Milwaukee MW190 MAX User manual

INSTRUCTION MANUAL
SATISFACTION
GUARANTEED
MW190 MAX
Dissolved Oxygen & Temperature
Bench 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 meter.

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TABLE OF CONTENTS
1. PRELIMINARY EXAMINATION...................................................................................................................................4
2. INSTRUMENT OVERVIEW ..........................................................................................................................................5
3. SPECIFICATIONS.............................................................................................................................................................6
4. FUNCTIONAL & DISPLAY DESCRIPTION............................................................................................................8
5. MA845 PROBE DESCRIPTION.................................................................................................................................11
6. GENERAL OPERATIONS............................................................................................................................................. 12
6.1. POWER CONNECTION & BATTERY MANAGEMENT..........................................................................12
6.2. PROBE PREPARATION.....................................................................................................................................12
6.3. PROBE MAINTENANCE...................................................................................................................................14
7. SETUP..................................................................................................................................................................................15
7.1. SETUP OPTIONS...................................................................................................................................................15
8. ALTITUDE & SALINITY COMPENSATION..........................................................................................................21
9. CALIBRATION.................................................................................................................................................................22
10. MEASUREMENT..........................................................................................................................................................25
11. LOGGING.......................................................................................................................................................................... 27
11.1. TYPES OF LOGGING ......................................................................................................................................... 27
11.2. DATA MANAGEMENT......................................................................................................................................29
12. GLP....................................................................................................................................................................................36
12.1. DO INFORMATION............................................................................................................................................36
13. TROUBLESHOOTING................................................................................................................................................. 37
14. ACCESSORIES.............................................................................................................................................................. 37
CERTIFICATION..................................................................................................................................................................38
RECOMMENDATION........................................................................................................................................................38
WARRANTY..........................................................................................................................................................................38

4MW190 Dissolved Oxygen & Temperature Bench Meter
1. PRELIMINARY EXAMINATION
Each bench meter is delivered in a cardboard box and is supplied with:
yMA845 Dissolved Oxygen and Temperature polarographic probe
yMA841 Membrane cap and o-ring (2 pcs.)
yMA9071 Electrolyte solution
yMA9315 Electrode holder
yProbe protective cap
y12 VDC adapter
yUSB cable
yInstrument quality certificate
yInstruction manual

INSTRUMENT OVERVIEW 5
2. INSTRUMENT OVERVIEW
MW190 is a compact and versatile bench meter designed for testing dissolved oxygen in
the pharmaceutical and food industry, as well as monitoring in water treatment plants.
Concentration measurements are automatically compensated for temperature and
salinity. Salinity and altitude can be configured in Setup.
Temperature is automatically measured (in both degree Celsius and Fahrenheit) and
compensated.
Other features include:
yEasy to read LCD display
yBuilt-in rechargeable battery with an 8-hour capacity
yAuto-o feature to prolong battery life
yBattery charger with battery monitor
yInternal clock and date to keep track of dierent time-dependent functions (calibration
timestamp, calibration time out)
yMeasurement logging (on demand, on stability, interval)
yAvailable log space for up to 1000 records
yLogged data can be exported using a USB cable or directly on a USB flash drive
yDedicated GLP key to store and recall data on system status
For accurate measurements, use the electrode holder supplied with the bench meter.

6MW190 Dissolved Oxygen & Temperature Bench Meter
3. SPECIFICATIONS
Range
DO * 0.00 to 45.00 mg/L (ppm)
0.0 to 300.0 %
Temperature ** -20.0 to 120.0 °C (-4.0 to 248.0 °F)
Resolution
DO 0.01 mg/L (ppm)
0.1 %
Temperature 0.1 °C (0.1 °F)
Accuracy
DO ±1.5 % of reading ±1 digit
Temperature ±0.4 °C (±0.8 °F)
Calibration One- or two-points
0% (MI9070) and 100% (water saturated air)
Temperature compensation Automatic, from 0.0 to 50.0 °C (32.0 to 122.0 °F)
Salinity compensation 0 to 40 g/L (with 1 g/L resolution)
Altitude compensation -500 to 4,000 m (-1640’ to 13123’) with 100 m (328’) resolution
Log
Max. 1000 log records (stored in up to 100 lots)
On demand, 200
On stability, 200
Interval logging, 1000
PC connectivity 1 USB type A port, 1 micro USB port
Power supply 12 VDC adapter (included)
Battery life 8 hours
Environment 0 to 50 °C (32 to 122 °F); maximum RH 95%
Dimensions 230 x 160 x 95 mm (9.0 x 6.3 x 3.7”)
Weight 0.9 kg (2.0 lb.)
* DO measurement is performed within the automatic temperature compensation interval.
** Limits will be reduced to actual sensor limits.

SPECIFICATIONS 7
PROBE SPECIFICATIONS
DO probe
MA845
DO sensor Polarographic
Temperature range 0.0 to 50.0 °C (32.0 to 122.0 °F)
Temperature sensor Built-in thermistor
Cathode Platinum
Anode Silver
Membrane Oxygen permeable Teflon® membrane
Connector socket DIN, 7 pins
Body PP, ABS, IP rating
Dimensions Total length: 160 mm (6.3”)
Ø 32 mm (1.26”)
Cable Jacket material: PP

8MW190 Dissolved Oxygen & Temperature Bench Meter
4. FUNCTIONAL & DISPLAY DESCRIPTION
Front Panel
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2
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9
1. Liquid Crystal Display (LCD)
2. ESC key, to exit current mode
3. RCL key, to recall the logged values
4. SETUP key, to enter setup mode
5. LOG/CLEAR key, to log the reading or to clear calibration or logging
6. ON/OFF key
7.  directional keys for menu navigation and setting parameters
8. RANGE/key, to select setup parameters and toggle between measurement units
9. GLP/ACCEPT key, to enter GLP or to confirm selected action
10. CAL/EDIT key, to enter/edit calibration settings, edit setup settings

FUNCTIONAL & DISPLAY DESCRIPTION 9
Rear Panel
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2
3
4
1. Micro USB port
2. USB type A port
3. Power supply socket
4. DIN probe connector

10 MW190 Dissolved Oxygen & Temperature Bench Meter
Display Description
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1. Stability indicator
2. Status information
3. USB connection status
4. Mode tags
5. Probe symbol
6. Log tag
7. Accept tag
8. Third LCD line, message area
9. Measurement units
10. First LCD line, measurement readings
11. Arrow tags, to navigate the menu in either direction
12. Automatic temperature compensation tag
13. Temperature units
14. Second LCD line, temperature readings
15. Measurement units for salinity and altitude
16. TIME tag

MA845 PROBE DESCRIPTION 11
5. MA845 PROBE DESCRIPTION
The MA845 probe uses a polarographic dissolved oxygen sensor with a built-in thermistor
that allows stable, temperature compensated readings.
The sensor makes use of a platinum cathode, a silver wire anode and electrolyte
solution protected by an oxygen permeable membrane. Oxygen that passes through the
membrane causes a current flow, from which the oxygen concentration is determined.
The membrane is fixed to a detachable cap that allows for simple replacement and
priming.
The probe has a reinforced plastic body for durability.
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2
3
45
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8
1. Cable jacket
2. Probe body
3. Temperature sensor
4. O-ring seal
5. Membrane cap
6. Oxygen permeable Teflon® membrane
7. Silver wire anode element
8. Platinum cathode (sensor)

12 MW190 Dissolved Oxygen & Temperature Bench Meter
6. GENERAL OPERATIONS
6.1. POWER CONNECTION & BATTERY MANAGEMENT
MW190 has a built-in rechargeable battery that provides up to 8 hours of use. The internal
battery recharges with the supplied 12 VDC adapter or while connected to a PC USB port
or standard 5V USB charger.
MW190 is equipped with Battery Error Prevention System (BEPS) feature, which turns the
meter o after 10 minutes of non-use (see Auto O in SETUP OPTIONS section).
At power on, the instrument performs an auto-diagnostic test and all LCDsegments are
displayed for a few seconds. Use  keys to check the battery percentage.
6.2. PROBE PREPARATION
DO probes shipped from Milwaukee Instruments are dry.
Before measurements membrane cap needs to be primed and the probe polarized.
Changing the membrane cap
1. For new probes, remove the red and black shipping cap.
2. Open the supplied membrane package and remove one o-ring and one membrane cap.
3. Soak the bottom 2½ cm (1”) of the sensor in MA9071 electrolyte solution for 5 minutes.
4. Inspect the membrane cap. The membrane is thin and can not be repaired if damaged.
5. Position the o-ring. Prime the cap with electrolyte solution. Shake gently, discard and
refill with clean solution making sure to cover the o-ring.
6. Gently tap the side of the cap to remove trapped air bubbles. Do not tap on the
membrane directly as it may damage it.
7. With the sensor facing downward, slowly screw the cap upward and counter
clockwise. Some electrolyte will overflow.
8. Rinse the outer body of the probe and inspect the membrane for trapped gas bubbles.
The cathode area should be free of bubbles.
9. While the probe is not in use, put the protective plastic cap on.
Connecting the probe
MA845 is connected to the meter through a DIN connector. With the meter o:
yConnect the probe to the DIN socket on the top of the meter.
yAlign the pins and key then push the plug into the socket. Tighten the threaded ring.
yMount the supplied metallic plate onto the meter. Tighten the screw to lock in place.
yMount the arm holder over the metallic pin from the plate.
yPlace the probe into the holder.

GENERAL OPERATIONS 13
yContinue with probe conditioning (polarizing) function.
Fill
Tap
Screw
back on
Position
the O-ring
Probe Polarization
A new probe must be polarized before calibration.
yConnect the probe and power on the meter
y“DISSOLVED OXYGEN PROBE CONDITIONING” is displayed for about 60 seconds while
the DO probe is conditioned. If the probe was previously conditioned and remained
connected to the meter, press any key to enter measurement mode.
The DO probe is continuously polarized when connected to the meter. Polarization does
not need to be performed unless maintenance is performed or the probe is disconnected
from the meter.
The probe is polarized with a fixed voltage of approximately 800 mV between the cathode
and anode. Probe polarization is essential for stable measurements. With the probe
properly polarized, oxygen is continually consumed as it passes through the sensitive
diaphragm and dissolves in the electrolyte solution contained in the probe.
If polarization is interrupted, the electrolyte solution continues to be enriched with oxygen
until it reaches an equilibrium with the surrounding solution. Measurements taken with
a non-polarized probe are drifty and inaccurate. The measurement will jump when the
probe is moved.
Note: When not in use and during polarization, use the protective cap.

14 MW190 Dissolved Oxygen & Temperature Bench Meter
6.3. PROBE MAINTENANCE
The platinum cathode should always be bright and untarnished. If it is tarnished or stained,
the cathode should be cleaned gently with a lint-free cloth.
yRinse the probe with deionized or distilled water.
yReplace the membrane cap using fresh electrolyte. See PROBE PREPARATION procedure.
yRecalibrate the meter.
Membrane Maintenance
For accurate and stable measurements, perfect condition of the membrane surface is
needed. Protect the thin membrane from scratches, abrasion or contact with solids.
If no measurements are taken for a few hours, protect the membrane with the plastic
protective cap.
If fouled, rinse it carefully with distilled or deionized water. If damaged, replace the
membrane cap.
Note: Change the membrane every 8 weeks or more frequently if used in a specially
fouling environment. Check and replace the electrolyte fill solution every 4 weeks.
Storage
After taking the measurements, switch the meter o and clean the probe before storage.
When not in use the probe should be stored with the plastic protective cap on.
For short term storage, the probe can also be stored in a beaker of deionized water with
the protective plastic cap removed.
For long term storage, the probe should be stored dry:
1. Disconnect the probe from the meter
2. Unscrew the membrane cap
3. Remove any electrolyte solution from the cap
4. Rinse the probe anode/cathode assembly with distilled water and blot dry
5. Screw the membrane cap onto the probe until the membrane cap is hand tight

SETUP 15
7. SETUP
To configure the meter settings, modify default values or set measurement parameters:
yPress SETUP to enter (or exit) Setup mode
yUse  keys to navigate the menus (view parameters)
yPress CAL/EDIT to enter Edit mode (modify parameters)
yPress RANGE/key to select between options
Use  keys to modify values (value being modified is displayed blinking)
yPress GLP/ACCEPT to confirm and save changes (ACCEPT tag is displayed blinking)
yPress ESC (or CAL/EDIT again) to exit Edit mode without saving (return to menu)
7.1 . SETUP OPTIONS
Log Type
Options: INTERVAL (default), MANUAL or STABILITY
Press RANGE/to select between options.
Use  keys to set time interval: 5 (default), 10, 30 sec. or 1, 2, 5, 15, 30, 60, 120, 180 min.
Use  keys to select stability type: fast (default), medium or accurate.

16 MW190 Dissolved Oxygen & Temperature Bench Meter
Calibration Expired Warning
Options: 1 to 7 days (default) oro
Use  keys to select the number of days since last calibration has elapsed.
Altitude Compensation
Options: -500 to 4000 m
Use  keys to set the appropriate altitude of the location.
Salinity Compensation
Options: 0 to 40 g/L
Use  keys to modify the value.

SETUP 17
Dissolved Oxygen Unit
Options: ppm or mg/L
Press RANGE/to navigate right and select the unit.
Date
Options: year, month or day
Press RANGE/to select options. Use  keys to modify the values.
Time
Options: hour, minute or second
Press RANGE/to select. Use  keys to modify the values.

18 MW190 Dissolved Oxygen & Temperature Bench Meter
Auto O
Options: 5, 10 (default), 30, 60 minutes or o
Use  keys to select the time.
The meter will power o after set period of time.
Sound
Options: enable (default) or disable
Use  keys to select.
When pressed, each key will emit a short acoustic signal.
Temperature Unit
Options: °C (default) or °F
Use  keys to select the unit.

SETUP 19
LCD Contrast
Options: 1 to 9 (default)
Use  keys to select LCD contrast values.
Default Values
Resets meter settings to factory defaults.
Press GLP/ACCEPT to restore the default values. “RESET DONE” message confirms that the
meter performs with default settings.
Instrument Firmware Version
Displays the installed firmware version.

20 MW190 Dissolved Oxygen & Temperature Bench Meter
Meter ID / Serial Number
Use  keys to assign a meter ID from 0000 to 9999.
Press RANGE/to view the serial number.
Separator Type
Options: comma (default) or semicolon
Use  keys to select the columns separator for the CSV file.
Export to PC / Log on Meter
Options: Export to PC and Log on Meter
With the micro USB cable connected, press SETUP. Press CAL/EDIT to enter Edit mode.
Use  keys to select.
Note: This option is only available while connected to a PC. The USB/PC icon is not
displayed if LOG ON METER option was previously set.