Dräger PIR 7000 Gebrauchsanweisung Seite 24
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Cross-Sensitivities Dräger PIR 7000 Type 334
The gas transmitter Dräger PIR 7000 Type 334 measures the concentration of many hydro-
carbons. It is not specific for the substances which are stored with their characteristics. Vari-
ous substance-specific sensitivities must be taken into account when specifying cross-
sensitivities.
As an example, typical values for some types of hydrocarbons are listed below.
Substance
CAS No. LEL
LEL
accord-
accord-
ing to
ing to
NIOSH
IEC
1)
[% vol.]
[% vol.]
acetone
67-64-1
2.5
2.5
benzene
71-43-2
1.2
1.2
i-butane
75-28-5
1.6
1.3
n-butane
106-97-8
1.6
1.4
n-butyl
123-86-4
1.7
1.3
acetate
cyclohexane 110-82-7
1.3
1.2
ethanol
64-17-5
3.3
3.1
ethyl acetate 141-78-6
2.0
2.2
MEC
78-93-3
1.4
1.8
n-octane
111-65-3
1.0
0.8
i-propyl
67-63-0
2.0
2.0
alcohol
toluene
108-88-3
1.1
1.1
o-xylene
95-47-6
0.9
1.0
1) The factors used to convert % vol. into % LEL are stated according to NIOSH for LEL category 1, according to IEC 60079-20 for LEL category 2 and according to
Brandes / Möller - Safety Characteristic Data, Volume 1: Flammable Liquids and Gases (ISBN 3-89701-745-8) for LEL category 3.
2) Based on LEL values according to IEC, typical tolerances: ±5 % LEL.
24
LEL
Recom-
LEL
Display for
accord-
mended
accord-
50 % LEL
ing to
category gas
ing to
in % LEL
PTB
IEC
of category
1)
1)
[% vol.]
[% vol.]
gas
2.5
ethylene
2.3
1.2
ethylene
2.3
1.5
propane
1.7
1.4
propane
1.7
1.2
propane
1.7
1.0
propane
1.7
3.1
propane
1.7
2.0
propane
1.7
1.5
propane
1.7
0.8
propane
1.7
2.0
propane
1.7
1.1
propane
1.7
1.0
ethylene
2.3
Cross-Sensitivities Dräger PIR 7000 Type 340
The gas transmitter Dräger PIR 7000 Type 340 measures the concentration of many hydro-
carbons. It is not specific for the substances which are stored with their characteristics. Vari-
ous substance-specific sensitivities must be taken into account when specifying cross-
sensitivities.
As an example, typical values for some types of hydrocarbons are listed below.
Substance
CAS No. LEL
accord-
ing to
NIOSH
2)
[% vol.]
72
acetone
67-64-1
78
i-butane
75-28-5
38
n-butane
106-97-8
38
n-butyl
123-86-4
acetate
31
cyclohexane
110-82-7
10
ethanol
64-17-5
68
ethyl acetate 141-78-6
54
MEC
78-93-3
32
n-octane
111-65-3
32
i-propyl
67-63-0
alcohol
45
toluene
108-88-3
34
o-xylene
95-47-6
78
LEL
LEL
Recom-
accord-
accord-
mended
ing to
ing to
category gas
IEC
PTB
1)
1)
1)
[% vol.]
[% vol.]
2.5
2.5
2.5
propane
1.6
1.3
1.5
propane
1.6
1.4
1.4
propane
1.7
1.3
1.2
propane
1.3
1.2
1.0
propane
3.3
3.1
3.1
propane
2.0
2.2
2.0
propane
1.4
1.8
1.5
propane
1.0
0.8
0.8
propane
2.0
2.0
2.0
propane
1.1
1.1
1.1
propane
0.9
1.0
1.0
propane
LEL
Display for
accord-
50 % LEL
ing to
in % LEL
IEC
of category
2)
[% vol.]
gas
1.7
11
1.7
57
1.7
57
1.7
30
1.7
50
1.7
64
1.7
23
1.7
22
1.7
59
1.7
42
1.7
10
1.7
15
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