59
7 Appendix
7.5.2
Electrochemical sensors (EC)
7.5.2.1 Oxygen O
2
Type:
Electrochemical sensor
Measuring range:
0 – 25 % vol.
Resolution:
0.1 % vol.
Measuring error:
±3 % / ±0.3 % vol. (±3 digits)
Response time:
t
90
< 15 s
Drift:
< 2 % within 3 months
Temperature range:
-20 ºC – +40 ºC
Interference:
None
Lifetime:
– Warranted
– Expected
2 years
3 years
Test gases:
– Zero point
– Sensitivity
100 % vol. CH
4
or 100 % vol. N
2
Fresh air (20.9 % vol.)
7.5.2.2 Carbon monoxide CO
Type:
Electrochemical sensor
Measuring range:
– Lower limit
0 – 500 ppm
4 ppm
Resolution:
1 ppm
Measuring error:
±3 % / ±3 ppm (±3 Digit)
±5 ppm (long-term stability) as per
Zero point deviation:
7 ppm
Response time:
t
90
< 30 s
Decay time:
t
10
< 24 s
Drift:
< 10 % within 6 months
Temperature range:
-20 ºC – +40 ºC
Interference at 20 ºC.
– 3000 ppm H
2
– 100 ppm NO
Approx. 1000 ppm CO
Approx. 25 ppm CO
Lifetime:
– Warranted
– Expected
24 months
36 months
Test gases:
– Zero point
– Sensitivity
Fresh air
40 ppm CO
