| Target Gas & Sensing Principle | Target Gas | Ethanol (C₂H₅OH) Vapor | - | Minimal cross-sensitivity to methane, propane, benzene, and common
VOCs |
| Sensing Principle | Semiconductor (Metal Oxide: SnO₂-based) | - | Resistance changes with ethanol concentration; heated by internal
micro-heater |
| Measurement Performance | Detection Range | 10 ~ 1000 ppm (Standard); 5 ~ 2000 ppm (Custom) | ppm | 10~1000 ppm for breath alcohol (BAC correlation: ~0.02~0.2 mg/L);
custom range for industrial use |
| Resolution | ≤ 1 ppm (10~1000 ppm range) | ppm | Minimum detectable concentration change |
| Accuracy | ±5% FS (25℃, 1 atm, 50% RH); ±10% FS (-10℃/+50℃) | - | FS = Full Scale; tested with 100 ppm ethanol standard gas |
| Response Time (T90) | ≤ 10 | Seconds | Time to reach 90% of stable output (at 50 ppm ethanol) |
| Recovery Time (T10) | ≤ 30 | Seconds | Time to drop to 10% of stable output (after removing ethanol) |
| Electrical Characteristics | Power Supply Voltage | 5.0 ± 0.2 V DC (Main); 3.3 ± 0.1 V DC (Heater) | V (DC) | Heater voltage must be stable (ripple ≤ 50 mV) to avoid drift |
| Operating Current | Total: ≤ 80 mA (Main: ≤ 20 mA; Heater: ≤ 60 mA) | mA | Heater current peaks at startup (≤ 100 mA for 30s); stabilize
afterward |
| Output Signal Type | Option 1: Analog (0.1 ~ 0.9 V DC, linear with concentration);
Option 2: Digital (UART, 9600 bps, 8N1) | - | Analog for simple circuits; UART for data logging/remote monitoring |
| Zero Drift (Monthly) | ≤ 2% FS | - | In clean air (ethanol < 1 ppm); drift increases in high humidity
(>80% RH) |
| Environmental Adaptability | Operating Temperature Range | -10 ~ 55 | ℃ | Optimal: 15 ~ 40℃ (minimal temperature interference) |
| Storage Temperature Range | -20 ~ 60 | ℃ | Store in dry, ethanol-free environment; avoid dust/condensation |
| Operating Humidity Range | 10 ~ 90 | % RH | Non-condensing; condensation damages the sensing film |
| Atmospheric Pressure Range | 86 ~ 106 | kPa | Suitable for altitudes ≤ 2000 meters; performance degrades above
3000 meters |
| Mechanical & Physical Specs | Package Type | DIP-6 (Dual In-line Package, 6 pins) | - | Easy to prototype; compatible with standard breadboards |
| Overall Dimensions (L×W×H) | 22.0 × 18.0 × 7.5 mm | mm | Excludes pin length (pins: 5.0 mm length, 0.6 mm diameter) |
| Weight | ≤ 10 g | g | Net weight (no cables or accessories) |
| Gas Intake Mode | Diffusion (Passive) | - | No external pump needed; ensure ≥ 3 mm clearance around the sensor
for airflow |
| Lifespan & Maintenance | Typical Operational Lifespan | ≥ 3 | Years | Under normal use (no exposure to ethanol > 2×FS, no corrosive
gases) |
| Calibration Interval | 12 ~ 24 | Months | Recommended for high-precision applications (use NIST-traceable
ethanol calibration gas: 100 ppm) |
| Preheating Time | 3 ~ 5 | | |
