Filter.
Type to search element
Type de mesure
Show More
Technologie de mesure
Show More
marque
Show More
L'industrie
Show More
The mercury
concentration is measured in an optical cell entirely made of a high purity
grade fused silica. A maintenance-free membrane pump continuously feeds the
sample gas to the optical cell where light absorption measurement takes place
at a wavelength of 253.7 nm. This so-called "cold vapor" measuring
method is extremely sensitive for mercury determination and has been used
successfully for many years.
The Mercury
Tracker 3000 uses a high-frequency driven electrodeless Hg low pressure (EDL) lamp
as UV source. It generates emission lines of an extremely narrow bandwidth
which are congruent with the absorption lines of the Hg atoms.
Cross-sensitivities are thus minimized. Unlike the gold film based systems
measurements are not interfered by H2S. The extremely high stability of the UV
source is a result of the reference beam method which is applied in the Mercury
Tracker 3000. Total background noise is less than 0.1 µg/m3. To prevent
temperature drift both the lamp unit and the detectors are temperature-stabilized.
The instrument is calibrated before delivery and keeps the calibration for a
long period of time. For quality control a test screen is included in the
delivery allowing the user to check calibration.