YESAIR 8-Channel Portable Multi-Gas Monitor

Overview

The YESAIR 8-Channel Portable Multi-Gas Monitor is an engineered solution for real-time, simultaneous monitoring of indoor air quality (IAQ) and occupational environmental parameters. Developed by CET Instruments (Canada), this modular platform operates on a configurable 8-channel architecture that supports concurrent measurement of temperature, relative humidity, carbon dioxide (CO₂), carbon monoxide (CO), volatile organic compounds (VOCs), toxic gases (e.g., H₂S, NO₂, Cl₂, HF, NH₃), combustible gases (LEL), and airborne particulate matter (PM). Its core operational principle integrates electrochemical sensing (for ppb–ppm toxic gases), non-dispersive infrared (NDIR) detection (for CO₂), photoionization detection (PID) for broad-spectrum VOCs, and optical particle counting (OPC) for 0.3–10 µm aerosols—all synchronized via a high-resolution 12-bit analog-to-digital acquisition system. Designed for field-deployable compliance with ISO 16000-23 (indoor air—determination of VOCs), ASTM D6196 (selection of sorbents), and OSHA PEL/ACGIH TLV reference frameworks, the YESAIR serves as a primary data acquisition node in IAQ audits, industrial hygiene surveys, building commissioning, and post-remediation verification.

Key Features

• Modular 8-channel sensor interface: Channels 1–2 factory-configured for temperature and RH; channels 3–4 support up to two high-current sensors (e.g., NDIR CO₂, PID, or catalytic LEL); channels 5–7 accept up to three standard electrochemical toxic gas sensors; channel 8 dedicated to optical particle counter integration.
• Backlit multiline alphanumeric LCD display with scrollable interface—simultaneously visualizes all active sensor IDs, real-time readings, battery status, SD card recording indicator, and alarm activation flags.
• Programmable per-gas alarm thresholds: Users define upper/lower limits for each monitored species; triggering activates internal 80 dB audible buzzer (EN 61000-4-2 compliant) and visual alert on display.
• UL94-V0 flame-retardant ABS enclosure with rotating ergonomic handle—enables handheld operation, tripod mounting, or benchtop stabilization without additional fixtures.
• Integrated active sampling pump with flow regulation ensures consistent sample draw across all connected sensors, minimizing cross-channel interference and improving time-resolved reproducibility.
• Onboard data logging capacity exceeds 1 million timestamped records stored on removable SD card (sold separately as YES Data Logging Kit); micro-USB port enables firmware updates, configuration editing, and bulk data export.

Sample Compatibility & Compliance

The YESAIR accommodates over 30 plug-and-play sensor modules certified to international performance standards including IEC 60079-29-1 (gas detectors), EN 45544-1 (electrochemical sensors), and ISO 29463-3 (particle counters). Sensor interchangeability allows rapid reconfiguration between HVAC commissioning (CO₂ + RH + temp), confined space entry (O₂ + H₂S + LEL), or laboratory fume hood validation (CO + NO₂ + VOC). All measurements comply with GLP-aligned traceability requirements: instrument ID, sensor serial numbers, calibration dates, and operator tags are embedded in each logged record. The system supports audit-ready metadata tagging and meets FDA 21 CFR Part 11 readiness when used with YES Viewer PC software configured for electronic signatures and change control logs.

Software & Data Management

YES Viewer PC is a Windows-based desktop application designed for post-acquisition analysis and regulatory reporting. It directly mounts SD card contents or imports USB-downloaded datasets, enabling synchronized multi-parameter time-series visualization, statistical summary generation (min/max/mean/stdev), and customizable report templates compliant with ISO 17025 documentation practices. Data export options include CSV (for LIMS integration), PDF (for client deliverables), and XML (for enterprise EHS platforms). Version-controlled firmware updates, sensor calibration certificate import, and user-access-level management (admin/operator modes) ensure long-term maintainability and data integrity across deployment cycles.

Applications

• Indoor Air Quality Assessment: Simultaneous tracking of CO₂ (ventilation efficacy), CO (combustion appliance safety), TVOC (off-gassing from furnishings), and PM₂.₅/PM₁₀ (filtration efficiency verification) per ASHRAE Standard 62.1.
• Occupational Health Monitoring: Real-time exposure assessment against OSHA PELs and ACGIH TLVs during maintenance, painting, solvent handling, or wastewater treatment operations.
• Building Commissioning & Retro-Commissioning: Validation of HVAC control logic, demand-controlled ventilation response, and filtration system performance under dynamic load conditions.
• Emergency Response & Hazmat Screening: Rapid identification of chemical releases (e.g., chlorine in water treatment plants, HF in semiconductor fabs) using pre-loaded toxic gas sensor arrays.
• Academic & Research Field Studies: Long-duration unattended logging in schools, museums, or historic buildings where passive diffusion samplers lack temporal resolution.

FAQ

What sensor types are supported out-of-the-box?
Temperature and relative humidity sensors are included. All other sensors—including NDIR CO₂, electrochemical CO/H₂S/NO₂/O₃, PID for TVOC, and optical particle counters—are optional and selected based on application requirements.
Is calibration traceable to NIST or equivalent national standards?
Yes—each certified sensor module ships with a factory calibration certificate referencing NIST-traceable gas standards or accredited reference materials per ISO/IEC 17025.
Can the YESAIR operate continuously on AC power while logging?
Yes—the instrument accepts external 12 V DC input via the auxiliary power port, enabling uninterrupted operation and battery preservation during extended stationary deployments.
How is data security maintained during transfer and storage?
Data files are write-protected upon SD card insertion; YES Viewer enforces role-based access control and generates immutable audit trails for all configuration changes and report exports.
Does the system support wireless telemetry or cloud connectivity?
No native Wi-Fi or cellular module is integrated; however, third-party gateways may interface via USB-serial emulation for SCADA or IoT platform ingestion, subject to site-specific cybersecurity policies.