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4.12.5 Readjustment with test gas
28
i To calibrate the NO measuring sensor you will require a calibrating gas with the
following composition:
From 1000 to 5000 ppm NO in nitrogen (N).
The electrochemical measuring sensor must be recalibrated at regular intervals. Only in
this way can measuring accuracy be reliably maintained. The recalibration process also
allows faulty NO measuring sensors to be detected.
Before commencing recalibration, connect the calibrating-gas bottle as shown in the
illustration below. Connect the calibrating-gas connection to the test-gas inlet.
Best.- Nr.
Typ
Geräte - Nr.
FD
U ( V )
P ( W )
F ( Hz )
Made in Germany
088
1
Calibrating-gas bottle
2
Flow meter (rotameter)
3
Shutoff valve
4
Tee
5
Test-gas inlet
Start recalibration with E or by double-
clicking the mouse.
Using the keyboard, enter the calibrating-
gas value in ppm NO.
i If the calibrating-gas value is stated
on the certificate in mg/m
convert this value to ppm.
The formula required for conversion
is:
Calibrating-gas value x 0.737.
Example:
3
2179 mg/m
= 1606 ppm NO
Confirm your entry with E or by clicking
OK.
Best. Nr. 1687 022 768
FD xxx
GF 3
GF 2
AF 1
O
2
cal
459737/25Ha
5
3
you must
2
3
1
4
NO
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