Garosa 2PCS MQ-3 Gas Sensor Module, Double-Sided Circuit Board Detector Breath Gas Detection Sensor Module

Detailed Test Parameters: Model: MQ-3 Detecting gas: vapor Detection concentration: 0.04-4mg/L Standard circuit condition: Loop voltage VC 24DC Heating voltage :VH 5.0±0.2V AC/DC Load : adjustable Gas sensor characteristics under standard test condition: Heating resistor 31Ω±3Ω Heating power consumption: 90mW Sensitive : 2KΩ-20KΩ (in 0.4mg/L ) Sensitivity: (in air) / (0.4mg / L ) 5 Concentration slope: 0.6 (R300ppm/R100ppm ) Standard test conditions: 20±2; 65%±5% RH Standard test circuit: 5.0V ± 0.1V Warm-up time: 48 hours Electrical Properties: Input voltage: DC5V Power consumption (current ): 150mA DO output: TTL digital 0 and 1 ( 0.1 and 3.3V) AO output: 0.1-0 .3V, the highest concentration voltage is about 4V Note: After the sensor is powered, needs to warm up around 20S, measured data was stable , heat sensor is a normal , because the internal heating wire , if hot is not normal. Wiring: 1. VCC: connected to the positive pole of the power supply 2. GND: connected to the negative power supply 3. DO: TTL switching output 4. AO: analog output Package list: 2 x Gas Sensor

• WITH INDICATOR: Using double-sided circuit board design, with power indicator and TTL output indicator.
• GOOD SENSITIVITY: With DO switching (TTL) output and analog output AO. High sensitivity for the detection of gas.
• OUTPUT: TTL output valid is low level. (When the output is low level, the light is on, it can be directly connected to the MCU or relay module).
• VOLTAGE: Analog output voltage, the higher the voltage, the higher the concentration. Rapid response and recovery characteristics.
• EASY TO POSITE: There are four screw holes for easy positioning.