Casella GUARDIAN2 Online Dust and Noise Monitoring System

Overview

The Casella GUARDIAN2 Online Dust and Noise Monitoring System is an integrated, field-deployable environmental monitoring platform engineered for continuous, real-time assessment of airborne particulate matter (PM), acoustic noise, mechanical vibration, meteorological parameters, and volatile organic compounds (VOCs). Designed and manufactured in the United Kingdom, the GUARDIAN2 employs gravimetric-based optical detection for dust measurement—leveraging beta attenuation or laser scattering principles depending on configuration—and compliant microphone arrays calibrated to IEC 61672-1 Class 1 standards for acoustic quantification. Its architecture supports simultaneous multi-parameter acquisition across industrial perimeters, construction sites, urban roadside zones, landfill boundaries, and remediation projects where regulatory compliance, community impact assessment, and long-term trend analysis are mission-critical.

Key Features

• Multi-sensor fusion platform with synchronized time-stamped data acquisition across dust, noise, vibration, wind, temperature, humidity, and VOC channels
• Heated sampling inlet mitigates condensation-induced bias in high-humidity environments, ensuring stable PM mass concentration readings down to 1 µg/m³ detection limit
• Configurable particle size selection: TSP, PM₁₀, PM₂.₅, and respirable fraction (via optional cyclone or impactor modules)
• Triaxial geophone with 2–250 Hz operational bandwidth and 0.01 mm/s velocity resolution for structural and ground-borne vibration characterization
• Integrated anemometer and wind vane meeting WMO guidance for site-specific micro-meteorological context—wind speed accuracy ±2%, direction resolution 0.1°
• IP65-rated enclosure certified for outdoor deployment under extreme ambient conditions (−20°C to +50°C, 5–100% RH)
• Onboard flash memory with configurable logging intervals (1 sec to 1 hr); data export via GPRS, Ethernet, or USB

Sample Compatibility & Compliance

The GUARDIAN2 meets internationally recognized methodological and performance standards essential for regulatory reporting and audit readiness. Dust measurement protocols align with ISO 10178 (ambient air—determination of PM mass concentration) and EN 12341 (PM₁₀ and PM₂.₅ reference methods). Acoustic measurements conform to IEC 61672-1:2013 Class 1 specifications for sound level meters, supporting LA_eq, LA_max, percentile levels (LA_10%, LA_90%), and statistical noise descriptors required by EU Directive 2002/49/EC and local noise ordinances. Vibration outputs comply with ISO 2631-1 (human exposure to whole-body vibration) and ISO 5349 (hand-arm vibration). The system supports GLP-compliant data integrity through secure timestamping, calibration event logging, and tamper-evident firmware signatures.

Software & Data Management

Casella’s proprietary EnviroMonitor Suite provides web-based dashboard visualization, automated report generation (PDF/CSV), alarm threshold configuration (email/SMS alerts), and role-based user access control. All raw sensor data—including metadata such as calibration dates, sensor health status, and environmental compensation flags—are stored with cryptographic hashing to ensure traceability. Audit logs record every configuration change, data export, and remote firmware update—supporting 21 CFR Part 11-aligned electronic record requirements where applicable. Optional integration with third-party SCADA or GIS platforms is available via Modbus TCP or RESTful API.

Applications

• Construction site compliance monitoring (BS 5228-1:2014, ISO 14001 environmental management systems)
• Industrial fence-line monitoring for cement plants, quarries, biomass facilities, and waste transfer stations
• Urban air quality networks tracking PM and noise co-exposure patterns near schools, hospitals, and residential zones
• Post-remediation validation at brownfield sites requiring VOC and particulate baseline documentation
• Long-term environmental impact assessments (EIAs) mandated under national planning regulations
• Research-grade field studies investigating dose–response relationships between noise metrics and cardiovascular biomarkers

FAQ

What particle size fractions does the GUARDIAN2 measure by default?
The base configuration includes TSP and PM₁₀; PM₂.₅ and respirable dust require optional size-selective inlets installed during commissioning.
Is factory recalibration required annually?
Yes—Casella recommends annual traceable recalibration against NIST-traceable standards for dust and acoustic sensors; vibration and meteorological modules require biennial verification.
Can the system operate autonomously during grid outages?
Yes—hybrid power options include solar panel arrays with battery backup (minimum 72-hour runtime) and optional wind turbine integration.
Does the GUARDIAN2 support remote firmware updates?
Yes—secure over-the-air (OTA) updates are delivered via encrypted HTTPS channels with dual-signature validation.
How is data security enforced during GPRS transmission?
All telemetry uses TLS 1.2+ encryption; device authentication is managed via X.509 certificates pre-provisioned at manufacture.