sewerin EX-TEC PM 4 - Sensors

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 ammable 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