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Mercury Monitoring System


Automatic monitoring of mercury in air and other gases




  • Monitors 2 to 24 measuring points automatically
  • Versions for air, hydrogen and other gases available
  • Permanent purging of all sample lines
  • Measuring ranges from 0.01 µg/m³ to 2000 µg/m³ Hg
  • Software for data acquisition, data visualisation and storage
  • Automatic Calibration Module




  • Chlorine-alkaline plants with mercury cells
  • Metallurgical industry
  • Fluorescent lamp production and recycling
  • Battery recycling plants
  • Contaminated sites
  • Hydrogen production plants
  • Laboratories or processing plants working with mercury
  • Natural gas industry
    see also product pages for natural gas systems:

    VM_3000 Product page:

    VM_3000 Product page:
    UT-3000 NG mobile



Examples for different applications of the MMS:

link zu MI-News Goldmine in Marathon, Canada

link zu MI-News Cellroom in Newcastle, USA






The sample is continuously drawn from each sampling point through special tubing to a heated multiplexer valve unit. One sample at a time is fed into the Mercury Vapor Monitor where the mercury concentration is measured. All sample lines are permanently purged with sample thus minimizing the response time of the system. This method allows for sample line lengths of 100 meters and more.


System design



The MMS system basically comprises a multiplexer-valve unit and the highly accurate and selective mercury detector VM-3000 Vapor Monitor. A bypass pump maintains a steady flow of sample through the sample filters, sample lines and multiplexer valves. Flow meters with optical alarm sensors guarantee that flow rates are stable. All components are installed inside a protective cabinet.

A special version employing the UT-3000 Mercury Ultratracer as detector is available for concentrations in the sub-µg/m³ range.

Options like air conditioning assure reliable function of the system even under extreme climatic conditions.


Data output


The analyzer unit can be connected to a PC with a serial cable or optionally with a fibre optic cable for operation under harsh industrial conditions.

Modbus or ethernet communication is available.

Stand-alone operation without PC connection is also possible.


MMS 2018

Storage of measuring data


Measurement data are stored on hard disk as ASCII- and EXCEL files. Filed data can be retrieved at any time as graphic diagrams. A friendly search function enables the user to quickly find data of selected time intervals or data exceeding a threshold value.


Self diagnosis of the system and calibration


The MMS software permanently checks the status of the system. Low flow of bypass stream or sample, plugging up of sample filters and photometer malfunctions are detected by the system and an error message is displayed.

An optional calibration module allows automatic calibration checks and re-calibrations of the system. The calibration gas is generated by mercury vapor saturation of air and automatic dilution. The mercury filling of the calibrator is sufficient for the entire lifetime of the instrument.


Software and remote control of the analyzer system


The MMS-Win software allows remote control of the analyzer-multiplexer system via PC. It provides information to the operator such as: mercury concentrations for each sample point, history of measurement results for each sample point, status of the system and calibration information.

Alarm thresholds, duration of measurement for each channel, zero adjustment and specific deactivation of measuring points can be controlled by PC.

The operator can interrupt any running measurement and select a sample point for immediate measurement. It is also possible to deactivate any sample point. Emission reports are created automatically and stored as *.txt and *.xls (EXCEL) files.

Screenshots of software MMS-Win, clockwise from top to bottom:

Main window of MMS-Win with position of sampling points;
Time course of mean Hg-concentration channel 9;
Setting of alarm thresholds;
Measurement data displayed in EXCEL;



Benefits of the Mercury Monitoring System MMS

MMS img_0281


  • low maintenance demand
  • no sensitivity for water vapor
  • high stability of calibration
  • quick response time
  • customized software
  • minimized memory effect

Mercury Monitoring System MMS:
Technical Specifications


Multiplexer Module

Number of sampling points:

2 ... 24

Purging of sample lines:

approx. 40 - 80 l/h for each channel

Flow control:

Flow meters with alarm sensors for low flow

Heating of valve unit:

approx. 70 °C

Measuring duration:

45 sec - 99 minutes,
separately adjustable for each channel



Measuring principle:

UV absorption (CVAAS),
Wavelength = 253,7 nm

Principle of preconcentration:
(only special version with

Amalgamation on gold surface,
thermal desorption by rapid heating
(MI GoldTrap)

Measuring ranges:
(standard version with VM-3000)

  • 0,1 - 100 µg/m³
  • 1 - 1000 µg/m³
  • 1 - 2000 µg/m³

Measuring range:
(special version with UT-3000)

  • 0,01 - 50 µg/m³

Sample flow:

approx. 80 l/h per channel

Signal output:

  • analogue: 4-20 mA
  • serial: RS 232
  • Modbus RTU (optional)
  • Ethernet (optional)


Construction, weight and Dimensions


metal, protection standard IP 55 (NEMA 4X, others as an option)


from 553 x 600 x 500 mm (WxHxD) to 800 x 2000 x 600 mm; according to number of channels and optional equipment (air conditioning)


approx. 35 - 175 kg; depending on number of channels and optional equipment



System requirements:

PC with Windows XP or higher

Display of measuring data:

current readings numerically, filed data as concentration-time graphs

As a leading supplier of high precision analytical equipment, we strive at all times to offer top quality solutions. Our quality management system is certified according to ISO 9001.

MMS cover

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