MIRA PICO ETO Portable Ultra-Sensitive Ethylene Oxide Analyzer

Overview

The MIRA PICO ETO is a field-deployable, battery-powered trace gas analyzer engineered for real-time, ultra-sensitive detection of ethylene oxide (EtO) in ambient air and emission plumes. It employs tunable diode laser absorption spectroscopy (TDLAS) in the mid-infrared (MIR) spectral region—leveraging the strong, molecule-specific fundamental vibrational absorption bands of EtO near 3.4 µm. Unlike near-infrared (NIR) systems that rely on weaker overtone transitions, the MIRA PICO ETO achieves exceptional specificity and sensitivity by targeting EtO’s intrinsic “fingerprint” absorption features, enabling unambiguous identification even in complex matrix gases. Its optical architecture integrates Aeris Technologies’ proprietary folded-path multi-pass absorption cell (60 mL volume, >13 m effective path length) with a monolithic, hermetically sealed optical bench—eliminating alignment drift, high-reflectivity mirrors, and susceptibility to particulate contamination. The system operates at 1 kHz laser scan rate and simultaneously quantifies both EtO and water vapor, supporting dry-mole-fraction reporting for regulatory compliance and atmospheric modeling.

Key Features

• Sub-part-per-trillion (ppt) detection limit: 500 ppt/s noise-equivalent concentration (NEC) with signal averaging; <1 ppb per 30-second cycle accuracy in auto-differential zeroing mode
• Real-time measurement at user-selectable 1 Hz or 2 Hz data update rates
• Integrated sampling pump and dual programmable inlet ports—enabling true differential measurement using an external scrubber or zero-gas filter to suppress baseline drift
• Ultra-low power consumption: 15 W nominal; internal rechargeable battery supports up to 6 hours of continuous operation
• Compact footprint: 14.5″ W × 12″ D × 7″ H; total mass 2.75 kg including battery and pump
• Onboard GPS module (optional) logs georeferenced concentration data in .kml format for visualization in Google Earth or GIS platforms
• Embedded Wi-Fi, USB, RS-232, and optional 4–20 mA analog output for integration into SCADA, data loggers, or mobile monitoring platforms
• 32 GB internal flash memory (expandable); firmware supports customizable calibration interval scheduling and automated zero-check routines

Sample Compatibility & Compliance

The MIRA PICO ETO is validated for direct analysis of ambient air, stack effluents, indoor workplace environments, and fugitive emission plumes without pre-concentration or chemical derivatization. Its MIR-TDLAS methodology delivers linear response across a dynamic range of 40 ppt to 100 ppm EtO—ensuring fidelity from background environmental levels to occupational exposure limits (e.g., OSHA PEL = 1 ppm TWA). The analyzer meets critical requirements for environmental monitoring under U.S. EPA Method TO-15 principles (though not formally certified as a TO-15 instrument), and its trace-level performance aligns with emerging regulatory expectations for EtO emissions tracking, particularly following EPA’s 2023 Integrated Risk Information System (IRIS) assessment classifying EtO as a known human carcinogen. Data integrity is supported by audit-ready timestamping, metadata tagging (temperature, RH, pressure), and optional 21 CFR Part 11-compliant software modules for GLP/GMP-aligned laboratories.

Software & Data Management

The MIRA PICO ETO runs on embedded Linux with a web-based GUI accessible via any Wi-Fi-connected device (laptop, tablet, smartphone). Configuration, real-time plotting, alarm thresholds, and calibration logs are managed through a secure HTTPS interface. Raw spectral data and processed concentration time-series are stored in standardized CSV and NetCDF formats. Geotagged datasets export natively to .kml for spatial analysis. Remote firmware updates, over-the-air diagnostics, and scheduled zero/calibration events are configurable via the onboard scheduler. For enterprise deployment, the system supports MQTT and Modbus TCP protocols for seamless integration into centralized environmental data management systems (EDMS) and cloud-based analytics platforms.

Applications

• Regulatory compliance monitoring at medical sterilization facilities (FDA-regulated sites)
• Fugitive emission surveys around EtO storage tanks, transfer lines, and vapor recovery units
• Mobile fence-line monitoring using vehicle-mounted or drone-integrated configurations
• Workplace exposure assessment in pharmaceutical manufacturing and laboratory settings
• Background EtO mapping in communities adjacent to industrial corridors
• Method validation and reference measurements for sorbent tube–based GC/MS workflows

FAQ

What is the detection principle used in the MIRA PICO ETO?
It uses tunable diode laser absorption spectroscopy (TDLAS) in the mid-infrared (MIR) region, targeting EtO’s fundamental vibrational absorption band near 3.4 µm.
Does the instrument require external calibration gases?
No—zero calibration is performed automatically using the dual-port differential configuration; span calibration may be performed optionally with certified EtO standards.
Can the MIRA PICO ETO operate unattended for extended periods?
Yes—when powered externally (12–15 V DC or 110–220 V AC), it supports continuous logging with 32 GB onboard memory and remote access via Wi-Fi or Ethernet.
Is the system compatible with EPA or ISO regulatory reporting frameworks?
While not EPA-certified as a reference method, its performance characteristics meet or exceed requirements for supplemental monitoring under EPA’s Emissions Monitoring Strategy (EMS) and support ISO 14001 environmental management system verification.
How is humidity interference corrected during measurement?
The system co-measures water vapor absorption in the same spectral window and applies real-time correction to report dry-mole-fraction EtO concentration.