86
│ 9 Appendix
9.2.2
Semiconductor sensor
Methane CH
4
, propane C
3
H
8
(Structure application)
Type
gas-sensitive semiconductor (SC)
Use
PM 580
Measuring range
0 – 4500 ppm
Resolution
1/2/20/200 ppm
Response times
– CH
4
:
100 ppm:
t
50
< 7 s
t
90
< 10 s
1,000 ppm: t
50
< 5 s
t
90
< 8 s
– C
3
H
8
:
3,000 ppm: t
50
< 8 s
t
90
< 11 s
When using the
SPE AutoFlow
: The response
times can be extended by up to 4 s as additional
volume must be passed through (test gas hose,
conditioner).
Warm-up time
< 120 s
Temperature range
-20 – 40 ºC
Measuring error
For measurement values > 100 ppm under the
same ambient conditions:
– CH
4
:
±20 % of the measured value
– C
3
H
8
:
±20 % of the measured value
Interference
– all hydrocarbons
– H
2
– Water vapour
Lifetime
12 months (60 months expected)
Test gases
Use the conditioner for all test gases!
– zero point: clean air
– CH
4
:
1,000 ppm in synth. air
– C
3
H
8
:
0.3 % vol. in synth. air
setting ranges:
– CH
4
:
100 – 10,000 ppm
– C
3
H
8
:
100 – 10,000 ppm
