Overview
Sensitive material of NZ249 gas sensor is SnO2, which with lower conductivity in clean air. When VOC gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
NZ249 gas sensor has high sensitivity to toluene, acetone, alcohol, methanol, also can monitor hydrogen and other organic vapour well. It can detect kinds of organic gases and is a kind of low-cost sensor for kinds of applications.
Key Features
It has good sensitivity to organic vapour gas in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Applications
It is widely used in domestic VOC gas alarm, industrial VOC gas leakage alarm and portable VOC gas detector.
Technical Specifications
| Model | NZ249 | ||
| Sensor Type | Semiconductor | ||
| Standard Encapsulation | Bakelite, Metal cap | ||
| Target Gas | toluene, acetone, alcohol, hydrogen | ||
| Detection range | 5~500ppm | ||
| Standard Circuit Conditions | Loop Voltage | Vc | 5.0V±0.1V DC |
| Heater Voltage | VH | 5.0V±0.1V AC or DC | |
| Load resistance | RL | Adjustable | |
| Sensor character under standard test conditions | Heater Resistance | RH | 30Ω±3Ω(room temp.) |
| Heater consumption | PH | ≤950mW | |
| Sensitivity | S | Rs(in air)/Rs(in 50ppm toluene)≥2 | |
| Output Voltage | △Vs | 0.5V (in 50ppmtoluene) | |
| Concentration Slope | α | ≤0.6(R200ppm/R50ppm toluene) | |
| Standard test conditions | Tem. Humidity | 20°C±2°C;55%±5%RH | |
| Standard test circuit | Vc:5.0V±0.1V; VH:5.0V±0.1V | ||
| Preheat time | Over 48 hours |
