Cubic Gasboard-8500D Ultrasonic Oxygen Sensor
| Brand | Cubic |
|---|---|
| Origin | Hubei, China |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Domestic (China) |
| Model | Gasboard-8500D |
| Price | USD 149 (FOB) |
| Detection Principle | Ultrasonic Time-of-Flight (TOF) |
| Measurement Range | 20.5–95.6% O₂ (binary gas mixtures) |
| Accuracy | ±3% FS @ (5–45)°C |
| Resolution | 0.1% O₂ |
| Response Time (T₉₀) | ≤10 s |
| Flow Rate Range | 0–80 L/min |
| Operating Temperature | 5–50°C |
| Operating Humidity | 0–95% RH (non-condensing) |
| Storage Conditions | −20–60°C, 0–95% RH (non-condensing) |
| Supply Voltage | DC 4.75–12.6 V |
| Average Current Consumption | <50 mA |
| Output Interface | UART TTL (3.3 V logic level) |
| Dimensions | 60.7 × 26 × 30 mm (L×W×D) |
Overview
The Cubic Gasboard-8500D is an industrial-grade ultrasonic oxygen sensor engineered for high-reliability, long-term deployment in medical gas delivery systems and critical environmental monitoring applications. Unlike electrochemical or zirconia-based oxygen sensors, the Gasboard-8500D employs time-of-flight (TOF) ultrasonic measurement — a physical principle that exploits the differential speed of sound in binary gas mixtures containing oxygen and inert carrier gases (e.g., N₂, Ar, or He). Sound velocity varies predictably with oxygen concentration due to differences in molecular mass and heat capacity; this relationship is calibrated and linearized across the 20.5–95.6% O₂ range. The sensor is specifically optimized for use in respiratory therapy devices including ventilators, humidified high-flow nasal cannula (HHFNC) systems, and anesthesia workstations where continuous, maintenance-free O₂ monitoring is mandated by IEC 60601-1 and ISO 80601-2-12 safety standards.
Key Features
- Ultrasonic TOF sensing architecture eliminates consumable electrodes, catalytic layers, or electrolyte degradation — enabling >5-year operational lifetime under continuous duty.
- Auto-calibration algorithm compensates for temperature drift and aging effects without external reference gas or manual intervention — compliant with GLP/GMP traceability requirements for Class II medical device subsystems.
- Wide dynamic flow tolerance (0–80 L/min) supports integration into both low-flow diagnostic analyzers and high-flow therapeutic gas circuits without flow restrictors or bypass calibration.
- Dual-inlet mechanical design allows symmetrical gas entry from either side, simplifying OEM integration into compact, space-constrained enclosures.
- Fast T₉₀ response ≤10 seconds ensures real-time feedback for closed-loop O₂ titration control in adaptive ventilation modes.
- Robust environmental rating: operates reliably from 5°C to 50°C at up to 95% RH (non-condensing), meeting IP20-equivalent ingress protection for indoor clinical environments.
Sample Compatibility & Compliance
The Gasboard-8500D is validated for binary gas mixtures only — primarily O₂/N₂ and O₂/Ar — and is not intended for use in multi-component or reactive gas streams (e.g., CO₂-rich, humidified CO, or NO-containing blends). It complies with RoHS 2011/65/EU and REACH SVHC regulations. Electrical interface meets IEC 61000-4-2 (ESD immunity ±4 kV contact) and IEC 61000-4-4 (EFT ±2 kV). Firmware supports configurable UART baud rates (9600–115200 bps) and includes CRC-8 checksum for data integrity verification — essential for FDA 21 CFR Part 11-compliant audit trails in regulated manufacturing and clinical QA workflows.
Software & Data Management
The sensor outputs ASCII-formatted O₂ concentration values via TTL-level UART (3.3 V logic), supporting direct integration with ARM Cortex-M, PIC, or ESP32 microcontrollers. Cubic provides a documented AT-command set for firmware configuration (e.g., output update rate, auto-zero enable/disable, temperature compensation toggle). Raw data logging is compatible with industry-standard platforms including LabVIEW (via NI-VISA), Python (pySerial), and MATLAB (Instrument Control Toolbox). Optional evaluation kit includes PC-based GUI software with real-time graphing, data export (CSV/Excel), and calibration history tracking — all timestamped and user-annotatable to satisfy ISO 17025 documentation requirements.
Applications
- Critical care ventilators requiring fail-safe O₂ concentration verification per ISO 80601-2-80.
- High-flow nasal oxygen therapy (HFNOT) devices operating at ≥60 L/min.
- Portable oxygen concentrators with integrated purity monitoring.
- Medical gas pipeline system monitors (ASSE 6040 / NFPA 99 compliance).
- Controlled atmosphere incubators and hypoxia/hyperoxia research chambers.
- OEM integration into CE-marked Class IIa medical devices under MDR Annex II technical documentation.
FAQ
Is the Gasboard-8500D suitable for measuring oxygen in ambient air?
No. Its calibration and algorithm are optimized exclusively for binary gas mixtures. Ambient air contains ~78% N₂, ~21% O₂, and ~1% Ar/CO₂, violating the two-component assumption required for ultrasonic TOF modeling.
Does it require periodic zero/span calibration with certified gas?
No. The sensor implements embedded temperature-compensated auto-zero during idle periods and maintains accuracy over its full lifecycle without external gas calibration — verified per ISO 13485 production testing protocols.
Can it be used in sterilization environments (e.g., ethylene oxide or hydrogen peroxide vapor)?
No. Exposure to aggressive oxidizing agents or condensable vapors will damage the acoustic transducer diaphragm and invalidate performance specifications.
What is the recommended warm-up time before stable readings?
Less than 60 seconds after power-on at 25°C ambient; full thermal stabilization (±0.1°C internal sensor temperature) occurs within 3 minutes under continuous flow.
Is analog voltage output available?
No. Only UART TTL (3.3 V) digital output is supported. External DAC conversion is required for analog signal routing.
