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 meters.

3
TABLE OF CONTENTS
1. FUNCTIONAL DESCRIPTION......................................................................................................................................4
2. GENERAL DESCRIPTION.............................................................................................................................................6
3. SPECIFICATIONS............................................................................................................................................................. 7
4. OPERATIONAL GUIDE...................................................................................................................................................8
5. pH CALIBRATION ...........................................................................................................................................................11
6. pH BUFFER TEMPERATURE DEPENDENCE....................................................................................................14
7. RELATIVE mV CALIBRATION....................................................................................................................................15
8. ISE CALIBRATION .........................................................................................................................................................16
9. GOOD LABORATORY PRACTICE (GLP)..............................................................................................................19
10. LOGGING ........................................................................................................................................................................24
11. SETUP ...............................................................................................................................................................................28
12. mV CALIBRATION (for technical personnel only)..................................................................................30
13. TEMPERATURE CALIBRATION (for technical personnel only).........................................................31
14. PC INTERFACE.............................................................................................................................................................32
15. ELECTRODE CONDITIONING & MAINTENANCE.........................................................................................34
16. TROUBLESHOOTING.................................................................................................................................................36
17. ACCESSORIES............................................................................................................................................................... 37
CERTIFICATION..................................................................................................................................................................38
RECOMMENDATION........................................................................................................................................................38
WARRANTY..........................................................................................................................................................................38

4MW160 Bench Meter
1. FUNCTIONAL DESCRIPTION
DISPLAY
H
I
J
K
L
B
A
B
C
D
E
F
G
A. Primary display
B. Measuring unit for primary display
C. Calibration messages
D. Memorized ph calibration buers
E. Calibration tags
F. Mode indicators
G. Require user confirmation
H. Calibration messages
I. Temperature compensation mode indicator
J. Secondary display
K. Measuring unit for secondary display
L. Calibration requested

FUNCTIONAL DESCRIPTION 5
FRONT PANEL
1. Liquid Crystal Display (LCD)
2. CAL key, to enter/exit calibration
mode
3. MR key, to enter/exit memory recall
4. GLP/ACCEPT key, to display GLP
data or to confirm value
5. LOG/CLR key, to store reading in
memory or to clear calibration
6. SETUP key, to enter/exit setup
mode or to toggle between delete
one and all logged data
7. RANGE key, to select measurement
range or to switch focused data.
8. UP and DOWN arrow keys, to
manually increase/decrease
temperature or other parameters
value
9. ON/OFF key, to turn the meter ON
and OFF
10. Secondary LCD
11. Primary LCD
REAR PANEL
12. USB connector
13. RS232 connector
14. Power supply socket
15. Reference electrode socket
16. BNC electrode connector
1 7. Temperature probe socket
2
3
4
1
5
9
7
10
11
8
6
RS232
USB
pH/ORP
Ref.
Temp.
Power
12Vdc
14
12
13
15
16
17

6MW160 Bench Meter
2. GENERAL DESCRIPTION
Thank you for choosing Milwaukee Instruments. This instruction manual will provide you
the necessary information for correct use of the meter.
MW160 is a logging microprocessor-based pH, ORP, ISE and temperature bench meter.
This meter is provided with a series of new diagnostic features which add an entirely
new dimension to the measurement of pH/ORP/ISE, by allowing the user to dramatically
improve the reliability of the measurement:
y7 memorized buers (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01 and 12.45) for pH calibration
ypH calibration up to 3 points
yISE calibration up to 2 points; six standard solutions available: 0.01, 0.1, 1, 10, 100, 1000
ppm
yMessages on the LCD to make the calibration easy and accurate
yRelative mV feature
yGLP feature, to view last calibration data for pH or ISE
yUser-selectable alarm time out to alert the user that too much time elapsed since the
last pH calibration
yLog-on-demand (50 samples for each range: pH, mV/RelmV, ISE)
Moreover, it oers an extended temperature range from –20°C (–4 °F) to 120°C (248 °F),
using MA831R interchangeable temperature probe.
For accurate measurements, use the electrode holder supplied with the meter.
This Bench Meter is supplied with:
yMA917B/1 pH Electrode
yMA831R Temperature Probe
yMA9315 Electrode Holder
yM10004 pH 4.01 Sachet Buer Solution
yM10007 pH 7.01 Sachet Buer Solution
yM10010 pH 10.01 Sachet Buer Solution
yM10016 Sachet Electrode Cleaning Solution
yMi5200 Application Software
yMA9350 RS232 Connector cable (2 meters)
yGraduated Pipette
y12 VDC Adapter
yInstruction Manual

SPECIFICATIONS 7
3. SPECIFICATIONS
Range
-2.00 to 16.00 pH
±699.9 mV / ±2000 mV
0.001 to 19999 ppm (ISE)
-20.0 to 120.0°C (-4.0 to 248.0 °F)
Resolution
0.01 pH
0.1 mV / 1 mV
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
0.1°C (0.1 °F)
Accuracy (@ 20°C / 68 °F)
±0.01 pH
±0.2 mV / ±1 mV
±0.5% F.S. (ISE)
±0.4°C (±0.8 °F)
RelmV oset ±2000 mV
pH Calibration 1, 2 or 3 points calibration, with 7 memorized buers
ISE Calibration 1 or 2 points calibration, 6 standard solutions available
Temperature Compensation Automatic, from -20.0 to 120.0°C (-4.0 to 248.0 °F)
or manual, without temperature probe
pH Electrode MA917B/1 (included)
Temperature Probe MA831R (included)
Input Impedance 1012 ohm
Power supply 12 VDC power adapter
Dimensions 230 x 160 x 95 mm (9.0 x 6.3 x 3.7”)
Weight 1.1 kg (2.4 lb.)
Environment 0 to 50°C ; max RH 95%
Warranty 3 years
This instrument is in compliance with the CE Directives.

8MW160 Bench Meter
4. OPERATIONAL GUIDE
INITIAL PREPARATION
Plug the 12 VDC adapter to the power supply socket. To prepare the instrument for
use, connect the pH electrode to the BNC connector and the temperature probe to the
appropriate socket on the rear panel of the instrument. The temperature probe is used in
conjunction with the pH electrode to utilize the instrument’s ATC capability, but it can also
be used independently to take temperature measurements.
For electrodes with a separate reference, connect the electrode’s BNC to the BNC
connector and the reference electrode plug to the reference socket.
For temperature measurements and automatic temperature compensation connect
the temperature probe to the appropriate socket. After measurement switch the meter
o, clean the electrode and store it with a few drops of MA9015 storage solution in the
protection cap. The auto-o feature turns the meter o after 20 minutes of non-use. To
disable this feature, see SETUP.
The instrument enters the same range and mode as it was at power o, while the “OPEN”
tag and the “ ” and “ ” symbols from the electrode blink on the LCD for a few seconds
to remind the user to unscrew the electrode refilling cap, and to remove the protective
cap before taking measurements.
pH MEASUREMENTS
Make sure the instrument has been calibrated before taking pH measurements.
ySubmerge the tip of the electrode (4cm/1½”) and the temperature probe into the
sample to be tested and stir gently. Allow for the electrode to stabilize.
yIf necessary, press the RANGE key until the display changes to pH mode.
yThe pH measurement is displayed on the primary LCD and the temperature on the
secondary LCD.
yIf the reading is out of range, the closest full-scale value will blink on the primary LCD.

OPERATIONAL GUIDE 9
If measurements are taken successively in dierent samples, it is recommended to rinse
the electrode thoroughly with water and then with some of the sample to be tested.
The pH reading is aected by temperature. In order to measure the pH accurately,
the temperature eect must be compensated. To use the Automatic Temperature
Compensation (ATC) feature, connect and submerge the MA831R temperature probe into
the sample as close as possible to the electrode and wait for a few seconds. The “ATC” tag
will be displayed.
If Manual Temperature Compensation (MTC) is desired, the temperature probe must be
disconnected from the instrument.
The display will show the default temperature of 25°C or the last temperature reading
with the blinking “MTC” and “°C” (or “°F”) tags.
The temperature can now be adjusted with the UP and DOWN arrow keys (from –20.0°C to
120.0°C).
mV / RELmV MEASUREMENTS
An optional ORP electrode must be used to perform ORP measurements (see
ACCESSORIES).
Oxidation-Reduction Potential (ORP) measurements provide the quantification of the
oxidizing or reducing power of the tested sample.
To perform an ORP measurement correctly, the surface of the electrode must be clean and
smooth.
yIf necessary, press the RANGE key until the display changes to mV/RelmV.
ySubmerge the ORP electrode tip (4cm/1½”) into the sample to be tested and allow a
few seconds for the reading to stabilize.

10 MW160 Bench Meter
yThe instrument displays the mV reading on the primary LCD or RelmV reading if a
RelmV calibration has been performed and the temperature on the secondary LCD.
or
Notes:
When the reading is out of range, the closest full-scale value is displayed blinking.
If using a pH electrode while in mV mode, the instrument will measure the mV generated
by the pH electrode.
If the instrument displays a RelmV reading and it is desired to take mV measurements,
simply clear the RelmV calibration (see RelmV calibration section).
ISE MEASUREMENTS
yPress the RANGE key to enter ISE measurement mode.
ySubmerge the tip of the ISE electrode (4 cm/1½”) into the sample to be tested and
allow a few seconds for the reading to stabilize.
yThe instrument displays the ppm reading on the primary LCD and the temperature on
the secondary LCD.

pH CALIBRATION 11
5. pH CALIBRATION
It is recommended to calibrate the instrument frequently, especially if high accuracy is
required.
The pH calibration is also necessary in the following cases:
a. Whenever the pH electrode is replaced.
b. At least once a week.
c. After testing aggressive chemicals.
d. When extreme accuracy is required.
e. If “CALIBRATION EXPIRED” tag is blinking during measurement.
Every time you calibrate the instrument use fresh buers and perform an electrode
Cleaning Procedure (see ELECTRODE CONDITIONING & MAINTENANCE).
PROCEDURE
One, two or three points calibration can be performed, from the 7 memorized buers (1.68,
4.01, 6.86, 7.01, 9.18, 10.01 and 12.45 pH).
yPour small quantities of selected buer solutions into clean beakers. For accurate
calibration use two beakers for each buer solution, the first one to rinse the electrode
and the second one for calibration.
yRemove the protective cap and rinse the electrode with some of the buer solution to
be used for the first calibration point.
THREE-POINT CALIBRATION
yImmerse the pH electrode and the temperature probe approximately 4 cm (1½”) into a
buer solution of your choice (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01 or 12.45) and stir gently.
The temperature probe should be close to the pH electrode.
yPress the CAL key. The “CAL”, “1” and “CALIBRATION” tags will appear and the secondary
LCD will display buer “7.01”.
yIf necessary, press the UP and DOWN arrow keys to select a dierent buer value.
yThe “WAIT” tag will blink on the LCD until the reading is stable.

12 MW160 Bench Meter
yWhen the reading is stable and close to the selected buer, the “READY” and “ACCEPT”
tags will blink on the LCD.
yPress the GLP/ACCEPT key to confirm calibration.
yThe calibrated value will be displayed on the primary LCD and the second expected
buer value on the secondary LCD, along with the tag of the buer already calibrated.
yAfter the first calibration point is accepted, immerse the pH electrode and the
temperature probe approximately 4 cm (1½”) into the second buer solution and stir
gently. The temperature probe should be close to the pH electrode.
yIf necessary, press the UP and DOWN arrow keys to select a dierent buer value.
yThe “WAIT” tag will blink on the LCD until the reading is stable.
yWhen the reading is stable and close to the selected buer, the “READY” and “ACCEPT”
tags will blink on the LCD.
yPress the GLP/ACCEPT key to confirm calibration.
yThe calibrated value will be displayed on the primary LCD and the third expected buer
value on the secondary LCD, along with the tags of the buers already calibrated.
yAfter the second calibration point is accepted, immerse the pH electrode and the
temperature probe approximately 4 cm (1½”) into the third buer solution and stir
gently. The temperature probe should be close to the pH electrode.
yIf necessary, press the UP and DOWN arrow keys to select a dierent buer value.
yThe “WAIT” tag will blink on the LCD until the reading is stable.
yWhen the reading is stable and close to the selected buer, the “READY” and “ACCEPT”
tags will blink on the LCD.

pH CALIBRATION 13
yPress the GLP/ACCEPT key to confirm calibration.
yThe instrument stores the calibration values and returns to normal measurement mode.
Notes:
The instrument automatically skips the buers already used for the previous calibration
points to avoid erroneous procedure.
If the value measured by the instrument is not close to the selected buer, “WRONG
BUFFER” and “WRONG PROBE” messages will blink alternately. In this case, check if
the correct buer has been used or regenerate the electrode by following the Cleaning
Procedure (see ELECTRODE CONDITIONING & MAINTENANCE). If necessary, change the
buer or the electrode.
If “WRONG BUFFER” and “Old” messages on the secondary LCD are displayed blinking,
an inconsistency between new and previous (old) calibration is detected. Clear
calibration parameters by pressing the LOG/CLR key and proceed with calibration
from the current calibration point (the instrument will keep all confirmed values during
current calibration).
The “WRONG BUFFER” message and the temperature value blink if temperature reading
is out of the defined temperature range for the buer. Calibration cannot be confirmed
in this situation.
Press the RANGE key to display the temperature reading during calibration.
To clear a previous calibration and return to the default values, press the LOG/CLR key
at any time after entering calibration mode. The LCD will show “CLr CAL” for one second,
and then the meter will return to normal measurement mode.
1 OR 2 POINT CALIBRATION
yProceed as described in “Three-point calibration” section.
yPress the CAL key after the appropriate calibration point is accepted.
The instrument will return to measurement mode, will memorize the calibration data, and
the appropriate tags for the calibrated buers will be displayed on the LCD only if the
“disp” option from the SETUP menu is ON (see SETUP).

14 MW160 Bench Meter
6. pH BUFFER TEMPERATURE DEPENDENCE
The temperature has an eect on pH. The calibration buer solutions are aected by
temperature changes to a lesser degree than normal solutions. During calibration the
instrument will automatically calibrate to the pH value corresponding to the measured
or set temperature.
During calibration the instrument will display the pH buer value at 25°C.
TEMP pH BUFFERS
°C °F 1.68 4.01 6.86 7. 0 1 9.18 10.01 12.45
032 1.67 4.01 6.98 7.1 3 9.46 10.32 13.38
541 1.67 4.00 6.95 7.1 0 9.39 10.24 13.18
10 50 1.67 4.00 9.92 7.07 9.33 10.18 12.99
15 59 1.67 4.00 6.90 7. 0 5 9.27 10.12 12.80
20 68 1.68 4.00 6.88 7. 0 3 9.22 10.06 12.62
25 77 1.68 4.01 9.86 7.0 1 9.18 10.01 12.45
30 86 1.68 4.02 6.85 7. 0 0 9.14 9.96 12.29
35 95 1.69 4.03 6.84 6.99 9.11 9.92 12.13
40 104 1.69 4.04 6.84 6.98 9.07 9.88 11.98
45 113 1.70 4.05 6.83 6.98 9.04 9.85 11.83
50 122 1.71 4.06 6.83 6.98 9.01 9.82 11.70
55 131 1.72 4.08 6.84 6.98 8.99 9.79 11.57
60 140 1.72 4.09 6.84 6.98 8.97 9.77 11.44
65 149 1.73 4.11 6.84 6.99 8.95 9.76 11.32
70 158 1.74 4.12 6.85 6.99 8.93 9.75 11.21
75 167 1.76 4.14 6.86 7. 00 8.91 9.74 11.10
80 176 1.77 4.16 6.87 7. 01 8.89 9.74 11.00
85 185 1.78 4.17 6.87 7.0 2 8.87 9.74 10.91
90 194 1.79 4.19 6.88 7.0 3 8.85 9.75 10.82
95 203 1.81 4.20 6.89 7. 0 4 8.83 9.76 10.73

RELATIVE mV CALIBRATION 15
7. RELATIVE mV CALIBRATION
yPress the CAL key when the instrument is in mV / RelmV measurement mode. The
“CALIBRATION” tag will appear on the LCD.
yRelative mV value is displayed on the primary LCD and the absolute mV value on the
secondary LCD.
yThe “WAIT” tag will blink until the reading is stable.
yWhen the absolute reading is stable and in measurement range, the “READY” and
“ACCEPT” tags blink on the LCD, asking for confirmation.
yIf the reading is out of range, the absolute mV value and the “WRONG” tag will blink.
yPress the GLP/ACCEPT key to confirm the calibration. The instrument enters RelmV
measurement mode.
Notes:
If a RelmV calibration is performed, the range changes from mV to RelmV.
To return to mV measurement mode, clear the RelmV calibration by pressing LOG/CLR
after entering calibration mode. The “CLr CAL” message will appear on the LCD for one
second and the instrument will enter mV measurement mode.

16 MW160 Bench Meter
8. ISE CALIBRATION
For greatest accuracy, it is recommended to calibrate the instrument frequently.
Due to electrode conditioning time, the electrode must be kept immersed a few seconds
to stabilize.
PROCEDURE
One or two-point calibration can be performed, with six memorized standards: 0.01, 0.1, 1,
10, 100 and 1000 ppm.
In SETUP menu, select the proper ion charge.
Note: If “UndF” option is selected in SETUP menu, calibration must be performed in two
points, otherwise “----” will be displayed on the LCD if exiting calibration after accepting
the first used standard.
yPour small quantities of the standard solutions into clean beakers. If possible, use
plastic beakers to minimize any EMC interferences. For accurate calibration use two
beakers for each standard solution: one to rinse the electrode and one for calibration.
ySelect ISE measurement range by pressing the RANGE key. Remove the protective cap
from the ISE electrode
TWO-POINT CALIBRATION
yImmerse the ISE electrode approximately 4 cm (1½”) into the selected solution and
stir gently.
yPress the CAL key. The primary LCD will display the ppm value using the current oset
and slope. The “CAL”, “BUFFER”, “1”, “CALIBRATION” tags will appear and the “0.010” ppm
standard will be displayed on the secondary LCD.
yIf necessary, press the UP and DOWN arrow keys to select a dierent standard value.
yThe “WAIT” tag will blink on the LCD until the reading is stable.

ISE CALIBRATION 17
yWhen the reading is stable and close to the selected standard, the “READY” and
“ACCEPT” tags will blink.
yPress the GLP/ACCEPT key to confirm calibration.
yThe calibrated value will be displayed on the primary LCD and the second expected
standard value on the secondary LCD.
Note: The instrument will automatically skip the standard used for the first point.
yAfter the first calibration point is accepted, immerse the ISE electrode approximately
4cm (1½”) into the second calibration solution.
yIf necessary, press the UP and DOWN arrow keys to select the standard value.
yThe “WAIT” tag will blink on the LCD until the reading is stable.
yWhen the reading is stable and close to the selected standard, the “READY” and
“ACCEPT” tags will blink.
yPress the GLP/ACCEPT key to confirm calibration.
yThe instrument stores the calibration value and returns to normal measurement mode.
Notes:
If the mV value is out of the mV range (±2000), the closest full-scale value will be
displayed blinking.
If the new slope is out of the slope window, “WRONG BUFFER” and “WRONG PROBE”
messages will blink alternately. In this case, check if the correct standard has been
used or refresh the electrode by following the ceaning procedure. If necessary, change
the standard or the electrode.

18 MW160 Bench Meter
The slope window is within ±20 mV and ±105 mV if ion charge is not specified (UndF
option in SETUP menu), or between 50% and 120% of default slope for the corresponding
ion charge.
Default slope values (mV/decade):
– 59.16 (monovalent anion) - ion charge is –1
59.16 (monovalent cation) - ion charge is 1
– 29.58 (divalent anion) - ion charge is –2
29.58 (divalent cation) - ion charge is 2
100 - ion charge is “UndF”
Press LOG/CLR during calibration if you want to clear calibration data and return to
the default values. The instrument will display “CLr CAL” message and then return to
measurement mode.
Press the RANGE key to display temperature reading during calibration.
ONE-POINT CALIBRATION
yPress the CAL key after first calibration point is accepted. The instrument memorizes
the onepoint calibration data and returns to measurement mode.

GOOD LABORATORY PRACTICE (GLP) 19
9. GOOD LABORATORY PRACTICE (GLP)
GLP is a set of functions that allows storage and retrieval of calibration data and electrode
status. All data regarding pH and ISE calibration is stored for the user to review when
necessary.
CALIBRATION ALARM TIME-OUT
For pH calibration, MW160 allows the user to set the number of days (1 to 14) before the
next required calibration. The default setting is OFF (disabled).
The instrument checks the time-out and out the time elapsed, the “CALIBRATION EXPIRED”
message will blink as a reminder.
Note: If the instrument is not calibrated, the “CALIBRATION EXPIRED” message will be
displayed even if the calibration time-out feature is disabled in SETUP menu.
LAST pH CALIBRATION DATA
pH calibration data is stored automatically after a successful calibration.
To view the last pH calibration data, press the GLP/ACCEPT key while in pH measurement
mode.
The instrument will display the time (hh:mm:ss) of the last calibration.
Press the arrow keys and the instrument will display the next calibration parameter
(pressing the UP key):
yThe date (MM.DD.YYYY).

20 MW160 Bench Meter
yThe pH calibration slope value on the primary LCD and the oset on the secondary
LCD.
The pH calibration buers in calibrating order.
yThe first pH calibration buer:
yThe second pH calibration buer:
yThe third pH calibration buer:
Notes:
The “OLd” message displayed beneath the pH value means that this buer was not used
during last calibration. Press SETUP if you want to see calibration date (or time if old
calibration was performed in the same day with current calibration).