wtw TresCon NOx-N, Operating Manual

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Overview NOx-N
1 - 2 ba43110e05 01/2011
1.1 Function
The TresCon NOx-N analyzing module operates according to the
photometric UV absorption procedure. This is used to detect nitrate
(NO
3
-
). As this measuring method cannot differentiate between nitrate
and nitrite ions (NO
2
-
), a cumulative value (NOx-N) is calculated if any
nitrate is present. A 4-beam photometer is used. It grants the highest
stability and absolute accuracy. A WTW background correction
procedure ensures high accuracy - even in highly colored samples.
Measurement is performed without any additional reagents.
The following points describe the fundamental features of the TresCon
NOx-N:
z
AutoCal
TresCon NOx-N performs an automatic zero-point calibration
(AutoCal) so that the instrument can always maintain its high degree
of absolute accuracy.
z
AutoClean
The TresCon NOx-N can clean the entire analyzer system itself so
that the user only has to perform a minimum amount of
maintenance.
z
AutoFlow
The TresCon NOx-N can monitor the entire analyzer system itself so
it can measure fluid levels and provide early warnings and
instructions to the operator to replace specific chemicals.
z
AutoAdapt
The TresCon NOx-N optimizes its measuring interval according to
the current change in the measured value. As a result, reagent
consumption is reduced to a minimum.
z
AutoTherm
The TresCon NOx-N automatically checks and regulates the
temperature of the measuring block. This ensures that the
instrument always functions safely.
z
Interfaces
The TresCon NOx-N is equipped with all the digital and analog
interfaces required by the industry. Thus, a standard connection is
possible to digital interfaces (RS232 and RS485), analog interfaces
(0/4-20 mA) and PLC interfaces (12 relay contacts).
Note
Please read chapters 2 S
AFETY
and 5 O
PERATION
in volume 1,
T
ERMINAL
, of this operating manual. It contains basic instructions.