2 Product description
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9
2.3
Features
2.3.1
Sensors
The sensors included as device features depend on the product
variant. The following sensors are included as standard or as
options:
Sensor Gas/gas type
PM 580 PM 550 PM 500 PM 400
IR
CH
4
C
3
H
8
×
×
×
–
CO
2
o
o
o
o
SC
CH
4
C
3
H
8
×
–
–
–
CC
CH
4
C
3
H
8
C
9
H
20
C
2
H
2
H
2
JFuel
–
–
–
×
EC
CO
o
o
o
o
O
2
o
o
o
o
H
2
S
o
o
o
–
× as standard, o optional, – not possible
When charging, the device shows which optional sensors are
included (Fig. 46).
Operating principles of the sensors
Sensor
Operating principle
IR Infrared sensor
absorption by infra-red-active
gases
SC Gas-sensitive
semiconductor
reacts to changes in conductivity
brought about by reducible gases
CC Catalytic combustion
sensor
catalytic combustion
EC Electrochemical
sensor
electrochemical cell
