Met One ES-642 Remote Dust Monitor

Industrial-Grade Real-Time Particulate Profiler for Harsh Environments

The Met One ES-642 is a ruggedized, highly sensitive remote dust monitor engineered for continuous industrial and environmental surveillance. Designed to operate reliably in the most adverse field conditions, this instrument utilizes advanced forward light scatter laser nephelometry to deliver real-time measurements of particulate matter concentrations ranging from 0 to 100 mg/m³.

Ideally suited for fenceline monitoring, remediation sites, and mining operations, the ES-642 solves the two most common failure points in optical monitoring: lens fouling and humidity interference. By integrating an automatic purge air system and a smart inlet heater, the ES-642 ensures data integrity without the need for frequent maintenance trips, making it the definitive "set-and-forget" solution for remote compliance monitoring.

Key Benefits

• Immunity to Humidity: The controlled inlet heater actively reduces moisture content in the sample air, preventing water vapor from being misread as solid particles—a critical feature for outdoor deployment in foggy or humid climates.

• Zero-Drift Stability: An automatic zero-calibration cycle is performed every hour, physically re-zeroing the sensor against clean air to eliminate long-term drift and ensure baseline accuracy.

• Maintenance-Free Optics: The proprietary sheath air (purge air) system creates a clean air curtain around the optical components, preventing heavy dust loading and sensor fouling even in high-concentration environments like quarries or demolition sites.

• Versatile Connectivity: Built for integration, the system offers simultaneous analog outputs (0–10V, 4–20 mA) and serial communications (RS-232, RS-485 via Modbus or ASCII), ensuring seamless compatibility with any standard data logger or PLC.

Technical Overview

The ES-642 operates on the principle of Forward Light Scatter Laser Nephelometry. As ambient air is drawn into the measurement chamber, particles pass through a focused laser beam. The light scattered by these particles is detected by a high-sensitivity photodiode, with the intensity of the scatter directly proportional to the mass concentration of the aerosol.

Measurement Flexibility:

Out of the box, the unit measures Total Suspended Particulates (TSP). However, it can be easily configured for regulatory fractions by attaching optional sharp-cut cyclones:

• PM10 (Inhalable particles)

• PM2.5 (Respirable particles)

• PM1 (Ultra-fine particles)

Robust Enclosure:

The measurement engine is housed in a weatherproof, industrial-grade enclosure designed to withstand extreme temperatures and physical ingress, ensuring consistent operation in dusty, wet, or corrosive atmospheres.

Typical Use Cases

• Construction & Demolition: Real-time fenceline monitoring to ensure compliance with local dust ordinances and protect neighboring communities.

• Mining & Ore Processing: Monitoring fugitive dust emissions from crushing, conveying, and blasting operations.

• Remediation Sites: Safety monitoring during soil excavation or hazardous waste cleanup to detect sudden releases of particulate matter.

• Smart Cities & HVAC: Deployment in urban infrastructure or building automation systems to trigger ventilation protocols based on air quality spikes.

Why Choose This Analyzer?

The Met One ES-642 distinguishes itself through reliability. While many optical monitors fail after days of exposure to heavy industrial dust, the ES-642's sheath air system keeps it running for months. It bridges the gap between expensive federal reference method (FRM) analyzers and low-cost sensors, providing a high-accuracy, legally defensible data stream at a fraction of the lifecycle cost. It is the pragmatic choice for EHS managers who need valid data without the burden of daily calibration.

Specifications

• Measured Components:

  TSP (Standard); PM10, PM2.5, PM1 (with optional sharp-cut cyclones).

• Applications:

  Fenceline monitoring, mining, construction sites, industrial hygiene, tunnel ventilation control, emergency response.

• Certifications:

  MCERTS Indicative (Check local model availability); CE Marked; Designed to meet industrial durability standards.

• Measurement Principle:

  Forward Light Scatter Laser Nephelometer with active sheath air and automatic zeroing.