wtw TresCon NOx-N, Operating Manual

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NOx-N Operation
2 - 13 ba43110e05 01/2011
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After the measuring procedure is completed call up the Parameter
Manual correction menu. Leave the TresCon in this mode until
Cnom is input so that the determined measured value is not
overwritten by following measured values (sampling at the same
time).
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Perform a comparison measurement (determine Cnominal), e. g.
using a laboratory photometer according to the following process
instructions.
Caution
Do not remove any particles! Perform a counter measurement
immediately after taking the sample! NOx must be determined!
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Enter Cnominal in the Parameter Manual correction menu of the
TresCon NOx-N.
Process instructions for
the comparison
measurement
(determination of
Cnominal)
Proceed as follows to determined Cnominal:
Input Cnominal You have determined the value, Cnominal, from the NOx counter
measurement according to the regulatory process standard.
1 Use a WTW test (e.g. model 14764) for the comparison
measurement.
2 Measure the sample with the photometer: Perform at least 5
tests according to the operating manual of the photometer.
3 Calculate the average value from the tests:
Cnom
Sum of measured values
Number of measured values
( )
-------------------------------------------------------------------------------- =
Parameter Values
Manual correction On, Off
Cnominal Concentration (mg/l), input digit-by-
digit within the limits
Cmin Display of the limits for the input of
Cnom (the values take into account
the background color present)
Cmax
h factor Display of the correction factor, h
1 Measuring mode
Select TresCon NO
X
-N with
68
.