Calculation with k and k1 (Siegert):
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
×
−
=
1
2
)
(
k
CO
k
TA
TG
q
A
q
A
Exhaust gas losses as a %
TG Exhaust gas temperature in °C
TA Fresh air temperature in the immediate vicinity of burner air intake in °C
CO
2
CO
2
content of dry exhaust gases as a % vol.
k, k
1
Characteristics according to fuel type (k
1
= 0).
11.1.3
Evaluation of measurements q
A
-F
Exhaust gas losses are calculated to 1 place after the decimal point and recorded in that way in the
measurement report (see "Calculation of exhaust gas losses q
A
").
For the purposes of comparison with the limit value, the measurement inaccuracies (F values) are taken
into consideration as per Table 2.
Measurement inaccuracies with a measurement computer maintained according to regulations for the
measurement of exhaust gas losses.
Measured oxygen content Measurement inaccuracy (F value)
Up to 13.0% vol O
2
± 0.5% Exhaust gas losses
13.1 – 16.0% vol O
2
± 1.0% Exhaust gas losses
Over 16.0% vol O
2
± 2.0% Exhaust gas losses
11.1.4
Margins of error
The margins of error for measuring instruments for the determination of the content of O
2
, CO
2
, CO and
NO
x
are specified as follows in the measurement ranges important for the LRV [Swiss Decree on Air Purity],
according to metas instructions dated January 2004:
O
2
±
0.4 % vol. in entire range
CO
2
±
0.07 x display or
±
0.35 % vol. (whichever is greater)
CO
±
0.10 x display or
±
12 ppm (whichever is greater)
NO
x
±
0.10 x display or
±
10 ppm (whichever is greater)
NO
2
±
7 ppm in entire range
11.2
Alternative designs
Abbreviations Description
S1
Probe length 160 mm
C CO
protection
CC
Chip card for data storage
Example of description:
EU-50/S1/C/CC
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