64
7 Technical data
z
Response times of
EX-TEC
PM
4
(diffusion device without probe)
– LEL range:
t
50
< 8 s
for methane (CH
4
)
t
50
< 17 s
for propane (C
3
H
8
)
t
90
< 36 s for methane (CH
4
)
t
90
< 74 s
for propane (C
3
H
8
)
t
90
< 3 min for nonane (C
9
H
20
)
z
Warm-up time
– ppm range:
Approx. 1 min
– LEL range:
≤ 22 s
– % vol. range:
≤ 22 s
7.4
Sensors
z
Lifetime
Catalytic combustion sensor (CC)
– Warranted:
1 year
– Expected:
5 years
Semiconductor sensor (SC)
– Warranted:
1 year
– Expected:
5 years
Thermal conductivity sensor (TC)
– Warranted:
1 year
– Expected:
5 years
z
Interference
– ppm / % LEL range:
All flammable gases
– % vol. range:
All gases with a different thermal
conductivity than air
z
Measuring error
–
ppm range
±30 %
– % LEL range
±2 % LEL (short-term stability)
±4 % LEL (long-term stability)
acc. to EN 60079-29-1
– % vol. range
±5 % vol.
acc. to EN 60079-29-1
