Patent ID: 7888126

Claim:
An apparatus for measuring mercury concentration in a flue gas, the apparatus comprising a gas sample acquisition probe, a static filter, and an analyzer, wherein: the gas sample acquisition probe is configured to initiate transport of a gas sample from the flue gas to the static filter; the static filter comprises a porous filter element configured to remove particulate material from the gas sample and output a filtered gas sample; the analyzer is configured to measure the amount of gaseous mercury present in the filtered gas sample; the static filter comprises metal surfaces that are coated with a protective coating that reduces chemical reactivity of the metal surfaces to gaseous mercury; the chemical reactivity of the metal surfaces that is reduced comprises oxidation of elemental mercury to a chemically combined form of mercury and loss of oxidized mercury through adsorption on the metal surfaces; and the coated metal surfaces of the static filter are positioned to contact a gas sample flowing through the static filter.