OFFSET - Theoretically, when placed in 7.00 buffer at 25°C a pH electrode produces zero millivolts which the pH meter reads as 7.00 pH. The difference between these perfect readings and the electrode''s actual reading is called the offset error.
SPAN - A perfect pH electrode, at 25°C produces 59.12mV per pH unit. The difference between this perfect reading and the electrode''s actual reading is called the span error.
These theoretical values are not always achieved, even with brand new electrodes. New pH electrode performance specifications should meet the following criteria:
Offset: 7.00 +/- 0.2 pH (+/- 12mV)
SPAN: Better than 95% of theory; i.e. between 56.2 and 59.2 mV
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