Model SM-4 - Mobile Modular Stack Gas Monitor



The SM-4 mobile by Mercury Instruments was developed on the basis of the well proven SM-4 Stack gas monitor. Its measurement principle and technique, its thermocatalytic reactor, the detector and the sample probe are identical with those of the stationary SM-4.

  • Easy to transport
  • Qickly dismounted and reassembled
  • Sample dilution directly at the probe: eliminates interference with virtually any sample matrix
  • Maintenance free low temperature converter directly at stack: no transport of ionic mercury thus minimizing mercury adsorption
  • Detects total mercury
    (elemental, ionic and bound mercury))
  • Automatic calibration for elementary and ionic Hg
  • Automatic quality control (QAL3) during operation
  • Extremely wide range of measurement:
    0,05 bis 1000 µg/m³

Due to its modular design, the SM-4 mobile can easily be transported, assembled and disassembled. It is the ideal solution for the determination of total vapor phase mercury emissions at varying sites.

  • Coal fired power plants
  • Waste incineration plants
  • Sewage sludge incineration plants
  • Cement kilns
  • Recording of Hg-emission situations as well as determination of the efficency of
    Hg-reduction techniques
  • Method 30A applications
  • Testing of stationary CEMs
  • Optimizing of mercury control technologies

  • Modular construction
  • Easy to transport
  • Thermo-catalytic sample gas treatment, no reagents needed
  • Thermo-catalytic converter operating at low temperature (200°C)
  • Sample gas dilution avoids interferences
  • No generation of liquid waste or condensate
  • Extreme high sensitivity: low measuring range is 0.05 µg/m³
  • Heated particle filter with automatic cleansing
  • Fast response: t(90) time typically 180 sec
  • Length of sample line up to 100 meters
  • Integrated source of calibration gas for ionic mercury
  • Automatic quality control (QAL3)
  • Maintenance free

  • Sampling probe with dilution and converter unit
  • Probe controller box
  • Heated bundle containing sample line, air supply line, calibration gas feed line
  • Analyzer cabinet with detector and calibrator und Druckluftaufbereitung
  • Air conditioning cabinet with pressure gauges, air filters, membrane dryer

  • Measured component: Total mercury (ionic and elemental speciation as option)
  • Measurement principle: Dilution probe with thermo-catalytic converter at stack,
  • Amalgamation (MI GoldTrap),
  • Cold Vapor Atom Absorption Spectrometry (CVAAS),
  • Wavelength = 253,7 nm
  • Measuring range: 0,05 μg/m³ to 500 μg/m³ Hg
  • Detection limit: 0,0001 μg/m³ (Detector);
  • < 0,01 μg/m³ (System)
  • Response time: Typically 180 sec
  • Max. sample temperature: 250 °C
  • Ambient temperature range allowed: -5 to 40 °C
  • Sample line length: up to 90 m
  • Signal outputs:
    • analogue: 4-20 mA (500 Ω max.)
    • seriall: RS 232
    • Modbus RTU/RS485 (option)
  • Ethernet (option)
  • Status output: 3 x pairs of relay contacts (dry contacts)
  • Remote access: Modem and SM-4 software (option)
  • Power supply: 230 V / 50 Hz;
  • (110 V / 60 Hz option)
  • El. power consumption: Analyzer cabinet: 450 VA;
  • Air conditioning cabinet: 1000 VA;
  • Heated sample line: 30 VA per meter
  • Dimensions: Analyzer cabinet: 60 x 60 x 60 cm (H x W x T)
  • Air conditioning cabinet: 73 x 60 x 60 cm (H x W x D)
  • Probe: 75 x 38 x 34 cm (H x W x D)
  • Probe controller: 48 x 44 x 27 cm (H x W x D)
  • Weight: Analyzer cabinet: 50 kg
  • Air conditioning cabinet: 50kg
  • Probe converter unit: 28kg;
  • Probe controller: 14 kg
  • Air consumption: peak 35 l/min, 6 bar (87 PSI)
  • 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 for feed of externally provided calibration gas (e.g. HOVACAL®)
  • ISO 9001
  • 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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