Instruction Manual
HI 8043
Portable
Dissolved Oxygen Meter
DO meter
HI 8043
STB
OFF
°C
O
2
ZERO
SLOPE
ins
rum
°C
n
s
1
PRELIMINARY EXAMINATION
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 neces-
sary information for the correct use of the
instrument.
If you need additional technical information,
do not hesitate to e-mail us at
tech@hannainst.com
This instrument is in compliance with the CE
directives.
TABLE OF CONTENTS
Preliminary Examination............................. 3
General Description .................................... 3
Functional Description (Probe) ................... 4
Functional Description (Meter).................... 5
Specifications ............................................. 6
Probe Initial Preparation ............................. 7
Dissolved Oxygen Calibration ..................... 9
Temperature Calibration ............................ 15
Taking Measurements .............................. 1 6
Probe & Membrane Maintenance ............. 17
Battery Replacement ................................ 19
Accessories.............................................. 20
Warranty ................................................... 21
CE Declaration of Confirmity .................... 22
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 76401 DO probe
• Spare membrane with O-ring (2 pcs)
• Protective cap
• HI 7041S electrolyte solution (30 mL)
• Calibration screwdriver
• 9V battery (1 pc)
• Instructions
Note: Save all packing material until you are
sure that the instrument functions
correctly. All defective items must be
returned in the original packaging with
the supplied accessories.
GENERAL DESCRIPTION
HI 8043 is a portable meter for Dissolved
Oxygen measurements.
It is housed in a lightweight case, with an
easy-to-read LCD.
Dissolved oxygen and temperature measurements can be performed in the field (wastewater treatment, fish-farming, water analysis,
etc.) as well as in the laboratory without
compromising accuracy.
Dissolved oxygen is indicated in mg/L (ppm)
and the reading is compensated for the temperature effect (ATC).
The dissolved oxygen probe is provided with
a membrane for covering the polarographic
sensors, and features a built-in thermistor for
temperature measurements and compensation.
2
3
The thin permeable membrane isolates the
sensor elements from the sample, but allows
oxygen to enter.
A voltage is applied across the sensor, and
the oxygen that has passed through the membrane reacts causing the current to flow, hence
determining a reading.
A convenient feature of the instrument is its
standby mode which keeps the probe polarized
and ready for instant measurements.
FUNCTIONAL DESCRIPTION (METER)
1
FUNCTIONAL DESCRIPTION (PROBE)
1. D.O. Probe
2. Protective Cap
3. Watertight Shielded Cable
4. Probe Body
5. O-Ring Seal
6. Silver Chloride Anode
7. Platinum Cathode (sensor)
8. Oxygen Permeable Membrane
9. Membrane Cap
3
DO meter
STB
OFF
HI 8043
°C
O
2
42
5
9
6
7
ZERO SLOPE °C
8
s
ins
rum n
1. Liquid Crystal Display
2. "OFF" (to switch the meter off)
3. "STB" (to switch the meter on and polarize
the probe. Use this standby position without switching the meter off if you are
going to take further measurements)
4. "°C" Measurement
5. "O2" Measurement
6. ZERO Calibration Trimmer
7. SLOPE Calibration Trimmer
8. °C Calibration Trimmer
9. Rotary Switch
4
5
SPECIFICATIONS
PROBE INITIAL PREPARATION
Range 0.00 to 19.99 mg/L O
0.0 to 50.0°C (32 to 122 °F)
Resolution 0.01 mg/L O
0.1°C
Accuracy ±1.5% F.S. (O2)
±0.5°C
Typical EMC ±1.5% F.S. (O2)
Deviation ±1°C
Calibration Manual, 2 point (zero and slope)
Temperature Automatic, 0 to 30°C
Compensation (32 to 86°F)
Probe HI 76401 polarographic
with 3 m (10') cable (included)
Battery Type 1 x 9V
Life approx. 100 hours of continuous use
Environment 0 to 50°C (32 to 122°F); RH max 95%
Dimensions 180 x 83 x 40 mm (7.1 x 3.3 x 1.6")
Weight 240 g (8.4 oz.)
2
2
PROBE PREPARATION
All DO 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
Shipping
cap
plastic cap. This cap is
only used for protecting the
black
probe during shipment, and
can be thrown away.
red
2. Wet the sensor by soaking the bottom
(2.5 cm/1") of the probe in HI 7041S electrolyte solution for 5 minutes.
3. Rinse the supllied membrane (HI 76407A)
with some electrolyte while shaking it gently. Refill with clean electrolyte.
4. Gently tap the sides of the
membrane with your finger
tip to ensure that no air
bubbles remain trapped inside. To avoid damaging
the membrane, 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 the probe is not used,
protect the membrane with the
supplied cap.
6
7
PROBE POLARIZATION
When the probe is under polarization it is
continuously fed with a voltage of approximately 800 mV.
Probe polarization is essential for stable measurements to be taken with the same degree
of accuracy.
With polarized probe, oxygen is continually
"consumed" by passing through the sensitive
diaphragm and dissolving in the electrolyte
solution contained in 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.
If measurements are taken with a non-polarized probe, the oxygen level detected by the
meter is the sum of the oxygen dissolved in
the tested sample and that of the electrolyte
solution itself.
STB
By leaving the instrument in
the "STB" mode (i.e. keep-
OFF
°C
O
ing the probe in a continual
state of polarization), the oxygen of the electrolyte solution is progressively "consumed", and the following measurements detect only the quantity of oxygen dissolved in
the sample to be tested.
Therefore, in order to keep the probe continuously polarized it is necessary to switch the
meter to the "STB" mode and wait for at least
30 minutes. This should be done with the
probe covered with the protective cap and
filled with some electrolyte solution.
Polarization is not maintained
when the instrument is
OFF
STB
°C
O
switched OFF.
DISSOLVED OXYGEN CALIBRATION
The calibration should be verified:
• after approximately 20 hours of use
• whenever the electrolyte or membrane is
changed and after cleaning the electrode
• after use in aggressive solutions.
Accessories:
• 200 cc of HI 7040 solution
• 1 bottle of HI 7041 solution
Calibration at sea level:
• Switch the meter ON, set
the knob to the "STB"
OFF
STB
°C
O
2
position and wait 30 minutes for a complete polarization of the probe.
2
ZERO CALIBRATION
• Switch from "STB" to "O2"
position.
OFF
STB
°C
O
2
• Remove the membrane
protective cap, immerse
the probe in HI 7040 zero
oxygen solution and wait
for approx. 5 minutes.
• The indications given by the instrument
must fall to stabilization levels. If the probe
has not been sufficiently polarized, the
readout will continue to fluctuate.
In this case, switch back
to "STB" position, place
OFF
STB
°C
O
2
the protective cap and
2
wait for a few hours for
complete polarization before proceeding.
8
9
• Using a small screwdriver, turn the "Zero"
SLOPE
ZERO
°C
calibration trimmer until the display reads
zero.
ZERO
SLOPE
°C
• If the zero point is
passed, "1" will appear
on the display.
If you cannot get zero reading, the probe
is probably defective. Check the membrane, electrode and electrolyte solution.
After the zero calibration has been completed,
rinse the probe thoroughly with tap water.
SLOPE CALIBRATION
In order to perform a highly
accurate calibration, take a
B.O.D. bottle and fill with
water to a depth of 1-2 cm
(½ - ¾"). Seal the bottle with
the probe inside.
If this calibration is carried out with the bottle
opened to air rather than according to the
conditions described above, the margin of
error is approximately 0.1 ppm.
• Switch the instrument to
"°C", wait for reading to
OFF
STB
°C
O
stabilize and note the
temperature of the water.
• See Table 1 on page 12
for the DO reading corresponding at the noted
STB
temperature.
• Switch to "O2" position
OFF
°C
O
and adjust the "Slope"
trimmer until the correct
reading is displayed.
E.g. at 20.5°C the trimmer should be adjusted to read 9.08.
ZERO
SLOPE
°C
ALTITUDE COMPENSATION
If the calibration is not performed at sea level,
a correction should be made for the altitude
effect according to Table 2 on page 13.
E.g. at 20.5°C and at an altitude of 300 m
above sea level, the "Slope" trimmer should
be adjusted to read 9.08 x 0.96 = 8.72.
SALINITY COMPENSATION
An additional correction has to be performed
if the sample presents significant salinity concentrations. In such case, the reading has to
be adjusted according to Table 3 on page 14.
E.g. at 20.5°C and if the sample has a salinity content of 3 g/L, the "Slope" trimmer
should be adjusted to read 9.08 - (3 x 0.0478)
= 8.94.
2
ZERO
SLOPE
°C
2
10
11
Table 1
Dissolved Oxygen (ppm) in Fresh Water
as a function of Temperature (°C)
Table 2
Correction for measurements
at different altitude
°C
0.0
0.1
0.2
0
14.62
14.58
1
14.23
14.19
2
13.84
13.80
3
13.48
13.45
4
13.13
13.10
5
12.80
12.77
6
12.48
12.45
7
12.17
12.14
8
11.87
11.84
9
11.59
11.33
11.08
10.83
10.60
10.37
10.15
9.95
9.74
9.54
9.35
9.17
8.99
8.83
8.68
8.53
8.38
8.22
8.07
7.92
7.77
7.63
7.50
7.40
7.30
7.20
7.10
7.00
6.90
6.80
6.70
6.60
6.50
6.40
6.30
6.20
6.10
6.00
5.90
5.80
5.70
5.60
11.56
11.31
11.06
10.81
10.58
10.35
10.13
9.93
9.72
9.52
9.33
9.15
8.97
8.82
8.67
8.52
8.36
8.21
8.06
7.91
7.76
7.62
7.49
7.39
7.29
7.19
7.09
6.99
6.89
6.79
6.69
6.59
6.49
6.39
6.29
6.19
6.09
5.99
5.89
5.79
5.69
5.59
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
14.54
14.15
13.77
13.41
13.06
12.74
12.42
12.11
11.81
11.54
11.28
11.03
10.78
10.55
10.33
10.11
9.91
9.70
9.50
9.31
9.13
8.96
8.80
8.65
8.50
8.35
8.19
8.04
7.89
7.74
7.60
7.48
7.38
7.28
7.18
7.08
6.98
6.88
6.78
6.68
6.58
6.48
6.38
6.28
6.18
6.08
5.98
5.88
5.78
5.68
5.58
0.3
14.50
14.11
13.73
13.38
13.03
12.70
12.39
12.08
11.79
11.51
11.26
11.01
10.76
10.53
10.30
10.09
9.89
9.68
9.48
9.30
9.12
8.94
8.79
8.64
8.49
8.33
8.18
8.03
7.88
7.73
7.59
7.47
7.37
7.27
7.17
7.07
6.97
6.87
6.77
6.67
6.57
6.47
6.37
6.27
6.17
6.07
5.97
5.87
5.77
5.67
5.57
0.4
14.46
14.07
13.70
13.34
13.00
12.67
12.36
12.05
11.76
11.49
11.23
10.98
10.74
10.51
10.28
10.07
9.87
9.66
9.46
9.28
9.10
8.93
8.77
8.62
8.47
8.32
8.16
8.01
7.86
7.71
7.58
7.46
7.36
7.26
7.16
7.06
6.96
6.86
6.76
6.66
6.56
6.46
6.36
6.26
6.16
6.06
5.96
5.86
5.76
5.66
5.56
0.5
14.43
14.03
13.66
13.31
12.97
12.64
12.33
12.02
11.73
11.46
11.21
10.96
10.72
10.49
10.26
10.05
9.84
9.64
9.44
9.26
9.08
8.91
8.76
8.61
8.46
8.30
8.15
8.00
7.85
7.70
7.57
7.45
7.35
7.25
7.15
7.05
6.95
6.85
6.75
6.65
6.55
6.45
6.35
6.25
6.15
6.05
5.95
5.85
5.75
5.65
5.55
0.6
14.39
14.00
13.62
13.27
12.93
12.61
12.29
11.99
11.70
11.43
11.18
10.93
10.69
10.46
10.24
10.03
9.82
9.62
9.43
9.24
9.06
8.89
8.74
8.59
8.44
8.28
8.13
7.98
7.83
7.69
7.55
7.44
7.34
7.24
7.14
7.04
6.94
6.84
6.74
6.64
6.54
6.44
6.34
6.24
6.14
6.04
5.94
5.84
5.74
5.64
5.54
0.7
14.35
13.96
13.59
13.24
12.90
12.58
12.26
11.96
11.67
11.41
11.16
10.91
10.67
10.44
10.22
10.01
9.80
9.60
9.41
9.22
9.04
8.88
8.73
8.53
8.53
8.27
8.12
7.97
7.82
7.67
7.54
7.43
7.33
7.23
7.13
7.03
6.93
6.83
6.73
6.63
6.53
6.43
6.33
6.23
6.13
6.03
5.93
5.83
5.73
5.63
5.53
0.8
14.31
13.92
13.55
13.20
12.87
12.54
12.23
11.93
11.65
11.38
11.13
10.89
10.65
10.42
10.19
9.99
9.78
9.58
9.39
9.21
9.03
8.86
8.71
8.56
8.41
8.25
8.10
7.95
7.80
7.66
7.53
7.42
7.32
7.22
7.12
7.02
6.92
6.82
6.72
6.62
6.52
6.42
6.32
6.22
6.12
6.02
5.92
5.82
5.72
5.62
5.52
0.9
14.27
13.88
13.52
13.17
12.83
12.51
12.20
11.90
11.62
11.36
11.11
10.85
10.62
10.39
10.17
9.97
9.76
9.56
9.37
9.19
9.01
8.85
8.70
8.55
8.40
8.24
8.09
7.94
7.79
7.64
7.51
7.41
7.31
7.21
7.11
7.01
6.91
6.81
6.71
6.61
6.51
6.41
6.31
6.21
6.11
6.01
5.91
5.81
5.71
5.61
5.51
ALTITUDE
(METERS)
Sea level
50
100
150
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
ATMOSPHERIC
PRESSURE
KPa
101.3
100.7
100.1
99.4
98.8
97.6
96.4
95.2
94.0
92.8
91.7
90.5
89.4
88.3
87.2
86.1
85.0
84.0
82.9
81.9
80.9
79.9
CORRECTION
FACTOR
1.00
0.99
0.99
0.98
0.98
0.96
0.95
0.94
0.93
0.92
0.90
0.89
0.88
0.87
0.86
0.85
0.84
0.83
0.82
0.81
0.80
0.79
12
13
Correction for salinity effect
SLOPE
ZERO
°C
Quantity to be
°C
subtracted per mg/l
of NaCl
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
0.0892
0.0861
0.0830
0.0802
0.0779
0.0749
0.0724
0.0701
0.0678
0.0657
0.0637
0.0618
0.0599
0.0582
0.0565
0.0549
0.0533
0.0519
0.0505
0.0491
0.0478
0.0466
0.0454
0.0442
0.0431
0.0421
Table 3
°C
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Quantity to be
subtracted per mg/l of
NaCl
0.0410
0.0400
0.0391
0.0382
0.0373
0.0364
0.0356
0.0348
0.0341
0.0333
0.0326
0.0319
0.0312
0.0306
0.0299
0.0293
0.0287
0.0281
0.0275
0.0270
0.0265
0.0259
0.0254
0.0249
0.0244
TEMPERATURE CALIBRATION
The temperature scale should be calibrated
at least every 3 months or whenever the
readings are in doubt.
• Immerse the bottom
60 mm (2.4") of the probe
in a beaker containing water.
• Switch the knob to the
"°C" position and agitate
OFF
STB
°C
O
2
the water for at least 10
minutes to reach the thermal equilibrium between the
probe and water.
• Using a
ChecktempC
or
°C
another thermometer with
a resolution of 0.1°C,
check the temperature
of the water (e.g. 20.0°C).
• Adjust the "°C" trimmer until the display
shows the noted temperature.
Note: It is important to ensure the thermal
equilibrium between probe and water,
because 1 degree of temperature
difference entails an error of ±3% in
dissolved oxygen measurement.
14
15
TAKING MEASUREMENTS
PROBE & MEMBRANE MAINTENANCE
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.
For accurate dissolved oxygen
measurements a water movement of at least 0.3 m/sec is
required.
This movement will ensure that the oxygendepleted membrane surface is constantly replenished. A moving stream will provide adequate circulation.
To quickly check if the water speed is sufficient, wait for stable reading and then move
the D.O. probe. If the reading remains stable,
measurement conditions are correct. If the
reading increases, the water movement is too
low.
During field measurements, this condition may
be met by manually agitating the probe. Accurate readings are not possible while the
liquid is at rest.
During laboratory measurements, the use of
a magnetic stirrer is recommended. In this
way errors due to the diffusion of ambient
oxygen in the solution are minimized.
Anyway, the time necessary for reaching the
thermal equilibrium between probe and sample
must be allowed (a few minutes for a temperature difference of several degrees).
The D.O. probe body is made of reinforced
plastic for maximum durability.
A thermistor temperature sensor provides temperature measurements and compensation.
When not in use, it is always recommended
to protect the probe against damage and dirt
with the supplied cap.
To replace the membrane or refill it with
electrolyte, proceed as follows:
• Remove the protective
cap by gently twisting
and pulling it as sshown
in figure 1.
• Unscrew the membrane
by turning it counterclockwise (see fig.2)
TWIST
AND
PULL
fig. 1
• Wet the sensor by
soaking the bottom (2.5
cm / 1") of the probe in
HI 7041S electrolyte
solution for 5 minutes.
• Rinse the new mem-
brane (HI 76407A, sup-
plied with the meter)
with some electrolyte
while shaking gently.
Refill with clean electrolyte.
• Gently tap the sides of
the membrane with your
finger to ensure that no
air bubbles remain
trapped inside. Do no
directly tap the bottom
as this will damage the
membrane.
• Make sure that the rubber O-ring is seated
properly inside the membrane cap.
16
17
• With the sensor facing down, screw the
membrane cap clockwise. Some electrolyte will overflow.
BATTERY REPLACEMENT
The Platinum cathode (#8 in the Functional
Description at page 4) 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 should be
cleaned. Use a lint-free cardboard or cloth
and 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. Afterwards, rinse the probe with
deionized or distilled water and install a new
membrane cap using fresh electrolyte.
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 semi-permeable membrane isolates
the sensor elements from the environment
but allows oxygen to enter. If any dirt is
observed on the membrane, rinse carefully
with distilled or deionized water. If any imperfection still exists, or any damage is evident
(such as wrinkles or tears), the membrane
should be replaced. Make sure that the ORing is properly seated in the membrane
cap.
When the battery level is
low, a "V" will be displayed
V
to warn the user that the
battery should be replaced.
The meter will still work for approximately 4
hours, then the display will be shut-off to
avoid erroneous readings.
Battery replacement must only take place in
a safe area and using the battery type specified in this instruction manual.
Slide off the battery cover on the rear of the
meter and replace the 9V battery with a new
one.
18
BATTERY
19
ACCESSORIES
WARRANTY
HI 7040M Zero oxygen solution, 230 mL
HI 7040L Zero oxygen solution, 500 mL
HI 7041S Refilling electrolyte solution,
30 mL
HI 710001 Soft carrying case
HI 710009 Shockproof rubber boot, blue
HI 710010 Shockproof rubber boot, orange
HI 76401 D.O. probe with 3 m (10') cable
HI 76407A/P Spare membrane (5 pcs)
All Hanna Instruments meters are warranted
for two years against defects in workman-
ship and materials when used for their intended purpose and maintained according to
the instructions. The probes are warranted
for a period of six months.
Damages due to accident, misuse, tampering or lack of prescribed maintenance are not
covered. This warranty is limited to repair or
replacement free of charge.
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, obtain a
Return Goods Authorization from the Customer Service Department first and then send
it with shipment cost prepaid. When shipping
any instrument, make sure it is properly packaged for complete protection.
20
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 appear-
ance of its products without advance notice.
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CE DECLARATION OF CONFORMITY
Recommendations for Users
Before using this product, make sure that it is entirely suitable for the environment
in which it is used.
Operation of this instrument in residential area could cause unacceptable interferences to radio and TV equipments, 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 damages or burns, do not perform any measurement in microwave ovens.
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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
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MAN8043R2 08/05
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