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109117-1 Rev. A, 10/96
3.2 Operating Hints (cont)
6. Do not use calibration buffers after the expiration date
printed on the package. Keep the bottles tightly capped
and stored according to the manufacturer's instructions.
Never put used buffer back into the bottle of new buffer.
7. For small sample volumes, make sure that both the pH
bulb and the reference junction are in contact with the
sample.
8. Response time is a function of both the electrode and the
solution. Some solutions have very fast response while
others, particularly those with low ionic strength, may take
several minutes.
9. Samples must be in solution (water). You cannot measure
the pH of a dry sample.
Refer to the electrode manufacturer's instructions for proper
electrode care and maintenance. See Sections 3.3.2 for general
electrode maintenance and Section 3.4.4 for problem solving.
3.3 Maintenance
3.3.1 Meter Maintenance
The Model 430 Meter needs no maintenance except for an
occasional wipe with a damp cloth. The front panel is made of
polyester and is not affected by most solvents. Polyester is known
to be affected by some organic solvents, including toluene, xylene
and methyl-ethyl-ketone. It is good laboratory practice to wipe
away any spills as soon as they occur.
3.3.2 Electrode Maintenance
CAUTION Solutions used to clean electrodes must be handled
with the care accorded to toxic or corrosive
substances.
• Do not allow the reference chamber of the electrode to dry
out. Always keep it filled with the proper fill solution.
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