BPIT, Inc. - Multi-Wavelength Thermal/Optical Carbon Analyzer - DRI 2015

Multi-Wavelength Thermal/Optical Carbon Analyzer - DRI 2015

By: Magee Scientific


It is the most advanced instrument in the world for the thermal analysis of the carbonaceous content of aerosol samples collected on filters.


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  • Compatible with EUSAAR2, IMPROVE_A, NIOSH 5040 or any other thermal protocol
  • Multi-wavelength measurement of transmission (T) and reflectance (R) intensities
  • Nondispersive infrared (NDIR) CO2 detector
  • Low helium gas consumption
  • Ergonomic engineering 

MEAUREMENT PRINCIPLE

Thermal/optical carbon analysis is based on the preferential oxidation of OC and EC materials under different temperatures and atmospheres. A ~0.5 cm2 punch from a particle-laden quartz fiber filter (or other sample form) is heated in programmed temperature steps. Organic compounds are liberated under a non-oxidizing helium atmosphere at lower temperatures up to 580 °C, while EC is combusted in an oxidizing atmosphere with 2% O2 at temperatures up to 840 °C. The liberated carbon is oxidized to carbon dioxide (CO2) by heated manganese dioxide (MnO2), and the CO2 is quantified by an NDIR detector. Seven modulated diode lasers measure the reflectance from, and transmittance through, each filter at wavelengths from 405 to 980 nm.

 

NOMINAL SPECIFICATIONS

Measurement Range: 0.05 to 750 µg carbon/cm2 (depending on carbonaceous composition) 

Minimum Detection Limit (MDL):

  • Total OC: 0.18± 0.06 µg C/cm2
  • Total EC: 0.04± 0.06 µg C/cm2
  • Total Carbon: 0.22± 0.06 µg C/cm2

Wavelengths:  405, 445, 532, 635, 780, 808, and 980 nm 

Support Gases:

  • Ultra-high purity (UHP) helium (hydrocarbon free, >99.999% purity)
  • 10% oxygen in UHP helium
  • 5% methane in UHP helium
  • Compressed air 

Data Reporting Interval: 1 second 

Software: LABVIEW-Based

 

ENVIRONMENTAL OPERATING CONDITIONS

Temperature: 10 to 35°C

Relative Humidity: 0 to 90%, noncondensing

 

OPERATING TEMPERATURES

Sample oven: programmable from 60 to 900 °C with maximum heating rate 250 °C/minute 

Oxidation oven: 900 °C 

Temperature accuracy: ±5 °C or 1%, whichever is greater

 

PHYSICAL SPECIFICATIONS

  • Dimensions: 44 x 92 x 41 cm (17 x 36 x 16 inch)
  • Weight: 23 kg (50 lbs)
  • Electrical Power supply: 100-240VAC, 50/60Hz
  • Power consumption: 1500 W maximum