Ailun AL-6022 Direct-Reading Laser Light Scattering Dust Monitor

Overview

The Ailun AL-6022 Direct-Reading Laser Light Scattering Dust Monitor is a portable, real-time particulate matter (PM) concentration measurement instrument engineered for environmental air quality monitoring and occupational health surveillance. It operates on the principle of laser light scattering—where a collimated 650 nm diode laser beam interacts with airborne particles drawn through an optical sensing chamber via a precision-controlled pump-aspirated flow path. The intensity and angular distribution of scattered light are detected by a high-sensitivity photodiode array; particle mass concentration is derived using empirically validated Mie scattering algorithms calibrated against gravimetric reference methods per JJG 846–2015. Unlike passive filter-based samplers, the AL-6022 delivers immediate quantitative readouts of PM₂.₅, PM₁₀, and total suspended particulates (TSP) in mass concentration units (mg/m³), enabling rapid assessment of exposure levels in industrial workplaces, construction sites, municipal ambient monitoring networks, and indoor air quality studies.

Key Features

• Real-time, direct-reading output of PM₂.₅, PM₁₀, and TSP concentrations with 0.001 mg/m³ resolution and full-scale range up to 50 mg/m³
• Integrated brushless diaphragm pump ensuring stable 1.1 L/min volumetric flow rate over extended operation, minimizing flow-induced measurement drift
• Dynamic auto-zero compensation algorithm that continuously corrects for optical window contamination and baseline drift during field deployment
• Onboard rechargeable lithium-ion battery supporting ≥10 hours of continuous operation—ideal for unattended spot surveys or mobile monitoring campaigns
• Dual-mode data acquisition: time-weighted average (TWA) and short-term exposure limit (STEL) calculation compliant with OSHA and ACGIH guidelines
• LED display with intuitive menu navigation, supporting simultaneous visualization of current concentration, accumulated exposure time, and alarm status
• Configurable sampling interval (1–60 min) and data logging cycle, enabling adaptive duty-cycle optimization for long-term deployments

Sample Compatibility & Compliance

The AL-6022 is optimized for ambient and workplace air containing non-hygroscopic or moderately hygroscopic aerosols—including mineral dusts, cement powder, coal dust, wood sawdust, and metal fumes—within particle size distributions typical of PM₂.₅ to TSP. It is not intended for use in explosive atmospheres (ATEX/IECEx Zone 0–2) or highly corrosive gas environments. The instrument conforms to JJG 846–2015, the People’s Republic of China National Verification Regulation for Dust Concentration Meters, which defines metrological requirements including linearity, repeatability (≤10% coefficient of variation), and accuracy (±15% full-scale error). While not certified to ISO 12103-1 or EN 12341, its optical design and calibration traceability support alignment with ISO 7708 for particle size fraction definitions and ASTM D6245 for indoor air PM measurement protocols.

Software & Data Management

Data acquired by the AL-6022 is stored internally in non-volatile memory (1,800 records standard; 30 dedicated slots for occupational hygiene logging per shift). All records include timestamp, measured concentration, fractional designation (PM₂.₅/PM₁₀/TSP), and operational mode flags. Communication is supported via RS-232 serial interface (DB9) and native USB-C port—both compatible with Windows-based PC software for data export (CSV, TXT), curve plotting, and exposure report generation. Optional modules include 4–20 mA analog output for integration into SCADA systems, Bluetooth/Wi-Fi wireless transmission firmware (customizable per client specification), and thermal mini-printer interface for on-site hardcopy reporting. Firmware supports GLP-compliant audit trails when paired with host software featuring user access control and electronic signature capability.

Applications

• Occupational hygiene monitoring in mining, quarrying, foundries, and abrasive blasting operations per OSHA 1910.1000 and EU Directive 2004/37/EC
• Ambient air quality screening at construction perimeters, demolition sites, and road resurfacing zones
• Indoor air quality audits in schools, hospitals, and office buildings assessing infiltration of outdoor particulates
• Process validation and engineering controls verification during dust suppression system commissioning
• Educational laboratories for aerosol physics demonstrations and environmental science field exercises
• Regulatory compliance support for local environmental protection bureaus conducting routine emission source inspections

FAQ

Does the AL-6022 require periodic factory recalibration?
Yes. Annual recalibration against NIST-traceable gravimetric standards is recommended to maintain metrological integrity per JJG 846–2015 Clause 6.3. Field zero checks using clean air filters should be performed before each daily use.
Can the instrument differentiate between organic and inorganic particulates?
No. The AL-6022 reports total mass concentration based on light scattering cross-section and assumed particle density (default 1.0 g/cm³). Composition-specific identification requires complementary techniques such as SEM-EDS or XRF.
Is the device suitable for outdoor continuous monitoring in rain or high humidity?
It is rated for storage at ≤85% RH (non-condensing), but prolonged exposure to precipitation or fog may compromise optical window clarity and pump performance. Use with weatherproof enclosure and inlet heater is advised for unsheltered deployments.
What is the expected service life of the laser diode and photodetector assembly?
The 650 nm laser diode has a rated lifetime of >10,000 hours under nominal operating conditions; the silicon photodiode exhibits negligible aging over five years of typical field use.
Does the AL-6022 comply with FDA 21 CFR Part 11 for electronic records?
The standalone unit does not implement Part 11 controls (e.g., electronic signatures, audit trails); however, when connected to validated third-party data acquisition software with role-based access and immutable log files, it may be incorporated into Part 11–compliant workflows.