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Automatic analyser for SO2, model 9850


Operation theory: The Sulfur dioxide 9850 is an advanced analyzer by chemiluminescence to measure reliable data of SO2.

The measure made by the 9850 analyzer depends on the fluorescent radiation produced by the SO2 molecules when they are excited by U.V. Radiation. The U.V. Radiation of excitation is the measured by a reference detector and the fluorescence radiation is measured by a photomultiplier tube (PMT). This two measures are related by the well-known technical of double channel to compensate the variations of intensity of the source of U.V. light, the optical pollution and the characteristics bias of the photomultipliers.

The interfering aromatic hydrocarbons are removed via a kicker device which is based in the  technical principle of the differential partial pressure to selectively remove aromatic hydrocarbons through a permeable membrane, not affecting the SO2 present in the sample.

The final concentration of SO2, corrected to changes of temperature and pressure, are shown on the screen in parts per million (ppm) or milligrams per cubic meter (mg/m3).

The equipment has a graphic display to show the averages, states and historical information in digital format. Through the menus the user can configure the equipment and have access to all the available options.

The 9850 analyzer selects automatically the optimal range of measure both in the screen and in the RS-232 interface output. The values are indicated in the floating point mode, which makes unnecessary the selection and indication of the range of measure. The equipment includes a characteristic of analogical over range that, in activated mode, commutes the analogical output of the analyzer to a ranger higher than the previously defined.

Characteristics and functions

  • European manufacturer ISO9001 certified to ensure the supply of analyzers of quality and exceptional performance
  • The analyzers are approved and certified by the US-EPA and have been contrasted with reference standards by US, UK and TÜV and operate between +5ºC and +40ºC
  • The SO2 analyzer offers equivalent results as the obtained by reference methods commons in USA and CE (USA equivalent method as defined in 40 CFR Part 53; EC: determination of sulphur dioxide - ISO/FDIS 10498 Determination of sulphur dioxide - Ultraviolet fluorescence method)
  • The 9850 analyzer uses a long lasting zinc lamp as an emission source of U.V. light that avoids interferences from vapor even in conditions of high humidity
  • Due to the fact that the 9850 equipment does not use a mechanical modulator, there is no need to change the belts or motor, which simplifies the maintenance labours
  • The equipment includes a self-diagnosis system and a full remote control through a RS-232 multipoint interface in order to optimize the service and maintenance availability
  • The analyzer has a wide LCD screen to watch simultaneously measure data and information regarding the working parameters
  • The analyzers from the 98xx series are noted for its modular design and for an internal performance at 12 Vcc with a consumption of less of 100 W
  • The equipment has an internal register for relevant events as zero and calibration or specific error indicators up to 20 events
  • It incorporates internal memory in the main board. The data stored can be obtained in a remote mode
  • The low flow of 0,6 l/min reduces the impact of the pollution of the fungibles and reduces the substitution costs and maintenance times
  • Karman digital filter to give more exactitude and better response to real variations of the atmospheric pollutants concentrations compared with the filters of fixed wide beam of linear type


  • Approval  Number: S-EPA: EQSA-0193-092 TÜV: RW-TÜV3.5.1/554/92
  • Range:
    • Digital and screen output: Self-range from 0 to 20 ppm. Resolution = 0,001 ppm
    • Analog output: 0 – full scale between 0-0,05 ppm and 0-20 ppm with 0, 5 and 10 % offset
    • Auto ranging analog output: two ranges selectable by the user: 0 – full scale
    • Range designed by USEPA: any range between 0-0,05 ppm and 0-1 ppm
  • Noise:
    • Measure process: 0,25 ppb or 0,1% of the reading, whichever is greater (with Kalman algorithm active)
    • Analog interface: 0,25 ppb or 0,1 % of the analog full scale, whichever is greater 
  • Sensitivity, Lower Detectable Limit: 
    • Mesure process: <0,5 ppb ó 0,2% of the concentration reading, whichever the greater (with Kalman filter active)
    • Analog interfase:<0,5 ppb or 0,2% of the analog full scale, whichever the greater
  • Zero Drift:
    • Temperature dependent:<0,1 ppb/ ºC
    • Time dependent, at fixed temperature:
      • <1 ppb / 24 h.
      • <1 ppb / 30 days
  • Span Drift:
    • Temperature dependent:<0,1 %/ ºC
    • Time dependent (at fixed temperature):
      • <0,5 %/24 hours of the concentration reading 
      • <0,5 %/30 days of the concentration reading 
  • Lag Time: <20 s.
  • Rise/Fall Time ,T95: <120 sec (with Kalman algorithm active)
  • Error lineality: ±1% of the full scale 
  • Precision: 0,5 ppb or 1 % of the concentration reading, whichever the greater
  • Sample Flow Rate: 0,6 l/min approx
  • Temperature Range: TÜV: +5°C to +40°C (41°F to 104°F) -USEPA: +15°C to +35°C (59°F to 95°F)
  • Power Supply:
    • 99 to 132 VCA, 198 to 264 VCA, 47 to 63 Hz
  • Weight: 21,3 Kg (47 lb).
  • Dimensions (w x h x d): 43,2cm x 17,8cm x 64,8cm.
  • Analog Output:
    • Menu selectable current output of 0 to 20 mA, 2 to 20 mA, or 4 to 20 mA
    • Optional vltage output with 50-pin connector board. Jumper selectable voltage output of 100 mV, 1 V, 5 V, and 10 V, with menu selectable zero offset of 0%, 5%, or 10%
  • Digital Output:
    • Multidrop RS232 port shared between analyzers for store of data, status and control

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