Explain the calibration procedure of a gas monitor system

  • Gas sensor loop current or voltage at the sensor head is set as per the manufacturer’s recommended value.

  • Gas monitor zero is adjusted to the instrument air.

  • 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).

  • The calibration procedure is repeated until the zero and span reads correctly.

1 Like