VM-3000 Mercury Vapor Monitor Detection of Mercury in Air and other Gases

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VM-3000 Mercury Vapor Monitor
Detection of Mercury in Air and other Gases

VM-3000 Mercury Vapor Monitor

 

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

  • 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 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)

 Mercury Instruments | Mercury LabAnalyzer 254

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: 0.1 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.

   

 

Extensions

An optional reaction unit and activation of the according software turns it into a laboratory unit for liquid samples (= LabAnalyzer-254).

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