HOME » QUESTION » The display number range of Carbon Monoxide HM-733ESY is 10-999 ppm,is there conflict with the description of notification when the concentration of CO is over 20ppm?

Q：The display number range of Carbon Monoxide HM-733ESY is 10-999 ppm,is there conflict with the description of notification when the concentration of CO is over 20ppm?

A：

There is no conflict. When the concentration reaches 10ppm, the concentration value starts to be displayed on the LCD, but the indicator light is a normal green light. Then, when it exceeds 20ppm for 35 minutes, the LED starts to flash a red light and gives a beep as a prompt.