Overview
Sensitive material of NZ-8D gas sensor is SnO2, which with lower conductivity in clean air. It make detection by method of cycle high and low temperature, and detect CO at low temperature (heated by 1.5V).The sensor’s conductivity gets higher along with the CO gas concentration rising. At high temperature (heated by 5.0V),it cleans the other gases adsorbed at low temperature. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
Key Features
It has good sensitivity to carbon monoxide in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Applications
It is widely used in domestic CO gas leakage alarm, industrial CO gas alarm and portable CO gas detector.
Technical Specifications
| Model | NZ-8D | ||
| Sensor Type | Semiconductor | ||
| Standard Encapsulation | Plastic cap | ||
| Target Gas | carbon monoxide | ||
| Detection range | 10~500ppm CO | ||
| Standard CircuitConditions | Loop Voltage | Vc | 5.0V±0.1V DC |
| Heater Voltage | VH | 5.0V±0.1V AC or DC(High temp.)1.5V±0.1V AC or DC(Low temp.) | |
| Heater Time | TL | 60 S±1S(High temp.)90 S±1S(Low temp.) | |
| 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 150ppm CO)≥5 | |
| Output Voltage | Vs | 2.5V~4.3V (in 150ppm CO) | |
| Concentration Slope | α | ≤0.6(R300ppm/R50ppmCO) | |
| Standard test conditions | Tem. Humidity | 20°C±2°C;55%±5%RH | |
| Standard test circuit | Vc:5.0V±0.1V;VH (High temp.): 5.0V±0.1VVH (Low temp.): 1.5V±0.1V | ||
| Preheat time | Not less than 48 hours | ||
| O2 content | 21%(not less than 18%)O2 concentration effects initial value, sensitivity and repeatability. | ||
| Preheat time | Over 48 hours | ||
| Lifespan | 10years |
