wtw TresCon NOx-N, Operating Manual

Page: 38 / 112

Operation NOx-N
2 - 18 ba43110e05 01/2011
Resolution of the
display
The resolution of the display depends on:
z
Size of the measured value
z
Dimension
z
Citation form
z
Dilution
Note
A list of the resolution for all measuring ranges, citation forms and units
can be found in chapter 5 T
ECHNICAL DATA
.
2.9 Displaying/changing the attenuation parameters
You can set the attenuation of the measured value calculation in four
steps in this menu.
How it functions The measured values are acted upon mathematically by a digital
lowpass filter and the measured value that is output to the central unit
is thus damped.
The calculation of the new values is performed at intervals of 20 s. At
intervals of the measurement (5, 10, 15 min., etc. depending on the
setting), a new x value is used for the lowpass filter calculation.
If the analyzer begins a new measuring cycle (after STOP or AutoCal),
firstly, all the x
n
are set to the newly calculated concentration values.
This prevents the filter from oscillating and the new measured value is
displayed immediately.
The digital attenuation results in an extremely smooth response of any
successive control unit.
You can display or change the current setting in this menu. Each step
corresponds to a fixed rise time (data in parentheses).
Parameter Values
Step off,
1 (= 100 s),
2 (= 200 s),
3 (= 300 s),
4 (= 400 s)
Inputs