RADIOMETER ABL800 FLEX, Reference Manual

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ABL800 FLEX Reference Manual 1. Potentiometric measuring principles
General information,
Continued
Calibration
materials The following calibration materials are used:
Calibration Material Used for...
Calibration Solutions 1 and 2: the exact composition of
the calibration solutions is given in the barcode on the
bottle label, which can be read into the analyzer using the
barcode reader, or entered manually via the keyboard. Calibration of the pH,
and electrolyte
electrodes
Gas 1 and Gas 2: each gas has a precise composition
essential for determining the accuracy of the analyzer in
each
p CO
2
measurement; the exact composition of the
calibration solutions is given in the barcode on the bottle
label, which can be read into the analyzer using the
barcode reader, or entered manually via the keyboard.
Calibration of the
p CO
2
electrode
The Chemical Reference Laboratory at Radiometer is responsible for the accuracy
of the calibrating solutions. Traceability certificates for the individual solutions are
enclosed in Chapter 7:
Solutions and Gas Mixtures .
Measuring time The measuring time of the electrode is independent of the electrode type. Electrode
signals are registered at 0.982 second intervals during both calibrations and
measurements. The registration of each electrode signal begins after the samples,
calibration solutions, and calibration gases are in position in the measuring
modules. The duration of each calibration is predetermined, as is the number of
updatings of the electrodes’ signals.
In general, the updatings from an electrode response are numbered from 1 to upd.
last , where updating number 1 is the first updating and upd.last is the last. The
diagram below schematically illustrates the electrode response that is calculated on
uncorrected electrode updating values.
Updatings
Signal
Updatings
Upd. 1 Upd. last
1-7