Milwaukee MAX MW160 User manual

INSTRUCTION MANUAL
SATISFACTION
GUARANTEED
MW160 MAX
pH / mV / ISE / 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.

3
TABLE OF CONTENTS
1. PRELIMINARY EXAMINATION...................................................................................................................................5
2. INSTRUMENT OVERVIEW ..........................................................................................................................................6
3. SPECIFICATIONS............................................................................................................................................................. 7
4. FUNCTIONAL DESCRIPTION.....................................................................................................................................9
5. PROBE DESCRIPTION ...............................................................................................................................................12
6. GENERAL OPERATIONS.............................................................................................................................................14
6.1. POWER CONNECTION & BATTERY MANAGEMENT..........................................................................14
6.2. MOUNTING THE ELECTRODE HOLDER ..................................................................................................14
6.3. CONNECTING THE PROBES .........................................................................................................................15
6.4. ELECTRODE CARE & MAINTENANCE......................................................................................................16
7. SETUP..................................................................................................................................................................................18
8. pH ........................................................................................................................................................................................20
8.1. PREPARATION......................................................................................................................................................20
8.2. CALIBRATION......................................................................................................................................................20
8.3. MEASUREMENT ................................................................................................................................................22
8.4. WARNINGS & MESSAGES............................................................................................................................23
9. ORP .....................................................................................................................................................................................24
9.1. PREPARATION...................................................................................................................................................... 24
9.2. CALIBRATION......................................................................................................................................................24
9.3. MEASUREMENT.................................................................................................................................................25
9.4. WARNINGS & MESSAGES............................................................................................................................26
10. ISE...................................................................................................................................................................................... 27
10.1. PREPARATION.................................................................................................................................................... 27
10.2. CALIBRATION.................................................................................................................................................... 27
10.3. MEASUREMENT...............................................................................................................................................29
10.4. WARNINGS & MESSAGES..........................................................................................................................29
11. LOGGING..........................................................................................................................................................................30
12. GOOD LABORATORY PRACTICE (GLP)............................................................................................................34

4MW160 Bench Meter
13. PC CONNECTION........................................................................................................................................................ 37
13.1. USING MI5200 PC APPLICATION............................................................................................................. 37
13.2. SENDING COMMANDS FROM PC........................................................................................................... 37
14. TROUBLESHOOTING.................................................................................................................................................39
15. ACCESSORIES..............................................................................................................................................................40
CERTIFICATION...................................................................................................................................................................41
RECOMMENDATION.........................................................................................................................................................41
WARRANTY..........................................................................................................................................................................42

PRELIMINARY EXAMINATION 5
1. PRELIMINARY EXAMINATION
Each bench meter is delivered in a cardboard box and is supplied with:
yMAB/1 Double junction refillable pH electrode
yMARStainless steel temperature probe
yM pH 4.01 buer solution (sachet)
yM pH 7.01 buer solution (sachet)
yM pH 10.01 buer solution (sachet)
yM Electrode cleaning solution (sachet)
yMA Electrode holder
yMA RS connector cable (2 m)
yGraduated pipette
y12 VDC adapter
yInstrument quality certificate
yInstruction manual

6MW160 Bench Meter
2. INSTRUMENT OVERVIEW
MW is a compact and versatile bench meter that can measure up to four dierent
parameters — pH, ORP, ISE (directly in ppm) and temperature.
The main operating modes are setup, calibration, measurement and logging.
pH calibration can be performed in up to 3 points (using a selection of 7 standard
calibration buers), to improve measurement reliability, even when testing samples with
wide dierences in pH.
ISE calibration can be performed in up to 2 points with 6 standard solutions available.
The meter can store up to 50 data sets for each range (pH, ORP, ISE) that can be
downloaded to a PC via RS or USB.
Other features include:
yEasy to read LCD display
yRelative mV feature
yInternal clock and date to keep track of dierent time-dependent functions (calibration
timestamp, calibration time-out)
yUser-selectable time-out alarm to alert the user that too much time elapsed since the
last pH calibration
yGLP feature to recall last calibration data for pH and ISE
For accurate measurements use the electrode holder supplied with the meter.

SPECIFICATIONS 7
3. SPECIFICATIONS
Range
pH –2.00 to 16.00 pH
ORP ±699.9 mV / ±2000 mV
ISE 0.001 to 19999 ppm
Temp. –20.0 to 120.0°C (–4.0 to 248.0 °F)
Resolution
pH 0.01 pH
ORP 0.1 mV / 1 mV
ISE
0.001 (0.001 to 9.999) ppm
0.01 (10.00 to 99.99) ppm
0.1 (100.0 to 999.9) ppm
1 (1000 to 19999) ppm
Temp. 0.1°C / 0.1 °F
Accuracy
(@ 20°C / 68 °F)
pH ±0.01 pH
ORP ±0.2 mV / ±1 mV
ISE ±0.5% F.S.
Temp. ±0.4°C / ±0.8 °F
RelmV oset ±2000 mV
pH calibration up to 3-point calibration, with 7 memorized buers: pH 1.68,
4.01, 6.86, 7.01, 9.18, 10.01 and 12.45
ISE calibration 1 or 2 points calibration, 6 standard solutions available: 0.01,
0.1, 1, 10, 100, 1000 ppm
Temperature compensation ATC – automatic, from –20.0 to 120.0°C (–4.0 to 248.0 °F)
MTC – manual, without temperature probe
Logging memory Up to 50 records for each measurement range (pH, ORP, ISE)
Power supply 12 VDC adapter (included)
PC connectivity USB port and RS interface
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 1.1 kg (2.4 lb.)

8MW160 Bench Meter
Probe Specifications
pH electrode
MAB/1
pH range 0 to 14 pH
Temperature range 0 to 70 °C (32 to 158 °F)
Operating temperature 20 to 40 °C (68 to 104 °F)
Reference electrolyte KCl 3.5M
Reference junction Ceramic, single
Reference type Double, Ag/AgCl
Maximum pressure 0.1 bar
Body Glass; tip shape: sphere
Connector BNC
Dimensions Shaft length: 120 mm (5.5”); Ø 12 mm (0.5”)
Cable length 1 m (3.2 ft)
Temperature probe
MAR
Temperature sensor NTCK
Body Stainless steel
Connector RCA
Dimensions Total length: 190 mm (7.5”)
Active part: 120 mm (5.5”); Ø 3,6 mm (1.4”)
Cable length 1 m (3.2 ft)

FUNCTIONAL DESCRIPTION 9
4. FUNCTIONAL DESCRIPTION
Front Panel
1
2
3
4
5
6
7
8
9
1. Liquid Crystal Display (LCD)
2. CAL key, to enter / exit Calibration mode
3. MR key, to enter / exit Memory Recall mode
4. GLP/ACCEPT key, to enter GLP or to confirm selected action
5. LOG/CLR key, to log the reading or to clear calibration or logging
6. ON/OFF key
7. directional keys, to navigate the menu, to modify parameter values, or to select
calibration solutions or logged data
8. RANGE key, to select measurement range or to switch focused data
9. SETUP key, to enter / exit Setup mode; in Logging mode to toggle between delete one
and delete all logged data

10 MW160 Bench Meter
Rear Panel
1
2
3
4
5
6
1. USB socket
2. RS socket
3. Power supply socket
4. RCA connector for temperature probe
5. BNC electrode connector
6. Reference electrode connector

FUNCTIONAL DESCRIPTION 11
Display Description
1 1
2
3
4
5
6
7
8
2
9
6
10
11
12
2
1. Measurement units
2. Status and calibration information
3. CAL tag and pH calibration buers
4. OPEN tag
5. Probe symbol
6. Mode tags (GLP, SETUP, LOG, MEASURE)
7. ACCEPT tag
8. First LCD line, measurement readings
9. DATE and TIME tags
10. Temperature compensation status (MTC, ATC)
11. Measurement units for second LCD line
12. Second LCD line

12 MW160 Bench Meter
5. PROBE DESCRIPTION
MAB/1 for pH measurement:
yDouble junction design, reduces risk of clogging with the reference cell physically
separated from the intermediate electrolyte.
yRefillable, with MA 3.5M KCl. This solution is silver free. Silver can cause silver
precipitate to form at the junction resulting in clogging. Clogging causes erratic and
slow readings. The ability to refill the electrolyte also extends the life of the electrode.
yGlass body, is easily cleaned and resistant to chemicals.
yRound tip, provides the largest possible surface area for faster readings and is well
suited to testing liquid samples.
1
2
3
4
5
6
1. Reference wire
2. Inner reference junction
3. Sensing wire
4. Reference refill cap
5. Outer reference junction
6. Glass bulb

PROBE DESCRIPTION 13
MARfor temperature measurement and automatic temperature compensation (ATC):
yMade of stainless steel for corrosion resistance.
yUsed in conjunction with the pH electrode to utilize the instrument’s ATC capability.
1
2
3
1. Cable
2. Handle
3. Stainless steel tube

14 MW160 Bench Meter
6. GENERAL OPERATIONS
6.1. POWER CONNECTION & BATTERY MANAGEMENT
MW160 can be powered from the supplied 12 VDC adapter. The auto-o feature turns the
meter o after 20 minutes of non-use.
At power on the instrument performs an auto-diagnostic test. All LCD segments are
displayed for a few seconds.
The instrument starts with the previously selected measurement range. The OPEN tag
and the “ ”, “ ” symbols are displayed blinking for a few seconds to remind the user
to unscrew the electrode refilling cap and to remove the protective cap before taking
measurements.
6.2. MOUNTING THE ELECTRODE HOLDER
yTake the MA electrode holder from the box.
yIdentify the metal plate (4) with the integrated pin (5) and the screw (2).
The plate may be attached to either sides of the meter, left (L) or right (R).
yTurn the meter over, with the display facing down.
1
2
3
4
5
6L
6R
RL
yAlign the rubber foot (R or L) with the hole (3) on the plate (4). Make sure the pin(5)
is facing down.
yUse a screwdriver (1) to tighten the screw (2) and lock in place.

GENERAL OPERATIONS 15
yPosition the meter with the display facing up.
yTake the electrode holder (7) and insert it into the pin (5). The pin securely holds the
electrode holder in place.
yFor increased arm rigidity, tighten the metal knobs (8) on both sides.
45
7
8
L
R
6.3. CONNECTING THE PROBES
MAB/1 pH Probe
MAB/1 is connected to the meter through a BNC connector (labeled pH/ORP).
With the meter o:
yConnect the probe to the BNC socket.
yAlign and twist the plug into the socket.
yPlace the probe into the holder and secure the cable in clips.
For electrodes with a separate reference, connect the electrode’s BNC to the BNC connector
and the reference electrode plug to the reference connector (labeled Ref.).
MAR Temperature Probe
MARis connected to the meter through a RCA connector (labeled Temp.)
With the meter o:
yConnect the probe to the RCA socket.
yPush the plug into the socket.
yPlace the probe into the holder and secure the cable in clips.

16 MW160 Bench Meter
6.4. ELECTRODE CARE & MAINTENANCE
Calibrating & Conditioning
Maintaining a pH electrode is critical to ensure proper and reliable measurements. Frequent
two- or three-point calibrations are recommended to ensure accurate and repeatable
results.
Prior to using the electrode for the first time:
1. Remove the protective cap. Do not be alarmed if salt deposits are present, this is
normal. Rinse the electrode with distilled or deionized water.
2. Place the electrode in a beaker containing MA Cleaning solution for a minimum
of 30 minutes.
Note: Do not condition a pH electrode in distilled or deionized water as this will
damage the glass membrane.
3. For refillable electrodes, if the refill solution (electrolyte) has dropped more than
2 ½cm (1”) below the fill hole, add the appropriate electrolyte solution.
4. After conditioning, rinse the sensor with distilled or deionized water.
Note: To ensure quick response and avoid cross‑contamination, rinse the electrode tip
with the solution to be tested before measurement.
Best practices when handling an electrode:
yElectrodes should always be rinsed between samples with distilled or deionized water.
yDo not wipe an electrode as wiping can cause erroneous readings due to static charges.
yBlot the end of the electrode with lint-free paper.
Storage
To minimize clogging and ensure quick response time, the glass bulb and the junction
should be kept hydrated.
Add a few drops of MA Storage solution to the protective cap. Replace the storage
cap when the probe is not in use.
Note: Never store the probe in distilled or deionized water.
Regular Maintenance
yInspect the probe. If cracked, replace the probe.
yInspect the cable. Cable and insulation must be intact.
yConnectors should be clean and dry.
yRinse o salt deposits with water.
yFollow storage recommendations.

GENERAL OPERATIONS 17
For refillable electrodes:
yRefill the electrode with fresh electrolyte solution (see the electrode’s specifications
to select the correct refilling solution).
yKeep the electrode upright for 1 hour.
yFollow the storage procedure above.
If electrodes are not maintained correctly, both accuracy and precision are aected. This
can be observed as a steady decrease in the slope of the electrode.
The slope (%) indicates the sensitivity of the glass membrane, the oset value (mV)
indicates the age of electrode and provides an estimation when the probe needs to be
changed. The slope percentage is referenced to the ideal slope value at 25 °C.
Milwaukee Instruments recommends that the oset does not exceed ±30 mV and that the
slope percentage is between 85–105%.
When the slope value drops below 50 mV per decade (85% slope eiciency) or the oset
at the zero point exceeds ±30mV, reconditioning may improve performance, but a change
of electrode may be necessary to ensure accurate pH measurements.

18 MW160 Bench Meter
7. SETUP
To configure the meter settings, modify default values or set measurement parameters:
yPress and hold SETUP for about 3 seconds to enter Setup mode.
yUse the keys to navigate the menu (view parameters).
yPress CAL to enter Edit mode (modify parameters). The selecied item is displayed
blinking.
yPress RANGE to select between options.
For example, when setting current time, pressing RANGE switches between options
(hour, minutes) to be modified.
yUse the keys to modify values (value being modified is displayed blinking).
yPress GLP/ACCEPT to confirm and save changes (ACCEPT tag is displayed blinking).
yPress CAL to exit Edit mode without saving (return to menu).
yPress SETUP to exit Setup mode.
The Setup menu items with options and default values are detailed here:
Item Description Options Default
OFF
dAY
Calibration alarm time-out (pH range only)
When enabled, a warning will be displayed
after the set number of days from last
calibration has elapsed.
1 to 14 days or OFF OFF
dISP
Display calibration buers (pH range only)
When enabled, the buers used in the
last calibration are displayed on the pH
measurement screen.
ON or OFF ON
IonCG
Ion charge (ISE range only)
Use the following table to select the proper
ion charge.
–2, –1, 1, 2 or UndF UndF
TIME Current time in hh:mm format 00:00 to 23:59 00:00

SETUP 19
Item Description Options Default
DATE Current date in MM.DD.YYYY format 01.01.2000 to 12.31.2099 01.01.2005
bEEP
Beep status
When enabled, an acoustic signal is heard
every time a key is pressed.
ON or OFF OFF
bAud Baud rate for serial communication 600, 1200, 2400, 4800 or
9600 2400
In Id
Instrument ID
When using several identical meters, itmay
be useful to uniquely identify them by
assigning a code to each meter.
0000 to 9999 0000
tEMP Temperature unit °C or °F °C
To help select the proper ion charge, dierent ion types and their charge are listed in the
table below:
Ion Charge Ion Types
–2 (divalent anions) S, CO
–1 (monovalent anoins) F, Cl, Br, I, CN, SCN, ClO, NO
1 (monovalent cations) H, Na, K, Ag, NH
2 (divalent cations) Mg, Ca, Ba, Cd, Cu, Pb
UndF Undefined ion

20 MW160 Bench Meter
8. pH
8.1. PREPARATION
Up to three-point calibration can be performed with a choice of 7 standard buers
(1.68,4.01, 6.86, 7.01, 9.18, 10.01 and 12.45 pH).
1. Prepare two clean beakers. One beaker is for rinsing and one for calibration.
2. Pour small quantities of the selected buer solution into each beaker.
3. Remove the protective cap and rinse the probe with buer solution used for the first
calibration point.
If necessary, press RANGE until the display changes to pH measurement range.
8.2. CALIBRATION
General Guidelines
For better accuracy, frequent calibrations are recommended. The probe should be
recalibrated at least once a week, or:
ywhenever is replaced
yafter testing aggressive samples
ywhen high accuracy is required
ywhen the calibration time out has expired
Procedure
1. Immerse the pH and the temperature probes approximately 4 cm (1 ½”) into the buer
solution and stir gently. Make sure the temperature probe is positioned close to the
pH probe.
2. Press CAL. The CAL, BUFFER, CALIBRATION tags, the buer number and the buer
value (7.01) are displayed along with WAIT tag blinking. If needed, press the keys
to select a dierent buer value.
3. When the reading is stable and close to the selected buer, READY and ACCEPT tags
are displayed blinking. Press GLP/ACCEPT to confirm calibration.