MQ-7 Carbon Monoxide Sensor Gas Leak Sensor
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Air freight costs are based on the weight of the product (including packaging bags and cushioning materials). For products under 2kg, freight is calculated in 50g increments. For products between 2kg and 4kg, freight is calculated in 100g increments. For products over 4kg, freight is calculated in 1kg increments.
If your order exceeds 4kg or the shipping cost exceeds $70, we recommend contacting our customer service for an accurate shipping quote. You will need to provide your zip code address when you contact us.
Air freight options include DHL, UPS, FedEx, and Yun Express, with a delivery time of 7-12 days.
When the weight of the express delivery exceeds 12kg or air shipping cost exceeds US$100 or sea shipping cost exceeds US$50, you can choose B2B shipping:
Air freight(10-14 days)
Yun quik boat sea freight (15-20 days)
Quik boat sea freight(20-25 days).
Air freight B2B express |
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| US Area | Unit Price | Date | Last-mile Delivery |
| Western United States (zip codes starting with 8 or 9) |
US$7.5/kg + US$2 | 10-15 days | UPS / FEDEX / GOFO |
| Central United States (zip codes starting with 4, 5, 6, or 7) |
US$8.5/kg + US$2 | ||
| Eastern United States (zip codes starting with 0, 1, 2, or 3) |
US$9.0/kg + US$2 | ||
Yun quit boat sea freight B2B express |
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| US Area | Unit Price | Date | Last-mile Delivery |
| Western United States (zip codes starting with 8 or 9) |
US$3.4/kg + US$2 | 15-20 days | UPS / FEDEX / GOFO |
| Central United States (zip codes starting with 4, 5, 6, or 7) |
US$3.6/kg + US$2 | ||
| Eastern United States (zip codes starting with 0, 1, 2, or 3) |
US$3.8/kg + US$2 | ||
Quit boat sea freight B2B express |
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| US Area | Unit Price | Date | Last-mile Delivery |
| Western United States (zip codes starting with 8 or 9) |
US$2.6/kg + US$2 | 20-25 days | UPS / FEDEX / GOFO |
| Central United States (zip codes starting with 4, 5, 6, or 7) |
US$2.8/kg + US$2 | ||
| Eastern United States (zip codes starting with 0, 1, 2, or 3) |
US$3.0/kg + US$2 | ||
Processing starts after your payment confirmed. Normally, it needs 2-5 days. The processing time depends on the quantity of items.
The MQ-7 gas sensor uses tin dioxide (SnO2), a gas-sensitive material with low conductivity in clean air. It employs a high-low temperature cycling detection method. At low temperature (1.5V heating), carbon monoxide is detected; the sensor's conductivity increases with increasing carbon monoxide concentration in the air. At high temperature (5.0V heating), stray gases adsorbed during the low-temperature process are removed. A simple circuit converts the change in conductivity into an output signal corresponding to the gas concentration. The MQ-7 gas sensor has high sensitivity to carbon monoxide and can detect various carbon monoxide-containing gases, making it a low-cost sensor suitable for a variety of applications.
Carbon monoxide detection concentration: 10-1000 PPM
Module Features:
1. High-quality double-sided panel design with power indicator and TTL signal output indication;
2. DO switch signal (TTL) output and AO analog signal output;
3. TTL output valid signal is low level. (The indicator light illuminates when the output is low, allowing direct connection to a microcontroller or relay module.)
4. Analog output voltage; the higher the concentration, the higher the voltage.
5. Good sensitivity for carbon monoxide detection.
6. Four screw holes for easy positioning;
7. Product dimensions: 32(L)*20(W)*22(H) mm
8. Long service life and reliable stability
9. Fast response and recovery characteristics
Electrical performance:
Input voltage: DC5V
Power consumption (current): 150mA
DO output: TTL digital 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively pollution-free), maximum concentration voltage around 4V
Special reminder: After the sensor is powered on, it needs to warm up for about 20 seconds for the measured data to stabilize. Sensor heating is normal because of the internal heating wire; if it gets too hot to touch, it is abnormal.