CUBIC INSTRUMENTS Gasboard-2102 Microflow Dual-Chamber NDIR NO Gas Sensor

Overview

The CUBIC INSTRUMENTS Gasboard-2102 is a high-stability, low-range nitric oxide (NO) gas sensor engineered for precision environmental and automotive emissions monitoring. It employs proprietary microflow non-dispersive infrared (NDIR) detection technology protected under international PCT patent PCT/CN2018100767. Unlike conventional single-beam NDIR sensors, the Gasboard-2102 integrates a dual-chamber optical architecture—comprising an active measurement chamber and a sealed reference chamber—enabling real-time differential signal analysis. Infrared radiation from a broadband source passes through both chambers; absorption by NO molecules in the sample chamber generates a pressure differential across a micro-machined diaphragm in the microflow transducer, producing a measurable acoustic signal proportional to concentration. The reference chamber compensates for drift induced by ambient temperature fluctuations, aging of IR source intensity, and detector responsivity degradation—critical for long-term field deployment without recalibration.

Key Features

• Microflow NDIR sensing principle with patented dual-gas-cell design for enhanced baseline stability and zero-drift suppression
• Integrated automatic temperature and barometric pressure compensation algorithms compliant with ISO 12039 and EPA Method 21 requirements
• Modular sensor architecture optimized for OEM integration into portable analyzers, continuous emission monitoring systems (CEMS), and on-board diagnostic (OBD-II) platforms
• High signal-to-noise ratio (SNR) achieved via narrowband interference filters centered at 5.3 µm—the fundamental absorption band of NO—minimizing cross-sensitivity to CO, CO₂, NO₂, and hydrocarbons
• Robust mechanical housing rated IP65, supporting operation in -10 °C to +50 °C ambient conditions and relative humidity up to 95% non-condensing

Sample Compatibility & Compliance

The Gasboard-2102 is validated for direct sampling of humid, particulate-laden gas streams typical of diesel and gasoline exhaust, municipal incinerator flue gas, and ambient urban air. Its dual-chamber configuration inherently rejects common interferents including water vapor (H₂O), carbon dioxide (CO₂), and methane (CH₄), eliminating the need for external scrubbers or catalytic converters in most applications. The sensor meets electromagnetic compatibility (EMC) standards per EN 61326-1:2013 and safety requirements under IEC 61010-1:2010. For regulatory reporting, its metrological performance aligns with ISO 12039:2000 (stationary source emissions—determination of NOₓ concentrations) and supports GLP-compliant data acquisition when paired with traceable calibration gases certified to ISO 6141.

Software & Data Management

The sensor outputs analog (0–5 V or 4–20 mA) and digital (RS485 Modbus RTU) signals, enabling seamless integration with SCADA, PLC, and custom DAQ platforms. Firmware includes configurable linearization tables, user-defined alarm thresholds, and built-in diagnostics (e.g., source health monitoring, chamber contamination flagging). When deployed in networked systems, raw sensor data can be time-stamped and archived with audit-trail functionality compliant with FDA 21 CFR Part 11 requirements for electronic records and signatures—essential for environmental compliance reporting and QA/QC documentation.

Applications

• Real-time NO monitoring in vehicle exhaust testing benches (e.g., chassis dynamometers per ISO 8714 and SAE J1349)
• Fixed-site ambient air quality networks measuring urban NOₓ pollution (EU Directive 2008/50/EC, US EPA NAAQS)
• Integration into portable multi-gas analyzers for industrial hygiene and occupational exposure assessment (OSHA PEL, ACGIH TLV)
• Feedback control in selective catalytic reduction (SCR) systems for power plants and marine engines
• Research-grade atmospheric chemistry studies requiring sub-ppm NO resolution and long-term baseline fidelity

FAQ

What is the recommended calibration interval for the Gasboard-2102 in continuous monitoring applications?

For regulatory-grade deployments, quarterly span calibration using certified NO standard gas (±2% uncertainty) is advised. Zero calibration may be performed daily via clean synthetic air if ambient conditions exceed ±5 °C/hour variation.
Can the Gasboard-2102 be used in high-humidity exhaust streams without condensation?

Yes—the sensor’s internal thermal management and hydrophobic inlet filter mitigate moisture-related signal attenuation. However, sustained exposure to dew point >45 °C requires optional heated sample line integration.
Does the module support firmware updates in the field?

Yes—via RS485 interface using CUBIC’s standardized DFU protocol. Updates preserve user-configured parameters and retain factory calibration coefficients.
Is the sensor compatible with explosion-proof enclosures?

The Gasboard-2102 itself is intrinsically safe (IEC 60079-11:2013, Class I, Division 2), and has been successfully integrated into ATEX-certified analyzer housings for refinery and petrochemical use cases.
How does the microflow architecture improve long-term stability compared to traditional NDIR?

By eliminating moving parts and relying on pressure-wave detection rather than photodiode current measurement, the microflow design reduces sensitivity to optical misalignment, lens fouling, and LED spectral drift—key failure modes in legacy NDIR sensors operating beyond 12 months.