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Trafag LEL gas instrument

Trafag LEL gas instrument

For instance, some brands of instruments equipped with miniaturised pellistor type LEL sensors have a dead-band that stretches all the way from -3% to +3% LEL. In other words, in the presence of a rising concentration of gas, the first reading displayed is 4% LEL. At 3% LEL the instrument reading is still"locked" on zero.

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