Do you know a carbon monoxide alarm?

Carbon monoxide alarms can be divided into household carbon monoxide alarms and industrial carbon monoxide alarms according to the direction of use, and can be divided into wall-mounted/fixed carbon monoxide alarms and portable carbon monoxide alarms according to the way of use. instrument.

Overview Instructions:
Carbon monoxide (CO) gas is a colorless, odorless, non-irritating, poisonous gas that cannot be sensed by the five senses. It can inhibit the oxygen-carrying capacity of the blood. The toxicity of carbon monoxide mainly affects the supply and utilization of oxygen. The affinity of carbon monoxide and red blood cells is more than 300 times greater than that of oxygen and red blood cells, resulting in tissue hypoxia. When carbon monoxide gas is inhaled, carbon monoxide enters the lungs and combines with red blood cells first, causing red blood cells to lose the ability to transport oxygen, causing hypoxia in many organs of the human body, resulting in tissue damage and even death. Ordinary people are unable to perceive themselves when accidentally poisoned, and are often found in a coma, causing serious injury or even death. Therefore, it is not too much to call it the "invisible killer" in the family.

Production of carbon monoxide:
Carbon monoxide is produced by insufficient combustion of fuels (such as gasoline, diesel, coal, charcoal, coal gas, liquefied gas, natural gas, etc.). Main causes of carbon monoxide generation in homes: incomplete combustion of natural gas, coal gas, liquefied gas, fuel oil, and coal; improper installation of water heaters, backflow of exhaust gas; blockage of chimneys and exhaust pipes; Engines, closed doors and windows in winter and heated stoves, etc.

The carbon monoxide alarm is converted into an electrical signal by sensing the concentration of carbon monoxide gas in the air through a carbon monoxide sensor, and the magnitude of the electrical signal is related to the concentration of carbon monoxide. Carbon monoxide alarms are classified according to the sensors used, generally divided into semiconductor carbon monoxide alarms, electrochemical carbon monoxide alarms, infrared carbon monoxide detectors, etc. In terms of measurement sensitivity, accuracy, stability, and resistance to cross-gas interference, the performance is the best. It is an infrared carbon monoxide detector, but it is more expensive and suitable for laboratory use. Civilian carbon monoxide alarms are generally semiconductor and electrochemical.

The semiconductor carbon monoxide alarm uses a semiconductor carbon monoxide sensor as a sensitive element, and it is required that the sensitive element can respond quickly when the temperature is about 200 °C, so it is necessary to add heating wire heating, so it needs to provide a relatively large current. Large changes are not good for its accurate measurement, and it is easy to be cross-interferenced by other gases, such as alcohol, nitrogen oxides, hydrogen, alkanes and other gases, which are prone to false alarms, but they are cheap. The general service life is up to five years.

Electrochemical carbon monoxide alarms use zero-power electrochemical carbon monoxide sensors as sensitive components, most of which use the principle of constant-potential electrolysis in electrochemical methods, and use constant-potential electrolysis to perform redox electrochemical reactions and detect diffusion current to obtain carbon monoxide. Gas concentration, and has a good linear measurement range and high selectivity, strong resistance to cross-gas interference, and the price is relatively expensive. The electrochemical carbon monoxide sensor has zero power consumption and does not require heating. It is very suitable for battery-powered detection circuits with low power consumption to make carbon monoxide concentration meters, portable carbon monoxide alarms, etc. The long-term exposure of electrochemical carbon monoxide sensors to irritating solvents such as oxygen-free gas samples, alcohol, and paint will affect its sensitivity and life, or even fail. The use of electrochemical carbon monoxide sensors in the air is generally three years, there are also five years, and the longer can be more than eight years.