Aurora 2000 PM Correlation Nephelometer

The Aurora 2000 is part of the ‘new generation’ nephelometers using a single wavelength to measure aerosol light scattering and derive particulate concentrations. The Aurora 2000 is available in two configurations.
Configured with a PM2.5 Size Selective Inlet (SSI) to sample PM2.5, ideal in areas with stable aerosol chemistry Configured to communicate directly with a BAM1020, providing 1 minute PM corrected data, ideal in areas with multiple aerosol sources

Features

• New high powered LED light source increasing accuracy and reliability (red 635nm, blue 450nm, green 525nm)
• Compact and portable (light weight)
• Smart heater for controlling relative humidity of sampled air
  
• Reduced power consumption and a lower carbon footprint due to:
  • Low powered internal heater
  • New 12v power source
• Automated instrument calibration using zero and span gas
• Pressure and temperature reporting

Aurora 2000 PM_2.5 Nephelometer

The Aurora 2000 is available with automatic flow control and a PM2.5 Size Selective Inlet. This configuration improves the correlation between the Aurora 2000 and Federal Equivalent PM2.5 Methods.

This sampling method enables a manual correction factor to be entered in order to derive real time (1 minute) PM_2.5 concentrations. In applications where the aerosol chemistry is stable this configuration provides excellent results with minimal maintenance and a high degree of correlation.

The Aurora Nephelometer employs a smart heater controlled by a relative humidity sensor, this allows the user to set the maximum relative humidity of the sampled air, eliminating the influence of water vapour on the measurement and thus performing a “dry measurement”.

Aurora 2000 Automatic correlating PM nephelometer

In applications where aerosol chemistry is subject to change, a correction factor derived from manual sampling may be unreliable.

The Automatic correlation PM nephelometer connects directly to the Met One BAM1020 in order to monitor and log PM hourly averages generated by a BAM1020 (PM_BAM). These hourly averages are compared to the Aurora’s hourly average scattering coefficient (σ_scat) and a scattering to PM coefficient factor (Coef_Scat/PM) is calculated. This factor is then applied to the next hour of 1 min scattering coefficients measured in order to determine a 1 minute average for PM concentrations (PM_aurora). This data can also be used to determine changes in aerosol source through deviations in light scattering from the expected values.

Aurora 2000 nephelometer parameters:

• U.S. EPA compliance data for PM measurement
  
• Scattering coefficient (σ_scat)
• BAM1020 PM averages – 1 hour average only
• Corrected Real time 1 minute PM concentrations PM_aurora
• Sample Temperature, Relative Humidity and Barometric Pressure

It is also possible to perform basic source apportionment work using data generated by the Aurora Nephelometer as although the scattering coefficient to mass factor Coef_Scat/PM isn’t logged by the Aurora Nephelometer it is output from the Aurora’s RS232 port and can also be backward calculated by comparing PM_BAM with PM_aurora on an hourly basis.

A shift in this factor indicates that the aerosols chemistry has changed and for instance marine air is now being measured instead of urban air. This information can be useful in estimating the degree of harm that PM concentrations may cause to human health as urban air may pose significantly higher risks than marine air.

Specifications - Aurora 2000 PM correlation nephelometer

• Comm ports include
  • 4 analogue outputs (2 voltage & 2 current)
  • RS232 multidrop
  • RS232 serial port

Accessories - Aurora 2000 PM nephelometer

General Downloads

Brochure - Aurora 2000 PM corrrelation nephelometer

Customer Downloads (must be logged in)

Nephelometer downloader program