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Technical Data
Cross-Sensitivities Dräger PIR 7000 Type 334
The gas transmitter Dräger PIR 7000 Type 334 measures the concentration of many
hydrocarbons. It is not specific for the substances which are listed in the gas library with their
individual characteristics. Various 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.
1) The conversion factors of %LEL to % vol. are indicated according to NIOSH for category 1, according to IEC 60079-20 for category
2, and according to Nabert / Schön (safety characteristics of flammable gases and vapours) for category 3.
2) Based on LEL values acc. to IEC, typical tolerance: ±5 %LEL.
Substance CAS no.
LEL
accor-
ding to
NIOSH
[% vol.]
1)
LEL
accor-
ding to
IEC
[% vol.]
1)
LEL
accor-
ding to
PTB
[% vol.]
1)
Recommended
category gas
LEL
accor-
ding to
IEC
[% vol.]
Reading for
50 %LEL
in %LEL
of category
gas
2)
Acetone 67-64-1 2.5 2.5 2.5 Ethylene 2.3 72
Benzene 71-43-2 1.2 1.2 1.2 Ethylene 2.3 78
i-Butane 75-28-5 1.6 1.3 1.5 Propane 1.7 38
n-Butane 106-97-8 1.6 1.4 1.4 Propane 1.7 38
n-Butyl acetate 123-86-4 1.7 1.3 1.2 Propane 1.7 31
Cyclohexane 110-82-7 1.3 1.2 1 Propane 1.7 10
Ethanol 64-17-5 3.3 3.1 3.1 Propane 1.7 68
Ethyl acetate 141-78-6 2 2.2 2 Propane 1.7 54
Methyl ethyl ketone 78-93-3 1.4 1.8 1.5 Propane 1.7 32
n-Octane 111-65-3 1 0.8 0.8 Propane 1.7 32
i-Propyl alcohol 67-63-0 2 2 2 Propane 1.7 45
o-Xylene 95-47-6 0.9 1 1 Ethylene 2.3 78
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