PBI-300042-B 10/2010 COPYRIGHT © PBI-Dansensor A/S
20 User Guide EN CheckMate 3
Correction for CO
2
cross-sensitivity
NOTE! Only valid for devices with an Electro-chemical (EC) O
2
sensor and without
CO
2
sensor.
Due to the Electro-chemical (EC) O
2
sensor’s cross-sensitivity to CO
2
, you must manually
compensate for the read-out value using the appropriate correction factor from the table
below to obtain a more accurate result.
Example:
• Measurement performed in:
80% CO
2
• Display read-out value is:
1.2% O
2
• Correction factor according to table is:
0.16 (marked in table).
• “True” value is:
1.2 - 0.16 = 1.04% O
2
NOTE! For values in-between table values you will have to interpolate.
NOTE! Read-out values will always lie within specifications (see "Technical
specifications" on page 49) but using manual compensation will ensure more
accurate results.
"True" O value = Read-out value - correction
2
CO
2
10%
0000.000.000.070.100.100.100.100.100.10
00 004 009 013 016 018 019 019 020 020
00 000 007 007 013 013 021 023 027 027
0 0 0 00 0 11 0 11 0 11 0 11 0 16 0 16 0 20 0 20
0150150150.210,270,27
0000
0.18 0.18 0.33 0.33
0.11 0.11 0.30 0.30
0.00 0.24 0.24
0.00 0.14 0.14
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.2 % .
0.4 % .
0.8 % .
1.2 % .
1.6 %
2.0 %
2.4 %
2.8 %
3.2 %
3.6 %
4.0 %
0.........
0.........
0.........
0.00 0.00 0.00 0.00 . . .
0.00 0.00 0.00 0.00 0.00 0.00 .18 .26 .33 .33
0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00
20% 30% 40% 50% 60% 70% 80% 90% 95%
O
2
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