Ethylene Gas Sensor by SmartGas

Overview

The SmartGas Ethylene Gas Sensor is a non-dispersive infrared (NDIR) based analytical device engineered for continuous, selective, and stable detection of ethylene (C₂H₄) in ambient air or process gas streams. Leveraging dual-wavelength NDIR spectroscopy—where one wavelength targets the characteristic absorption band of ethylene near 10.5 µm and the other serves as a reference—the sensor delivers high specificity with minimal cross-sensitivity to common interferents such as CO₂, H₂O vapor, methane, or propylene. Designed for integration into OEM systems, environmental monitoring stations, controlled atmosphere storage facilities, and industrial safety networks, this sensor operates on the principle of Beer–Lambert law-based absorbance quantification, enabling reliable real-time measurement across low-concentration ranges critical for post-harvest fruit ripening control and petrochemical leak detection.

Key Features

• NDIR optical detection architecture with thermopile detector and integrated IR source for long-term signal stability
• Typical measurement range: 0–100 ppm or 0–1000 ppm (configurable per application; factory calibration traceable to NIST-certified standards)
• Response time (T90): <30 seconds under standard conditions (23 °C, 1 atm, 50% RH)
• Operating temperature range: −10 °C to +50 °C; compensated for thermal drift via onboard temperature sensor and digital correction algorithm
• IP65-rated housing suitable for indoor and semi-outdoor deployment; stainless steel or anodized aluminum enclosure options available
• Output interfaces: 4–20 mA analog current loop (2-wire), RS-485 Modbus RTU, and optional I²C or UART digital output for embedded integration
• Low power consumption: <1.2 W typical; compatible with 12–24 VDC regulated supply

Sample Compatibility & Compliance

This sensor is validated for use in clean, dry, non-corrosive gas matrices. For applications involving particulate-laden, high-humidity, or acidic environments (e.g., compost off-gas or fermentation exhaust), optional hydrophobic membrane filters and heated sample lines are recommended. The device complies with CE marking requirements under the EU Electromagnetic Compatibility Directive 2014/30/EU and RoHS 2011/65/EU. While not intrinsically safe certified out-of-the-box, it may be deployed in Zone 2 hazardous areas when installed within an approved barrier system meeting ATEX/IECEx guidelines. Calibration intervals are defined per ISO 14644-3 and aligned with GLP practices for environmental monitoring workflows.

Software & Data Management

SmartGas provides the SG-Config utility software (Windows-based) for sensor configuration, zero/span calibration, alarm threshold setting, and firmware updates via USB-to-serial interface. Raw sensor data—including concentration value, temperature, signal amplitude, and diagnostic flags—is timestamped and exportable in CSV format. When integrated into larger SCADA or BMS platforms, the Modbus register map supports readout of live values, status bits (e.g., sensor fault, calibration due, signal saturation), and historical event logs. Audit trails comply with FDA 21 CFR Part 11 requirements when used with validated host systems supporting electronic signatures and change control.

Applications

• Controlled atmosphere (CA) and dynamic controlled atmosphere (DCA) storage for apples, pears, and kiwifruit—monitoring ethylene to suppress premature ripening
• Industrial hygiene monitoring in ethylene oxide sterilization facilities and polyethylene production plants
• Research-grade plant physiology studies tracking endogenous ethylene emission from stressed or senescing tissues
• Early-warning leak detection in petrochemical refineries, LNG terminals, and pipeline compressor stations
• OEM integration into smart agricultural IoT gateways, HVAC controllers, and food logistics telematics units

FAQ

What is the recommended calibration frequency?
Annual calibration is advised for routine environmental monitoring; semi-annual calibration is recommended for safety-critical or regulatory reporting applications.
Can the sensor operate in high-humidity environments?
Yes, with optional hydrophobic sintered filter (PTFE membrane) and condensate trap; dew point should remain below sensor inlet temperature.
Is field recalibration possible without specialized equipment?
Zero calibration can be performed using nitrogen or clean synthetic air; span calibration requires certified ethylene standard gas (e.g., 50 ppm C₂H₄ in N₂) and calibrated flow controller.
Does the sensor support Modbus TCP?
No—only Modbus RTU over RS-485; TCP/IP gateway integration requires external protocol converter.
What is the expected service life of the IR source and detector?
Rated for >5 years continuous operation under specified environmental conditions; mean time between failures (MTBF) exceeds 30,000 hours per IEC 61508 Annex B methodology.