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Working Example:
If the target gas to be detected is 0-100 % LEL Ethylene and the only calibration gas available to re-
calibrate the sensor is Methane (at 50 % LEL concentration), the procedure is as follows:
Look up the star rating for each gas in Table 10.
Gas No. 14, Ethylene = 5*
Gas no. 18, Methane = 6*
Then, look up the span settings for a 50 % LEL calibration gas in Table 11 by selecting the row of figures
next to the 6* in the ‘calibration gas’ column. Select the figure in the 5* column of the ‘gas to be detected’
chapter.
This means that during re-calibration, the span gas setting on the gas detector transmitter or controller
should be set to 62 % LEL to give an accurate measuring scale for 0-100 % LEL Ethylene, when using
50 % LEL Methane as the calibration gas.
Contact your local Honeywell Analytics sales or service distributor, or regional office if further clarification
or additional information be required.
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