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Description

The base is suitable for the full range of MQ sensors

MQ-131 ozone sensor and oxygen sensor module

Specific parameters：

Dimensions: 32mm X22mm X27mm (length X width X height)

Main chips: LM393, MQ-131 gas sensor

Working voltage: 5V DC

Features：

1. It is equipped with a signal output indicator light for indication.

2. Dual signal output (analog output and TTL level output);

3. The TTL output valid signal is at a low level. When the output level is low, the signal light is on and it can be connected to the IO port of a single-chip microcomputer.

4. The analog output increases with the increase of concentration, and the higher the concentration, the higher the voltage.

5. It has a very high sensitivity to ozone gas (detection concentration range: 10PPB-2PPM)

6. It has a long service life and reliable stability;

7. Fast response and recovery feature;

8. Equipped with installation holes for convenient fixed installation;

9. The probe is designed to be plug-and-pull, which is convenient for experiments.

Application:

Ozone gas detection devices for household and atmospheric environments

MQ-136 Hydrogen sulfide detection Sensor module

Product Introduction:

The analog output voltage is 0 to 5V. The higher the concentration, the higher the voltage.

It has good sensitivity to hydrogen sulfide, liquefied gas, natural gas, city gas and smoke.

It has a long service life and reliable stability

Fast response and recovery feature

Application:

Gas leakage monitoring devices suitable for households or factories, and applicable to monitoring devices for liquefied gas, butane, propane, methane, alcohol, hydrogen, smoke, etc.

Applicable occasions: Single-chip microcomputer learning, electronic competitions, product development, graduation design...

MQ137

Product features:

The gas-sensitive material used in the MQ137 gas sensor is tin dioxide (SnO2), which has a relatively low electrical conductivity in clean air. When ammonia gas is present in the environment where the sensor is located, the conductivity of the sensor increases with the increase of ammonia gas concentration in the air. The change in electrical conductivity can be converted into an output signal corresponding to the concentration of the gas using a simple circuit. The MQ137 gas sensor has a high sensitivity to ammonia and is also ideal for monitoring other organic amines such as trimethylamine and ethanolamine. This sensor can detect various ammonia-containing gases and is a low-cost sensor suitable for a wide range of applications.

MQ138

The formaldehyde gas sensor detection module outputs TTL level signals (which can be connected to the IO port of a single-chip microcomputer such as 51, etc.) and voltage analog signals. Additionally, the module can detect aldehydes, benzene, aromas, ketones, etc. The error and consistency of the detection data belong to the medium and low-end level. It is applied to qualitative judgment and non-affirmative quantitative detection. The cross-data interference caused by VOC and TVOC gases is relatively obvious.

Application:

Volatile substance detection devices for household and environmental use, suitable for the detection of aldehydes, alcohols, ketones, aromatic compounds, and concentration testing of gas-sensitive components

MQ139

A Freon gas detection device for household and environmental use, suitable for the detection of R11, R22, R113, R134, R409A, R410A, etc. The test concentration range of gas-sensitive components: R134A 10 to 1000pp

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Delivery Policy

Delivery Policy – BILLIONS BIRDS

At BILLIONS BIRDS, we are dedicated to delivering your orders safely and efficiently.

1. Order Processing

All orders are processed within 1–3 business days after payment confirmation. Orders are not processed or shipped on weekends or public holidays.

2. Shipping Times

Estimated delivery times vary depending on your location:

Domestic Shipping: 3–7 business days

International Shipping: 7–15 business days

Please note that delivery times are estimates and may vary due to customs procedures, carrier delays, weather conditions, or other unforeseen circumstances.

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Shipping fees are calculated at checkout based on your location and selected shipping method. Any customs duties, taxes, or import fees are the customer's responsibility.

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If your order is delayed, lost, or arrives damaged, please contact us within 7 days of the expected delivery date. We will work with the shipping carrier to resolve the issue as quickly as possible.

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Customers are responsible for providing accurate shipping details at checkout. BILLIONS BIRDS is not responsible for orders shipped to incorrect addresses provided by the customer.

Refund Policy

Refund Policy – BILLIONS BIRDS

At BILLIONS BIRDS, customer satisfaction is our top priority. If you are not completely satisfied with your purchase, we’re here to help.

1. Return Eligibility

You may request a return within 14 days of receiving your order. To qualify for a return:

The item must be unused, unworn, and in the same condition as received.

The item must be in its original packaging.

Proof of purchase (order confirmation or receipt) is required.

Certain items may not be eligible for return, including clearance items, gift cards, or personalised/custom products.

2. Non-Refundable Items

The following items are non-refundable:

Final sale or discounted items

Gift cards

Items damaged due to misuse, negligence, or improper care

3. Return Process

To initiate a return, please contact our customer support team with your order number and reason for return. If your return is approved, you will receive instructions for returning the item.

Unless the item is defective or incorrect, customers are responsible for return shipping costs.

4. Refund Processing

Once we receive and inspect your returned item:

We will notify you of the approval or rejection of your refund.

If approved, the refund will be issued to your original payment method within 5–10 business days.

Please note that banks or payment providers may require additional time to process refunds.

5. Damaged or Incorrect Items

If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery and provide clear photos of the product and packaging. We will arrange a replacement or full refund at no additional cost.

6. Late or Missing Refunds

If you have not received your refund:

Check your bank account again.

Contact your credit card company or payment provider.

If the issue persists, don't hesitate to contact our support team for assistance.