Milwaukee MW600 Manual de usuario

Milwaukee

USER MANUAL

PORTABLE

DISSOLVED OXYGEN METER

MODEL: MW600

Smart DO Meter

Milwaukee Instruments Instruction Manual

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PROBE PREPARATION:

The meter is supplied with a 9V battery. Slide off the battery

compartment cover on the back of the meter. Install the battery

into the battery clip connector while observing polarity.

D.O. probes are shipped dry. Assemble 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

2½ 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 a pencil or a rod to disengage

air bubbles. To avoid damaging the

membrane, do not tap the membrane

directly on the bottom.

5. Install O-Ring properly inside the

membrane cap.

6. With the sensor facing down, screw

the cap clockwise. Some electrolyte will

overflow.

7. Examine membrane to verify air is not

trapped between the membrane and

electrode tip.

When probe is not in use and during

polarization, place the protective cap

supplied over the electrode tip.

Milwaukee Instruments Instruction Manual

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PROBE POLARIZATION:

• A dissolved oxygen probe must be polarized to function

properly.

• To polarize the probe, the fully assambled probe must be

connected to the meter and the meter must be on.

• During polarization (and during measurement), approximately

800 mV is applied to the cathode and anode inside the

membrane and a chemical reaction occurs. During the

polarization period excess oxygen in the electrolyte is

consumed. During this phase, probe movement that “moves”

the electrolyte will yield jumpy measurements. When a probe

is totally polarized moving the probe will not effect the

measurement.

• When the meter is turned off, the probe will revert to it’s

prepolarized state. Before using again, the probe will have

to be repolarized.

CALIBRATION PROCEDURE:

The calibration is very simple and fast.

• Make 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.

• Switch the meter on by pressing the ON/OFF

key.

• For an accurate calibration, it is recommended

to wait at least 15 minutes to ensure polarization

of the probe.

• Remove the protective cap from the D.O. probe.

Milwaukee Instruments Instruction Manual

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Zero Calibration:

• Dip the probe into MA9070 zero oxygen

solution and stir gently for 2-3 minutes.

• Wait for the probe to reach it’s lowest

stable reading.

• Adjust the zero D.O. calibration

trimmer (located on the front

panel) until the display reads

"0.0".

Slope Calibration:

It is suggested to perform the slope calibration in water saturated

air.

• Rinse the probe with a large amount of clean water to

remove any residual zero oxygen solution.

• Dry the probe tip and allow a few minutes for the D.O. probe

to stabilize while suspending over a container of water in the

air.

• Press and hold the CAL key.

• Adjust the slope trimmer on the

front panel of the meter to read

"100%" on the LCD (while still

holding the CAL button).

• Release the CAL key and the

LCD will display a value in ppm

of oxygen.

The zero calibration of the MW600 is very stable, therefore

this procedure needs only to be performed whenever the probe

is replaced. However, if most of the measurements are closer

to zero, more frequent zero calibration is advised.

Slope calibration can be easily performed on a weekly basis.

Milwaukee Instruments Instruction Manual

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TAKING MEASUREMENTS:

Verify the probe is polarized and the probe and

meter have been calibrated. Remove the protective

cap from probe. Immerse the tip of the probe in

the sample to be tested.

For accurate dissolved oxygen measurements a

minimum water movement of 0.3 m/sec is required.

This is to ensure that the oxygen-depleted

membrane surface is constantly replenished. A

moving stream will provide adequate circulation. To quickly

check if the water speed is sufficient, wait for the reading to

stabilize and then move the D.O. probe. If the reading is still

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 diffusion of the oxygen present in the air

into the solution are reduced to a minimum.

Always wait for thermal equilibrium to occur between the probe

and the sample before recording a measurement (a few minutes

for temperature difference of several degrees).

ALTITUDE & SALINITY COMPENSATION:

If the sample contains salts or if you are performing the

measurements at a higher altitude, the displayed reading must

be corrected to account for the lower degree of oxygen solubility.

Milwaukee Instruments Instruction Manual

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°C

0 m

14.6

13.8

13.1

12.4

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

300 m

14.1

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

600 m

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

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

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

Altitude, Meters above Sea Level °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

104.0

ALTITUDE COMPENSATION:

Thedisplayedmeasurementsarereferencedtosealevelpressures.

At higher elevations, oxygen solubility decreases (thus at higher

elevations actual oxygen concentrations are really lower than

the displayed value).

The table below illustrates the changes in the solubility of oxygen

in air saturated fresh water as a result of changes in elevation.

The table can also be used to correct the displayed measurement.

If the meter was calibrated at an elevation above sea level, you

multiply your reading by the ratio of:

(ppm at the elevation) / (the ppm at sea level)

For example: You are at 600 m above sea level and the meter

displays 3.2 ppm. The temperature is 14 °C.

Tocorrect yourmeasurement multiplythedisplayed measurement

by the ratio of (ppm reading at 600 m) / (ppm reading at 0 m) =

3.2 ppm X (9.6 ppm/10.3 ppm) = 2.98 ppm (or 3.0 ppm altitude

corrected).

Milwaukee Instruments Instruction Manual

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SALINITY COMPENSATION:

The table below illustrates the change in the solubility of oxygen

in air saturated water as a result of chloride concentration or

salinity.

The table can also be used to correct the displayed measurement.

If you are making measurements in salt water and know the

chloride concentration (or salinity), you can multiply your reading

by the ratio of (ppm at the chloride concentration) / (the ppm at

0 g/L chloride) at the temperature of measurement to compensate

for the salt effect.

levelaeS=rroT067erusserPytinilaSdnaedirolhCnoecnadnepedytilibuloSnegyxO

edirolhCL/g0L/g2L/g4L/g6L/g8L/g01L/g2

1L/g41L/g61L/g81L/g02edirolhC

ytinilaSL/g0L/g6.3L/g3.7L/g9.01L/g5.41L/g1.81L/g7.12L/g3.52L/g9.82L/g5.23L/g1.63ytinilaS

° F°

06.412.419.316.313.319.216.213.219.116.113.110.23

28.315.312.319.216.213.210.216.113.110.117.016.53

41.318.215.212.219.116.114.111.1

18.015.012.012.93

64.212.219.116.113.111.118.015.013.010.017.98.24

88.116.113.111.118.016.013.011.018.96.93.94.64

013.110.118.016.013.011.

018.96.94.91.99.80.05

217.015.013.011.019.96.94.92.90.98.85.86.35

413.011.019.97.94.92.90.98.86.84.82.82.75

618.96.94.93.91.99.87.85.83.81.89.78.0

814.93.91.99.87.85.83.82.80.88.76.74.46

021.99.87.85.84.82.80.88.77.75.73.70.86

227.86.84.82.81.89.77.76.74.72.71.76.17

424.82.81.89.78.76.74.73.71.

70.78.62.57

522.81.89.78.76.75.73.71.70.78.67.60.77

621.89.78.76.75.73.72.70.79.67.66.68.87

828.77.75.74.72.71.79.68.66.65.63.64.28

036.74.73.71.70.78

.66.65.63.62.60.60.68

Milwaukee Instruments Instruction Manual

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PROBE & MEMBRANE MAINTENANCE:

The D.O. probe body is made of reinforced plastic for maximum

durability.

A thermistor temperature sensor provides temperature

measurements of the tested sample. It is always recommended

to keep the protective cap on the probe when not in use, to

protect the membrane against damage and dirt.

To replace the membrane or refill it with electrolyte, see page 1.

For example, if the measurement displayed at 10°C is 5 ppm,

but the sample has 20 g/L of chloride, to correct your measurement

multiply the displayed measurement by the ratio of (ppm reading

at 20 g/L) / (ppm reading at 0 g/L) = 5.0 ppm X (8.9 ppm/11.3 ppm)

= 3.93 ppm (or 3.9 ppm Chloride or Salinity corrected).

Milwaukee Instruments Instruction Manual

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The Platinum cathode

should always be bright

and untarnished. If it is

tarnished or stained, due

to contact with certain

gases or a damaged

membrane cap, the cathode

should be cleaned. You

can 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.

Rinse the probe with deionized or distilled water and install

a new membrane cap using fresh electrolyte (see page 1).

Recalibrate the instrument/probe.

Note: In order to obtain accurate and stable measurements, it

is important that the surface of the membrane be in

perfect condition. This gas-permeable membrane isolates

the sensor elements from the environment, but allows

oxygen to enter. If any dirt is observed on the membrane,

rinse it carefully with distilled or deionized water. If any

imperfections still exist, or any damage is evident (such

as wrinkles or tears-holes), the membrane cap should

be replaced. Make sure that the O-Ring is properly seated

in the membrane cap.

Milwaukee Instruments Instruction Manual

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BATTERY REPLACEMENT:

When the battery becomes weak the

meter will display the low battery

indicator " ".

When this appears, only a few hours

of battery life remain. A low battery will

result in unreliable measurements.

Prompt battery replacement is required.

Battery replacement must take place

in a non-hazardous area using an

alkaline 9V battery.

Turn the meter off, slide the battery

compartment cover located at the rear

of the meter off and replace the 9V

battery with a new one. Make sure

the battery contacts are fully engaged

in the connector, seat the battery in its

compartment and replace the cover.

OPTIONAL ACCESSORIES:

MA9070 Zero Oxygen calibration solution, 220 mL

MA9071 Refilling Electrolyte solution, 220 mL

MA841 Spare membrane, 5 pcs

MA840 D.O. probe

Milwaukee Instruments Instruction Manual

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