28
4.12.5 Readjustment with test gas
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.
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
3
you must
convert this value to
ppm
.
The formula required for conversion
is:
Calibrating-gas value x 0.737.
Example:
2179 mg/m
3
=
1606 ppm NO
Confirm your entry with
E
or by clicking
OK.
Best.- Nr.
Typ
Geräte - Nr.
FD U ( V )
P ( W ) F ( Hz )
Made in Germany
088
Best. Nr. 1687 022 768 FD xxx
AF 1
O
2
GF 3
GF 2
cal
459737/25Ha
NO
2
1
4
3
5
Содержание BEA 150
Страница 91: ...92 12 Overview 12 1 Electrical wiring Siemens analysis chamber 459716 2Ha ...
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Страница 96: ...97 12 6 Electrical wiring Andros analysis chamber 4597162Ht ...
Страница 99: ...100 12 9 Hosing Andros analysis chamber 459869_03Ht ...
Страница 100: ...101 12 10 Gas circuit diagram Andros analysis chamber ...