The following instruments, when used in conjunction with the EERC conversion system, are able to measure speciated mercury.

PS Analytical Sir Galahad
The Sir Galahad analyzer was initially used to monitor total mercury continuously in the urban environment and in natural gas, but it can also be used in a variety of gaseous media, including combustion flue gas. The analyzer is based on the principle of atomic fluorescence, which provides an inherently more sensitive signal than atomic absorption. The system uses a gold-impregnated silica support for preconcentrating the mercury and separating it from potential interferences that degrade sensitivity.

The Sir Galahad requires a four-step process to obtain a flue gas mercury measurement. In the first step, 2 L of flue gas is pumped through a gold trap, which is maintained at a constant temperature. Before the mercury is desorbed from the gold trap, a flushing step is initiated to remove any flue gas that may be present, because it has a damping effect on the mercury fluorescence. When this is completed, the analysis step begins. The heating coil is activated, and the gold trap is heated to approximately 500ºC. This desorbs the mercury from the trap, and the mercury is carried into the fluorescence detector. The gold trap is cooled rapidly by pumping argon over it in preparation for the next sample. The total time for the entire process is about 5 minutes.

The system is calibrated using Hg⁰ as the primary standard. The Hg⁰ is contained in a closed vial, which is held in a thermostatic bath. The temperature of the mercury is monitored, and the amount of mercury is measured using vapor pressure calculations. Typically, calibration of the unit has proven stable over a 24-hour period.

Tekran
The Tekran analyzer was initially used primarily to monitor ambient mercury, but it can also be used in a variety of gaseous media, including combustion flue gas. The analyzer is based on the principle of atomic fluorescence, which provides an inherently more sensitive signal than atomic absorption.

Semtech Hg 2000
The commercial Semtech Hg 2000 mercury analyzer (Semtech Metallurgy AB, Lund, Sweden) is essentially a portable Zeeman-modulated cold-vapor atomic absorption spectroscope that can monitor Hg⁰ continuously. The analyzer uses Zeeman-effect background correction by applying a modulated magnetic field to a mercury lamp to minimize interferences from the presence of SO₂, hydrocarbons, and fine particulate in the flue gas sample. The operating range of the analyzer is 0.3 µg/Nm³-20 mg/Nm³ Hg⁰, as specified by Semtech Metallurgy AB. The Semtech Hg 2000 has also been certified by TUEV Rheinland for determining compliance with the German legal limit of 50 µg/Nm³ for total mercury from waste incinerators.