Hitech IR600 Online Biogas Analyzer

Overview

The Hitech IR600 Online Biogas Analyzer is a robust, single-channel, non-dispersive infrared (NDIR) gas analyzer engineered for continuous, real-time monitoring of carbon dioxide (CO₂) or methane (CH₄) in biogas streams and ambient process environments. Utilizing dual-wavelength NDIR detection—where one wavelength serves as the active absorption band and the other as a reference—the IR600 compensates for optical interference, dust accumulation, and source intensity drift without requiring frequent zero/span recalibration. This architecture delivers high long-term stability and measurement integrity under unattended operation, making it suitable for integration into industrial biogas upgrading plants, landfill gas recovery systems, anaerobic digestion facilities, and controlled-environment agriculture. The instrument operates on the principle of Beer–Lambert absorption spectroscopy, with optimized optical path design and temperature-stabilized detector electronics ensuring consistent spectral sensitivity across its full dynamic range.

Key Features

• Dual-wavelength NDIR sensing technology for drift-resistant, maintenance-light operation over 12-month calibration intervals
• Seven selectable CO₂ ranges (0–100% to 0–3000 ppm) and three CH₄ ranges (0–100%, 0–30%, 0–10%)—all configured via front-panel interface
• Integrated sample pump with particulate filter; supports remote sampling up to 30 m via conditioned tubing (optional desiccant trap available for high-humidity applications)
• 4-digit high-contrast LCD display with intuitive menu navigation and real-time status indicators (flow fault, alarm condition, sensor error)
• Two fully programmable relay outputs with SPDT contacts—configurable for concentration alarms, system interlocks, or process control actuation
• Linear 4–20 mA analog output compliant with industrial SCADA and DCS signal standards (max. 500 Ω load)
• IP54-rated polycarbonate enclosure—dust-protected and water-splashed resistant for deployment in semi-outdoor or utility-room environments
• Low power consumption (13 W typical) and universal AC input (110–240 V, 50/60 Hz) for global site compatibility

Sample Compatibility & Compliance

The IR600 is validated for use with dry or moderately humid biogas matrices containing CO₂ and/or CH₄ as primary analytes. It is not intended for corrosive, condensing, or heavily particulate-laden streams without appropriate pre-conditioning (e.g., coalescing filters, chillers, or permeation dryers). While the analyzer itself does not carry intrinsic safety certification (e.g., ATEX or IECEx), it may be installed in Zone 2 hazardous areas when housed within an approved purge cabinet or used with explosion-proof sample extraction systems. The device complies with electromagnetic compatibility (EMC) requirements per EN 61326-1:2013 and meets essential safety provisions of EN 61010-1:2010. Its measurement performance aligns with ASTM D1945 (standard test method for analysis of natural gas by gas chromatography) for comparative validation, and its stability specifications support routine quality assurance in ISO 14001-certified environmental monitoring programs.

Software & Data Management

The IR600 operates autonomously without host software dependency. All configuration—including range selection, alarm setpoints, relay logic (latching/non-latching), and display units—is performed locally via membrane keypad and LCD interface. Calibration is executed using certified span gas (e.g., 10% CO₂ in N₂) and zero gas (high-purity N₂), with built-in calibration mode guiding users through zero adjustment and gain correction. Though no native PC interface is provided, the 4–20 mA output enables seamless integration with third-party data loggers, PLCs, or cloud-based IIoT platforms supporting Modbus RTU (via optional analog-to-digital gateway). Audit trails are maintained manually via calibration logs; for GLP/GMP-regulated environments, external logging of calibration events and relay activation timestamps is recommended to satisfy 21 CFR Part 11 traceability expectations.

Applications

• Landfill gas collection and flaring optimization
• Real-time monitoring of digester effluent gas in wastewater treatment and agricultural biogas plants
• CO₂ enrichment control in commercial greenhouses and vertical farms
• Process gas verification in food packaging inerting and modified-atmosphere storage
• Leak detection and ventilation efficiency assessment in livestock housing and manure storage facilities
• Feedstock quality screening in anaerobic co-digestion trials
• Compliance reporting for EU Directive 1999/32/EC (reduction of sulphur content in liquid fuels) where biogas conditioning is involved

FAQ

Can the IR600 measure both CO₂ and CH₄ simultaneously?
No—the IR600 is a single-analyte platform. A dedicated unit is required for each gas species; dual-sensor configurations are not supported.
What is the recommended calibration frequency?
Annual calibration is sufficient under stable operating conditions; however, quarterly verification with traceable standard gases is advised for regulatory reporting or critical process control applications.
Is the internal pump sufficient for pressurized sample lines?
The integrated diaphragm pump is rated for suction-only sampling at ambient or slightly sub-atmospheric pressure; positive-pressure sample introduction requires an external booster or pressure regulator.
Does the analyzer support automatic temperature compensation?
Yes—ambient temperature compensation is embedded in firmware and applied continuously across the 0–40 °C operating range to minimize thermal-induced baseline shift.
Can the relay outputs drive solenoid valves directly?
Each relay is rated for 30 V DC / 30 A or 240 V AC / 2.5 A resistive load; direct actuation of industrial-grade solenoids (≤2.5 A @ 240 V AC) is permissible, though inductive kick suppression is recommended.