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c)
Beckman pH meter, Model 340
i)
Press “CAL”
to initiate the calibration mode.
ii)
Press “CLEAR”
twice to clear the previous calibration.
iii)
Wash the electrode thoroughly with DI•H2O
and immerse in pH 7.00 standard buffer
solution. Push “READ”
and swirl the solution around the bulb of the electrode to speed
equilibration.
This calibration point has been accepted
when the “eye” stops flashing.
iv)
Again, wash the electrode
thoroughly with DI•H2O
and immerse in pH 4.00 standard
buffer solution.
Push “READ” and swirl the solution
around the bulb of the electrode to
speed equilibration.
This calibration point has been accepted
when the “eye” stops flashing.
Record the slope displayed.
v)
Press “CAL”
to end the calibration procedure.
vi)
Rinse and dry the electrode and store
it in the “storage buffer” until required.
