Mercury Vapor Monitor Model VM 3000
Continuous Mercury Measurement in Air and Other Gases
The VM-3000 Mercury Vapor Monitor measures the elemental mercury vapor concentration in air and other 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 Mercury Sniffer 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, If you need to monitor for mercury continuousely, this is the right mercury vapor analyzer for you.
Typical Applications for the VM 3000 Mercury Vapor Monitor
Mercury Vapor Analyzer 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 of Mercury Vapor Analyzer
The VM 3000 mercury vapor monitor 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.
Unlike the gold film based system, mercury vapor measurements are not interfered with by hydrogen sulfide (H2S) or water vapor. The extremely high stability of the UV source is a result of the reference beam feedback control method. Total background noise is less than 0.1 µg/m³. The VM 3000 mercury analyzer is calibrated before delivery and keeps the calibration for a long period of time. For quality control a test screen is included allowing the user to check calibration.
Mercury Vapor Detector Design Features
Easy to operate mercury vapor analyzer
The user controls the VM 3000 by menu guided inputs via a waterproof membrane keypad. After switch-on the light source is stabilized (approx. 1-5 minutes). When the measurement mode is started, a zero adjustment is first carried out automatically. Then the analyzer switches to measurement and continuously indicates the measured mercury content of the gas as a numerical value and a graphic bar.
The following settings are possible in the parameters menu:
- Duration and Repeat interval of zero adjustment,
- Selection of concentration unit (ug/m3 or ppb)
- Measuring range (0.1-100, 1-1000, 1-2000 ug/m3)
- Input of three different alarm levels
- Calculation of a mean value over three freely selectable time intervals
- Printer activation
- Sample dilution factor
- Self-Diagnosis of Mercury Locating System: Important components of the VM 3000 are permanently monitored. In case of malfunctions the user is warned on the display (blinking messages: clean cell, lamp) and via output signals.
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VM-3000 Mercury Vapor Monitor Technical Specifications
|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)|
|< 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|
|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.|