YSI IQ S ENSOR N ET NitraVis 70x IQ TS - Manual (Page 24)

Measuring / Operation
NitraVis 70x IQ TS
4 - 2 ba75950e02 11/2012
4.2 Measuring operation
CAUTION
Never look into the measuring window or put objects into the measur-
ing window during operation! The emitted UV radiation can damage the
eyes!
In the case of authorized use, inadvertent eye contact with the light
beam is not possible.
Measured value display
Fig. 4-2 NitraVis 70x IQ TS in the measured value display with main and secondary
sensor
Factors affecting the
measured value
The following factors can adversely affect the measurement quality:

The measuring gap is not sufficiently filled and flowed through by the
test sample
 Foreign bodies and air bubbles are in the measuring gap
 Extraordinary changes (interferences) of the sample matrix
 Contaminated measurement windows due to difficult waste water
matrix
 Damaged measuring windows
 Lacking quality of the zero adjustment, e. g. due to contaminated
ultrapure water
 The user calibration is not representative (or erroneous)
Raw value,
identifiable by #
Measured value