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Mercury Vapor Monitor
VM-3000

 

Continuous Measurement of Mercury in Air and other Gases

VM-3000 Mercury Vapor Monitor

Mercury Vapor Monitor VM-3000 Applications

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:

  • Health & safety
  • Occupational hygiene
  • Work place monitoring
  • Mercury spills screening
  • Research & Mercury surveys
  • Investigation of contaminated sites
  • Environmental Monitoring
  • Hazardous Waste Inspection

 

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 (EDL) 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

  • Mercury Vapor Monitor VM-3000 Front
    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)

VM-3000 Mercury Vapor Monitor: Technical Specifications

Measuring principle:  UV-Absorption 
Wavelength:  253.7 nm
UV source:  electrodeless low-pressure mercury lamp (EDL)
Measuring cell: fused silica, heated to avoid condensation
Stabilization method:  lamp control by reference beam feedback; Auto-zero
Measuring ranges:  range I: 0 to 100 µg/m³ (0.01-10 ppb)
range II: 0 to 1000 µg/m³
range III: 0 to 2000 µg/m³ (0-200 ppb)
Sensitivity:  0.1 µg/m³ (0.01 ppb)
Response time
(99% signal): 
< 1 second ; continuous operation and real-time reading
Alarm:  3 levels programmable
Status alarms:  measuring cell soiled, battery state (option, UV source exhausted
Display:  graphical LC display with background illumination
Signal outputs:  4...20 mA; RS 232 for PC or printer ; data logger function (option)
Battery option:  external 12 DC source; optional 12 V batteries integrated, ca. 5h capacity
Mercury Instruments As a leading supplier of high precision analytical equipment, we strive at all times to offer top quality solutions. Our products are manufactured according to the ISO 9001 quality regulations.

 

VM-3000 cover

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Mercury LabAnalyzer 254

Extensions

An optional reaction unit and activation of the appropriate software turn the VM-3000 into a laboratory unit for liquid samples
(= LabAnalyzer-254).

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