Milwaukee Mi 150 User manual

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Instruction Manual Mi 150 & Mi 151 Bench Meters
FUNCTIONALDESCRIPTION............................................................................................................ 2
GENERALDESCRIPTION................................................................................................................... 4
SPECIFICATIONS...............................................................................................................................5
OPERATIONALGUIDE...................................................................................................................... 6
pH CALIBRATION.............................................................................................................................. 10
pH BUFFERTEMPERATUREDEPENDENCE........................................................................................ 14
SETUP.................................................................................................................................................14
mVCALIBRATION..............................................................................................................................16
TEMPERATURECALIBRATION............................................................................................................ 16
ELECTRODECONDITIONING & MAINTENANCE............................................................................16
TROUBLESHOOTING....................................................................................................................... 18
ACCESSORIES................................................................................................................................... 19
A
B
C
D
E
F
G
H
I
J
K
L
M
N
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P
Q
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DISPLAYDISPLAY
DISPLAYDISPLAY
DISPLAY
A. MEMORY IN DICATO R
B. RECALL MEMO RY VALUE
C. CALIBRATIO N
D. CO N FIRM
E. SETUP
F. METER WO RKING
G. WAITIN G FO R CALIBRATION
H. WRONG BUFFER
I. UP/ DO WN TEMPERATURE
J. PRE-MEMO RIZED BUFFERS
K. FIRST & SECO ND BUFFER
IN DICATOR
L. MAN UAL TEMPERATURE CO MPEN -
SATION MO DE
M. AUTO MATIC TEMPERATURE
COMPENSATION MODE
N. pH MEASURING UN IT
O . mV MEASURIN G UN IT
P. pH OR mV READING
Q . SELECTED BUFFERS
R. UNIT MEASUREMENT
S. READING TEMPERATURE/ BUFFER
CALIBRATIO N
FUNCTIONALDESCRIPTION

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SPECIFICATIONS
Range -2.00 to 16.00 pH
± 699.9 mV / ± 1999 mV (Mi 151Mi 151
Mi 151Mi 151
Mi 151 only)
-20.0 to 120.0 °C (-4.0 to 248.0 °F)
Resolution ± 0.01 pH
0.1 mV / 1 mV (Mi 151Mi 151
Mi 151Mi 151
Mi 151 only)
0.1 °C (0.1 °F)
Accuracy (@ 20 °C / 68 °F) ± 0.01 pH
± 0.2 mV / ± 1 mV (Mi 151Mi 151
Mi 151Mi 151
Mi 151 only)
± 0.4 °C (± 0.8 °F)
Typical EMC Deviation ± 0.02 pH
± 0.2 mV / ± 1 mV (Mi 151Mi 151
Mi 151Mi 151
Mi 151 only)
± 0.4 °C (± 0.8 °F)
pH Automatic Calibration 1 or 2 point-calibration, with 7 memorized buffers
Offset Calibration ± 1 pH
Slope Calibration From 80 to 108%
Temperature Compensation Automatic, from -20.0 to 120.0 °C (-4.0 to 248.0 °F)
or manual, without temperature probe
pH Electrode MA 917B/1 (included)
Temperature Probe MA 831R (included)
Input Impedance Impedance 10
12
ohms
Power supply 12 VDC power adapter
Dimensions 230 x 160 x 95 mm (9.0 x 6.3 x 3.7")
Weight 0.9 kg (2.0 lb.)
Environment 0 to 50 °C ; max RH 95%
Warranty 3 years

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OPERATIONALGUIDE
INITIAL PREPARATIO NINITIAL PREPARATIO N
INITIAL PREPARATIO NINITIAL PREPARATIO N
INITIAL PREPARATIO N
Plug the 12 VDC adapter into 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.
If the probe is disconnected, temperature can be set manually with the UP and DOWN
arrow keys (see page 3 for details). Install electrode holder and turn the instrument ON by
pressing ON/OFF.
At start up the display will show all the used segments for a few seconds(or while the button
is held), and then will enter normal measurement mode.
After measurement switch the meter off, clean the electrode and store it with a few drops
of MA9015MA9015
MA9015MA9015
MA9015 storage solution in the protection cap.
The auto-off feature turns the meter off after 20 minutes of non-use. To disable this
feature, see SETUPmenu on page 14.
pHpH
pHpH
pH MEASUREMEN TSMEASUREMENTS
MEASUREMENTSMEASUREMENTS
MEASUREMENTS
To take a pH measurement remove the electrode protective cap and simply submerge the
tip (4cm/ 1½") of the electrode and the temperature probe into the sample to be tested.
If necessary, press the RANGE key (Mi 151Mi 151
Mi 151Mi 151
Mi 151 only) until the display changes to the pH mode.
Allow for the electrode to adjust and reading to stabilize (hourglass symbol turns off).
The LCD will show the measured pH value on the primary LCD and the temperature of the
sample on the secondary LCD.
In order to take more accurate pH measurements, make sure that the instrument is
calibrated (see page 10 for details).
It is recommended that the electrode is always kept wet and rinsed thoroughly with the
sample to be measured before use. The pH reading isdirectly affected by temperature.
Instruction Manual Mi 150 & Mi 151 Bench Meters

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In order for the instrument to measure the pH accurately, temperature must be taken into
consideration. If the sample temperature is different from the temperature at which the pH
electrode was kept, allow a few minutes to reach thermal equilibrium.
To use the meter's Automatic Temperature Compensation feature, submerge the tempera-
ture probe into the sample as close to the electrode as possible and wait for a few
seconds.
If manual temperature compensation (MTC) isdesired, the temperature probe must be discon-
nected from the instrument.
The display will show the default temperature of 25 °C or the last temperature set with the
"°C" (or "°F") indicator blinking.
The “MTC” tag and up & down arrows symbols light up on the LCD to indicate that the
instrument is in MTC mode and the arrow keys can be used to enter the desired
temperature value.
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NoteNote
NoteNote
Note: When in MTC the user can press and hold the arrow keys, and the instument will start
incrementing/decrementing the temperature value. The meter keepsmeasuring and
the display is updated every second.
O RP MEASUREMEN TS (MO RP MEASUREMEN TS (M
O RP MEASUREMEN TS (MO RP MEASUREMEN TS (M
O RP MEASUREMEN TS (Mi 151 onlyi 151 only
i 151 onlyi 151 only
i 151 only))
))
)
To perform ORPmeasurements, connect an optional ORPelectrode (see "Accessories" section for
code) to the instrument and turn it ON.
If necessary, enter the mV mode by pressing the RANGE key until the display changes
to mV.
Submerge the ORP electrode tip (4 cm/1½") into the sample to be tested and wait a few
minutes for the reading to stabilize.
Measurements within the ± 699.9 mV range are displayed with 0.1 mV resolution, while
outside this range the resolution automatically switches to 1 mV.
The LCD will show the measured mV value on the primary LCD and the temperature of the
sample on the secondary LCD.
The “ATC” (or “MTC”) tag is turned off because mV readings are not temperature
compensated.
For accurate ORP measurements, the surface of the electrode must be clean and smooth.
Pretreatment solutions are available to condition the electrode and improve its response time
(see "Accessories" section).
NotesNotes
NotesNotes
Notes:
• When the reading isout of range, the display will flash the closest full-scale value.
• If using pH electrode while in mVmode, the instrument will measure the mVgenerated by the
pH electrode.
Instruction Manual Mi 150 & Mi 151 Bench Meters

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MEM & MR FUNCTIO NSMEM & MR FUNCTIO NS
MEM & MR FUNCTIO NSMEM & MR FUNCTIO NS
MEM & MR FUNCTIO NS
From normal measurement mode, pressing the MEM key will freeze the readings on the
display and store into internal memory the current values (pH and temperature, or mV and
temperature).
The “MEM” tag blinks and the display remains frozen until the MEM key is pressed again.
N o teN o te
N o teN o te
N o te: While in MEM mode, the user can switch between pH and mV by pressing the
RANGE key (Mi 151Mi 151
Mi 151Mi 151
Mi 151 only).
Last stored value can be recalled by pressing the MR key: the LCD will show the value,
together with the “RCL” and “MEM” tags, as long as the MRkey is pressed.
N o teN o te
N o teN o te
Note: Pressing MR, only the range that was active at the time MEM was pressed is shown
(Mi 151Mi 151
Mi 151Mi 151
Mi 151 only).
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1 01 0
1 01 0
1 0
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) When the calibration time out is expired (if feature is enabled).
PRO C ED UREPRO C ED URE
PRO C ED UREPRO C ED URE
PRO C ED URE
One or two-point calibration can be performed, using 7 pre-memorized buffers (1.68, 4.01,
6.86, 7.01, 9.18, 10.01 and 12.45 pH).
• Pour small quantities of selected buffer solutions into clean beakers. For accurate calibration
use two beakersfor each buffer solution, the first one for rinsing the electrode and the second
one for calibration.
• Remove the protective cap and rinse the electrode with some of the buffer solution to be
used for the first calibration point.
TWO -PO INT CALIBRATIO NTWO -PO INT CALIBRATIO N
TWO -PO INT CALIBRATIO NTWO -PO INT CALIBRATIO N
TWO -PO INT CALIBRATIO N
• Press the CALkey. The “CAL” and “ ” indicatorswill be displayed. The secondary LCD
will display buffer “7.01”. If a different calibration buffer is desired (i.e. “6.86”), use the
UPand DOWN arrow keys to change the displayed value.
• Submerge the electrode approximately4 cm (1½") into the solution, place the temperature
probe as close to the electrode as possible and stir gently.
• The LCD will flash “NOT READY” for 12 seconds, then:
if the reading isnot close to the selected buffer, “WRONG ” and “WRONG ” will blink
alternatively;
Instruction Manual Mi 150 & Mi 151 Bench Meters