CUBIC INSTRUMENTS Gasboard-9007 Zero Air Generator

Overview

The CUBIC INSTRUMENTS Gasboard-9007 Zero Air Generator is an engineered solution for metrologically traceable zero gas supply in motor vehicle emission testing laboratories and inspection stations. It operates on a multi-stage purification principle—combining catalytic oxidation, selective adsorption, and precision dew point control—to convert oil-free compressed air into ultra-pure zero air compliant with stringent regulatory specifications. Unlike cylinder-based zero gas sources, the Gasboard-9007 eliminates logistical dependency on high-pressure gas deliveries, reducing long-term operational risk and recurring calibration gas procurement costs. Its design targets continuous, unattended operation in ambient environments typical of Chinese motor vehicle inspection facilities (MVIS), where stable zero-air supply is critical for infrared (IR), ultraviolet (UV), and IR-plus-converter-furnace-based exhaust analyzers used in gasoline and diesel vehicle emissions testing.

Key Features

• Multi-stage purification architecture: integrated high-temperature catalytic oxidation furnace (≥350 °C), dual-bed molecular sieve/activated carbon adsorption modules, and a thermoelectrically cooled condensate removal system ensuring consistent dew point ≤−20 °C.
• Regulated output: adjustable pressure (0–0.2 MPa) and flow rate (≥16 L/min), supporting simultaneous zeroing and span calibration of up to four or more exhaust analyzers via six independent output channels.
• Automatic condensate management: self-draining water separator with level-sensing capability; performance is independent of inlet air dew point, accommodating variable ambient humidity conditions without manual intervention.
• Robust mechanical design: modular internal layout facilitates field serviceability; stainless-steel and electropolished brass components minimize outgassing and corrosion; rated for continuous duty cycles over 6 years under GLP-aligned maintenance schedules.
• Low-maintenance operation: no consumables requiring scheduled replacement beyond periodic filter element changes (typically every 6–12 months depending on inlet air quality); front-panel status indicators monitor catalytic bed temperature, pressure differential, and system readiness.

Sample Compatibility & Compliance

The Gasboard-9007 delivers zero air meeting the compositional limits specified in national regulatory standards governing motor vehicle emission testing in China: GB 18285–2018 (gasoline vehicles), GB 3847–2018 (diesel vehicles), and HJ 1237–2021 (periodic inspection protocols). Its certified output—HC <1 ppmv (as propane), CO <1 ppmv, CO₂ <2 ppmv, NO <1 ppmv, NO₂ <1 ppmv, O₂ = 20.8% ± 0.2%, and dew point ≤−20 °C—is validated using NIST-traceable reference analyzers during factory acceptance testing. The unit is compatible with all major OEM exhaust analyzers utilizing non-dispersive infrared (NDIR), UV absorption, or chemiluminescence detection principles—including those employing catalytic conversion for NOₓ measurement. It satisfies the zero-gas purity requirements referenced in ISO 16183:2021 (air quality—specifications for zero air used in ambient air monitoring) and aligns with ASTM D6196–22 Annex A1 for zero air qualification in regulated environmental testing.

Software & Data Management

The Gasboard-9007 operates as a standalone hardware platform with embedded microcontroller-based logic—no external PC or proprietary software is required for basic operation. All system parameters (inlet pressure, catalytic furnace temperature, outlet dew point, flow stability) are monitored in real time via analog sensors and displayed on a backlit LCD interface. For integration into laboratory information management systems (LIMS) or centralized facility monitoring networks, optional RS-485 Modbus RTU output enables telemetry of operational status, fault codes, and runtime hours. Audit trails—such as power-on cycles, maintenance alerts, and pressure deviation events—are stored internally for ≥30 days and can be exported via USB port for GLP/GMP documentation compliance. While not FDA 21 CFR Part 11–certified by default, the device supports electronic record retention practices consistent with ISO/IEC 17025:2017 Clause 7.5.2 when deployed within validated workflows.

Applications

• Zero-point calibration and span verification of NDIR-based CO, CO₂, HC, and NOₓ analyzers in motor vehicle inspection stations.
• Oxygen sensor linearity adjustment and cross-sensitivity compensation in dual-sensor or multi-gas exhaust measurement platforms.
• Pneumatic purging of optical cells, sample lines, and detector chambers to prevent hydrocarbon residue buildup and baseline drift.
• Zero-air supply for dynamic dilution calibrators (e.g., permeation tubes, mass flow mixers) used in trace-level standard generation.
• Reference gas source for method validation studies under CNAS-accredited environmental testing laboratories.

FAQ

What inlet air quality is required for reliable operation?
Oil-free compressed air with minimum pressure ≥0.8 MPa, power ≥1500 W, and storage capacity ≥15 L is mandatory. Inlet air must comply with ISO 8573-1 Class 1:2:1 (solid particles, water, oil) prior to connection.
Can the Gasboard-9007 replace cylinder zero air in accredited labs?
Yes—provided the unit undergoes initial third-party verification against ISO 16183 or GB/T 33037–2016 and is included in the lab’s scope of accreditation per CNAS-CL01:2018 Clause 7.7.
How often does the catalytic converter require replacement?
Under normal operating conditions and with proper inlet filtration, the high-temperature catalyst maintains activity for ≥12,000 hours; replacement is only necessary if furnace temperature fails to stabilize at setpoint or output impurity levels exceed specification limits.
Is remote monitoring supported?
Standard configuration includes local display only; RS-485 Modbus RTU interface is available as a factory-installed option for integration with SCADA or building management systems.
Does the unit include an air compressor?
No—the Gasboard-9007 requires an externally supplied oil-free air source meeting the specified pressure, power, and tank volume criteria; this is explicitly excluded from the delivered system.