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APPENDIX
A.1
Inferred Units
In normal mode of operation the instrument is calibrated in
mg/l dissolved organic carbon. However, the monitor can be
configured to display values in one of four inferred units. The
value is calculated by the instrument using a conversion factor
shown below.
With the exception of 1, the conversion factor needs to be
determined by laboratory analysis of the actual sample and it
assumes that the factor is constant.
When using these inferred units it must always be
remembered that the instrument only measures absorbance of
dissolved organics at 254nm. Therefore, if the conversion
factor changes, the instrument readings may not agree with
independent laboratory results until a new conversion factor is
entered.
Note
. When the above inferred units are selected, the
alarm settings, current output range and the calibration
solution values remain in mgl
–1
dissolved organics.