9 Appendix
│
83
9.2
Sensors
Note:
When using probes, the specified response times are extended.
9.2.1
Infrared sensors
Methane CH
4
, propane C
3
H
8
(Warning application)
Type
infrared sensor (IR)
Use
PM 580/550/500
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.)
Resolution
– CH
4
:
1 % LEL or 0.05 % vol.
– C
3
H
8
:
1 % LEL or 0.02 % vol.
Response times
– CH
4
: t
50
< 13 s
t
90
< 25 s
– C
3
H
8
: t
50
< 15 s
t
90
< 28 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 % UEG (long-term stability)
– C
3
H
8
:
±1 % LEL (short-term stability)
±2 % UEG (long-term stability)
Interference
all hydrocarbons
Humidity
5 – 95 % r.h., non-condensing
short term:
0 % r.h.
Lifetime
24 months (60 months expected)
Test gases
– zero point: clean air
– CH
4
:
2.20 % vol.
– C
3
H
8
:
1.00 % vol.
Humidity gas/test gas 5 – 95 % r.h., non-condensing
short-term:
0 % r.h.
error:
±9 % of the EMR
Pressure
700 – 1200 hPa
error:
±2 % of the EMR
