Which gas is used to calibrate the LEL on the MiniRAE 3000?

Which gas is used to calibrate the LEL on the MiniRAE 3000?

• A. Methane
• B. Ethane
• C. Propane
• D. Butane

Answer: (A)

Calibrating a LEL (Lower Explosive Limit) sensor uses a universal reference gas so readings are consistent across different detectors. Methane is that standard because the LEL measurement is defined relative to methane in air: 100% LEL corresponds to about 5% methane in air. Using methane as the calibration gas provides a stable, well-defined baseline that makes the LEL readings comparable and reliable. Other hydrocarbons have different LEL values, so calibrating with them would shift the scale and produce inconsistent results. Since methane provides the agreed baseline for LEL, it’s the gas used for calibrating the MiniRAE 3000’s LEL sensor.

Calibrating a LEL (Lower Explosive Limit) sensor uses a universal reference gas so readings are consistent across different detectors. Methane is that standard because the LEL measurement is defined relative to methane in air: 100% LEL corresponds to about 5% methane in air. Using methane as the calibration gas provides a stable, well-defined baseline that makes the LEL readings comparable and reliable. Other hydrocarbons have different LEL values, so calibrating with them would shift the scale and produce inconsistent results. Since methane provides the agreed baseline for LEL, it’s the gas used for calibrating the MiniRAE 3000’s LEL sensor.