LABEC M-MIA-A - Manual (Page 89)

Ultrasonic milk analyser
Immerse the electrode far enough into the solution to insure the reference
junction is below the surface.
Allow adequate time for the electrode to stabilize in standards and samples
before taking a reading.
Clean the electrode periodically. Allow more time for aged electrodes.
Do not use the pH electrode in solutions of fluoride ion at low pH. This will
etch the glass membrane.
Sulphide vapors can permeate the electrode wick and contaminate the
reference element. Minimize contact in such environments and change the
reference electrolyte frequently.
6. PH measuring.
Measuring pH is an additional feature of the analyzer and is optional.
Remove the protective rubber cap of the pH electrode. Take care to handle it
appropriate in order not to be damaged. Use de-ionized or distilled water to
rinse the electrode before usage. Fill in the sample holder with milk, put it in
the recess of the analyzer and dip the pH electrode into the milk sample,
ensuring complete dip of the electrode in the sample. Stir gently for
homogenization of the sample.
Measuring can be done in two modes:
Off line by starting the menu pH & Co Meter | Measuring, when the
analyzer works only as a pH meter.
On line automatic pH measuring, when measuring the rest of the sample’s
parameters.
After starting the menu pH & Co Meter the following message appears on
the display:
pH Calibration
pH Measuring
pH En/Disable
pH U Display
------------------------------
Co Meter Calibr
Co Meter Test
Co Meter En/Dis
Exit
Operation manual MRC.VER.01-02.10