CONDITIONING:
Remove the cap and immerse the
pH51
in
MA9015 storage solution for 2 hours to acti-
vate the electrode.
CALIBRATION:
Unscrew the battery compartment cap on the
top of the meter and perform one of the follow-
ing two-point calibration procedure, according
to the required application:
Acid calibration for measurements below pH7:
• Immerse the electrode in pH7.01
(M10007) buffer solution.
• Allow the reading to stabilize and
with a small screwdriver turn the
“7” calibration trimmer inside the
battery compartment until the dis-
play shows "7.0".
• Rinse the electrode with tap water
and immerse it in pH4.01 (M10004)
buffer solution.
• Allow the reading to stabilize and with a
small screwdriver turn the “4” calibration trim-
mer until the display shows "4.0".
Alkaline calibration for measurements above pH7:
• Immerse the electrode in pH7.01 (M10007)
buffer solution.
• Allow the reading to stabilize and with a
small screwdriver turn the “7” calibration trim-
mer until the display shows "7.0".
• Rinse the electrode with tap water and im-
merse it in pH10.01 (M10010) buffer solution.
• Allow the reading to stabilize and with a
small screwdriver turn the “4” calibration trim-
mer until the display shows "10.0".
Replace the battery compartment cap.
OPERATION:
• Remove the protective cap.
• Turn the
pH51
on by pressing the ON key.
• Immerse the electrode in the solution to be
tested.
• Stir gently and wait for the reading to
stabilize.
• After use, rinse the electrode with wa-
ter to minimize contamination.
• Store the electrode with a few drops of
storage (MA9015) or pH7 (M10007)
solution in the protective cap.
• Always replace the protective cap after use.
NEVER USE DISTILLED OR DEIONIZED WA-
TER FOR STORAGE PURPOSES.
ELECTRODE REPLACEMENT:
The electrode can be easily replaced in the
following way:
• Remove the protective cap.
• Unscrew the plastic ring on the top
of the electrode.
• Pull out the MA73600 (or
MA73600-S) pH electrode and re-
place it with a new one (aligning
the colored pin towards the LCD
side).
• Make sure the gaskets are in place
before screwing back the ring.
BATTERY REPLACEMENT:
pH51
is supplied with BEPS (Battery Error Pre-
venting System) which avoids any erroneous
reading due to low battery level, by switching the
meter off. To replace the batteries unscrew the
battery compartment cap and replace all three
1.5V batteries while paying attention to their po-
larity. Make sure the gasket is in place before
screwing back the cap.
Batteries should only be replaced in a nonhaz-
ardous area using the battery type specified in
this instruction manual.
WARRANTY:
This meter is warranted from all defects in materials and manufacturing
for a period of two years. The electrode is warranted for a period of
one year. During this period, the required repair or replacement of parts,
where the damage is not due to negligence or erroneous operation by the
user, will be effected free of charge.
