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Doc430/2789CV01H 57
8.6 Ionisatiemeting
Voor het uitvoeren van een ionisatiemeting dient een micro-ampèremeter, met een meetbereik
van 0 - 200 µA DC, in het ionisatiecircuit te worden opgenomen. Op deze wijze kan de ionisatiebe-
veiliging worden gecontroleerd. De nominale ionisatiestroom bedraagt 6 tot 25 µA. De minimale
ionisatie stroom bedraagt 2,8 µA.
8.7 Service
Voor het verlenen van service en onderhoud is de servicedienst van uw Rendamax leverancier
steeds beschikbaar.
9 Omrekeningsformules en -factoren
Omrekeningsformules
CO
gemeten O
2
2
20 9
11 7=
×
,
,
20,9
O
2
20 9
20 9
11 7
=−
×
,
,
,
gemeten CO
2
11,7 % CO
2
is het maximale CO
2
-percentage dat ontstaat bij het stoichiometrisch verbranden van
Gronings aardgas.
Luchtovermaat N:
N =
×
20 9
9
0 914
,
,
20, gemeten O
2
of
N
gemeten
=+
×1
11 7
1 0 914
,
,
CO
2
Omrekeningsfactoren
Voor NO
x
(N=1):
1 ppm = 2,05 mg/m3 = 1,759 mg/kWh = 0,498 mg/MJ
Voor CO (N=1):
1 ppm = 1,24 mg/m3 = 1,064 mg/kWh = 0,298 mg/MJ
Voorbeeld
Meetwaarden van een milieuvriendelijke unit:
NO
x
= 15 ppm
CO
2
= 10 %
Wat is de NO
x
-waarde volgens de meest gebruikte norm in mg/kWh bij N=1?
O
2
20 9
10 20 9
11 7
3=−
×
=,
,
,
%
N =
=
20 9
20 9 3
117
,
,
,
NO
x
(bij N = 1 ) =
15,0 x 1,17 = 17,6 ppm
17,6 x 1,759 = 30,9 mg/kWh
63


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