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52 Doc890/3456CV02B
8.5 Cleaning the fi lter/screen in the gas combination block
Not applicable
8.6 Ionisation measurement
In order to carry out an ionisation measurement, a micro-am meter with a measuring range of
0 - 200 µA DC must be con nected in the ionisation circuit. In this way the ionisation protec tion
function can be checked. The nominal ionisation current is between 6 and 25 µA. The minimum
ionisation current is 2.8 µA.
8.7 Service
For service and maintenance the service department of your supplier is always available.
9 Conversion formulae and factors
Formulae
CO
measured O
2
2
20 9
11 7=
×
.
.
20.9
O
2
20 9
20 9
11 7
=−
×
.
.
.
measured CO
2
11.7% CO
2
is the maximum CO
2
percentage that is generated by stoichiometric burning of G20
natural gas (H-gas).
Excess air N:
N
easured
=
×
20 9
9
0 914
.
.
20. m O
2
or
N
m
=+
×1
11 7
1 0 914
.
.
CO easured
2
Conversion factors
For NO
x
(N=1):
1 ppm = 2.05 mg/m
3
= 1.759 mg/kWh = 0.498 mg/MJ
For CO (N=1):
1 ppm = 1.24 mg/m
3
= 1.064 mg/kWh = 0.298 mg/MJ
Example:
Measured values for an environmentally friendly unit:
NO
x
= 15 ppm
CO
2
= 10 %
What is the value for NO
x
according to the most usual standard in mg/kWh for N=1?
O
2
20 9
10 20 9
11 7
3=−
×
=.
.
.
%
49


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