MQ-9 Carbon Monoxide, Methane and LPG Gas Sensor Module

MQ-9 Carbon Monoxide, Methane and LPG Gas Sensor Module

The MQ-9 gas sensor module has high sensitivity to Carbon Monoxide, Methane, and LPG. The sensitive material used in the MQ-9 gas sensor is SnO₂, which has lower conductivity in clean air. It detects gases by cycling high and low temperatures: at low temperatures (heated by 1.5V), it detects CO; at high temperatures (heated by 5.0V), it detects Methane, Propane, and other combustible gases while cleaning out previously adsorbed gases. MQ-9 is commonly applied in domestic gas leakage detectors, industrial gas detectors, and portable gas detectors.

Wire Connecting Method of MQ-9 Gas Sensor Module:-

• VCC: Positive pole (5V)

• GND: Negative pole

• DO: TTL switch signal output

• AO: Analog signal output

Specifications of MQ-9 Gas Sensor Module:-

• Input Voltage: DC 5V

• Power: 150mA

• DO Output: TTL digital 0 and 1 (0.1V and 5V)

• AO Output: 0.1–0.3V (relatively clean); highest concentration voltage is about 4V

Features of MQ-9 Gas Sensor Module:-

• Suitable for home or factory gas leakage monitoring devices

• Better sensitivity to Carbon Monoxide, Methane, and LPG

• High-quality dual-panel design with power indicator and TTL signal output instructions

• DO (TTL) output and AO (analog) signal output

• TTL output valid signal is LOW (can directly trigger microcontroller or relay module)

• Analog output voltage increases with gas concentration

• Four screw holes for easy mounting

• Long life, stable operation, fast response and recovery

Return Policy Overview

At ROBODIUM™, we want you to be completely satisfied with your purchase. You may return most items within 7 days of delivery for a full refund or exchange.

Return Window

• Standard Returns: 7 days from delivery date for any reason, including if you simply changed your mind.
• Defective/Damaged Items: 7 days from delivery date for items received damaged or defective.
• Manufacturing Defects (Warranty): 15 days from delivery for manufacturing defects, unless a different warranty period is specified on the product page.

What Can Be Returned

Most items sold on ROBODIUM™ can be returned within the return window, including:

• Items you no longer need or changed your mind about
• Products received in damaged condition
• Items with manufacturing defects
• Wrong items received (item mismatch)
• Missing components inside the package

Return Conditions

To be eligible for a return, items must be:

• In their original, unused condition
• In the original packaging with all accessories, manuals, and free gifts (if any)
• Accompanied by proof of purchase

Note: Products damaged due to misuse, modification, static discharge, soldering, or improper handling may not be eligible for return.

How to Initiate a Return

1. Contact us via email at support@robodium.com or call +91 8123109966
2. Provide your order number and reason for return
3. Submit photos/videos of the item (especially for damaged/defective products)
4. Our team will review and approve your return request within 1-2 business days

Return Pickup Process

We arrange the return pickup for you - hassle-free returns similar to major e-commerce platforms.

• Once your return is approved, we will coordinate pickup from your location.
• Pack the product securely in its original packaging.
• Include a copy of the order confirmation or packing list.
• Keep the package ready - our logistics partner will collect it at the scheduled time.

Return Shipping Costs

• Defective, damaged, or wrong items: ROBODIUM™ covers all return shipping costs. No charges to you.
• Change of mind returns: A flat return shipping fee of ₹100 will be deducted from your refund amount.

Refund Process

• Refund Method: Refunds are processed to your original payment method.
• Processing Time: 5-7 business days after we receive and inspect the returned item.
• Refund Amount: Full purchase price minus any applicable return shipping fees.
• Orders canceled before shipping receive a full refund (minus up to 5% payment gateway charges, if applicable).

Replacements

• Once the returned item is inspected and approved, we ship the replacement at no additional cost.
• Replacement items are dispatched within 2 business days of receiving your return.
• If replacement is unavailable, we provide a full refund.

Warranty Terms

All products include a minimum 15-day warranty against manufacturing defects unless otherwise specified on the product page.

Warranty does not cover: misuse, soldering damage, modifications, physical damage, or incorrect electrical connections.

Order Cancellations

• Orders in Pending or Payment Verification status can be canceled for a full refund.
• Contact us immediately at support@robodium.com to cancel before shipping.
• Once an order is shipped, it cannot be canceled but can be returned after delivery.

Customer Service Commitment

• Email Response Time: Within 24 hours on business days
• Phone Support: Monday-Saturday, 10:00 AM - 6:00 PM IST
• Return Request Review: 1-2 business days
• Issue Resolution: Within 48 hours of verification