GAS/VAPOR
RELATIVE SPAN
Acetone
50
Allyl Alcohol
50
Benzene
44
Butane
51
Butan-2-one (MEK)
48
Butyl Acetate
36
Cyclohexane
44
Di n-butyl ether
43
Ethane
82
Ethanol
64
Ethene
81
Ethyl Acetate
46
Ethyl Benzene
30
Ethylene Oxide
64
Hexane
46
Heptane
44
Hydrogen
107
GAS/VAPOR
RELATIVE SPAN
Methane
100
Methanol
84
Methylamine
80
Methylethylketone
48
Methyl,t-butylether
44
n-Propanol
50
Octane
38
Pentane
50
Propane
63
Propan-2-ol (IPA)
49
Propylene
64
Propylene Oxide
46
Styrene
32
Tetrahydrofuran
64
Toluene
44
t-Butylalcohol
74
Xylene
31
56
57
APPENDIX A.
SPECIFICATIONS
NITROGEN DIOXIDE
GAS
CONCENTRATION (PPM)
TYPICAL RESPONSE (PPM)
Hydrogen Sulfide
10
no data
Sulfur Dioxide
50
0
Hydrochloric Acid
5
0
Phosphine
0.1
0
Carbon Monoxide
1000
0
Carbon Dioxide
5000
0
Nitrogen
1,000,000
0
Chlorine
1
3
Hydrogen
1000
0
Hydrocarbons
10,000
0
Ammonia
30
0
Ozone
1
0.7
Diborane
0.1
0
Arsine
0.1
0
Germane
1
0
Fluorine
3
0
Alcohols
1000
0
Nitrogen Monoxide
100
0
COMBO-TOX (CO/H
2
S)
GAS
CONCENTRATION (PPM)
TYPICAL RESPONSE(PPM)
Hydrogen Sulfide
15
38
Sulfur Dioxide
5
2.5
Nitric Oxide
35
10
Nitrogen Dioxide
5
Neg3
Chlorine
1
<Neg1
Hydrogen
100
<40
APPENDIX A.
SPECIFICATIONS
LEL CROSS SENSITIVITY DATA
Note: This section below should be disregarded if you have chosen the “LEL GAS TYPE” in the
supervisory mode).
The cross sensitivity data above contains the relative span for a number of combustible gases.
This information enables the following cross sensitivity calculations:
(1) Instrument reading in LEL when exposed to a specific combustible gas included in the table:
Instrument reading in LEL = LEL concentation of gas applied x relative span of gas applied
---------------------------------------------------------------------------
relative span of calibration gas
Example 1: What will an instrument, calibrated to methane, read when exposed to 10% toluene?
Calculation: 10 x 44 = 4.4%LEL toluene
------------
100
M U L T I G A S D E T E C T I O N