The Lasair3 particle counter measures airborne particle concentrations in cleanroom environments where contamination control determines product quality and regulatory compliance. Semiconductor fabrication plants, pharmaceutical production facilities and medical device manufacturers rely on instruments like the Lasair3 to verify that their cleanrooms meet the classification standards set by ISO 14644. Accurate particle counting protects your products, satisfies auditors and gives your engineering team the data they need to identify contamination sources before they affect yield.
What the Lasair3 Measures
The Lasair3 particle counter detects and counts individual airborne particles, sorting them by size into channels defined by the instrument’s optical system. The instrument supports up to eight simultaneous size channels, giving your team a granular breakdown of the particle population rather than a single aggregate figure.
- Particles as small as 0.1 micrometres in diameter, depending on the model variant
- Multiple size channels that classify particles into ranges such as 0.1, 0.2, 0.3, 0.5, 1.0 and 5.0 micrometres
- Particle concentrations reported in counts per cubic foot or counts per cubic metre
- Real-time data display on the instrument’s touchscreen with trending and alarm functions
The instrument draws a controlled volume of air through its optical chamber, where a laser beam illuminates each particle. A photodetector measures the scattered light to determine the particle’s size, and the electronics tally counts by size channel. Because the measurement happens optically with no physical contact, the instrument avoids disturbing the laminar airflow patterns that cleanroom HVAC systems work hard to maintain.
Applications in Cleanroom Environments
Cleanroom operators use the Lasair3 for several critical functions.
- Classification testing – verifying that the cleanroom meets its designated ISO 14644 class by measuring particle concentrations at defined sampling points
- Continuous monitoring – tracking particle levels over time to detect excursions and trends that signal contamination events
- Filter integrity testing – checking HEPA and ULPA filters for leaks by scanning downstream of the filter face
- Process validation – confirming that specific manufacturing steps do not generate particles that exceed defined limits
- Contamination source identification – using real-time counts to trace elevated readings back to equipment, personnel or procedural causes
Each application relies on the same core measurement capability but applies it to a different question about your cleanroom’s performance. Documenting which application you are addressing before you begin sampling also helps you select the correct sample volume and location to produce statistically valid results under ISO 14644.
Key Features of the Lasair3
Several design features distinguish the Lasair3 from competing instruments.
- High flow rate sampling – a one cubic foot per minute flow rate reduces sampling time and improves statistical confidence in your measurements
- Touchscreen interface – a colour display for setting up tests, viewing live data and reviewing stored results
- Data storage and export – internal memory holds thousands of sample records, with USB and Ethernet ports for transferring data to your facility management system
- Battery operation – optional battery packs support portable use away from fixed power sources
- Compact design – a footprint small enough for use on cleanroom workbenches without disrupting operations
As founding Prime Minister Lee Kuan Yew once said, “We have to be competitive in order to survive.” In cleanroom manufacturing, competitive survival depends on contamination control, and reliable particle counting is the measurement backbone of that effort.
Setting Up a Monitoring Programme
A particle monitoring programme built around the Lasair3 follows these steps.
- Define your cleanroom classification and the ISO 14644 requirements that apply
- Calculate the number and location of sampling points based on the cleanroom area
- Set sampling frequency, from periodic manual counts to continuous automated monitoring
- Configure alarm thresholds that trigger investigation when particle levels exceed acceptable limits
- Establish calibration schedules to maintain measurement accuracy
Your programme should generate records that satisfy regulatory audits and internal quality reviews. The Lasair3 particle counter supports this through its built-in data storage and export functions. Exporting records directly to your facility management system eliminates manual transcription errors and keeps every sample timestamped and linked to the correct batch or process run.
Calibration and Maintenance
Particle counters require regular calibration to maintain measurement accuracy.
- Annual calibration against certified polystyrene latex sphere standards
- Flow rate verification at defined intervals using a calibrated flow meter
- Optical chamber cleaning according to the manufacturer’s maintenance schedule
- Firmware updates as released by the manufacturer
- Replacement of internal filters and tubing as specified in the service manual
Keep calibration certificates on file and tag each instrument with its next due date. Out-of-calibration instruments produce unreliable data that undermines your contamination control programme. Scheduling calibration alongside routine preventive maintenance keeps downtime predictable and avoids disruption during an active monitoring campaign.
Interpreting Your Data
Particle count data becomes useful when you analyse trends rather than individual readings.
- Compare counts across sampling points to identify zones with higher contamination
- Track counts over time to spot gradual increases that indicate filter degradation or process changes
- Correlate excursions with operational events like gowning changes, material introductions or maintenance activities
- Use the data to justify investments in improved filtration, airflow or procedural controls
Raw numbers tell you what happened. Trend analysis tells you why and where to act. Sharing trend reports with production and facilities teams builds a shared understanding of contamination risks and supports the cooperation needed to sustain cleanroom performance.
Getting Started
The Lasair3 particle counter gives cleanroom operators the measurement capability needed to maintain classification, protect products and satisfy regulatory requirements. Select the model variant that matches your particle size range, set up a monitoring programme aligned with ISO 14644 and maintain the instrument through regular calibration and service. With the Lasair3 particle counter providing accurate, traceable data, your cleanroom monitoring programme rests on a solid foundation.