wtw TresCon NOx-N, Operating Manual

Page: 83 / 112

NOx-N Maintenance
3 - 35 ba43110e05 01/2011
3.10 Triggering a multi-point calibration
The TresCon NOx-N performs a zero-point calibration at regular
intervals (see section 2.5 D
ISPLAYING
/
CHANGING THE
A
UTO
C
AL
PARAMETERS
on page 2-8). In addition, you can perform a multi-point
calibration with 4 calibration standards. To do so, you have to connect
the respective standards to the dist. H2O supply after being prompted.
During calibration, the consumables are pumped back out of the
system via the sample tube.
Caution
Only perform this service using the recommended WTW standards! We
recommend that you only allow the manual calibration to be performed
by the WTW service department (maintenance contract).
Step Instrument status/action
1 Rinsing cleaning solution
2 Flushing back sample
3 Rinsing cleaning solution
4 Rinsing dist. H2O
5 Rinse sample
6 Rinsing dist. H2O
7 Flushing back sample
8 Rinsing dist. H2O
9 Measuring the absorbance of dist. H2O
The following steps are performed for each calibration standard:
Follow the instructions on the display when changing the standard
solutions.
10 Rinsing standard X
11 Flushing back sample
12 Rinsing standard X
13 Measurement E
X
Program operating
sequence