sewerin VARIOTEC 480 EX - Sensors; Gas-Sensitive Semiconductor (SC)

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7 Appendix
7.5 Sensors
Note:
Probes increase the stated response times.
7.5.1 Gas-sensitive semiconductor (SC)
Methane CH
4
, propane C
3
H
8
Type: Gas-sensitive semiconductor
Measuring range: 0 – 1 % vol.
Resolution: 1 ppm / 2 ppm / 20 ppm / 200 ppm
Measuring error: ±30 %
Alarm thresholds
(as delivered):
3 ppm
Interference at 20 ºC. All hydrocarbons C
x
H
y
Lifetime:
– Warranted
– Expected
1 year
5 years
Test gases:
– Zero point
– Sensitivity
Fresh air
10 ppm / 100 ppm / 1000 ppm / 1.0 % vol.