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We recommend that sensors should be calibrated using the gas for which they are intended to monitor as this method is more accurate than cross calibration. However, where this is not possible, cross calibration is a less accurate alternative method.
The following table lists theoretical K factors by which the signal with a cross-calibration gas should be multiplied to give the signal for other gases.
The information is provided in good faith but responsibility cannot be accepted for errors or omissions
CLICK TO SEE TABLE
For example:
To cross-calibrate an instrument to monitor %LEL propane in air, using a cylinder of 50% LEL methane gas in air.
K-METHANE = 112
K-PROPANE = 62
Adjust the SPAN potentiometer on the instrument to read 50(112/62) = 90.3% LEL
The instrument should now read the approximate %LEL concentration of propane at the sensor when the sensor is exposed to a concentration of propane in air.