Lel, And Lel Correlation Factors For Combustible Gases - Industrial Scientific Ventis MX4 Product Manual

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Ventis™ MX4 Product Manual

LEL, and LEL Correlation Factors for Combustible Gases

Sample gas*

LEL

(% vol)

Acetone

2.5%

Acetylene

2.5%

Benzene

1.2%

Butane

1.9%

Ethane

3.0%

Ethanol

3.3%

Ethylene

2.7%

Hexane

1.1%

Hydrogen

4.0%

Isopropanol

2.0%

Methane

5.0%

Methanol

6.0%

Nonane

0.8%

Pentane

1.4%

Propane

2.1%

Styrene

0.9%

Toluene

1.1%

Xylene

1.1%

JP-4

—

JP-5

—

JP-8

—

NOTE: The table above provides the LEL for select combustible gases*. It also provides correlation factors that help the safety

technician and instrument operator determine the actual percentage LEL when the sample gas differs from the gas that was used to

calibrate the unit.

For example, if the unit reads 10% LEL in a pentane atmosphere, and was calibrated to methane, the actual percentage LEL is

determined as follows:

Locate the table cell where the sample gas (pentane) intersects with the calibration gas (methane).

Multiply the cell's value (2.02) by the unit's LEL reading (10%) to calculate the actual concentration of 20.2% LEL.

* The combustible gas list is not a comprehensive list of all combustible gases that can be detected by the Ventis MX4. For

additional information about combustible gas detection and the Ventis MX4, contact the ISC Technical Service department.

Butane

Hexane

Hydrogen

1.00

0.70

0.60

1.10

0.80

1.00

0.58

0.80

0.60

0.89

0.52

0.80

0.60

1.71

1.00

0.56

0.33

1.10

0.90

0.60

0.35

0.60

0.50

2.22

1.30

1.21

0.71

0.97

0.57

1.30

1.00

1.53

0.89

1.50

1.10

—

LEL correlation factors

Calibration gas

Methane

Pentane

1.70

1.30

1.90

1.78

1.67

1.30

1.59

1.49

1.40

1.30

3.04

2.86

1.00

0.94

2.00

1.90

1.06

1.00

1.10

3.95

3.71

2.15

2.02

1.72

1.62

2.20

2.71

2.55

2.60

2.50

—

Propane

0.90

1.10

0.70

0.80

1.00

1.20

0.83

1.03

0.70

0.80

0.74

0.92

0.70

0.90

1.42

1.77

0.47

0.58

1.00

1.20

0.50

0.62

0.60

0.70

1.84

2.29

1.00

1.25

0.80

1.00

1.10

1.40

1.26

1.57

1.30

1.60

1.20

—

0.90

—

1.50

—

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Lel, And Lel Correlation Factors For Combustible Gases - Industrial Scientific Ventis MX4 Product Manual

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