Thermo Scientific™

8500 Filter Dynamics Measurement System

 Related applications:
Measure the amount of volatile and non-volatile components of ambient particulate matter as a mass concentration result with the Thermo Scientific™ 8500 Filter Dynamics Measurement System, which is a conditioning system for use with the Thermo Scientific™ TEOM™ 1400ab Ambient Particulate Monitor.

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Key Features:
  • Utilizes a combination of technologies including true-mass filter-based TEOM microbalance, a diffusion drying system, and an innovative self-referencing methodology
  • System's basic output consists of running one-hour average mass concentration (in micrograms per cubic meter) of PM-10, PM-2.5, or PM-1 updated every six minutes
  • Scientifically validated - total mass of aerosol chemical species
  • Designed to provide high-quality, representative PM mass concentration readings for both short-term averages (one hour) as well as 24-hour averages
  • Computes base mass concentration and reference mass concentration over the same averaging times

Instrument Performance (3L/min., 1 s, stable conditions):

Minimum Detectable Limit for Mass Measurement: 10 nanograms, 0.06μg/m3 (one-hour average)

Flow Control

  • Active volumetric flow control of sample stream using ambient temperature and pressure sensors
  • Mass concentration expressed either in standard or actual terms (user selectable)

Sample Conditioning System

  • Filter Dynamics Measurement System (FDMS) dryer contains specially designed Nafion tubing inlet on the main flow to minimize potential for particle loss; the dryer lowers the main flow relative humidity, and allows for mass transducer operation at 5°C above the peak air monitoring station temperature
  • Purge Filter Conditioner contains a heat exchanger that maintains the temperature of the main air flow and particle filter at 4°C
  • An integrated humidity sensor that follows the SES dryer measures the humidity of the main flow line to determine the drying efficiency

Data Averaging and Output

  • System computes mass concentration information as mass concentration (sample MC adjusted by purge MC), volatility coefficient, volatile mass concentration and nonvolatile mass concentration
  • Real-time Mass Concentration Averages: 1 hour running average, updated every six minutes
  • Long-Term Averaging: 1, 8 (user selectable), 12 and 24 hour, updated every hour

Filter Media

  • Collection Filter: Pallflex TX40, 13mm effective diameter. Must use molded TEOM-style filter cartridge
  • Purge Filter: 47mm diameter filter housed in an FRM-style molded filter cassette, maintained at 4°C; suitable for collecting and archiving time-integrated particulate matter samples for subsequent laboratory analysis


TEOM 1400ab Ambient Particulate Monitor.

Compatible with:

  • Streamline Pro MultiCal System
  • Complete Outdoor enclosure

Recommended for:

  • Air quality monitoring networks, including background sites
  • Special studies and super-sites
  • Routine input for air quality index
  • Industrial and material handling facilities
  • Remediation projects (Superfund, hazardous waste)
  • Indoor air, exposure chamber, and industrial hygiene measurements
User services

Order status 
Review your order status.

Service offerings
Overview of all services including support plan options, repairs and calibrations, spare parts and technical training.

Factory Depot 
Request an RMA number and send your instrument to our factory for repair.

Service offering

Protect the investment you've made in the 8500 FDMS and keep it running at peak performance with the Thermo Scientific Particulate Dryer Maintenance Program.

  • Reduce the risks of particulate overload
  • Ensure peak-performance of your instrument
  • Three high quality replacement options
  • Flexible choices to suit your needs


Manuals & protocols