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 the electrode cap and immerse
the meter in
MA9015
storage solution for
2 hours to activate the electrode.
• Turn the meter on by pressing the
ON/OFF button. All the used segments
on the LCD will be visible for 1 second or
as long as the button is pressed.
• Immerse the electrode in the solution 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 temperature and will be
displayed on the main LCD, while the
temperature is shown on the secondary
LCD.
•
To freeze the display
, while in
measurement mode, press and hold the
SET/HOLD button. The “HOLD” message
appears on the secondary display and
the reading will be frozen on the LCD.
Press any button to return to normal mode.
•
To turn the meter off
, press the ON/OFF
button. The “OFF” message will appear
on the secondary display. Release the
button.
Note:
• Before taking any measurement, make
sure the meter is calibrated (the CAL tag
is on).
• After use always turn the meter OFF,
rinse the electrode with water to minimize
contamination and store it with a few
drops of storage (
MA9015
) or pH7
(
M10007
) solution in the protective cap.
NEVER USE DISTILLED OR DEIONIZED
WATER FOR STORAGE PURPOSE.
CALIBRATION PROCEDURE
For better accuracy, frequent calibration of
the tester is recommended. Calibration is
also necessary
after electrode
replacement, after testing aggressive
chemicals and where extreme accuracy
is required.
• From normal operation mode, 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).
• For a
single-point calibration
, immerse the
electrode in any buffer, i.e. pH 4.01, 7.01
(or 6.86), 10.01 (or 9.18).
• The meter activates the automatic buffer
recognition. If no valid buffer is detected,
the meter keeps the USE indication
active for 12 seconds, and then replaces
it with WRNG, indicating that the sample
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
secondary LCD.
• If the pH 7.01 (or pH 6.86) was used,
press the SET button to exit the
Calibration mode and the “OK 1”
message will appear on the display. The
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 calibration
, immerse the
electrode in pH 7.01 (or pH 6.86) buffer
solution.
•
After the first point has been accepted,
the meter will then ask for the second
buffer and the message „pH 4.01 USE”
will appear.
•
Rinse the electrode and immerse it in
the second solution (pH 4.01, 10.01 or
9.18).
•
If a valid buffer value is detected, the
REC message is displayed and the
meter completes the calibration
procedure. The LCD shows the
accepted value with the „OK 2”
message and the instrument returns to
the normal measurement mode.
Otherwise, if no valid buffer is detected,
the meter displays the WRNG
message.
