Milwaukee MI605 Bedienungsanleitung

INSTRUCTION MANUAL

SATISFACTION

GUARANTEED

MI605

Dissolved Oxygen

Meter

All rights are reserved. Reproduction in whole or in part is

prohibited without the written consent of the copyright owner,

Milwaukee Instruments Inc., Rocky Mount, NC27804USA.

THANK YOU for choosing Milwaukee Instruments!

This instruction manual will provide you the necessary

information for correct use of the meters.

TABLE OF CONTENTS

1. SPECIFICATIONS.........................................................................................................4

2. ACCESSORIES .............................................................................................................4

3. INITIAL OPERATIONS...............................................................................................4

4. PROBE PREPARATION.............................................................................................5

5. PROBE POLARIZATION...........................................................................................6

6. MEASUREMENTS .......................................................................................................7

7. ALTITUDE COMPENSATION ...................................................................................8

8. SALINITY COMPENSATION...................................................................................9

9. CALIBRATION PROCEDURE................................................................................ 10

10. PROBE & MEMBRANE MAINTENANCE........................................................11

11. BATTERY REPLACEMENT ....................................................................................13

CERTIFICATION.............................................................................................................. 14

RECOMMENDATION.................................................................................................... 14

WARRANTY...................................................................................................................... 14

4MI605 Dissolved Oxygen Meter

1. SPECIFICATIONS

Range

0.0 to 45.00 mg/L (ppm) O2

0.0 to 300 % O2

0.0 to 50.0 °C

Resolution 0.01 mg/L (ppm) O2/ 0.1 %O2

0.1 °C

Accuracy (@25°C) ± 1.5% F.S. (mg/L O2/ %O2)

± 0.5 °C

TYPICAL EMC DEVIATION ± 0.3 mg/L (ppm) O2/ ± 3.5 %O2

± 0.5 °C

CALIBRATION Automatic in saturated air

TEMPERATURE COMPENSATION Automatic, from 0 to 50°C

ALTITUDE COMPENSATION 0 to 4000 m; 100 m resolution

SALINITY COMPENSATION 0 to 80 g/L; 1 g/L resolution

PROBE MA840 (included)

ENVIRONMENT 0 to 50°C; 100% RH max.

BATTERY TYPE 1 x 9V alkaline (included)

BATTERY LIFE approx. 100 hours of use

AUTO-OFF after 4 hours of non-use

DIMENSIONS 200 × 85 × 50 mm

WEIGHT 280 g (with battery)

2. ACCESSORIES

MA840 D.O. probe

MA841 Spare membrane, 5 pcs

MA9071 Refilling Electrolyte solution, 230 ml

3. INITIAL OPERATIONS

The meter is supplied with a 9V battery. Remove the battery

compartment cover on the back of the meter andinstall the

battery while paying attention to its polarity.

PROBE PREPARATION 5

4. PROBE PREPARATION

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 and black plastic cap.

This cap is used for shipping purposes

only and can be thrown away.

2. Wet the sensor by soaking the bottom

2.5 cm of the probe in electrolyte

(MA9071) for 5 minutes.

3. Rinse the membrane (supplied with the

meter) with electrolyte while shaking it

gently. Refill with clean electrolyte.

4. Gently tap the sides of the membrane

with the finger tip to ensure that no

air bubbles remain trapped. To avoid

damaging the membrane, do not tap the

membrane directly on the bottom.

5. Place rubber O-Ring properly inside the membrane cap.

6. With the sensor facing down, screw the cap clockwise.

Some electrolyte will overflow.

When not in use and during polarization, place the protective cap

supplied with the meter.

SECOND

FILL

FIRST

INSERT

O’RING

THIRD

TAP

SHIPPING

CAP

BLACK

RED

THEN

SCREW BACK ON

6MI605 Dissolved Oxygen Meter

5. 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 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 both that of the test solution as well

as that present in the electrolyte solution.

This reading is obviously incorrect.

MEASUREMENTS 7

6. 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 while ensuring that also the temperature

sensor is immersed.

For accurate dissolved oxygen measurements, a water movement

of at least 0.3 m/sec is required. This is to ensure that the

oxygen-depleted membrane surface is constantly replenished.

A moving stream will provide an adequate circulation. To quickly

check if the water speed is suicient, wait for the reading to

stabilize and then move the D.O. probe. If the reading remains

stable, the measurement conditions are right, while if the reading

increases the water movement is not adequate.

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 to

ensure a certain velocity in the fluid is recommended.

In this way, errors due to the diusion of the oxygen present in the

air in the solution are reduced to a minimum.

Anyway, wait the time necessary for thermal equilibrium to occur

between the probe and the sample (a few minutes for temperature

dierence of several degrees).

The meter can display D.O. readings in mg/L (ppm) and in % O2

(rate of Oxygen saturation with reference to 100% at sea level).

Press the RANGE key to select the desired range.

The temperature measurement is always displayed on the lower

part of the LCD.

If the sample contains salts or if the measurement is performed

at altitude dierent from sea level, the readout values must be

corrected, taking into account the lower degree of oxygen solubility.

Set altitude and salinity compensations before performing calibration

and taking measurements. The meter will automatically compensate

for these factors.

8MI605 Dissolved Oxygen Meter

7. ALTITUDE COMPENSATION

To enter altitude compensation, press the FACTOR key and the

meter will display the “ALT FACTOR” message. Use UP and DOWN

keys to set the altitude from 0 to 4.0 km, in steps of 0.1 km.

The meter will automatically compensate for altitude (see also the

table below for verification).

ºC

Altitude, Meters above Sea Level

ºF

300

600

900

1200

1500

1800

014.6 14.1 13.6 13.2 12.7 12.3 11.8 32.0

213.8 13.3 12.9 12.4 12.0 11.6 11.2 35.6

413.1 12.7 12.2 11.9 11.4 11.0 10.6 39.2

612.4 12.0 11.6 11.2 10.8 10.4 10.1 42.8

811.8 11.4 11.0 10.6 10.3 9.9 9.6 46.4

10 11.3 10.9 10.5 10.2 9.8 9.5 9.2 50.0

12 10.8 10.4 10.1 9.7 9.4 9.1 8.8 53.6

14 10.3 9.9 9.6 9.3 9.0 8.7 8.3 5 7. 2

16 9.9 9.7 9.2 8.9 8.6 8.3 8.0 60.8

18 9.5 9.2 8.7 8.6 8.3 8.0 7. 7 64.4

20 9.1 8.8 8.5 8.2 7.9 7. 7 7.4 68.0

22 8.7 8.4 8.1 7. 8 7. 7 7. 3 7.1 71.6

24 8.4 8.1 7. 8 7. 5 7. 3 7.1 6.8 75.2

26 8.1 7. 8 7. 5 7. 3 7.0 6.8 6.6 78.8

28 7. 8 7. 5 7. 3 7. 0 6.8 6.6 6.3 82.4

30 7. 5 7. 2 7.0 6.8 6.5 6.3 6.1 86.0

32 7. 3 7.1 6.8 6.6 6.4 6.1 5.9 89.6

34 7.1 6.9 6.6 6.4 6.2 6.0 5.8 93.2

36 6.8 6.6 6.3 6.1 5.9 5.7 5.5 96.8

38 6.6 6.4 6.2 5.9 5.7 5.6 5.4 100.4

40 6.4 6.2 6.0 5.8 5.6 5.4 5.2 104.4

SALINITY COMPENSATION 9

8. SALINITY COMPENSATION

To enter salinity compensation, press the FACTOR key twice and

the “SALT FACTOR” message will be displayed. Use UP and DOWN

keys to set the salinitybetween 0 and 80 g/L.

The meter will automatically compensate for salinity eects (see

also following table for verification).

ºC Salinity (g/l) at Sea Level ºF

0 g/l 10 g/l 20 g/l 30 g/l 35 g/l

10 11.3 10.6 9.9 9.3 9.0 50.0

12 10.8 10.1 9.5 8.9 8.6 53.6

14 10.3 9.7 9.1 8.6 8.3 5 7. 2

16 9.9 9.3 8.7 8.2 8.0 60.8

18 9.5 8.9 8.4 7. 9 7.6 64.4

20 9.1 8.5 8.0 7. 6 7. 4 68.0

22 8.7 8.2 7. 8 7. 3 7.1 71.6

24 8.4 7. 9 7.5 7.1 6.9 75.2

26 8.1 7.6 7. 2 6.8 6.6 78.8

28 7. 8 7. 4 7. 0 6.6 6.4 82.4

10 MI605 Dissolved Oxygen Meter

9. CALIBRATION PROCEDURE

Calibration is simple and is recommended every time the meter

is switched on.

yMake sure the probe is ready for measurements (see Probe

Preparation), i.e. the membrane is filled with electrolyte and the

probe is connected to the meter and properly polarized.

ySwitch the meter on by pressing the ON/OFF key.

yThe "COND" message will be displayed for about 45 sec. to

inform the user that the probe is in auto-conditioning mode

(automatic polarization).

yOnce “COND” disappears, the probe is polarized and the

instrument can be calibrated.

yRemove the probe protective cap.

yPress CAL. "----" appears on the larger LCD together with "CAL"

to indicate that the instrument is in calibration mode.

yThe instrument will automatically standardize itself to the

actual saturation value. After approx. 1 minute it will display

"100%" to indicate that the calibration is complete.

Notes: It is recommended to re-calibrate the meter whenever

probe, membrane or electrolyte is changed.

To exit the calibration mode, press CAL.

Switching from readings in % O2to readings in mg/L does not

require recalibration.

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