Lighthouse Handheld Laser Particle Counter Series – Model 3886

Overview

The Lighthouse Model 3886 Handheld Laser Particle Counter is an ISO-compliant, portable airborne particle monitoring instrument engineered for precision environmental monitoring in cleanrooms, pharmaceutical manufacturing suites, hospital isolation rooms, and HVAC validation environments. Utilizing a high-stability laser diode light source and calibrated optical detection geometry, the device measures particle concentration across five discrete size channels—0.3, 0.5, 1.0, 3.0, and 5.0 µm—based on Mie scattering principles. Its 2.83 L/min (0.1 cfm) volumetric flow rate is actively regulated by an integrated thermal mass flow sensor, ensuring measurement repeatability within ±5% at challenge concentrations up to 2 million particles per cubic foot. Designed for field-deployable operation, the unit meets the physical and metrological requirements of ISO 14644-1 Class 3–8 cleanroom verification and aligns with US Federal Standard FS-209E equivalency protocols.

Key Features

• Simultaneous real-time measurement of airborne particle counts, ambient temperature, relative humidity, and air velocity—when equipped with optional probes (Model 0842 temperature/humidity probe and Model 0843 anemometer)
• Programmable sampling parameters: user-defined sampling duration (1 sec–99:59), number of cycles (1–99 or continuous), and inter-sample delay intervals to eliminate operator-induced bias
• Onboard data logging capacity of 500 records; in “Calculate” mode, each sampling event stores four derived values (e.g., mean, max, min, standard deviation)
• Dual communication interface: RS-232C for PC connectivity and RS-485 for multi-unit daisy-chained monitoring networks—enabling scalable deployment across distributed clean zones
• Robust mechanical architecture: compact form factor (115 × 70 × 211 mm), lightweight design (980 g body weight), and ruggedized casing suitable for repeated transport and field use
• Comprehensive diagnostics: automatic fault detection for over-range counting, laser output degradation, flow deviation beyond ±10%, and low-battery state—with clear LCD error codes

Sample Compatibility & Compliance

The Model 3886 is validated for use with standard isokinetic sampling probes and inlet tubing conforming to ISO 21501-4 specifications. Its counting efficiency adheres to JIS B9921 for 0.3 µm particles (50% ±10%) and achieves >98% efficiency at ≥0.5 µm. Zero-count performance meets JIS B9921 limits (<1 count/ft³ for ≥0.3 µm). Calibration traceability follows NIST-traceable reference aerosols (e.g., PSL spheres), with documented uncertainty budgets available upon request. The instrument satisfies regulatory expectations for environmental monitoring under FDA 21 CFR Part 11 when paired with compliant software (e.g., Lighthouse LogTrack™ with audit trail and electronic signature support). It supports GLP/GMP-aligned workflows through configurable user access levels, timestamped data logs, and exportable CSV/Excel reports.

Software & Data Management

Data acquisition and reporting are supported via Lighthouse’s proprietary LogTrack™ desktop application (Windows-compatible), which enables remote configuration, real-time streaming, historical trend analysis, and automated report generation compliant with ISO 14644-2 Annex B templates. Raw data exports include full metadata: date/time stamp, location ID, operator ID, sampling parameters, environmental sensor readings, and calibration status flags. When connected to an RS-232 printer (optional), the device generates hard-copy reports with embedded test parameters and pass/fail indicators against user-defined ISO class thresholds. All stored records retain immutable timestamps and cannot be edited post-acquisition—ensuring data integrity for internal audits and regulatory inspections.

Applications

• Cleanroom certification and routine monitoring per ISO 14644-1 and EU GMP Annex 1 requirements
• Filter integrity testing (e.g., HEPA/ULPA upstream/downstream challenge assessments)
• HVAC system commissioning, balancing, and requalification
• Pharmaceutical aseptic processing environment qualification (Grade A/B/C/D)
• Medical device packaging clean area surveillance
• Research laboratory contamination control and process troubleshooting

FAQ

Does the Model 3886 require annual recalibration?
Yes—Lighthouse recommends annual calibration using NIST-traceable PSL standards in accordance with ISO/IEC 17025 accredited procedures. Certificate of calibration includes as-found/as-left data and measurement uncertainty statements.

Can the device operate while charging?
No—the internal Ni-MH battery pack must be removed and charged externally using the supplied dedicated charger; AC adapter powers the unit only during operation, not battery charging.

Is the RS-485 daisy-chain topology compatible with Modbus RTU protocol?
No—the RS-485 interface implements Lighthouse’s proprietary command set; Modbus integration requires middleware translation via third-party gateway devices.

What is the maximum allowable particulate concentration before coincidence loss affects accuracy?
Concentration linearity remains within ±5% up to 2,000,000 particles/ft³ for the 0.3 µm channel; higher concentrations necessitate dilution sampling or alternative instrumentation.

Are temperature and humidity measurements traceable to national standards?
Yes—optional Model 0842 probe carries individual calibration certificates traceable to NIST, with uncertainties stated per ISO/IEC 17025 for temperature (±0.5 °C) and RH (±3% RH in 30–85% range).