Milwaukee MW600 User Manual

Milwaukee

PORTABLE

DISSOLVED OXYGEN METER

MODEL: MW600

Smart DO Meter

USER MANUAL

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.

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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.

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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.

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