Tuya WI-FI Smart Co2 Meter Box Accurate Real Time Indoor Smoke Alarm Detector for Ventilatie Corona Safety Carbon Dioxide Sensor

Good luck with your favorite purchases This product uses MH-Z19C carbon dioxide gas sensor and AHT20 temperature and humidity sensor. MH-Z19C is a universal intelligent small sensor, which uses the principle of non-dispersive infrared (NDIR) to detect CO2 in the air. It has the characteristics of good selectivity, no oxygen dependence, long life and built-in temperature compensation. The sensor is a high-performance sensor which combines the mature infrared absorption gas detection technology with the precise optical circuit design and excellent circuit design. AHT20 is equipped with a newly designed ASIC chip, an improved MEMS semiconductor capacitive humidity sensor and a standard on-chip temperature sensor. Its performance has been greatly improved and even exceeded the reliability level of the previous generation sensor. The new generation temperature and humidity sensor has been improved to make its performance more stable in harsh environment. Each sensor has been calibrated and tested, and is widely used in homes, hotels, offices and other places.

Q&AQuestion:Why these carbon dioxide detector can only detect carbon dioxide concentration above 400ppm?Answer:Because this co2 meter only suitable for indoor carbon dioxide concentration detection.As we all know co2 is an important part of the air. Main function of the product is to alarm when the carbon dioxide concentration exceeds the standard,such as when indoor people are crowded or room closed for a long time without ventilation. So this indoor carbon dioxide detector with a co2 detection starting concentration of 40  Question:Does it include usb cable? Answer :Our product package includes 1x CO2 Detector, 1x USB Charging Cable, 1x User Manual. Question:How often are you supposed to calibrate this?Readings seem irraticAnswer:Calibrate when you think the device reading is inaccurate.We recommend that you calibrate your device when you first receive it. Question:Does it have a "hold" function? So can you put it into an environment, leave it for a period of time, and it stores or fixes the reading?Answer : place the detector in an open environment, such as outdoors. In the startup state, press and hold the K1 and K2 buttons at the same time, and the detector will enter the calibration state. After 200s of calibration, the actual detection value will be displayed. At present, the CO2 detector does not have the function of storing data Question:Does an audible alarm sound if/when co2 levels become dangerous?Answer:Have alarm sound. When carbon dioxide levels exceed normal,it will have sound to remind you .