Hanna Instruments HI 8043 Manuale utente

Instruction Manual

HI 8043

Portable

Dissolved Oxygen Meter

ins

rum ns

OFF O

STB

°C

DO meter

HI 8043

ZERO SLOPE °C

PRELIMINARY EXAMINATION

Remove the instrument from the packing ma-

terial 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 measure-

ments can be performed in the field (waste-

water 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 tem-

perature 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 compensa-

tion.

DearCustomer,

Thank you for choosing a Hanna Instruments

Product.

Please read this instruction manual carefully

beforeusingtheinstrument.

Thismanualwillprovideyouwithalltheneces-

sary information for the correct use of the

instrument.

If you need additional technical information,

do not hesitate to e-mail us at

[email protected]

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 .............................. 16

Probe & Membrane Maintenance ............. 17

Battery Replacement ................................ 19

Accessories.............................................. 20

Warranty ................................................... 21

CE Declaration of Confirmity .................... 22

FUNCTIONAL DESCRIPTION (METER)

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 with-

out 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

ins

rum ns

OFF O

STB

°C

DO meter

HI 8043

ZERO SLOPE °C

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 mem-

brane reacts causing the current to flow, hence

determining a reading.

A convenient feature of the instrument is its

standbymodewhichkeepstheprobepolarized

andreadyforinstantmeasurements.

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

PROBE INITIAL PREPARATION

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

plastic cap. This cap is

only used for protecting the

probe during shipment, and

can be thrown away.

2. Wet the sensor by soaking the bottom

(2.5 cm/1") of the probe in HI 7041S elec-

trolyte solution for 5 minutes.

3. Rinse the supllied membrane (HI 76407A)

with some electrolyte while shaking it gen-

tly. Refill with clean electrolyte.

4. Gently tap the sides of the

membrane with your finger

tip to ensure that no air

bubbles remain trapped in-

side. 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 clock-

wise. Some electrolyte will

overflow.

When the probe is not used,

protect the membrane with the

supplied cap.

Shipping

cap

black

red

SPECIFICATIONS

Range 0.00 to 19.99 mg/L O2

0.0 to 50.0°C (32 to 122 °F)

Resolution 0.01 mg/L O2

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.)

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"

position and wait 30 min-

utes for a complete polar-

ization of the probe.

ZERO CALIBRATION

• Switch from "STB" to "O2"

position.

• 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

the protective cap and

wait for a few hours for

complete polarization be-

fore proceeding.

OFF O

STB

°C

OFF O

STB

°C

PROBE POLARIZATION

When the probe is under polarization it is

continuously fed with a voltage of approxi-

mately 800 mV.

Probe polarization is essential for stable mea-

surements 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 oxy-

gen until it reaches an equilibrium with the

surrounding solution.

If measurements are taken with a non-polar-

ized 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.

By leaving the instrument in

the "STB" mode (i.e. keep-

ing the probe in a continual

state of polarization), the oxy-

gen of the electrolyte solu-

tion is progressively "con-

sumed", and the following measurements de-

tect only the quantity of oxygen dissolved in

the sample to be tested.

Therefore, in order to keep the probe continu-

ously 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

switched OFF.

OFF O

STB

°C

OFF O

STB

°C

OFF O

STB

°C

E.g. at 20.5°C the trimmer should be ad-

justed to read 9.08.

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 con-

centrations. 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 salin-

ity content of 3 g/L, the "Slope" trimmer

should be adjusted to read 9.08 - (3 x 0.0478)

= 8.94.

OFF O

STB

°C

• Using a small screwdriver, turn the "Zero"

calibration trimmer until the display reads

zero.

• 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 mem-

brane, 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

stabilize and note the

temperature of the water.

• See Table 1 on page 12

for the DO reading corre-

sponding at the noted

temperature.

• Switch to "O2" position

and adjust the "Slope"

trimmer until the correct

reading is displayed.

OFF O

STB

°C

SLOPE

ZERO °C

SLOPE

ZERO °C

SLOPE

ZERO °C

SLOPE

ZERO °C

Table 2

Correction for measurements

at different altitude

Table 1

Dissolved Oxygen (ppm) in Fresh Water

as a function of Temperature (°C)

°C

ALTITUDE

(METERS)

Sea level

100

150

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

1800

1900

CORRECTION

FACTOR

1.00

0.99

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

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

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

0.0

14.62

14.23

13.84

13.48

13.13

12.80

12.48

12.17

11.87

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

0.1

14.58

14.19

13.80

13.45

13.10

12.77

12.45

12.14

11.84

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

0.2

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

0.6

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

8.27

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

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 wa-

ter.

• Switch the knob to the

"°C" position and agitate

the water for at least 10

minutes to reach the ther-

mal equilibrium between the

probe and water.

• Using a

ChecktempC

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.

TEMPERATURE CALIBRATION

OFF O

STB

°C

Table 3

Correction for salinity effect

°C

Quantity to be

subtracted per mg/l

of NaCl

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

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

°C

SLOPE

ZERO °C

PROBE & MEMBRANE MAINTENANCE

The D.O. probe body is made of reinforced

plastic for maximum durability.

A thermistor temperature sensor provides tem-

perature 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 counter-

clockwise (see fig.2)

• 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 elec-

trolyte.

• 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.

TWIST

AND

PULL

fig. 1

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.

For accurate dissolved oxygen

measurements a water move-

ment of at least 0.3 m/sec is

required.

This movement will ensure that the oxygen-

depleted membrane surface is constantly re-

plenished. A moving stream will provide ad-

equate circulation.

To quickly check if the water speed is suffi-

cient, 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. Ac-

curate 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 tem-

perature difference of several degrees).

BATTERY REPLACEMENT

When the battery level is

low, a "V" will be displayed

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 speci-

fied in this instruction manual.

Slide off the battery cover on the rear of the

meter and replace the 9V battery with a new

one.

BATTERY

• With the sensor facing down, screw the

membrane cap clockwise. Some electro-

lyte will overflow.

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 dam-

aged 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 plati-

num 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 condi-

tion. 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 imper-

fection still exists, or any damage is evident

(such as wrinkles or tears), the membrane

should be replaced. Make sure that the O-

Ring is properly seated in the membrane

cap.

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