Not only gas is convenient for life in a city, but also being a guarantee for residents to improve their quality of life. For ordinary families, with a gas alarm to protect the safety of family gas is the most appropriate. Household gas alarm is used to detect whether the gas leakage in a home device, generally installed in the family kitchen. When the concentration of fuel gas in the air exceeds the preset value, the alarm will be triggered and the sound and light alarm signal will be sent. If connected to the alarm host and the alarm center, the network can also alarm, and at the same time, the gas valve will be automatically closed and the air exhaust device will be opened to ensure the safety of the life and property of personnel. The domestic gas alarm mainly adopts semiconductor, planar semiconductor, catalysis and MEMS sensors as detecting elements. At present, the domestic products occupy the mainstream market with the measurement range of 0-10000ppm and 100% LEL. Semiconductor and catalytic components are low cost, easy to develop, and widely used in domestic gas alarms. MEMS gas sensor is used in the market due to its small size, low power consumption and easy integration.

Sensor recommended:

Technical specifications：

（1）Media: C3H8, C4H10

（2）Sealing type: rubber seat, 100 mesh stainless steel cap

（3）Voltage in clean air: V0=0.5~1.5V(depends on the loading)

（4）Voltage in calibration gas : V1＞2.5v

（5）Response time: ≤20s

（6）Recovery time:≤30s

（7）Measuring pole voltage: Vc=5v±0.1

（8）Heating pole voltage: Vh=5v±0.1

（9）Load resistor: RL=1K~50k(adjustable)

（10）Working temperature: -10℃---+50℃

（11）Storing temperature: -20℃---+60℃

（12）Relative humidity: <95%

（13）Testing range: 100-10000ppm

（14）Air pressure: 650-800mmHg

（15）Pre-heating time: 24h