Carbon monoxide meter (CO) is a tasteless, odorless gas that is produced by partially burned carbon fuels like natural gas, wood, coal, petrol and diesel. It is dangerous in confined spaces where proper ventilation isn’t available and is responsible for hundreds of fatal poisonings every year. CO detectors alert occupants to unsafe levels of the gas by emitting an audible alarm.
Silent Threats Unveiled: The Importance of Carbon Monoxide Meters in Home Safety
Detectors work by sampling air for carbon monoxide molecules and comparing the results to set concentration limits. The most common type uses an electrochemical sensor composed of electrodes submerged in an electrically conductive solution that is activated by carbon monoxide. As the gas enters the gas-permeable compartment, its chemical interaction with the electrodes increases the current passing through the solution and creates an electronic signal that is proportional to the concentration of carbon monoxide in the air. A microprocessor interprets the signal to determine the level of CO and triggers an alarm if the limit is reached.
Some models also use metal oxide sensors layered on an insulating ceramic base and monitored by integrated circuitry. When exposed to CO, the tin dioxide in the sensor’s layer reduces its resistance and a circuit monitors that change. They are more accurate and less susceptible to interference from environmental factors like humidity.
Both types of CO detectors need to be placed five feet above the floor and away from fireplaces and other flame-producing appliances to avoid false readings. They should be tested regularly and batteries replaced as needed. Portable meters that display CO concentration down to a few parts per million are useful for industrial hygienists and first responders to help track leaks and pinpoint their source.