MEMS SMOKE GAS SENSOR PN: S109Y Product description S109Y is a miniature metal oxide semiconductor gas sensor based on MEMS micro hot plate technology, used to detect smoke and VOC in the air. The production of the sensor combines MEMS silicon substrate technology, thin film technology, thick film technology, and metal packaging technology. When the sensor is in a polluted gas environment, the conductivity of the sensor changes with the concentration of the detected gas in the air. The higher the concentration of the gas, the higher the conductivity of the sensor. Using a simple circuit, the change in conductivity can be converted into an output signal corresponding to the gas concentration. Detection gas type: Smoke, methane, propane, hydrogen, VOC 0-5000PPPM methane Features: ➢ High sensitivity to formaldehyde (0-10ppm) ➢ Quick response (~15Sec.) ➢ Very low power consumption (40~45mW) ➢ Ultra-small size (3.8mm × 3.8mm × 1.5mm) ➢ Long life (~ 5 years) ➢ Long-term stability ➢ Reflow soldering possible Main application: ➢ Detection of formaldehyde in civil, industrial and environmental protection ➢ Internet of Things, wearable dev

1) Sensor calibration The accuracy of the sensor is affected by the difference in reference resistance, sensitivity difference, temperature, humidity, interference gas, aging time and other factors between the sensors. There are nonlinear, hysteresis and non-repeatable working characteristics between the input and output. Therefore, the absolute concentration measurement must be calibrated regularly (single-point/multipoint calibration can be performed in the full range) to ensure the accurate transmission of the value, and the relative measurement does not require calibration. 2) The air-sensitive...

Package outline:

The sensor 2 and 3 pins are connected to the heating circuit, and the 1 and 4 pins are connected to the measurement circuit; under the premise of meeting the electrical performance requirements of the sensor, the heating and measurement can share the same power circuit. Measuring circuit Description: VH: DC 3 V Vc: DC 3 V RL is the load resistance. To prevent damage to the gas sensor, RL>10KQ is recommended. In order to maximize the performance advantages of the gas sensor, the heating circuit can be designed for temperature compensation. If you need temperature compensation design, please contact...

Precautions 1 Situations that must be avoided 1.1 Exposure to silicone vapor If organic silicon vapor is adsorbed on the surface of the sensor, the sensitive material of the sensor will be wrapped, inhibiting the sensitivity of the sensor, and it is irreversible. The sensor should not be exposed to the place where silicone adhesive, hair spray, silicone rubber, putty or other siliconecontaining plastic additives may exist. 1.2 Highly corrosive environment Exposure of the sensor to high-concentration corrosive gases (such as H2S, SOX, Cl2, HCl, etc.) will not only cause corrosion or damage to...

2.6 Shock If the sensor receives a strong impact, its lead wire will break. 2.7 Use Manual welding is the most ideal welding method for sensors. The use of wave soldering should meet the following conditions: 2.7.1 Flux: Rosin flux with the least chlorine 2.7.2 Speed: 1-2 m/min 2.7.3 Preheating temperature: 100±20℃ 2.7.4 Welding temperature: 250±10℃ 2.7.5 1 pass through the wave soldering machine Violation of the above conditions of use will degrade the sensor characteristi