Home gas detectors work by using specialized sensors (like electrochemical, catalytic, or infrared) to sample the air, reacting to combustible or toxic gases (like methane, propane, or carbon monoxide) and converting that reaction into an electrical signal that triggers loud alarms and lights when gas levels exceed a safe threshold, protecting homes from leaks. Different types of sensors detect different gases, but all follow the basic principle of sensing a chemical change in the air to provide an early warning.
Catalytic and infrared sensors are able to detect combustible gases, and are more commonly used in everyday life. Catalytic sensors are triggered when a combustible gas touches a catalytic surface. A resistance change occurs due to heat and an alarm is set off.
Electrochemical. Electrochemical gas detectors work by allowing gases to diffuse through a porous membrane to an electrode where it is either chemically oxidized or reduced. The amount of current produced is determined by how much of the gas is oxidized at the electrode, indicating the concentration of the gas.
Excessive combustible gas concentrations: When a detector detects combustible gases such as methane and propane, and the concentration reaches the preset alarm threshold (usually divided into low and high levels), it will continuously sound an alarm, indicating the presence of an explosion or combustion hazard.
Natural gas detectors can alert you and your family of odorless and dangerous leaks. They may not be as common on the list of must haves for the home such as a smoke detector or fire extinguisher, but these devices are worth serious consideration and can detect potentially serious situations.
Some manufacturers recommend placing the detectors 4-12 inches away from the ceiling and within 3-10 feet away, measured horizontally from the gas appliance. It's recommended that the detector be installed at least 5 feet away from cooking appliances or hoods.
Inhaling leaked gas in an indoor space, such as your home can result in a lack of oxygen in the air and lead to hypoxia. That can, in turn, lead to severe headaches, fatigue, decreased vision, short breaths, and even loss of consciousness.
Look for water near where the detection is installed. Sudden changes in the air may even cause the readings to fluctuate during operation. Electromagnetic interference (EMI) from radio frequencies, such as cellphone towers and communication networks, can trigger false positives by making the sensor more sensitive.
It is also a good idea to know the signs of a potential CO problem:
What Are the Types of Gas Detectors?
Large gas leaks in pipes or appliances may produce hissing noises, even if the appliance is turned off. Check pipes and appliances regularly, listening for any hissing noises. Air bubbles outside your home. Natural gas leaks can also occur in underground piping outside the home.
High gas exposure will change the calibration curve of the sensors causing false or inaccurate readings. Extremely high concentrations can kill the sensor's ability to measure gas. Further, many sensors can fail but not provide a warning that they have failed.
Call the gas company in your area if you smell it again. They are much better at finding small leaks than we are. If you just have a faint smell of gas every once in a while no need to panic it's probably just a small leak. Gas company should be able to track it down and either repair it or do a temporary fix.
Calibration failure: If the gas detector is not calibrated correctly, or if the calibration is out of date, it may lead to false alarms. Temperature and humidity changes: Some gas detectors are sensitive to environmental conditions, and changes in temperature and humidity may cause a continuous alarm.
NFPA 715 does not require that fuel gas detection be provided; instead, NFPA 715 is a standard that is used when designing a fuel gas warning system or when placing single and multiple stations when required by other building or fire codes.
Expired Sensors: Sensors typically last two to three years. If calibration fails, check whether a sensor replacement is needed. Incorrect Calibration Gas: Ensure you're using the correct gas type and concentration, and that it's within the expiration date, as expired gas can lead to inaccurate readings.
Carbon monoxide (CO) is a gas that can kill you quickly. It is called the “silent killer” because it is colorless, odorless, tasteless and non- irritating.
One of the most common sources of exposure in the home is the gas or kerosene-powered heater. Gas-powered water heaters, stoves, and furnaces may also produce carbon monoxide.
The Carbon Monoxide Detection Systems Checklist mobile app inspects Carbon Monoxide Detection Systems using an iPad, iPhone, Android device, or a Windows desktop.
However, if small gas leaks are present and there is no ignition source, they can cause a variety of health problems for people and pets, even leading to death by asphyxiation.
To aid detection, utility companies add a substance called mercaptan, creating a distinct odor reminiscent of rotten eggs or sulfur. If you detect this smell, evacuate the building immediately. Hissing or Whistling Sounds: Gas escaping a pipe under pressure often creates a hissing or whistling sound.
How long does it take to get carbon monoxide poisoning? In high concentrations of carbon monoxide, it can take fewer than five minutes to get carbon monoxide poisoning. Under lower concentrations, it can take an hour to two hours to cause poisoning.
Do not open windows and doors if you smell gas outside your home. Natural gas is lighter than air, so opening windows and doors will diffuse the gas to outside of your home. DO NOT use any open flame nor touch any switches, including exhaust fan, kitchen fan, and light switches.
Think you smell natural gas?