VM-3000
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. It is a great tool for plenty of different fields of applications in scientific research or the industrial sector:
- Work place monitoring
- Research and science
- Emissions monitoring
- Quality control of industrial gas
- Investigation of contaminated sites
- Environmental monitoring
- Hazardous waste inspection
- Additional information
- Meetprincipe
- Analytical performance
- Display and output of measurements
- Mobile use
- Multiplexer operation
- Special features
Additional information
| Gas Component | Hg |
|---|
Meetprincipe
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.
The lamp unit and detectors are temperature stabilzed to avoid temperature drift. Heating of the optical cell renders the VM-3000 insensitive to water vapor.
Display and output of measurements
The result of a measurement is displayed in real time and output as an analogue electrical signal of 4-20 mA. The device also features digital outputs for alarm, status and measurement values for full integration in plant control systems as well as a serial interface (RS 232 / USB) for data transfer to a PC or Laptop (Software „Hg-Transfer“ included on delivery).
Thanks to the built-in p- and T-sensors the Hg-concentration can be output as μg/Nm³ (μg/cubic metre at normal temperature and pressure).
Mobile use
The easy to carry VM-3000 is well suited for indoor and outdoor mobile use.
Sources of mercury contamination or leakage are easily found. To that purpose an integrated 12 VDC battery pack (with charger) and a sampling probe are available as options.
Alternatively, the VM-3000 can be run on an external 12 VDC power source.
For prevailing mobile use we recommend the specially designed Tracker-3000 XS.
Multiplexer operation
The VM-3000 can be combined with a multiplexer unit for automatic monitoring of several different measurement points.
For further information see procuct page Mercury Monitoring System (MMS).
Special 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) - Outputs: analogue 4…20 mA; serial (RS 232 / USB); parallel (Centronics)
- Alarm: Status output
- Integrated datalogger (option)
