MMS Mercury Monitoring System

• Monitors 2 to 24 Measuring Points Automatically
• Versions for Air, Hydrogen, and other Gases
• Permanent Purging of all Sample Lines
• Ranges from 0.01 µg/m³ to 2000 µg/m³ Hg
• Automatic Calibration Module
• Software for Data Acquisition, Data Visualization and Storage

Benefits of the MMS Mercury Monitoring System:

• low maintenance demand
• No sensitivity for water vapor
• High stability of calibration
• Quick response time

Function

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 a highly accurate and selective mercury detector. 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 Mercury UltraTracer UT-3000 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:

monitoring of mercury in:

• chlor-alkali plants with mercury cells
• Metallurgical industry
• Fluorescent lamp production or recycling
• Battery recycling plants
• Natural gas industry
• Contaminated sites
• Hydrogen industry

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Technical Specifications of the MMS

Multiplexer Module

• Number of sampling points: 2 to 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

Detector

• Measuring principle: UV absorption at 253.7 nm
• Type for standard range: Mercury-Vapor-Monitor VM-3000
• Measuring range (standard): 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 fiber optic cable); modbus RTU; Ethernet

Mechanical

• 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

Software

• System requirement: PC with Windows XP, Vista
• Display of measuring data: actual readings numerically, filed data as time-concentration graphs