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LEL Correlation Factors: Battery & Sensor Technology

This document outlines correlation factors for various combustible gases that can be used to calibrate LEL sensors. It provides a table listing the LEL percentages and correlation factors for gases including butane, hexane, hydrogen, methane, pentane and propane when used as calibration gases for gases such as acetone, acetylene, benzene, ethanol and others. It notes that the correlation factors provided are averaged results for estimation only and calibration with a gas close to a factor of 1 is recommended for more accuracy.

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Florin Gheonea
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136 views1 page

LEL Correlation Factors: Battery & Sensor Technology

This document outlines correlation factors for various combustible gases that can be used to calibrate LEL sensors. It provides a table listing the LEL percentages and correlation factors for gases including butane, hexane, hydrogen, methane, pentane and propane when used as calibration gases for gases such as acetone, acetylene, benzene, ethanol and others. It notes that the correlation factors provided are averaged results for estimation only and calibration with a gas close to a factor of 1 is recommended for more accuracy.

Uploaded by

Florin Gheonea
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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BATTERY & SENSOR TECHNOLOGY

62

LEL Correlation Factors


The following chart outlines LEL correlation factors for combustible gas sensors.

CALIBRATION GAS
LEL * * * *
(% vol) Butane Hexane Hydrogen Methane Pentane Propane
Acetone 2.5% 1.06 0.70 1.70 1.70 0.90 1.10
Acetylene 2.5% 0.74 0.60 1.30 1.30 0.70 0.80
Benzene 1.2% 1.16 0.80 1.90 1.90 1.00 1.20
Butane 1.8% 1.00 0.55 1.69 1.58 0.79 0.98
Ethane 3.0% 0.84 0.60 1.30 1.30 0.70 0.80
Ethanol 3.3% 0.94 0.52 1.59 1.49 0.74 0.92
Ethylene 2.7% 0.84 0.60 1.40 1.30 0.70 0.90
Hexane 1.1% 1.81 1.00 3.04 2.86 1.42 1.77
GAS BEING SAMPLED

Hydrogen 4.0% 0.59 0.33 1.00 0.94 0.47 0.58


Isopropanol 2.0% 1.16 0.90 2.00 1.90 1.00 1.20
Methane 5.0% 0.63 0.35 1.06 1.00 0.50 0.62
Methanol 6.0% 0.63 0.50 1.10 1.10 0.60 0.70
Nonane 0.8% 2.34 1.30 3.95 3.71 1.84 2.29
Pentane 1.4% 1.28 0.71 2.15 2.02 1.00 1.25
Propane 2.1% 1.02 0.57 1.72 1.62 0.80 1.00
Styrene 0.9% 1.30 1.00 2.20 2.20 1.10 1.40
Toluene 1.1% 1.62 0.89 2.71 2.55 1.26 1.57
Xylene 1.1% 1.58 1.10 2.60 2.50 1.30 1.60
JP-4 — — — — — 1.20 —
JP-5 — — — — — 0.90 —
JP-8 — — — — — 1.50 —

Accuracy +/- 25% error

NOTE: Calibration gases available from Industrial Scientific Corporation

1. The correlation factors in the table are averaged results for estimation use only. It’s not recommended for analytical application with
high accuracy expectation.
2. The correlation factors may vary from sensor to sensor with tolerance of +/- 25% for new sensors. The number could further shift
for old sensors.
3. To get a more accurate result, it’s recommended to calibrate the instrument with a gas that has CF close to 1. The closer, the better.
4. It’s not recommended to use correlation factors if the target gas is methane and the sensor is old.
5. Expect more deviation when an old sensor is calibrated with methane gas.

* Prefered gases

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