Relative Responses Of Gas Types - Crowcon IRmax Installation, Operating And Maintenance Instructions

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3. Operation

3.4 Relative responses of gas types

The graph below shows the relative responses to other gas types for an IRmax calibrated
on methane.
Note: many hydrocarbon gases and vapours are more easily detected by IR
detectors than methane. The response of IRmax (and other IR gas detectors) will be
linear across the 0-100%LEL range for the target gas (ie methane in this example),
but non-linear for other hydrocarbons that may also be present.
Diagram 8
The diagram shows the approximate response of the gases mentioned above: from left to
right, butane, propane, pentane, hexane & petrol vapour and methane.
Other gas types and ranges are available. Please contact Crowcon for further details.
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Detecting Gas Saving Lives