The AMNG Mercury Monitor is designed for continuous, on-line measurement of mercury in natural gas or other gaseous fuels. The monitor components can be housed in a variety of enclosures, including a general-purpose 19” rack-mount enclosure, a purged enclosure, or an explosion-proof enclosure. Utilizing Zeeman Background Correction technology, the monitor is capable of measuring low mercury concentrations while correcting for interferences in the gas stream. Automatic zero and span corrections allow for stable long-term operation with low maintenance requirements.