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.

PROBE & MEMBRANE MAINTENANCE 11
10. 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 it
against damage and dirt.
To replace the membrane or refill it with electrolyte, proceed
as follows:
yRemove protective cap by gently twisting
and pulling it o the probe's body.
yUnscrew the membrane by turning it
counterclockwise with the other hand.
yWet the sensor by soaking the bottom 2.5cm
of the probe in electrolyte (MA9071) for
5minutes.
yRinse new membrane supplied with meter
with electrolyte, while shaking it gently.
Refill with clean electrolyte.
yGently tap the sides of the membrane with
the finger tip to ensure that no air bubbles
remain trapped. Do no directly tap the
bottom with the finger as this will damage
the membrane.
yMake sure that the rubber O-ring is seated
properly inside the membrane cap.
yWith the sensor facing down, screw
the membrane cap clockwise. Some
electrolyte will overflow.
If the Platinum cathode is tarnished or stained, which could be
due to contact with certain gases or to an extended use with a
loose or damaged membrane, it should be cleaned.
Use a clean lint-free cloth and rub the cathode very gently side
to side 4-5 times. This will be enough to polish it and remove any
stains without damaging the Platinum tip.
Afterwards, rinse the probe with deionized or distilled water and
install a new membrane cap using fresh electrolyte and follow the
steps above. Recalibrate the instrument.
TWIST
AND
PULL
UNSCREW
SILVER
CHLORIDE
ANODE
SILVER
CHLORIDE
ANODE
PLATINUM
CATHODE
OXYGEN
PERMEABLE
TEFLON
MEMBRANE

12 MI605 Dissolved Oxygen Meter
Note: To obtain accurate and stable measurements, it is
important that the surface of the membrane be in perfect
condition. This semipermeable 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), replace the membrane. Make sure
that the O-Ring is properly seated in the membrane cap.
Note: If don’t take measurements for a few hours, protect the
probe with the supplied cap.

BATTERY REPLACEMENT 13
11. BATTERY REPLACEMENT
Whenthe batterybecomes weak,the meterwilldisplaythe blinking
battery symbol to indicate that only about 10 hours of battery life
remain. A low battery will result in unreliable measurements. It
is recommended to replace the battery immediately by using an
alkaline 9V battery.
Turn the meter o, unscrew the two screws on the rear of the
instrument, remove the cover and replace the 9V battery with a
new one. Install the battery while paying attention to its polarity
and reattach the cover.

14 MI605 Dissolved Oxygen Meter
MANMI605 07/20-1
CERTIFICATION
Milwaukee Instruments conform to the CE European Directives.
RoHS
COMPLIANT
Disposal of Electrical & Electronic Equipment. Do not treat this product
as household waste. Hand it over to the appropriate collection point for
the recycling of electrical and electronic equipment.
Disposal of waste batteries. This product contains batteries. Do not
dispose of them with other household waste. Hand them over to the
appropriate collection point for recycling.
Please note: proper product and battery disposal prevents potential
negative consequences for human health and the environment. For
detailed information, contact your local household waste disposal
service or go to www.milwaukeeinstruments.com (US only) or
www.milwaukeeinst.com.
RECOMMENDATION
Before using this product, make sure it is entirely suitable for your specific
application and for the environment in which it is used. Any modification
introduced by the user to the supplied equipment may compromise the
meter’s performance. For your and the meter’s safety do not use or store
the meter in hazardous environment. To avoid damage or burn, do not
perform any measurement in microwave ovens.
WARRANTY
These instruments are warranted against defects in materials and
manufacturing for a period of 2 years from the date of purchase.
Electrodes and Probes are warranted for 6 months. This warranty is
limited to repair or free of charge replacement if the instrument cannot
be repaired. Damage due to accidents, misuse, tampering or lack of
prescribed maintenance is not covered by warranty. If service is required,
contact your local Milwaukee Instruments Technical Service. If the
repair is not covered by the warranty, you will be notified of the charges
incurred. When shipping any meter, make sure it is properly packaged for
complete protection.

Milwaukee Instruments reserves the right to make improvements in design,
construction and appearance of its products without advance notice.

THANK YOU FOR CHOOSING
Sales and Technical Service Contacts:
Milwaukee Electronics Kft.
Alsó-kikötő sor 11C
H-6726 Szeged - HUNGARY
tel: [phone]
fax: [phone]
www.milwaukeeinst.com
e-mail: [e-mail]
Milwaukee Instruments, Inc.
2950 Business Park Drive
Rocky Mount, NC 27804 USA
tel: [phone]
fax: [phone]
www.milwaukeeinstruments.com
e-mail: [e-mail]
MANMI605