Martini & Rossi pH 55, pH 56 User Manual

USER MANUAL

pH 55 • pH 56

Pocket-size

pH/°C/°F Meters

www.martini-instruments.com

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 fro-

ISTPH56R2 05/05

zen 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.

Note: When the calibration procedure is com-

pleted, the CAL tag is turned on.

• To quit the procedure and return to the last
calibration data, after entering the calibration
mode press the ON/OFF button.
The secondary LCD displays “ESC” for 1
second and then the meter returns to the
normal measurement mode.

• To reset to the default values and clear a
previous calibration, press the SET/HOLD
button after entering the calibration mode and
before 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 buffer set for calibration.

To enter the Setup mode, press the ON/OFF
button until “CAL” on the secondary LCD is
replaced 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/OFF button once to
enter the buffer set selection or twice to return
to the normal measurement mode.

• to change the calibration buffer set: after
setting the temperature unit, press 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 measurement mode.

ELECTRODE REPLACEMENT

• Remove the protective cap and unscrew the
plastic ring on the top of the electrode.

• Pull out the MI56P electrode and replace 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 to advise that
only a few hours of working time 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 recommended to replace the batteries im­mediately.

To replace the batteries unscrew the battery
compartment cap and replace all four 1.5V bat­teries while paying attention 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 the battery type specified
in this instruction manual.

ACCESSORIES

MI 56P Replaceable electrode for 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.

MA 9004 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 Electrode rinse solution, 20 ml sa-

chet, 25 pcs.

WARRANTY

This instrument is warranted against defects in mate­rials and manufacturing for a period of two years
from the date of purchase. Probe is warranted for 6
months.
If during this period the repair or replacement of parts
is required, where the damage is not due to negli­gence or erroneous operation by the user, please
return the parts 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/Martini instruments reserves the right to make
improvements in design, construction and appearance
of its products without advance 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 Automatic, 1 or 2 points

with 2 sets of memorized buffers

(pH 4.01, 7.01, 10.01 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 hours of use
AUTO-OFF after 8 minutes of non-use
DIMENSIONS 200 x dia 38 mm
WEIGHT 100 g