Measurement Operation; Calibration; Overview - wtw NiCaVis 705 IQ TS Operating Manual

NiCaVis 705 IQ TS
Measured value
display
Factors affecting the
measured values
ba77189e01 05/2017
4.2

Measurement operation

CAUTION
Never look into the measuring window or put objects into the
measuring 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.
Fig. 4-2
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 sample 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)
4.3

Calibration

4.3.1 Overview

In the delivery condition, the sensor is precalibrated and ready to measure (see
section 3.4.1).
There are two types of calibration that are included into the calculation of the
measured value at different points (see section 4.1):
 User calibration (see section 4.3.2)
Measurement / Operation
Raw value,
identifiable by #
Measured value
25