Eco Sensors A-22 Portable Ozone Monitor

Overview

The Eco Sensors A-22 Portable Ozone Monitor is a field-deployable, microprocessor-controlled electrochemical gas analyzer engineered for real-time, quantitative measurement of ozone (O₃) concentration in ambient air and process streams. Designed around a diffusion-based, three-electrode electrochemical sensing principle, the A-22 delivers stable, low-drift response across two auto-switching ranges—0.030–1.999 ppm and 2.00–20.00 ppm—without manual range selection. Its core architecture integrates temperature and relative humidity compensation algorithms compliant with ISO 11358-1:2021 (gas analysis — calibration of gas analyzers — part 1: general principles), ensuring measurement integrity under variable environmental conditions typical of laboratory corridors, cleanroom support zones, pilot-scale oxidation reactors, and municipal water treatment control rooms. The instrument operates independently of external gas supplies or carrier gases, requiring only ambient sampling via integrated axial fan and PTFE-filtered inlet.

Key Features

• Pre-calibrated, plug-and-play electrochemical sensor module—no factory recalibration required; replacement takes <60 seconds without tools
• Real-time auto-ranging with seamless transition between low- and high-concentration measurement spans
• Dual-compensated measurement engine: integrated Pt1000 temperature sensor and capacitive RH sensor (0–95% non-condensing)
• Onboard data logger storing time-stamped instantaneous, minimum, maximum, and rolling 15-minute average values (capacity: 32,000 records)
• Multi-interface connectivity: USB-C for configuration and data export, isolated 0–20 mA current loop, and buffered 0–2 VDC analog output for PLC integration
• Robust portable form factor: IP54-rated enclosure, lithium-ion battery supporting 12 h continuous operation at 25 °C
• Firmware-upgradable via USB; supports user-defined alarm thresholds (audible + visual) and configurable averaging intervals (1 s to 60 s)

Sample Compatibility & Compliance

The A-22 is validated for use with dry and humidified air matrices containing ozone concentrations up to 20 ppm. It is not intended for direct measurement in corrosive gas streams (e.g., chlorine, nitrogen dioxide), high-particulate environments (>1 mg/m³), or saturated steam. All sensor modules are individually calibrated traceable to NIST-traceable ozone standards (SRM 2690b) and certified per ASTM D5012-22 (Standard Practice for Calibration of Ozone Monitors). Device firmware implements audit-trail logging for calibration events, sensor swaps, and parameter changes—supporting GLP-compliant documentation workflows. Electrical safety conforms to IEC 61010-1:2010; electromagnetic compatibility meets EN 61326-1:2013 Class A requirements.

Software & Data Management

Eco Sensors provides the free Windows-compatible A-22 Configuration & Data Manager software, enabling full instrument setup—including zero/span verification simulation, data export in CSV/Excel format, and graphical trend visualization. Raw logged data retains UTC timestamps synchronized via host PC clock on USB connection. For regulated environments, optional firmware upgrade enables 21 CFR Part 11-compliant user authentication (role-based access), electronic signatures, and immutable audit logs. The DL-3 external data logger (sold separately) extends storage capacity to 1 million records with SD card backup and programmable multi-channel synchronization (up to 4 A-22 units per DL-3 unit).

Applications

• Verification of ozone residual levels in pharmaceutical cleanroom HVAC ducts (ISO 14644-1 Class 5–8 environments)
• Monitoring ozone generator output stability during UV/O₃ advanced oxidation process (AOP) validation studies
• Occupational exposure assessment in industrial laundries and food surface disinfection facilities (per OSHA PEL: 0.1 ppm TWA)
• In-line ozone concentration tracking in municipal drinking water ozonation contact chambers (per EPA Guidance Manual for Ozonation)
• Calibration reference standard for benchtop UV photometers in analytical chemistry labs
• Field validation of ozone destruct unit efficiency in semiconductor fab exhaust abatement systems

FAQ

Does the A-22 require periodic factory recalibration?
No. The pre-calibrated sensor module is designed as a consumable with a guaranteed 36-month functional lifespan. Recalibration is performed at the module level prior to shipment; users replace the entire module—not individual electrodes.
Can the A-22 be powered continuously from a DC supply while operating?
Yes. When connected to a stable 12–24 VDC source, the internal battery enters float-charge mode, enabling indefinite operation without battery degradation.
Is the USB interface compatible with macOS or Linux?
The USB port functions as a virtual COM port. While native configuration software is Windows-only, third-party serial terminal applications (e.g., CoolTerm, Minicom) can read real-time ASCII data streams on macOS and Linux.
What is the recommended maintenance interval for the inlet filter?
The hydrophobic PTFE particulate filter should be inspected monthly and replaced every 6 months under typical indoor lab use, or more frequently in high-dust environments.
Does the A-22 support Modbus RTU or Ethernet communication?
No. Communication is limited to USB-C, 0–20 mA, and 0–2 VDC analog outputs. For Modbus integration, an external signal converter (e.g., Acromag 963EN) is required.