Aurora 2000

PM2.5 Correlating Nephelometer

The Aurora 2000 PM_2.5 Correlating Nephelometer is part of the ‘new generation’ nephelometers using a single wavelength and an BETA monitor to measure aerosol light scattering and derive particulate concentrations.

The Aurora 2000 enables the calculation of a correlation factor based on a PM_2.5 reference method which is then used to derive every minute a PM_2.5 concentrations along with the usual light scattering. The correction factor can be entered manually or automatically derived from hourly averages from a continuous PM_2.5 monitor.

Features

Auto calibration

Simplified automatic calibration using internal valves, ideal for remote locations

Fully integrated package including:

internal sample pump, sample heater, internal calibration valves, zero air pump & data logger

Internal sample heater

Internal sample heater with temperature or RH control, which can be enabled by the user to eliminate the effects of humidity (RH: < 30 to < 90 % )

Energy

12 VDC operation (45 W max, 13 W nominal)

Remote controle

Remote control through serial interface

See our technology in action

Schedule a free demo to get a first-hand look at how our solutions support your business.

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Resources

Aurora Nephelometer Range
Brochure

Aurora 2000
Technical Specifications

Aurora 2000
Manual

Dust Monitoring Ready Reference Selection Tool

Light Source

The Aurora 2000 can be equipped with any one of the following LED light sources:

450 nm (blue) for fine & ultra fine particulates (wood fires, automobiles)
525 nm (green) for visibility
635 nm (red) for large particulates (e.g. pollen).

Configurations

Aurora 2000 PM2.5 Nephelometer — manual correction factor configuration
In applications where the aerosol chemistry is stable, a correction factor can be manually entered which then provides excellent results with minimal maintenance and a high degree of correlation.

Aurora 2000 automatic correlating PM nephelometer configuration

In applications where aerosol chemistry is subject to change, a correction factor derived from manual sampling may be unreliable. In this case the Aurora 2000 may be connected directly to a PM2.5 compliance monitor, either the Acoem Spirant BAM or the Met One BAM 1020, in order to monitor and log PM hourly averages generated by the BAM (PM_BAM). These hourly averages are compared to the Aurora’s hourly average scattering coefficient (σ_scat) and a scattering to PM coefficient factor (σ_scat/PM) is calculated.

This factor is then applied to the next hour of 1 minute scattering coefficients measured in order to determine a 1 minute average for PM concentrations (PM_aurora).

The derived correction factor can also be used to determine changes in aerosol sources through deviations in light scattering from the expected values.

This configuration of the Aurora 2000 nephelometer provides the following parameters:

US EPA compliance data for PM2.5 measurement
Scattering coefficient (σscat)
BAMPM averages – 1 hour average only
Corrected real time 1 minute PM concentrations PMaurora
Sample temperature, relative humidity & barometric pressure.

Communications & Data storage

Outputs:
- 25 pin external I/O analog outputs (2 voltage & 2 current)
- 2 x RS232 serial ports (multi-drop, service)
Filtering: Kalman (digital adaptive filter), moving average (30 seconds) & no filter
Stored parameters: Date & time, µg/m3, σsp (635, 525 or 450 nm), hourly BAM PM average, hourly mass correction factor,
sample air temperature, enclosure temperature, RH & barometric pressure & instrument status
Capacity: Maximum of 48 days of 5 minute averages, or 10 days of 1 minute averaged data.