9023744 - 3rd edition - October 2005
Page 27 of 40
Technical Data
Measuring other gases and vapours
The transmitter Polytron Ex (83 17 517) with Ex-sensor PR M (68 09 225) has been tested for suitability for detecting the
following gases and vapours in accordance with standards EN 50 054 and EN 50 057:
Notes on Table
Gas or vapour Chemical symbol LEL
in % V/V
Linearity error
up to 70 % LEL
in % LEL
Test gas
concentration
Propane
in % V/V
Display when
propane is
applied
1)
in % LEL
1)
These figures apply to new-value sensors. Dispersion and in particular changes in the sensor due to age can lead to deviations in the values
displayed.
Acetone CH
3
COCH
3
2.2 ≤ 3 0.99 65 … 69
Acetylene C
2
H
2
1.5 ≤ 4 0.49 50 … 65
2)
Ammonia NH
3
15.0 ≤ 6 0.51 19 … 24
2)
2)
Test gases with approx. 50 % LEL of the respective substance are available for these substances. In principle, adjustment using a specific test gas will
rule out a measuring error due to sensor sensitivity dispersion.
Gasoline 065/095 HC mixture 1.1 ≤ 4 0.51 40 … 45
Benzene C
6
H
6
1.2 ≤ 3 0.51 40 … 61
1,3-butadiene CH
2
=CH–CH=CH
2
1.4 ≤ 11 0.51 37 … 51
2-butanone (MEK) CH
3
COC
2
H
5
1.8 ≤ 4 0.51 39 … 42
n-butane C
4
H
10
1.5 ≤ 3
2)
n-butyl acetate CH
3
COOC
4
H
10
1.2 ≤ 4 0.51 50 … 55
Cyclopropane C
3
H
6
2.4 ≤ 5 0.99 44 … 55
Diethylether C
2
H
5
OC
2
H
5
1.7 ≤ 3 0.51 37 … 43
Dimethylether CH
3
OCH
3
3.0 ≤ 4
2)
Ethanol C
2
H
5
OH 3.3 ≤ 4 0.99 51 … 55
Ethene (ethylene) C
2
H
4
2.7 ≤ 5
2)
Ethyl acetate CH
3
COOC
2
H
5
2.1 ≤ 4 0.99 67 … 72
Ethylene oxide C
2
H
4
O 2.6 ≤ 3 0.51 36 … 41
2)
n-hexane C
6
H
14
1.2 ≤ 4 0.99 67 … 76
Methane CH
4
5.0 ≤ 3
2)
Methanol CH
3
OH 5.5 ≤ 4 0.99 49 … 53
n-nonane C
9
H
20
0.7 ≤ 3
3)
3)
Up to 60 % LEL. The calibration curve could only be plotted up to 60 % LEL due to the low vapour pressure of the substance.
0.51 57 … 58
n-octane C
8
H
18
0.8 ≤ 4 0.51 51 … 60
n-pentane C
5
H
12
1.4 ≤ 3 1.05 67 … 68
i-propanol (CH
3
)
2
CHOH 2.0 ≤ 4 0.51 37 … 40
Propane C
3
H
8
2.0 ≤ 4
2)
Propylene oxide C
3
H
6
O 1.9 ≤ 6 0.49 41 … 44
Propene (propylene) C
3
H
6
2.0 ≤ 4 0.51 30 … 44
2)
Toluene C
6
H
5
CH
3
1.2 ≤ 3 0.51 38 … 57
Hydrogen H
2
4.0 ≤ 6
4)
4)
Up to 50 % LEL: ≤ 2 % LEL
2)
Column 3: The lower explosion limits (LEL) shown were mostly taken from Annex A to EN 50054:1998. Different lower
explosion limits may apply when setting up the devices at the place of use.
Column 4: In the case of the Polytron Ex calibrated to the substance shown (in column 1), the display in the 0 to 70 % LEL
range varies from the actual concentration of the substance by not more than the value indicated here.
Column 5: Concentration of the reference gas (propane) in air
Column 6: Application of propane at the concentration shown (in column 5) leads to the display indicated here for the
Polytron Ex transmitter calibrated to the substance shown (in column 1).
Example: Polytron Ex, calibrated to benzene, display when 0.51 % by vol. propane is applied: 40 to 61 % LEL.
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