Chip: LM393, ZYMQ-2 Gas Sensors.
Working Voltage: 5V DC.
Current: 150 mA.
Pin Definition: 1-Output, 2-GND, 3-VCC.
Dual Signal output: Analog output and TTL level output.
DO Output: TTL digital quantity 0 and 1 (0.1 and 5V).
AO output: 0.1-0.3v (relatively pollution-free), the highest concentration voltage is about 4V.
Gas Detection: LPG, i-butane, propane, methane, alcohol, hydrogen and smoke.
The MQ2 sensor is used to detect combustible and harmful gases for consumer and industrial applications, the gases this sensor can detect are: LPG, i-butane, propane, methane, alcohol, hydrogen and smoke, these gases are not only highly combustible but also harmful.
The sensitivity of MQ2 sensor can be adjusted to suit the requirements of the application via a manual potentiometer located on the back of the sensor.
The output voltage from the Gas sensor increases when the concentration of gas increases.
Special reminder: After the sensor is powered on, it needs to preheat 20S or so, and the measured data is stable. The sensor heating is a normal phenomenon, because there is a heating wire inside, it is abnormal if it is hot.
Mhenga.com returns submitted in-store or by mail are refunded to your original method of payment. Outbound shipping charges are not always refunded upon return, this can include regular and freight shipping, and any shipping surcharges.
Debit and credit card refunds may take up to 10 business days depending on your financial institution
Pay with Cash orders are refunded in-store only; if your Pay with Cash order is canceled, you will receive an email once your refund is ready; please bring this email with you to collect your refund
Store Returns with a Receipt
If your purchase was made using a credit card, any refund is required to be issued to that same credit card. If the original credit card is not present and is not available by scanning the receipt, the refund will be processed onto a Walmart shopping card or gift card
If your purchase was a debit transaction, the refund is placed back on the debit card, if available, or cash can be provided
Store Returns without a Receipt
If you do not have your receipt, we will accept your return or exchange if it falls into the following guidelines:
You are required to present a valid, government-issued, photo ID that has not been altered in any way. Information from your ID is stored in a secured database of returns activity that Walmart uses to authorize returns.
The refund verification process accepts the return. If an item is returned without a receipt and the refund verification process accepts it, the following options are available:
If available, you may send the merchandise to the manufacturer for repair
The merchandise may be exchanged for another item
The merchandise may be returned and a cash refund provided if the refund value of the returned item is less than Ksh 1,000
The merchandise will be returned and a Walmart shopping card or gift card is provided if the refund value of the returned merchandise is equal to or greater than Ksh 1,000
Express Delivery Nairobi Area
We recognize the trust you place in us when we deliver to your doorstep, shipping dock or place of business. That’s why we want to keep you informed on the actions we are taking to keep you – and our team members – safe amidst the COVID-19 outbreak.
You will receive your good the second day at a central location in your area at only Ksh 99. We use pickup mtaani for delivery.
You will recieve your good the second day, we use different courier services, incase of an emergency or a different preferred method, call us and we shall organize for that.