Foxsense MULTi 2000 Plus Dual-Channel Online Multicomponent Gas Analyzer

Overview

The Foxsense MULTi 2000 Plus is a dual-channel, rack-mounted multicomponent gas analyzer engineered for continuous, real-time measurement of up to four key gases—methane (CH₄), carbon dioxide (CO₂), carbon monoxide (CO), and oxygen (O₂)—in demanding industrial and environmental monitoring applications. Unlike single-gas detectors or generic NDIR-based analyzers, the MULTi 2000 Plus integrates multiple sensor technologies—including non-dispersive infrared (NDIR) for CH₄ and CO₂, electrochemical cells for CO and O₂, and temperature/pressure compensation circuitry—to deliver stable, cross-interference-minimized readings under variable sample conditions. Its modular architecture supports either single- or dual-channel operation, enabling simultaneous analysis of two independent gas streams—for instance, raw biogas inlet and upgraded biomethane outlet in anaerobic digestion plants. The analyzer operates on a continuous flow-through principle, requiring no consumables or reagents, and is calibrated for long-term stability in ambient temperatures ranging from 0 °C to 45 °C and relative humidity up to 90% non-condensing.

Key Features

• Dual-channel capability: Independent sampling inlets and dedicated sensor modules per channel ensure true parallel analysis without time multiplexing or signal switching delays.
• Rack-mount form factor: Compliant with 19-inch 3U mechanical standard (IEC 60297-3-100); available in IP20 (unenclosed rack unit) and IP52 (fully enclosed, dust-protected cabinet) configurations.
• Modular gas conditioning: Optional pre-installed particulate filters, coalescing filters, and inline flow meters allow customization for wet, dusty, or high-flow biogas streams.
• Real-time response: T90 response time ≤30 seconds across all target analytes, validated per ISO 12039 for methane and ISO 20030 for CO₂ in biogas matrices.
• Embedded diagnostics: Self-monitoring firmware tracks sensor health, zero drift, span stability, and flow integrity; alerts via relay outputs or Modbus RTU/ASCII.
• Robust EMC design: Complies with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emission) standards for installation in electrically noisy environments such as cogeneration facilities and wastewater treatment plants.

Sample Compatibility & Compliance

The MULTi 2000 Plus is optimized for low-pressure, ambient-temperature gas streams typical of biogas upgrading, landfill gas recovery, and combustion exhaust monitoring. It accepts sample flows between 0.5–2.0 L/min, with inlet pressure tolerance of 80–120 kPa (absolute). Sample conditioning is recommended for streams containing condensable hydrocarbons, H₂S (>50 ppm), or particulates >5 µm; optional heated sample lines and acid gas scrubbers are available as system-level accessories. From a regulatory standpoint, the analyzer meets the functional requirements of EN 16726:2016 for biomethane quality verification and supports compliance reporting under EU Directive 2009/28/EC. While not intrinsically safe certified, it may be deployed in Zone 2 hazardous areas when installed with appropriate barrier systems and documented risk assessment per ATEX 2014/34/EU.

Software & Data Management

Data acquisition and configuration are managed via the embedded web interface (HTTP/HTTPS) or RS-485 Modbus RTU protocol. No proprietary software installation is required—configuration, calibration logging, and alarm threshold setting are performed through a standards-compliant browser. All measurement values, timestamps, diagnostic flags, and calibration events are stored locally in non-volatile memory with configurable retention (default: 30 days). When interfaced with enterprise SCADA or DCS platforms, the device supports timestamped, signed data export compliant with FDA 21 CFR Part 11 Annex 11 principles—including user authentication, electronic signatures, and immutable audit trails—provided the host system implements appropriate access controls and backup policies.

Applications

• Biogas plant process control: Real-time CH₄/CO₂ ratio monitoring for digester optimization and desulfurization efficiency assessment.
• Biomethane upgrading verification: Continuous verification of pipeline-quality gas (≥95% CH₄, <2% CO₂, <10 ppm CO, 0–1% O₂) prior to grid injection.
• Landfill gas management: Quantification of fugitive emissions and leachate gas composition for regulatory reporting (e.g., US EPA Method 21, EU LCP BREF).
• Combustion safety monitoring: Dual-channel O₂/CO tracking in boiler flue gas and burner air supply for stoichiometric control and CO hazard mitigation.
• Research & development: Stable baseline measurements in controlled laboratory studies of microbial methanogenesis or catalyst performance under varying feedstock compositions.

FAQ

What gas detection technologies are used in the MULTi 2000 Plus?

NDIR sensors for CH₄ and CO₂; electrochemical sensors for CO and O₂; all with integrated temperature and barometric pressure compensation.
Can the analyzer operate unattended for extended periods?

Yes—designed for 24/7 operation with automatic zero/span validation cycles (user-configurable interval) and diagnostic-driven maintenance alerts.
Is factory calibration traceable to national standards?

Calibration certificates include traceability to PTB (Physikalisch-Technische Bundesanstalt) or NIST-traceable reference gases, with uncertainty budgets per ISO/IEC 17025.
How is data integrity ensured during power interruption?

Critical parameters and last 72 hours of measurement data are retained in EEPROM; clock battery backup maintains accurate timestamps across outages.
Does the device support remote firmware updates?

Firmware updates are performed via secure HTTPS upload with SHA-256 signature verification; rollback capability is retained for validation purposes.