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Mercury Monitoring System



Automatic Monitoring of Mercury in Air
and other Gases

Mercury Instruments MMS



  • 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



Benefits of the MMS
Mercury Monitoring System:


  • low maintenance demand
  • no sensitivity for water vapor
  • high stability of calibration
  • quick response time



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. By this method sample line lengths of 100 m and even more can be employed.

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.

Applications of the MMS:

  • chlor-alkali plants with mercury cells
  • metallurgical industry
  • fluorescent lamp production or 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: MMS-NG, UT-3000 NG mobile


Mercury Monitoring System MMS: Technical Specifications

Multiplexer Module
Number of sampling points:  2 ... 24
Purging of sample lines:  continuously, ca. 40 ... 80 l/h for each channel
Flow control: Flow meters with alarm sensors for low flow
Heating of valve unit:   approx. 70 °C
Sample line connectors: fittings for 4 mm i.d./ 6 mm o.d. tubing
Valves: minimum dead volume
Measuring duration: 45 sec ... 99 minutes, adjustable separately for each channel

Measuring principle:  UV absorption at 253.7 nm
Type for standard range: Mercury-Vapor-Monitor VM-3000
Measuring range

0.1 to 100 µg/m³; 1 to 1000 µg/m³; 1 to 2000 µg/m³
Type for low range: Mercury Ultratracer UT-3000
Measuring range (low range): 0.01 to 50 µg/m³
Sample flow: ca. 80 l/h
PC connection: serial protocol RS 232; connection by cable (optionally by fibre optic cable);
modbus RTU; ethernet

Construction, weight and dimensions:
Cabinet: metal, protection standard IP 55 (NEMA 4X, others as an option)
Dimensions: from 553 x 600 x 500 mm (WxHxD) to 800 x 2000 x 600 mm; according to channel number and optional equipment (air conditioning)
Weight: approx. 35 - 175 kg; depending on number of channels and optional equipment

System requirement:  PC with Windows XP and higher
Display of measuring data: current readings numerically, filed data as time-concentration graphs
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.



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