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Total Mercury Emissions Monitor in Stack Flue Gas, QAL 1 Certified


QAL 1 certified for continuous, accurate and reliable measurement of total mercury emissions, even in very low concentrations and within complex matrices (SO2, NOx, HCl, etc.)

With over 20 years experience, Mercury Instruments (part of ENVEA Group) were the first to develop mercury monitors and mercury analyzers using a dry thermocatalytic method instead of wet chemistry.

The SM-4 Mercury Monitor is QAL1 certified and is ready to meet future regulatory  requirements (Minamata convention & European directives for thermal power plants and incinerators).


Have questions? Call +61 2 9622 6327

  • Automatic and continuous monitoring of total mercury emissions in stack flue gases. QAL 1 certified
  • Extremely high precision and reliable measurement
  • Automatic back-flush function
  • Continuous measurement of total Hg (elementary, ionic & organic)
  • No liquid waste or condensate generated
  • Sample dilution directly at sampling point, allowing for large measuring range & elimination of interferences from matrix gases, no transport of ionic Hg
  • Sampling system – composed of the probe, the dilution unit and the low temperature catalytic converter – is entirely heated to avoid mercury adsorption
  • Very low maintenance (service interval: ≥ 3 months) – can be automated
  • Ultra high sensitivity: low measuring range is 0.05 µg/m³
  • Approved and certified by TÜV Rheinland (QAL1)


    • Main options:
  • Mercury speciation
  • Elemental Hg calibration gas generator NIST traceable, installed inside the analyzer cabinet
  • Automatic calibration systems (oxidized and elemental)
  • Automatic QAL3
  • Sampling line length up to 100 m (300 ft)

Mercury monitor perfectly adapted for continuous mercury analysis in:

  • Coal fired power plants (before & after mercury absorbers)
  • Emissions monitoring for facilities under 13. and 17. BImSchV
  • Cement kilns
  • Sulfuric acid producing foundries
  • Waste Incineration plants (industrial, medical waste, sewage sludge…)
  • Thermal treatment of contaminated soils, hazardous waste
  • Metallurgical facilities with potential Hg emissions…
Measuring principlethermocatalytic reduction at stack, Amalgamation (MI GoldTrap),
cold vapor atomic absorption (CVAAS) at 253.7 nm
Measured componentTotal mercury (ionic and elemental speciation as option)
UV-SourceElectrodeless low pressure mercury lamp (EDL)
Stabilization methodReference beam method
Optical cellFused silica (Suprasil), l: approx. 230mm, heated approx. 45°
Measuring ranges0.05 μg/m³ – 500 μg/m³ Hg (up to 1000 µg/m³ as an option)
Detection limit0.0001 μg/m³ (Detector); < 0.01 μg/m³ (System)
Response time T90180 – 360 sec
Calibration– automatic, with built-in calibration gas generator for elementary Hg (option);
– automatic, with built-in calibration gas generator for ionic Hg (option);
– manual, with built-in heated fitting to connect externally provided calibration gas (e.g. HOVACAL®)
Signal outputsanalogue: 4-20 mA (500 Ω max.);
serial: RS232;
Modbus RTU/RS485 (option);
Ethernet (option)
Status output3 x pairs of relay contacts (dry contacts)
Remote accessModem and SM-4 software (option)
Max. sample temperature250 °C (others upon request)
Ambient temperature range allowed-5 to 40 °C
Sample line lengthup to 30 m (up to 100 m option)
Power supply230 VAC / 50 Hz (110 VAC / 60 Hz option)
Electrical Power consumptionAnalyzer cabinet: 450 VA;
Probe-converter unit: 1000 VA;
heated sample line: 30 VA / meter
Dimensions (H x W x D)Analyzer cabinet: 161 x 80 x 60 cm;
Probe converter unit: 36 x 36 x 66 cm;
Probe controller: 48 x 44 x 27 cm
WeightAnalyzer cabinet (including automatic calibrator): 130 kg;
Probe converter unit: 28 kg;
Probe controller: 14 kg

Compliance with:

  • US EPA 40CFR60 PS-12A Mercury CEMS;
  • Minamata convention & European directives for thermal power plants and incinerators
  • EN 15267 (European regulation);
  • Industrial Emissions Directive (IED)
  • Integrated Pollution Prevention Control (IPPC) Directive,
  • Large Combustion Plant Directive (LCPD)
  • Medium Combustion Plant – MCP Directive (EU) 2015/2193
  • Waste Incineration Directive (WID)

Approved and QAL 1 certified by TÜV Rheinland Energie und Umwelt GmbH, Köln, (QAL1)

Our mercury analyzers are manufactured according to the ISO 9001 quality regulations.

CE approved


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