Overview
AFV3221 VOC gas sensor adopts multilayer thick film manufacturing technology. The heater and metal oxide semiconductor material on the ceramic substrate of subminiature Al2O3 are fetched out by electrode down-lead, encapsulated in metal socket and cap. Conductivity of the sensor is affected by the concentration of target gas. The higher the concentration is, the higher conductivity of sensor gets. Users can adopt simple circuit to convert variation of conductivity into output signal corresponding to gas concentration.
Key Features
High sensitivity to organic gases such as toluene, benzene, methanal; quick response and recovery; low power consumption, simple detection circuit, good stability and long life.
Applications
It is used in automatic exhaust device, air cleaner in domestic occasion for harmful gas detection.
Technical Specifications
| Model | AFV3221 | ||
| Sensor Type | Semiconductor flat surfaced sensor | ||
| Standard Encapsulation | Metal Cap | ||
| Detection Gas | toluene, methanal, benzene, alcohol, acetone &etc. | ||
| Detection range | 1~50ppm | ||
| Standard circuit | Loop voltage | VC | ≤24V DC |
| Heating voltage | VH | 5.0V±0.1V AC or DC | |
| Load resistance | RL | Adjustable | |
| sensor features in standard test condition | Heating resistance | RH | 90Ω±10Ω(Room Tem.) |
| Heating consumption | PH | ≤300mW | |
| Surface resistance | RS | 10KΩ~100KΩ(in 10ppm toluene) | |
| Sensitivity | S | Rs(in air)/Rs(in 10ppm toluene)≥3 | |
| Concentration slope | α | ≤0.6(R50ppm/R5ppm toluene) | |
| Standard condition of test | Temperature, humidity | 20°C±2°C;65%±5%RH | |
| Standard test circuit | VC:5.0V±0.1V; VH:5.0V±0.1V | ||
| Warm-up time | Not less than120 hours |
