YSI NiCaVis 701 IQ NI User Manual
Page 28
Measuring / Operation
NiCaVis 70x IQ NI
4 - 4
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03/2013
Sensor check (H2O dest.)
The characteristics of a sensor and thus the measured values provided
by it change in the course of time.
The reasons for this can be the aging of the sensor, or contamination
or mechanical damage of the sensor. Contamination or mechanical
damage in the area of the measuring chamber or on the measurement
windows affect the measured values.
In UVspectroscopy, very small contamination that is not visible to the
eye can considerably affect the measured value.
The proper and thorough cleaning of the sensor is the basis for reliable
measurement data.
A
Sensor check (H2O dest.)
determines the condition of the UV sensor.
By checking the sensor with the aid of the
Sensor check (H2O dest.)
you can rapidly see any changes of the sensor and whether it needs to
be cleaned or if any other actions have to be taken.
A
Sensor check (H2O dest.)
should be carried out twice per year at
regular intervals. An extraordinary
Sensor check (H2O dest.)
should be
carried out if you suspect that the sensor has been damaged such as
by mechanical shock, or if the measured values do not seem plausible.
Zero adjustment
While the
Sensor check (H2O dest.)
just determines the current state
of the sensor, a
Zero adjustment
can be used to compensate for
changes of the sensor. A zero adjustment can be required if, for
example, the
Sensor check (H2O dest.)
is not successful even after the
sensor was thoroughly cleaned.
The sensor should always be very thoroughly cleaned prior to a zero
adjustment.
If the
Zero adjustment
is not successful, the sensor is blocked for mea-
surement. A successful
Zero adjustment
is required for the determina-
tion of measured values.
Sensor check (standard)
Use the
Sensor check (standard)
to check the sensor with a standard
solution (see chapter 6 S
). During the check, the recorded spectrum is compared to a
reference spectrum of the standard solution stored in the sensor.