O
2
2
±0.5 °C
EMC ±0.3 mg/L O
Typical ±3.5 %O
2
2
Deviation ±0.5 °C
Calibration Automatic in saturated air
Temperature Automatic from 0 to 50°C
Compensation (32 to 122°F)
Altitude 0 to 1900 m -------
Compensation* 100 m resolution -------
Salinity 0 to 40 g/L -------
Compensation* 1 g/L resolution -------
Operating From 0 to 50°C (32 to 122°F)
Conditions Humidity: 100% maximum
Battery 4x1.5V AA, 200 hours continuous
use. Auto shut-off after 4 hours.
Power plug for 12VDC supply
Dimensions L x W x H: 196 x 80 x 60mm
(7.7 x 3.1 x 2.4")
Shipping 425 g (15 oz.)
Weight Kit: 1.4 Kg (3.1 lb.)
* For HI 9143M, 0.0 to 4.0 Km with 0.1Km
resolution and 0 to 80 g/L with 1 g/L resolution
4
PROBE PREPARATION
All probes are shipped dry by Hanna Instruments. To hydrate the probe and prepare it
for use, connect it to the meter and proceed
as follows.
1 Remove the red and black plastic cap
which is for shipping purposes
and can be discarded.
Shipping
cap
2 Wet the sensor by soaking the
bottom 2½ cm (1") of the probe
in electrolyte (HI 7041S) for 5
black
minutes.
3 Take a membrane (HI 76407A
red
supplied with the meter) and
Make sure that
the rubber O-ring
sits properly inside the membrane cap.
4 Rinse the
menbrane with
electrolyte while
shaking it gently.
Refill with clean
electrolyte.
SECOND
FILL
THIRD
TAP
FIRST
INSERT
O’RING
5 Gently tap the
sides of the
membrane cap
with your finger
tip to ensure that
THEN SCREW
BACK ON
no air bubbles remain trapped. To avoid
damaging to the membrane, do not tap
the membrane directly on the bottom.
6 With the sensor facing down, screw the
cap clockwise. Some electrolyte will overflow.
When not in use, protect the
menbrane by placing the protective cap on it.
5
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. Whenever measurements
are taken with a non-polarized probe, the
oxygen level indicated is that of the test solution as well as any oxygen present in the
electrolyte solution. This reading is obviously
incorrect. The Hanna oxygen meter shown
here automatically polarize the probe when
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 5), i.e. the membrane is
filled with electrolyte and probe is connected to the meter and
properly polarized.
• Switch the meter on.
• "COND" appears on the
display to inform you that
ON/OFF
the probe is in auto-conditioning (automatic polarization) mode.
• Once "COND" disappears
the probe is polarized and instrument can
be calibrated.
6
• For an accurate calibration, it is recommended to wait an additional 5 or 10 minutes to ensure optimum conditioning of the
probe.
• Remove the protective cap.
• Press CAL. "----" appears
on the larger LCD together
with "CAL" to indicate that
the instrument is in calibra-
CAL
tion mode.
• The instrument will automatically standardize itself
CAL
to the actual saturation
value. After approx. 1
minute it will show "100%"
on the LCD and a small
SAMPLE
%
°C
"SAMPLE" to indicate that
the calibration is complete.
•
HI 9143 only: press FACTOR and ensure
F1 and F2 are set to the appropriate altitude
and salinity values (pages 10-11).
Notes:• The instrument must be calibrated
whenever the probe, membrane
or the electrolyte is changed.
• To exit the calibration mode during
calibration, press
CAL.
• The display may be
switched from readings in % saturation to
CAL
mg/L without
recalibration, by simply pressing RANGE.
RANGE
7
MEASUREMENT
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 and
ensure 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 statinary.
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 an accurate measurement, allow sufficient time for thermal equilibrium between the
probe and the measurement sample (a few
minutes if the temperature difference is several degrees).
mg/L READINGS
The mg/L readings make it possible to read the
concentration of the dissolved oxygen directly
in ppm.
8
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 - see below).
With HI 9143, set the altitude and/or the
salinity before calibration and taking mg/L
measurements. The meter will automatically
compensate for these factors.
With HI 9145, the readout is at sea level and
for liquids without any salt content.
% O2 SATURATION READINGS
The % O2 reading provides the rate of
oxygen saturation with reference to 100.0%
at sea level.
TEMPERATURE READINGS
The lower part of the display
will show the measured
temperature in Celsius
degrees.
SAMPLE
%
°C
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.
9
ALTITUDE COMPENSATION
HI 9143
Press FACTOR and “F1” will
be displayed. Use the UP and
the DOWN keys to set the
altitude from 0 and 1900 m, in
steps of 100 m. (With HI 9143M
SAMPLE
FACTOR
ppm
F1
the altitude can be set from 0.0
to 4.0 Km, in steps of 0.1 Km).
or
HI 9145
With HI 9145, all the D.O. readouts are
referenced to sea level. Altitude affects D.O.
concentration decreasing its value. The
following table reports the maximum oxygen
solubility at various temperatures and altitudes.
°C
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
Altitude above Sea Level (in meters)
0 m
300 m
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
°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
10
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.
SALINITY COMPENSATION
HI 9143
Press FACTOR twice and “F2”
will be displayed. Press UP
and DOWN to set the salinity
between 0 and 40 g/L (0 to 80
g/L for HI 9143M). Press
FACTOR again to display the
SAMPLE
FACTOR
ppm
F2
or
temperature.
HI 9145
All D.O. readouts are referred to 0 g/L of
salinity. Salinity affects D.O. 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.
°C
10
12
14
16
18
20
22
24
26
28
Salinity (g/L) at Sea Level
0 g/L
10 g/L
20 g/L
11.3
10.6
10.1
9.7
9.3
8.9
8.5
8.2
7.9
7.6
7.4
9.9
9.5
9.1
8.7
8.4
8.0
7.8
7.5
7.2
7.0
10.8
10.3
9.9
9.5
9.1
8.7
8.4
8.1
7.8
11
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
PROBE & MEMBRANE MAINTENANCE
The oxygen probe body is made of reinforced
polypropylene for maximum durability.
A thermistor sensor measures temperature of
the sample. It is recommended that the protective cap be always kept on the probe when the
probe 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 (see fig. 1).
• Unscrew the membrane
by turning it counterclockwise (see fig.2)
• Wet the sensor by soaking the bottom 2½ cm
(1") of the probe in electrolyte (HI 7041S) for 5
TWIST
AND
PULL
fig. 1
minutes.
• Rinse a new membrane
(HI 76407A) with electrolyte while shaking it
gently. Refill with clean
electrolyte.
• Gently tap the sides of
the membrane with your
finger tip to ensure that
no air bubbles remain
trapped. Do not directly
tap the bottom as this
may cause irreparable
damage to the membrane.
12
UNSCREW
fig. 2
• Make sure that the rubber O-ring is seated
properly inside the membrane cap.
• With the sensor facing down, screw the
membrane cap clockwise. Some electrolyte will overflow.
The Platinum cathode sensor (#8 in the Functional Description on page 2) 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: In order to have 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 imperfections
are 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.
13
BATTERY REPLACEMENT
When the batteries are run
down "LOBAT" is displayed
on the Liquid Crystal Dis-
LOBAT
SAMPLE
ppm
°C
play.
This is to inform the user that the display will
be shut-off after about 4 hours of use to
prevent erroneous measurements due to low
voltage.
Battery replacement must only take place in a
non-hazardous area using alkaline batteries.
In order to replace run down batteries, simply
remove the two screws
on the rear cover of the
instrument (#1 in the
Functional Description on
page 3) and replace the
four 1.5V AA batteries
with new ones, paying attention to the correct polarity.
A 12VDC power source
can also be used to power
the unit (see accessories).
Simply unscrew the protective cap on the top of
the instrument (#10 page
3) and plug the power sup-
ply into the socket.
Note: The instrument uses the following con-
figuration.
+
14
-
Use only the Hanna voltage adapters (such as
HI 710005 or HI 710006 - see below) with
proper polarity configuration.
HI 9143 and HI 9145 can however also run on
other adapters. In this case, check the correct
polarity of your adapter before connecting it to
the meter.
ACCESSORIES
HI 740027 1.5V AA battery (4 pieces)
HI 7041S Refilling Electrolyte Solution,
30 mL
HI 76407/10 Spare probe with 10 meters
(33') cable
HI 76407/20 Spare probe with 20 meters
(66') cable
HI 76407A/P 5 spare membranes
HI 710005 115 VAC to 12 VDC, US plug
HI 710006 230 VAC to 12 VDC, Euro-
pean plug
HI 710012 240 VAC to 12 VDC, UK plug
HI 710013 230 VAC to 12 VDC, S.
Affrican plug
HI 710014 230 VAC to 12 VDC, Austra-
lian plug
15
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. The 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 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.
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 reserves the right to
modify the design, construction and appearance of its products without advance notice.
16
CE DECLARATION OF CONFORMITY
DECLARATION OF CONFORMITY
We
Hanna Instruments Srl
V.le delle industrie 12
35010 Ronchi di Villafranca (PD)
ITALY
herewith certify that the waterproof dissolved oxygen meters
have been tested and found to be in compliance with the following regulations:
IEC 801-2 Electrostatic Discharge
IEC 801-3 RF Radiated
IEC 801-4 Fast Transient
EN 55022 Radiated, Class B
HI 9143 HI 9145
Date of Issue: 11-10-1995
D.Volpato - Engineering Manager
On behalf of
Hanna Instruments S.r.l.
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 24VAC or 60VDC.
To avoid damage or burns, do not perform any measurement in microwave ovens.
17
HANNA LITERATUREHANNA LITERATURE
HANNA LITERATURE
HANNA LITERATUREHANNA LITERATURE
Hanna publishes a wide range of catalogs and handbooks for an equally wide range of applications.
The reference literature currently covers areas such
as:
• Water Treatment
• Process
• Swimming Pools
• Agriculture
• Food
• Laboratory
• Thermometry
and many others. New reference material is constantly being added to the library.
For these and other catalogs, handbooks and leaflets, contact your dealer or the Hanna Customer
Service Center nearest to you. To find the Hanna
Office in your vicinity, check our home page at
www.hannainst.com.
PRINTED IN PORTUGAL
http://www.hannainst.com
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