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Table 1 | |
Classes and measuring ranges | |
---|---|
Parameter | Classes 0 and I |
CO fraction | from 0 to 5 % vol |
CO2 fraction | from 0 to 16 % vol |
HC fraction | from 0 to 2 000 ppm vol |
O2 fraction | from 0 to 21 % vol |
λ | from 0,8 to 1,2 |
For the climatic and mechanical influence quantities:
a minimum temperature range of 35 °C for the climatic environment;
the mechanical environment class that applies is M1.
For the electrical power influence quantities:
the voltage and frequency range for the AC voltage supply;
the limits of the DC voltage supply.
For the ambient pressure:
the minimum and the maximum values of the ambient pressure are for both classes: pmin ≤ 860 hPa, pmax ≥ 1 060 hPa.
For each of the fractions measured, the maximum error value permitted under rated operating conditions according to point 1.1 of Annex I is the greater of the two values shown in Table 2. Absolute values are expressed in % vol or ppm vol, percentage values are percent of the true value.
Table 2 | ||
MPEs | ||
---|---|---|
Parameter | Class 0 | Class I |
CO fraction | ± 0,03 % vol ± 5 % | ± 0,06 % vol ± 5 % |
CO2 fraction | ± 0,5 % vol ±5 % | ± 0,5 % vol ± 5 % |
HC fraction | ± 10 ppm vol ± 5 % | ± 12 ppm vol ± 5 % |
O2 fraction | ± 0,1 % vol ± 5 % | ± 0,1 % vol ± 5 % |
The MPE on lambda calculation is 0,3 %. The conventional true value is calculated according to the formula set out in point 5.3.7.3 of Regulation No 83 of the Economic Commission for Europe of the United Nations (UN/ECE)(1).
For this purpose, the values displayed by the instrument are used for calculation.
either the change in the measurement result is not greater than the critical change value laid down in point 4;
or the presentation of the measurement result is such that it cannot be taken for a valid result.
Table 3 | ||||
a 0,01 % vol for measurand values below or equal to 4 % vol, otherwise 0,1 % vol. | ||||
Resolution | ||||
---|---|---|---|---|
CO | CO2 | O2 | HC | |
Class 0 and class I | 0,01 % vol | 0,1 % vol | a | 1 ppm vol |
The lambda value shall be displayed with a resolution of 0,001.
6 % vol CO,
16 % vol CO2,
10 % vol O2,
5 % vol H2,
0,3 % vol NO,
2 000 ppm vol HC (as n-hexane),
water vapor up to saturation.