Carbon monoxide expert , we have been engaged in the field of security for more than ten years. Now we will share experience and personal opinions with readers by writing articles, hoping to help readers.

Table of Contents

Reliable Tips on Combined Smoke and Carbon Monoxide Detectors

Share on facebook
Share on twitter
Share on linkedin

Carbon monoxide detector is used to monitor the concentration of carbon monoxide in the air to prevent carbon monoxide poisoning; The smoke detector mainly realizes fire prevention by monitoring the concentration of smoke. Combined carbon monoxide and smoke detectors can monitor both carbon monoxide concentration and smoke concentration, which greatly reduces the incidence of accidents in public places and home.

Type of smoke detectors

No matter how many kinds of carbon monoxide detectors are, their detection range is only carbon monoxide gas; There are many kinds of smoke detectors, and the detection range is different. Therefore, before explaining the necessity of installing combined detectors, we must first understand the type and detection range of smoke alarm.

Smoke alarms are mainly divided into three categories:

Ionization smoke detector: suitable for detecting small particles and flare in fast burning fires. However, the ionization device is prone to false alarm due to food charring and steam, so it is best not to install this detector near the kitchen or bathroom;

Photoelectric smoke detector: suitable for detecting large particle smoke and smoldering objects. However, they perform poorly in detecting fast burning objects. Different from ionization smoke detector, The probability of false alarm of photoelectric smoke detector is very low and it can be installed in kitchen, bathroom and other areas;

Dual sensor smoke detector: The detector combines photoelectric and ionization technology. It can detect flare and smoldering at the same time without installing independent photoelectric and ionization smoke detectors. It saves installation space and is very suitable for families to buy.

Dual sensor smoke detector can effectively detect flare and smolder to prevent fire, but there is also an “invisible killer” at home: carbon monoxide, which can make people die in their deep sleep. Therefore, if smoke detector and carbon monoxide detector are installed at home at the same time, it can not only prevent fire at home, but also protect the life safety of family members. Therefore, a combined smoke and carbon monoxide detector was born.

Characteristics of combined smoke and carbon monoxide detectors

Anti false alarm: the combined detector can identify the threat from smoke and gas, some accurate detectors can even be free from heat interference. It provide timely alarm for various types of fire, and maintain immunity to most false alarm sources (such as steam, insect intrusion and dirt accumulation);

Higher accuracy: the propagation speed of gas in the air is about 300m / s, the propagation speed of smoke in the horizontal direction is about 0.8 ~ 1m / s, and the speed in the vertical direction is about 3 ~ 4m / s. Therefore, before the fire, the gas will come out earlier than the smoke. The carbon monoxide detector first detects the gas and triggers the alarm, which improves the detection accuracy;

Optimal cost: if you want to have both carbon monoxide detector and smoke detector without taking up too much space, it is the best choice for you to buy a smoke detector and carbon monoxide detector;

These are the advantages of smoke and carbon monoxide detectors, but its disadvantage is that the installation will be limited. The installation position of carbon monoxide is on the wall 1 meter away from the ceiling, while the installation position of smoke detector is on the ceiling. At the same time, the detector is inconvenient to carry and the cost is high.


The installation locations of combined detectors of different brands are different, and they need to be installed according to the manufacturer’s instructions. Since smoke and carbon monoxide are rising, the combined detector shall be installed on the ceiling or on the wall at a 12-feet distance from the ceiling. Locations include:

  • Every floor of the house
  • Each bedroom (if the number of detector is large)
  • Corridor close to sleeping area (if the corridor is longer than 40 feet, install detectors at both ends)
  • At the top of the stairs leading upstairs
  • Living area
  • At least 10 feet from the furnace or furnace

What should I do when the alarm is triggered

  • Leave home immediately
  • Make sure all family members are out
  • Make an alarm call in a safe location
  • Stay away from the house until professionals tell you you can return home

Factors to consider when purchasing combined smoke and carbon monoxide detectors

View local regulations

Different regions have different laws and regulations. Before purchase, you need to check the laws and regulations of your region, such as whether it needs to be installed compulsorily or what type of detector needs to be installed in what house. The United States needs to pass UL certification and Europe needs to pass EN certification.

Selection of power supply

Hardwired smoke and carbon monoxide detectors are connected to your home wires, need professional installation, and usually have backup batteries. Battery-only detectors are the easiest to install and can work in case of power failure. Some models use removable batteries that need to be replaced every year, while others use sealed lithium batteries that can be used throughout the service life of the detector. Plug in detectors can also be used, but the power outlet is usually located at the lower part of the wall, and the best location for detectors is on or near the ceiling.

Do you need Intelligent function

The intelligent networked detector allows you to understand the situation at home when you are outside. It has complete functions and is very convenient, but its price is relatively high, which is several times that of ordinary detectors. For example, the addressable system provides a separate number or address for each detector. When an alarm occurs, relevant people can quickly and accurately locate the accident point. This kind of detector is also very expensive.

Get up to our New updates