USER MANUAL
pH 55 • pH 56
Pocket-size
pH/°C/°F Meters
www.milwaukeeinst.com
Automatic Temperature Measuring unit
Compansation Indicator on main LCD
Instability Indicator Main LCD
Calibration Indicator Temperature
Low Battery Indicator reading
Secondary LCD
OPERATIONAL GUIDE
• Remove t he electrod e cap and im merse
the m eter in MA9015 storag e soluti on f or
2 hours to activat e the el ec trode.
• Turn the meter on by pressing the
ON/OFF button. All the used segments
on the LCD will be visib le f or 1 sec ond or
as long as the button is pressed.
• Immers e the electr ode in the s olution to
be tested. Stir gently and wait for the
reading to stabilize, i.e. the instability
indicator (hourglass) on the LCD turns
off.
• The pH value is automatically
compensated for tem peratur e and will b e
displayed on the main LCD, while the
temperat ure is shown on the secondary
LCD.
• To freeze the display, while in
measurement mode, press and hold th e
SET/HOLD butt on. The “H O LD” message
appears on the secondary display and
the reading will be frozen on the LCD.
Press an y butt on t o r etur n to normal mod e.
• To turn the meter off, pr ess th e ON/OFF
button. The “OFF” message will appear
on the secondary display. Release the
button.
Note:
• Before taking any measurement, make
sure the met er is c alibrat ed (th e CAL t ag
is on ).
• After use always turn the meter OFF,
rinse th e el ectr ode wit h wat er to mini m ize
contamination and store it with a few
drops of storage (MA9015) or pH7
(M10007) solution in the protective cap.
NEVER USE DISTILLED OR DEIO NIZED
WATER FOR STORAGE PURPOSE.
CALIBRATION PROCEDURE
For better accuracy, f requent cali bration of
the t ester is r ecom mend ed. Cali bration is
also necessary after electrode
replacement, after testing aggressive
chemicals and where extreme accuracy
is required.
• From norm al operation mod e, press and
hold the ON/OFF/CAL button until the
“OFF” message
on the secondary LCD is substituted by
“CAL”. Release the button.
• The instrument enters the calibration
mode by displaying “pH 7.01 USE” (or
“pH 6.86 USE” if the NIST buffer set was
selected).
• F or a single-po int c a l ibr ation, immerse the
electrod e in any buf fer, i. e. pH 4.01, 7.01
(or 6.86), 1 0.0 1 (or 9.1 8) .
• The met er activat es the aut omatic buf fer
recognition. If no valid buf fer is det ected,
the meter keeps the USE indication
act iv e f or 1 2 s econds, and th en replac es
it with W R NG, indic ating th at the sampl e
being measured is not a valid buffer.
Otherwise, if a valid buffer is detected,
then its value is shown on the primary
display, and REC appears on the
secondar y LC D.
• If the pH 7.01 (or pH 6.86) was used,
press the SET button to exit the
Calibration mode and the “OK 1”
messag e will appear on the dis play. T he
first calibration point is stored and the
meter returns to normal measurement
mode.
For better accuracy, it is always
recommended to perform a 2-point
calibration.
• For a two-point c a lib r a t ion, immerse the
electrode in p H 7. 0 1 (or pH 6.86) buffer
solution.
• After the firs t point has been accepted,
the meter will th en ask for t he second
buffer and th e mess age „pH 4. 01 US E”
will appear .
• Rinse the electrode and immerse it in
the secon d soluti on (pH 4. 01, 10.01 or
9.18).
• If a valid buf fer value is detec ted, the
REC message is displayed and the
meter completes the calibration
procedure. The LCD shows the
accepted value with the „OK 2”
messag e and the inst rument r eturns t o
the normal measurement mode.
Otherwise, if no val id buff er is detect ed,
the meter displays the WRNG
message.
Note: When the calibration procedure is
completed, the CAL tag is turned on.
• To quit the proced ure and return to the
last calibration data, after entering the
calibration mode pr ess th e ON /OF F b utt on.
The secondary LCD displays “ESC” for 1
second an d then the meter ret urns to the
normal meas urement m od e.
• To res et to th e defau lt va lues and cl ear a
previous c alibration, press the SET/ HOLD
button after entering the calibration mode
and bef ore the first point is accepted. The
secondary LCD displays “CLR” for 1
second, the meter resets to the default
calibration and the CAL tag on the LCD
turns off.
SETUP
Setup mode allows the selection of
temperature (°C or ° F) and pH buf fer set for
calibration.
To enter the Setup mode, press the
ON/OFF button until “CAL” on the
secondar y LCD is r eplaced by “TEMP” and
the current temperature unit (e.g. TEMP
°C). Then:
• for °C/°F selection: use the SET/HOLD
button; then press the ON/ OF F butt on onc e
to ent er the buf fer set sel ection or t wice to
return to the nor m al m eas urement m od e.
• to change th e calibrat ion buffer set: after
setting th e tem p erature unit, pr ess ON/ OFF
once and select the buffer set (“pH 7.01
BUFF” or “pH 6.86 BUFF” for NIST) by
using the SET/HOLD button. Press
ON/OFF to return to the normal
measurem en t m od e.
ELECTRODE REPLACEMENT
• Remove th e protective c ap and unscrew
the plastic rin g on the top of the elec t r od e.
• Pull out the MI56P electr ode and rep lace
it with a new one.
• Make sure the gaskets are in place before
screwing back the ring.
BATTERY REPLACEMENT
When the batteries become weak, the
battery symbol on the LCD will light up t o
advise that only a f ew h our s of w or ki ng t i m e
is remaining. The meter is also provided
with BEPS (Battery Error Prevention
System), which avoids any erroneous
readings due to low battery level by
automatically switching the meter off.
It is r ecommended to rep lace t he batteri es
immediately.
To replace the batteries unscrew the
battery compartment cap and replace all
four 1. 5 V b at t er i es whil e paying atten tion to
their polarity. Make sure the gasket is in
place before screwing back the cap.
Batteries should only be replaced in a
nonhazardous area using t he battery type
specified in this instruction m an u al.
ACCESSORIES
MI 56P Replaceabl e elec trode f or pH 55 & pH
56
M10004B pH 4.01 buffer, 20 ml sachet, 25 pcs.
M10007B pH 7.01 buffer, 20 ml sachet, 25 pcs.
M10010B pH 10.01 buffer, 20 ml sachet, 25
pcs.
MA9004 pH 4.01 buffer, 230 ml bottle
MA9006 pH 6.86 buffer, 230 ml bottle
MA9007 pH 7.01 buffer, 230 ml bottle
MA9009 pH 9.18 buffer, 230 ml bottle
MA9010 pH 10.01 buffer, 230 ml bottle
MA9015 Electrode storage solution, 230 ml
MA9016 Electrode cleaning solution, 230 ml
M10000B Electr ode ri ns e sol uti on, 20 m l s ac het,
25 pcs.
WARRANTY
This instrument is warranted against
defects in m aterials and manufactur ing for
a period of two years from the date of
purchase. Probe is warranted for 6 months.
If during this period the repair or
rep l ac em ent of par t s is requ ired, where t he
damage is not due to negligence or
erroneous operation by the user, please
return the par ts to either distributor or our
office and the repair will be done free of
charge.
Damages due to accidents, misuse,
tampering or lack of prescribed
maintenance are not covered. Milwaukee
instruments reserves the right to make
improvements in design, construction and
appearance of its produc ts wit hout ad vanc e
notice.
SPECIFICATIONS
RANGE -2.0 to 16.0 pH (pH 55)
-2.00 to 16.00 pH (pH 56)
-5.0 to 60.0°C / 23.0 to 140.0°F
RESOLUTION 0.1 pH (pH 55)
0.01 pH (pH 56)
0.1°C / 0.1°F
ACCURACY (@25°C) ±0.1 pH (pH 55)
±0.05 pH (pH 56)
±0.5°C / ±1°F
TYPICAL EMC DEVIATION
±0.1 pH (pH 55)
±0.02 pH (pH 56)
±0.3°C / ±0.6°F
TEMPERATURE COMPENSATION
Automatic, from -5 to 60°C
CALIBRATION A utomatic, 1 or 2 poi nts
with 2 sets of m emorized buf fers (pH 4. 01,
7.01, 10.0 1 or 4.01, 6.86, 9.18)
PROBE Replaceable MI 56P
ENVIRONMENT -5 to 50°C; 100% RH
max.
BATTERY TYPE 4 x 1.5V; IEC LR44, A76
BATTERY LIFE approx. 300 h ours of use
AUTO-OFF after 8 minutes of non-use
DIMENSIONS 200 x dia 38 mm
WEIGHT 100 g
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