MH-Z19 MH-Z19C IR Infrared CO2 Sensor Module Carbon Dioxide Gas Sensor-ca

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eBay If you need documents about this product, please contact us. Thank you The MH-Z19C carbon dioxide gas sensor (hereinafter referred to as the sensor) is a general-purpose intelligent small sensor that uses the principle of non-dispersive infrared (NDIR) to detect the presence of C02 in the air. And other features; built-in temperature compensation: simultaneously has serial output, PWM output, easy to use. The sensor is a high-performance sensor made by closely combining mature infrared absorption gas detection technology with sophisticated optical circuit design and sophisticated circuit design. Product parameters: Detection gas: carbon dioxide Power supply voltage: DC (5.0 ± 0.1) V Average current: <40mA (@5V power supply) Peak current: 125 to (@5V power supply) Interface level: 3. 3v (compatible with 5v) Measuring range: 400-5000PPM optional Output signal: serial UART (TL level 3.3V) Warm-up time: 1min Response time: T90< 120s Working temperature: -10-50degree Working humidity: 0~95%RH (no condensation) Pin description: Vin: Power +(in) GND: power supply-(GND) PWM: PWM Hd: HD (zero calibration, low level is effective for more than 7 seconds) Rx: UART (RXD) TTL level data input Tx: UART (TXD) TTL level data output Output method: PWM output Assume the measurement range is 400-2000ppm CO2: Concentration output range: 400-2000ppm Period: 1004ms±5% High level output at the beginning of the cycle: 2ms (theoretical value) Central period: 1000ms±5% Low level output at the end of the period: 2ms (theoretical value) Calculation formula for obtaining current CO2 concentration value by PWM: Cppm=2000X (TH-2ms)/(TH+TL-4ms) Cppm: CO2 concentration value calculated by the unit of ppm TH: the time when the output is high level in one output cycle TL: the time when the output is low in one output cycle 1. We only accept payment via PayPal, other payment is not acceptable. 2. If you don’t have PayPal account, please register through https://www.paypal.com before you bid our items. 3. Please make sure your shipping address is the same of your eBay address before you pay. We will not be responsible for such a case if you change you shipping address as we have shipped your items out. 1. We only ship to confirmed eBay address, your eBay address must match your Shipping address. 2. All items are available for shipping within 1-10 business days after receiving the payment. Please be aware that weekends are not business days. 3. Any non-received items caused by invalid address registered on PayPal are not in our full refund or replacement policy. Shipping fee has including the local handing and packaging fee. 4. We are unable to take any responsibility for any custom delay or tax, Reason is because transit time is highly depended and provided by postal Service( Except weekends and holidays.) 1. If you are not satisfied with the item, please return it within 7 days for a replacement or money back. Please contact me before you return it. We are 100% Satisfaction Guarantee to our customers. 2. All returned items MUST BE in the original packaging with all components and accessories included, And you MUST provide us the return shipping information The shipment or the tracking number）. 3. Returned shipping fee is to be paid by the buyers. We will not responsible for any custom duty or import tax. Thank you for your understanding. Our working time: Beijing time : Monday to Saturday 8:30 am to 5:30 pm. If you send email to us,In our working hours will be resumed within 24 hours. If you we are not satisfied with the product or service ,please contact me and don't give us negative or natural feedback,We must give you a satisfactory solution. I hope all of us try together to create a better environment for ebay shopping !! On 28-Nov-2023 at 00:22:25 EST, seller added the following information:

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