wtw NitraLyt 700 IQ, Operating Manual, Page: 22 / 61

Calibration and measuring NitraLyt
®
700 IQ
4 - 2 ba75397d03 12/2004
4.1.2 Overview of the calibration procedures
For nitrate measurements with the NitraLyt
®
700 IQ sensor, the follow-
ing calibration procedures can be selected:
1 point standard (1) 1-point calibration in a standard solution.
1 point ref. (2) 1-point calibration in the test sample. Calibration is carried out deter-
mining the nitrate concentration by an independent reference proce-
dure, e. g. photometry.
2 point stand. (3) 2-point calibration in two standard solutions.
Simple std. add. (4) Calibration in the test sample with a one-time addition of standard solu-
tion.
Double std. add. (5) Calibration in the test sample with a double addition of standard solu-
tion.
Determined calibration
data
Depending on the calibration procedure (single-point or two-point), the
following data are determined during calibrating:
In the calibration log and calibration history (section 4.1.10), the slope
and drift potential are output. The drift potential and slope inform about
the age condition of the electrode.
Note
Single-point calibration procedures take over the slope of the last two-
point calibration. If no valid data from a two-point calibration are avail-
able, the default setting (+59.16 mV) is used. In both cases the value is
marked with * in the calibration history.
Calibration proce-
dures Drift potential: Slope
1 point standard (1)
"
1 point ref. (2)
"
2 point stand. (3)
" "
Simple std. add. (4)
"
Double std. add. (5)
" "