Measurement In Ion Mode - Fisher Scientific accumet AP 110 accumet AP 115 accumet AP 125 Instruction Manual

4. Immerse the ion selective electrode(s) into the
standard solution selected in Step (3) adding ISA
as needed. Provide moderate stirring if possible.
5. Allow the mV value to reach a constant reading
(little variation over 30 seconds as well as the
appearance of the STABLE annunciator). Press
std/enter again to complete standardization of the
value.
standard and returns to the Measure mode.
Successfully standardized buffer values remain on
the display until cleared—even after power off.
6. Repeat steps (2) to (5) with subsequent standards.
The meter will briefly display slope value (in
mV/decade) before returning to the Measure mode.
If this value is not between 15 – 90 mV/decade,
'SLOPE Error' (Electrode error) is displayed. The
standardization value is not accepted and the
instrument returns to the Measure mode.

8.3 Measurement in Ion mode

1. Press mode until the display indicates the Ion
mode. Immerse the electrode(s) into the sample
solution. Stir moderately if possible.
2. Allow the Ion value to reach a constant reading
(little variation over 30 seconds as well as the
appearance of the STABLE annunciator). The Ion
reading may be recorded at this time.
Note: '----' indicates a two point standardization
has not been completed and the Ion reading can
not be determined. See Ion Standardization.
If AUTO is not displayed, the auto read hold
function is not active, and the meter will
continuously monitor the live pH value.
If AUTO is displayed, the meter will lock the
measured value on the screen when the STABLE
annunciator appears. To release the locked value
and obtain a new reading, press setup/meas.
AUTO will flash until a stable reading is obtained
and the new value is locked.
The meter automatically recognizes the
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