Where Beta Attenuation Fits in Australian Monitoring Networks
Tapered Element Oscillating Microbalance (TEOM) technology has been an approved and widely deployed method for particulate monitoring for decades. It remains a recognised method. What has changed is its trajectory: with the manufacturer withdrawing from the market, the ecosystem of parts, consumables and certified service support will contract over time. For operators managing long-term compliance programs, that trajectory matters as much as current performance.
Beta attenuation mass (BAM) monitoring has, over the same period, become the reference method of choice across Australian regulatory and industrial monitoring networks for PM2.5 and PM10. Its adoption reflects practical performance advantages in real-world field conditions.
Beta attenuation instruments measure particulate mass without the aggressive sample heating that oscillating microbalance technology requires to manage moisture. That heating process can affect certain particulate compounds, introducing measurement variability that operators then need to account for. Beta attenuation avoids this, producing data that more closely reflects true mass concentration and that remains consistent across varying atmospheric conditions.
The result is cleaner, more repeatable data across varying field conditions. For Australian operators who need their compliance data to hold up under regulatory scrutiny, that consistency is the point.
The BAM 1020, BAM 1022, BAM 1022 Plus and E-BAM Plus from Acoem all deliver Australian Standard hourly data, and are capable of monitoring across PM2.5 and PM10 fractions depending on the model selected.
The BAM 1020: The Established Instrument for Regulatory and Industrial Networks
The BAM 1020 is the instrument that environmental regulators and industrial operators across Western Australia and other states have standardised on for Australian Standard PM2.5 and PM10 monitoring.
Its track record in government and industry monitoring networks is long, and it carries extensive international certification alongside its compliance credentials.
For operators who also need sub-hourly data, the BAM 1020 is paired with an Acoem real-time monitor for reliable real-time 5 or 10-minute readings.
This is worth understanding clearly: the BAM 1020 provides the compliance-grade hourly data; the companion sensor provides the real-time visibility layer. That companion data is then correlated against the BAM’s hourly output, giving operators both reference-grade compliance data and near-real-time awareness of particulate levels between measurement cycles.
One practical consideration for site planning: the BAM 1020 requires AC power and a shelter or enclosure. For remote or off-grid sites, this is a factor worth working through with Acoem’s team early in the transition process.
The BAM 1022 and BAM 1022 Plus: Self-Contained PM2.5 Monitoring with Integrated Real-Time Output
For operators who need Australian StandardPM2.5 data with no requirement for a shelter or enclosure, the BAM 1022 and BAM 1022 Plus are both self-contained weatherproof instruments. Unlike the BAM 1020, they do not need a companion sensor to provide real-time data. Both units deliver simultaneous hourly and real-time output in a single instrument.
The BAM 1022 measures PM2.5 under near-ambient conditions, which minimises error from semi-volatile particulate loss without requiring Nafion dryers. This reduces both operating cost and routine service complexity compared to instruments that rely on temperature-controlled shelter environments.
The BAM 1022 Plus builds on this with a more sensitive detection system, delivering approximately double the sensitivity of the standard BAM 1022. Its lower detection limit makes it well-suited to monitoring networks where detecting lower concentrations of PM2.5 is required and tightening standards demand more precise measurement. It provides hourly Australian Standard PM2.5 data, along with real-time output at 1-minute resolution.
The E-BAM Plus: Portable Australian Standard-Compliant Monitoring
Not every monitoring requirement is permanent. Emergency response, temporary fence-line monitoring, and supplementary network coverage all call for an instrument that can be deployed quickly and repositioned when a site’s needs change.
The E-BAM Plus provides Australian Standard hourly data alongside indicative real-time output in a portable, self-contained weatherproof unit that requires no shelter.
It can be operational in approximately 15 minutes, operates on AC power or 12V DC, and is designed for field conditions where rapid deployment matters. For operators managing a mix of fixed and temporary monitoring requirements, the E-BAM Plus offers a consistent measurement method across both.
The OPX 1025: Real-Time Optical Monitoring as a Complement to BAM
For operators who want more than hourly compliance data, the OPX 1025 adds a real-time awareness layer that BAM instruments are not designed to provide on their own.
The OPX 1025 is an optical PM mass monitor that uses a polychromatic light source and broadband particle spectrometry to measure PM1, PM2.5, PM4, PM10 and PM10-2.5 simultaneously, updating every 10 seconds. Where a BAM gives you the reference-grade hourly data your licence requires, the OPX 1025 tells you what is happening on site in near real time, giving operators the ability to respond to a dust event as it develops, rather than after the fact.
The technology behind it is meaningfully different from conventional optical monitors. The OPX 1025 uses Acoem’s proprietary RealPM algorithm, a size and density mass conversion system that automatically adjusts for changing environmental conditions including humidity and temperature.
This matters in Australian field conditions, where ambient variability can affect the accuracy of optical measurements. The instrument’s lower detectable limit is less than 0.1 μg/m³, and it requires no filter tape, meaning consumable costs and maintenance intervals are both significantly lower than for tape-based instruments.
In practical terms, the OPX 1025 suits fence-line and perimeter monitoring, construction and mine site dust control, community monitoring programs, and any application where operators need continuous particulate awareness rather than hourly compliance snapshots. It is not a replacement for BAM in regulatory compliance contexts, it is the instrument you run alongside your BAM to give your team the real-time visibility that compliance monitoring alone cannot provide.
What your Transition Decision Should Account For
When evaluating a replacement for legacy particulate monitors, the following questions are worth working through with your Acoem representative:
- Which Australian Standard-compliant PM fractions does your licence or regulatory obligation require? PM2.5, PM10, or both?
- Does your site have existing shelter or enclosure infrastructure, or does the instrument need to be self-contained?
- What is your power situation, AC mains or Solar (DC), and which instruments suit your site configuration?
- Do you need sub-hourly real-time data alongside compliance-grade hourly output, and if so, which configuration is appropriate?
- Is there value in adding a real-time optical layer for operational awareness, fence-line monitoring or community reporting alongside your compliance instrumentation?
- What local service and calibration support is available, and what are the turnaround times for your instruments?
When it comes to calibration, Acoem’s Service & Calibration Centre provides NATA-accredited calibration for ambient air monitoring equipment, including the BAM series, backed by local technical support across Australia.
For operators managing EPA licence obligations or audit requirements, having both accredited instrumentation and accredited local calibration service under one accountable partner removes a significant source of risk from the transition process.
Next Steps
If you are currently operating legacy particulate monitors and need to plan a transition, Acoem’s air quality team can assist with product selection, site assessment and transition planning.
