9 Appendix
│
87
9.2.3
Catalytic combustion sensor
Methane CH
4
, propane C
3
H
8
, nonane C
9
H
20
, acetylene C
2
H
2
,
hydrogen H
2
, JFuel (kerosine)
Type
catalytic combustion sensor (CC)
Use
PM 400
Measuring range
0 – 100% LEL
– CH
4
:
0 – 4.40 % vol.
(adjustable 4.00 – 5.00 % vol.)
– C
3
H
8
:
0 – 1.70 % vol.
(adjustable 1.50 – 2.10 % vol.)
– C
9
H
20
:
0 – 0.70 % vol.
– C
2
H
2
:
0 – 2.30 % vol.
– H
2
:
0 – 4.00 % vol.
– JFuel:
0 – 0.70 % vol.
Resolution
– CH
4
:
1 % LEL or 0.05 % vol.
– C
3
H
8
:
1 % LEL or 0.02 % vol.
– C
9
H
20
:
2 % LEL or 0.02 % vol.
– C
2
H
2
:
2 % LEL or 0.05 % vol.
– H
2
:
1 % LEL or 0.05 % vol.
– JFuel:
2 % LEL or 0.02 % vol.
Response times
– CH
4
: t
50
< 7 s
t
90
< 13 s
– C
3
H
8
: t
50
< 7 s
t
90
< 13 s
– C
9
H
20
: t
50
< 23 s
t
90
< 3 min
– C
2
H
2
: t
50
< 6 s
t
90
< 10 s
– H
2
: t
50
< 6 s
t
90
< 11 s
– JFuel: t
50
< 15 s
t
90
< 60 s
Warm-up time
< 120 s
Temperature range
-20 – 40 ºC
Measuring error
to EN 60079-29-1
– CH
4
:
±1 % LEL (short-term stability)
±2 % LEL (long-term stability)
– C
3
H
8
:
±2 % LEL (short-term stability)
±2 % LEL (long-term stability)
– C
9
H
20
:
±2 % LEL (short-term stability)
±8 % LEL (long-term stability)
– C
2
H
2
:
±1 % LEL (short-term stability)
±4 % LEL (long-term stability)
– H
2
:
±1 % LEL (short-term stability)
±2 % LEL (long-term stability)
– JFuel:
±2 % LEL (short-term stability)
±8 % LEL (long-term stability)
When using a substitute test gas:
– C
9
H
20
:
±30 % of the measured value
– JFuel:
±30 % of the measured value
