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Automatic analyser for O3, model 9810


Operation theory: The ozone (O3) analyser is an ultraviolet photometer that gives accurate and reliable measure of ozone in the air.

Once the gas sample enters the pneumatic system, that sample containing ozone goes to a scrubber (selective absorbent of ozone) that converts ozone in to oxygen. This sample, without ozone, goes to a chamber where a detector measures the UV radiation quantity transmitted in the range of 254 nm. This intensity is defined as “Io” and its value includes all other gases or particulate material that can be present in the sample.

After the reference cycle is completed, the gas sample containing ozone passes to the pneumatic system without the scrubber and goes to the chamber directly. The U.V. radiation measure on this sample is called “I”.

The microprocessor and electronics of the ML9810B control, measure and correct for all the major external variables to ensure stable and reliable operation. For example, the absorption coefficient is temperature and pressure sensitive.

Characteristics and functions

  • European manufacturer ISO 9001 certified to ensure the supply of equipment of higher quality
  • USEPA Automated Equivalent Method
  • The 9810 analyser uses a reaction simple chamber of crystal of reduced size that reduces the loss of ozone. There are no alignment mirrors. Both characteristics increase the data quality and reduce the maintenance works
  • The low flow of the equipment reduces the pollution of the components of the equipment and the maintenance periods
  • The equipment includes diagnosis system and remote control via RS-232 to optimise the service and the maintenance
  • Large Graphic LCD provides advanced continuous system faults messages, status outputs and other state of the equipment
  • The 9810 analyser has a modular design and inner operation of 12 VDC
  • The ML9800 analyzer family uses the advanced digital Kalman filter. This filter provides the best possible compromise time and noise reduction for the type of signal and noise present in ambient air analysers and their applications


  • Approval number: US-EPA: EQOA-0193-091 TÜV: UMEG-33-2/94
  • Range:
    • Display: Autoranging 0 to 20 ppm. Resolution = 0,001 ppm
    • Analog output: 0,05 to 20 ppm with 0%, 5% and 10% offset
    • Autoranging analog output between two user-specified full scale values
    • Range designed by USEPA: any range between 0-0,05 ppm and 0-1ppm
  • Noise:
    • Analog output: 0,0005 ppm or 0,05% of analog output full scale, whichever is greater
    • Digital output: 0,0005 ppm with adaptative (Kalman) filter active
  • Lower Detectable Limit:
    • Analog: 0,001 ppm or 0,1% of analog output full scale, whichever is greater
    • Digital: Less than 0,001 ppm with adaptive (KAlman) filter active
  • Zero Drift:
    • Temperature dependent, 0,001 ppm/ºC
    • Time dependent, at fixed temperature:
      • 24 hours: Less than 0,001 ppm
      • 30 days: Less than 0,001 ppm
  • Span Drift:
    • Temperature dependent, 0,002 ppm/ºC at 0,4 ppm O3
    • Time dependent, at fixed temperature:
      • 24 hours: 0,5% of reading
      • 30 days: 0,5% of reading 
  • Lag time: <20 s.
  • Rise/Fall Time: 95% of final value. Less than 60 seconds with Kalman active
  • Error lineality: ±1% of full scale
  • Precision: 1 ppb or 1% of the reading, whichever is greater
  • Sample Flow Rate: 0,5 l/m
  • Temperature Range:
    • TUEV: +5°C to +40°C (41°F a 104°F)
    • USEPA :+15°C to +35°C (59°F a 95°F)
  • Power: 99 to 132 VAC, 198 to 264 VAC, 47 to 63 Hz
  • Weight: 21,3 Kg (47 lb)
  • Dimensions (w x h x d):
    • 43,2 cm x 17,8 cm x 64,8 cm
  • Analog output:
    • Menu selectable current output of 0 to 20 mA, 2 to 20 mA, or 4 to 20 mA
    • Optional voltage output with 50-pin connector board. Jumper selectable voltage output of 100 mV, 1 V, 5V, 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
    • DB50 with discrete status, user control, and analog output

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