Black Carbon Monitor - PAX (Photoacoustic Extinctiometer)

The new Photoacoustic Extinctiometer (PAX) is a sensitive, high-resolution, fast-response instrument for measuring aerosol optical properties relevant for climate change and carbon particle sensing. The instrument directly measures in-situ light absorption and scattering of aerosol particles, from which it derives extinction, single scattering albedo and black carbon (soot) mass concentration. With no filter collection required, and consequently no filter-media artifacts, the PAX provides a highly accurate measure of absorption from black carbon.


  • Direct in-situ measurement of light absorption and scattering in a single instrument
  • Absorption measurement correlates to black carbon mass concentration
  • Reciprocal nephelometry provides excellent scattering coefficient sensitivity
  • Choice of wavelengths: 870 nm (standard); optional 405 nm, 532 nm or 781 nm
  • Fast response, one-second resolution, real-time data display
  • Wide dynamic range suitable for pristine regions to source sampling
  • Continuous and autonomous operation
  • High-resolution touch screen display for real-time data and instrument status
  • No filter collection required - no filter data artifacts



  • Air quality and visibility
  • Atmosphere and climate
  • Health effects
  • Combustion source emissions
  • Biomass burning
    Suitable for fixed site, mobile or airborne sampling

All Droplet Measurement Technologies are sold with 1 years parts warranty as STANDARD.

The warranty can, at additional cost, be extended for total peace of mind. Please call to discuss options for this.

Droplet Measurement Technologies monitors require periodic service and maintenance to both satisfy the requirements of the warranty and to ensure that the highest possible data capture rates are maintained.

Enviro Technology has a large team of in-house and field based service engineers who regularly receive “factory training” and can provide the very best levels of service and support.

Enviro Technology and Droplet Measurement Technologies recommend that the PAX Black Carbon Monitor is serviced every 6 months of continuous operation.

A wide range of servicing options are available and can include:

- Pre-scheduled on-site planned maintenance (every 6 months).

- Emergency on-site call-out within agreed timescales (i.e. 48 hours).

- Supply of consumable items (i.e. sample inlet filters).

- Supply of calibration gases and permeation tubes.

- Supply of permeation tube calibrators and zero air generators

- Remote analyser “health-checks” and diagnostics.

- Return-to-base servicing options.

- Local site operation services.

- Data collection and data management services.

Please contact either our sales or customer services teams to request a quotation for on going servicing and maintenance on this analyser.

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