Milwaukee MI605 User manual

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.

3
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
0
m
300
m
600
m
900
m
1200
m
1500
m
1800
m
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.