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MQ-9 Carbon Monoxide CO Gas Alarm Sensor For Arduino Detection Module

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In stock
Sale Price: US $1.32
45 days Money back
45 days Money back Returns accepted if product not as described, buyer pays return shipping; or keep the product & agree refund with seller.
On-time Delivery
On-time Delivery
Guarantees: On-time Delivery 60 days


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* Item Description

MQ-9 Carbon Monoxide CO Gas Alarm Sensor For Arduino Detection Module

Module application:

Can be used for the family and the factory’s gas leakage monitoring device, suitable for liquefied gas, propane, propane, methane, smoke and other detection

Module Features:
1, using high-quality dual-panel design, with power indicator and TTL signal output indication

2, with a DO switch signal (TTL) output and analog output AO

3, TTL output valid signal is low. (When the output low signal light, can be directly connected microcontroller or relay module)
4, analog output voltage with higher concentration the higher the voltage.

5, liquefied petroleum gas, natural gas, city gas, smoke have better sensitivity.
6, there are four screw holes for easy positioning

7. Product dimensions: 32 (L) * 20 (W) * 22 (H)
8, with a long life and reliable stability

9, rapid response recovery characteristics

Electrical performance:
Input voltage: DC5V
Power (current): 150mA
DO output: TTL digital 0 and 1 (0.1 and 5V)
AO Output: about 0.1-0.3V (relatively clean), the highest concentration voltage 4V
Special note: After the sensor is powered, needs to warm up about 20S, measured data becomes stable, sensor fever is a normal phenomenon, because the inside with an electric wire, if not normal hot.

For more quantity, Please contact us


  1. Orders will be shipped within 1-2 business days after the payment verification.
  2. SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays.Transit times may vary,particularly during the holiday season.
  3. Items will be marked as ” Gift ” in low value.
  4. Delivery time (Business days): Pls provide P.O. Boxes or Zip Codes Address.
    Country Approx. Delivery time

    Hong Kong Post Air-Mail

    United States, United Kingdom, Australia 7-14 working days
    Canada, Western Europe, Northern Europe, Central Europe 7-21 working days
    Other Country 15-30 working days
    UPS or DHL North America, Australia, Western Europe, Northern Europe, Central Europe 3-7 working days
    Other Country 5-10 working days


  1. You have 7 days to contact us and 30 days to return it from the date it was received.
  2. If you have not received your shipment within 30 days from payment,please contact us.We will track the shipment and get back to you as soon as possible with a reply.Our goal is customer satisfaction!
  3. Both Replacement and Money Return are accept. Return shipping fee afford with buyer.


  1. 12 months Manufacturer’s limited warranty for defective items(excluding Man-made damage).Accessories come with a 3-month warranty.
  2. Defective item MUST BE reported and returned within the warranty period.


  1. We maintain high standards of excellence and strive for 100% customer satisfaction. Feedback is very important,We hope you can contact us immediately before you give us neutral or negative feedback.
  2. If you have any questions, our Customer Service staffs welcome you to email or call us. We strive to answer all questions and resolve any problems as quickly as possible

–wish you have a happy shopping , welcome to the next visit–

Average Star Rating:
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Name Rating Feedback
Shipping Company Shipping Cost Estimated Delivery Time
DHL 3 - 7 days
UPS Expedited 3 - 7 days
EMS 5 - 14 days
Post Air Mail Free Shipping 15 - 45 days
Return Policy If the product you receive is not as described or low quality, the seller promises that you may return it before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe) and receive a full refund. The return shipping fee will be paid by you. Or, you can choose to keep the product and agree the refund amount directly with the seller.

N.B.: If the seller provides the "Longer Protection" service on this product, you may ask for refund up to 15 days after order completion.
Seller Service On-time DeliveryIf you do not receive your purchase within 60 days, you can ask for a full refund before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe).

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Price:  US $1.32 / piece