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FC-22-A MQ-2 Combustible Gas Sensor Module for Liquefied Gas / Propane / Hydrogen - Blue + Silver
Model: FC-22-A - Quantity: 1- Color: Blue + silver- Material: PCB- Sensitive material of MQ-2 gas sensor is SnO2£¬ which is with lower conductivity in clean air. When the target combustible gas exist£¬ The sensors conductivity is more higher along with the gas concentration rising; Please use simple electrocircuit£¬ Convert change of conductivity to correspond output signal of gas concentration- MQ-2 gas sensor has high sensitive to LPG£¬ Propane and Hydrogen£¬ also could be used to Methane and other combustible steam£¬ it is with low cost and suitable for different application- Using high-quality dual-panel design£¬ with a power indicator and TTL signal output instructions; With a the DO switch signal (TTL) output£¬ and AO analog signal output; TTL output valid signal is low level; (When the low level output signal lights£¬ it can be connected directly to the microcontroller or relay module)- 0~5V analog output voltage£¬ the higher the concentration£¬ the higher the voltage; Carbon monoxide detector£¬ better sensitivity; There are four screw holes for easy positioning; With a long life and reliable stability; Rapid response and recovery characteristics- Operating voltage: DC 5V- Explanation: Use Preheat 20S- The first step: to the module for 5V DC (note the positive and negative do not reverse£¬ otherwise easily burned chip).- The second step: If you select the output end of the high and low DO£¬ TTL output signal can be connected directly to a microcontroller IO port or connect to the relay module£¬ potentiometer is used to adjust the output level transition threshold.- The third step: If you choose to AO£¬ analog output£¬ so you do not have control potentiometer AO feet directly connected to the input of the AD converter or microcontroller with AD can. According to our experience: In a normal environment£¬ namely: the environment of the measured gas£¬ setting the sensor output voltage value of the reference voltage£¬ At this time£¬ the voltage of the AO end about 1V£¬ when the sensor detects that the gas to be measured when the voltage of each elevated 0.1V£¬ the actual measured gas concentrations 200ppm (simple: 1ppm = 1mg/kg = 1mg / L = 10-6 commonly used to indicate the gas concentration£¬ or the concentration of the solution.)£¬ on the basis of this parameter can microcontroller inside the measured analog voltage value is converted to concentration values. Note: If you are used to do a precision instrument£¬ please buy the standard calibration instrument market£¬ or there is an error£¬ because the ratio of the output concentration and voltage relationship is linear£¬ but tends to be linear- Special note: the sensor is powered Preheat 20S stable measurement data£¬ sensor fever is a normal phenomenon£¬ because the internal heating wire£¬ if hot is not normal- Packing List:- 1 x MQ-2 sensor module