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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 ?g/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.
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- Direct
reading mercury vapor meter
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- Portable, integrated battery for 6 hours operation
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- Proven reliable detection method: UV absorption
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- Automatic
zero adjustment
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- 0-100 /
0-1000 / 0-2000 ?g/m3
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- High
resolution 0.0001 mg/m3
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