Thermo Scientific™

1405-F TEOM™ Continuous Ambient Air Monitor

 Related applications:
Take continuous direct measurements of PM-10, PM-2.5, and PM-1 particulates using the Thermo Scientific™ 1405-F TEOM™ Continuous Ambient Air Monitor. This monitor utilizes a tapered element oscillating microbalance (TEOM) and Filter Dynamics Measurement System (FDMS) to provide measurements with excellent short-term precision and account for volatile and nonvolatile PM fractions.

Error loading your content!

  Catalog number Price ({{currency}}) Availability Qty
also known as {{product.formattedSku}} 
{{product.availability.message}} Add To Cart

{{addItemToList.successMessage}} {{addItemToList.listName}}

Back to top


The 1405-F TEOM Monitor consists of a Filter Dynamics Measurement System (FDMS) and TEOM mass sensor housed in a single-cabinet compact enclosure, and network-ready configuration that includes a control system with touchscreen user interface. The 1405-F TEOM distinguishes itself from other PM measurement methods by utilizing a direct mass measurement that is not subject to measurement uncertainties found in surrogate techniques. It provides a self-referencing, NIST-traceable true mass measurement.

Key Features:

  • Design that meets U.S. and International Particulate Monitoring Regulations
  • Touch-screen GUI interface quickly and intuitively accesses system status, TEOM data, settings, and instrument conditions
  • Service screen provides access to software wizards which walk the user through calibration and maintenance procedures with detailed instructions and pictures

Standard System Configuration:

  • Menu-driven software for user interaction via a touch-screen display
  • ActiVol flow control using Automatic Mass Flow Controller(s) and supplied Ambient Temperature and Ambient Pressure Sensors
  • ePort software for local or remote communication, USB port for automated download System configurations include PM-10 and PM-2.5

Data Averaging

  • Real-time Mass Concentration Average: One hour rolling average updated every six minutes
  • Long-Term Averaging: 1, 8, 24 hr.

Sample Flow

Activol flow control system uses the mass flow sensors and the measured ambient temperature and pressure to maintain constant volumetric flow rates.

Filter Media

  • Sample Filter: Pallflex TX40, 13mm effective diameter
  • Sample Conditioner Filter: 47mm diameter housed in an FRM-style molded filter cassette, maintained at 4°C; suitable for collecting and archiving time-integrated PM samples for subsequent laboratory analysis

Sample Conditioning

  • Nafion dryer lowers the main flow relative humidity and allows for mass transducer operation at 5°C over the peak air monitoring station temperature
  • Purge Filter Conditioner contains a heat exchanger that maintains the temperature of the main flow and particle filter at 4°C to efficiently filter the volatile and nonvolatile PM in the sample


  • Connecting and interface cables and vacuum pump
  • Consumables for average first year operation (ambient), excluding pump and FDMS dryer refurbishment parts
  • Pallflex TX40 Filter, 13mm effective diameter

Compatible with:

  • Streamline Pro MultiCal System
  • Complete Outdoor Enclosure

Recommended for:

  • Air quality monitoring networks, including background sites
  • Special studies and supersites
  • Routine input for air quality index
  • Remediation projects (Superfund, hazardous waste)
  • Indoor air, exposure chamber, and industrial hygiene measurements
  • In and around industrial and material handling facilities
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.
Spare Parts
Purchase the most commonly ordered spare parts 24/7 via credit card.
(United States customers only)


Manuals & protocols