SmartGas C2H4 Infrared Ethylene Gas Sensor
| Brand | SmartGas |
|---|---|
| Origin | Germany |
| Manufacturer Type | Authorized Distributor |
| Import Status | Imported |
| Model | C2H4 |
| Output Signals | 4–20 mA / 0–20 mA analog, 0–1 V / 0–2.5 V analog, RS-485 digital interface |
| Housing | Robust industrial enclosure |
| Connection | Flexible tubing interface |
| Technology | Non-dispersive infrared (NDIR) detection |
Overview
The SmartGas C2H4 Infrared Ethylene Gas Sensor is a high-stability, maintenance-free NDIR (Non-Dispersive Infrared) gas sensing module engineered for continuous, real-time monitoring of ethylene (C₂H₄) concentration in industrial process streams, controlled atmosphere storage facilities, and laboratory-scale fermentation or ripening environments. Unlike electrochemical or catalytic bead sensors, this device leverages dual-wavelength NDIR spectroscopy—measuring absorption at the characteristic 10.5 µm fundamental vibrational band of ethylene while simultaneously referencing a non-absorbing wavelength—to deliver long-term baseline stability, minimal cross-sensitivity to CO₂, H₂O vapor, and common background gases, and immunity to poisoning or drift from ambient humidity fluctuations. The sensor operates on the principle of Beer–Lambert law-based optical absorption quantification, with factory-calibrated response traceable to NIST-certified reference gas standards. It is designed for integration into OEM gas analyzers, environmental monitoring cabinets, and inline packaging line controllers where regulatory-grade repeatability and operational longevity are critical.
Key Features
- NDIR optical detection architecture with thermopile detector and IR source—no consumables, no electrolyte, no recalibration required under stable operating conditions
- Robust stainless steel and anodized aluminum housing rated IP65 for resistance to dust ingress and low-pressure water jets
- Modular tubing interface compatible with standard 6 mm OD PTFE or stainless-steel sample lines; includes integrated flow restrictor and moisture trap mounting points
- Multi-format output options: isolated 4–20 mA current loop (HART-compatible), voltage outputs (0–1 V and 0–2.5 V, ratiometric to supply), and RS-485 Modbus RTU protocol for networked deployment
- Operating temperature range: −10 °C to +50 °C; compensated for thermal drift across full range via onboard thermistor and digital signal processing
- Zero and span stability: <±2% FS/year typical; verified per ISO 12039 and EN 14625 guidelines for fixed gas detection systems
Sample Compatibility & Compliance
The C2H4 sensor is validated for use with dry or moderately humid gas matrices (up to 90% RH, non-condensing). Condensate formation must be prevented upstream via chilled mirror dew point control or permeation dryers. It exhibits negligible interference from CO₂ (cross-sensitivity <0.5% of reading at 5% v/v CO₂), CH₄ (<0.3%), O₂, N₂, and Ar. Performance complies with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emissions) for industrial environments. When integrated into complete analyzers, the system supports compliance with EPA Method 25A for hydrocarbon emission monitoring and meets functional safety requirements aligned with SIL 2 per IEC 61508 when used with appropriate safety logic solvers.
Software & Data Management
While the sensor itself is analog/digital-output only (no embedded firmware UI), it is fully interoperable with SmartGas’ SG-Config PC utility and third-party SCADA/HMI platforms (e.g., Ignition, Siemens Desigo, Wonderware) via Modbus RTU. Configuration parameters—including damping time (0.1–30 s), linearization curve selection, alarm thresholds, and unit scaling (ppm, %vol, mg/m³)—are programmable over RS-485. All configuration changes are logged with timestamp and user ID when paired with audit-ready host systems compliant with FDA 21 CFR Part 11 and EU Annex 11 requirements. Raw analog outputs support direct connection to PLC analog input modules with 16-bit resolution ADCs for GLP/GMP traceability.
Applications
- Controlled-atmosphere fruit and vegetable storage (e.g., banana, tomato, apple ripening rooms)
- In-line monitoring of ethylene evolution in bioreactors and microbial fermentation processes
- Leak detection and purity verification in petrochemical ethylene production and distribution infrastructure
- Quality assurance testing of ethylene-scavenging packaging films and sachets
- Environmental chamber validation for plant physiology and postharvest research (ASTM D618, ISO 2231)
- OEM integration into portable emissions analyzers for agricultural combustion sources
FAQ
What is the typical measurement range for this sensor?
Standard configuration covers 0–100 ppm and 0–1,000 ppm full scale; custom ranges up to 0–10,000 ppm are available upon request.
Does the sensor require periodic calibration?
Field zero calibration is recommended every 6–12 months depending on exposure history; span calibration using certified C₂H₄/N₂ standard gas is advised annually or after major maintenance.
Can it operate in explosive atmospheres?
No—the base sensor is not ATEX or IECEx certified; explosion-proof enclosures or purge systems must be implemented by the system integrator per IEC 60079-0 and -15.
Is temperature compensation built-in?
Yes—integrated Pt1000 temperature sensor and digital compensation algorithm ensure accuracy across −10 °C to +50 °C without external correction.
How is moisture handled in the sample stream?
Condensed water must be removed upstream; optional integrated sintered stainless-steel hydrophobic filter (pore size 5 µm) and Nafion™ dryers are supported via accessory ports.
