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Gas sensor loop current or voltage at the sensor head is set as per the manufacturer’s recommended value.
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Gas monitor zero is adjusted to the instrument air.
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A test gas with a known quantity of combustion gas (Generally methane 2% by volume) is fed to the sensor and the span is adjusted to read 40% on the monitor scale (refer to the station drawings for the exact settings parameters).
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The calibration procedure is repeated until the zero and span reads correctly.
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