The VM-3000 Mercury Vapor Monitor measures the mercury concentration in gases continuously. It is used in the laboratory or can be installed at places where mercury has to be monitored. Industry people use the VM-3000 as well as university researchers or safety people. It is a great tool for plenty of different applications: work place monitoring, exhaust air monitoring, emissions monitoring in the chemical industry, ground air screening of contaminated areas, quality control of hydrogen and other gases, detector for laboratory applications.

VM-3000 Mercury Vapor Monitor Applications

Measuring principle

The sample gas is fed into an optical cell by a maintenance-free membrane pump. A beam of UV light passes through the optical cell, a part of it is absorbed by the mercury atoms present in the sample.

This method is called "atomic absorption spectroscopy" or shortly AAS. It is extremely selective and sensitive. For mercury determination the AAS method has maintained its importance even if other methods have been worked out since the early beginnings. The AAS method is low in interference and does not require an amalgamation step or expensive carrier gases.
 

Analytical Performance

The VM-3000 uses a high-frequency driven electrodeless low pressure mercury lamp as UV source. This lamp emits lines of an extremely narrow bandwidth which are congruent with the absorption lines of the Hg atoms. Cross-sensitivities are thus minimized. The extremely high stability of the UV source in the VM 3000 is a result of the reference beam feedback control method. Total background noise is less than 0.1 µg/m³.

VM-3000 Mercury Vapor Monitor Design Features

## Metal housing with sturdy handle 

##Option: Rack version with mounting brackets for 19" racks 

##Membrane pump with long service life 

##Sample inlet particle filter with easily replaceable filter membrane

##Factory-calibrated- no need for frequent recalibration due to high stability of the  optical and electronic system (short term factory recalibration services available)

Extensions

Such a combination model can be used for both applications: LabAnalyzer-254 and VM-3000.