The JJF 1263-2010 standard applies to the calibrating of sulfur hexafluoride detection alarms, including the calibrating of leak detectors and Miscellaneous related detection instruments. Sulfur hexafluoride detection alarms are widely used in electric power, power grid, metallurgy and scientific research fields to detect and alarm the concentration of sulfur hexafluoride gas. The instrument usually adopts the principles of ultraviolet ionization type, negative voltage corona type, local vacuum type or electron capture type for Gas detection. The standard covers the main components of the instrument, such as Light source, ionization system, gas circuit and circuit system, and details the working principle of ultraviolet ionization type instrument and its calibration method to ensure detection accuracy and Reliability.