ES-405 Simultaneous Particulate Profiler

Real-Time, Multi-Fraction Aerosol Monitoring for Industrial & Environmental Intelligence

The ES-405 Particulate Profiler by Met One Instruments is a robust, "near-reference" air quality sensor engineered to bridge the gap between regulatory-grade reference stations and low-cost sensors. Designed for continuous duty in demanding environments, the ES-405 utilizes advanced optical scattering technology to measure and report five particulate mass fractions simultaneously (PM1, PM2.5, PM4, PM10, and TSP).

Unlike standard optical particle counters that are prone to drift in heavy dust loading, the ES-405 features a purpose-built sheath air system. This aerodynamic design wraps the sample flow in clean air, keeping the internal optics protected from particulate deposition and significantly extending maintenance intervals. Equipped with an integrated inlet heater to mitigate humidity artifacts, the ES-405 delivers reliable, high-fidelity data for fenceline monitoring, industrial hygiene, and smart city networks.

Key Benefits

• Simultaneous Multi-Cut Analysis: Replaces multiple instruments by providing real-time data for PM1, PM2.5, PM4, PM10, and TSP in a single data stream, offering a complete profile of airborne particulate matter.

• Enhanced Optical Protection: The active sheath air system confines the sample stream, preventing dirty exhaust air and abrasive particles from contacting the laser optics or photodetector. This ensures long-term calibration stability and reduces sensor failure rates in high-pollution zones.

• Moisture Interference Rejection: An integrated, thermostatically controlled inlet heater conditions the sample air, preventing water vapor condensation and "fogging" errors that typically plague optical sensors in humid environments.

• Deployment Versatility: Housed in a rugged, weatherproof enclosure, the unit is ready for immediate wall or mast mounting. It transitions seamlessly between indoor industrial hygiene studies and outdoor environmental compliance monitoring.

Technical Overview

The ES-405 operates on the principle of right-angle laser light scattering. Ambient air is drawn into the system through a TSP inlet with a debris screen. Inside the sensing chamber, individual particles pass through a focused laser beam. The light scattered by each particle is collected by a high-speed photodetector and converted into electrical pulses. The amplitude of these pulses correlates to particle size, while the pulse frequency determines concentration.

Advanced Aerosol Conditioning:

To achieve "near-reference" data quality, the ES-405 employs a sophisticated flow control system. Roughly 40% of the intake air is filtered and recirculated as sheath air, encasing the remaining sample flow. This focusing effect aligns particles precisely through the laser's most sensitive zone (reducing coincidence errors) while creating a barrier that prevents optics fouling.

Connectivity & Integration:

The system is designed for straightforward integration into existing Data Acquisition Systems (DAS) or cloud platforms. With configurable sampling intervals (from 1 minute to 1 hour) and support for external meteorological sensors (wind speed/direction), the ES-405 acts as a comprehensive micro-station for local air quality analysis.

Typical Use Cases

• Construction & Fenceline Monitoring: Real-time tracking of fugitive dust emissions at site boundaries to ensure compliance with local nuisance dust regulations.

• Mining & Ore Processing: Monitoring respirable (PM4) and inhalable (PM10) dust near crushers and transfer points to protect worker health.

• Smart City Networks: Deploying dense grids of monitors to map urban pollution hotspots and validate traffic emission models.

• Emergency Response: Rapid deployment in wildfire zones or industrial accident perimeters to assess community exposure to smoke and hazardous plumes.

Why Choose This Analyzer?

The ES-405 distinguishes itself through reliability. In the realm of non-regulatory sensors, optical degradation is the primary cause of data loss. By incorporating sheath air technology—usually reserved for high-end research instruments—Met One has created a profiler that maintains accuracy where others fail. It offers facilities managers and environmental consultants a defensible data source that is significantly more affordable than a BAM or TEOM, yet far more durable and precise than consumer-grade IOT sensors.

Brand & Specifications

• Measured Components:

  PM1, PM2.5, PM4, PM10, TSP (Total Suspended Particulates).

• Applications:

  Fenceline monitoring, construction and remediation sites, open-pit mining, industrial hygiene, smart city grids, roadside pollution studies.

• Certifications:

  NIST Traceable Calibration; Manufactured in ISO-9001 facility; Performance verified by South Coast AQMD (AQ-SPEC) field evaluations.

• Measurement Principle:

  Right-angle Laser Light Scattering with Sheath Air Flow Protection.