The placement of carbon dioxide gas monitoring alarms during installation cannot be underestimated. Serious thought should be put into planning for the best location to install the device. In every instance a risk assessment is the key to safety.
There are 2 parts to every CO2 monitor and safety alarm:
- CO2 sensor
- Remote display
Note that while both these devices include audible and visual alarms, they need to be installed differently.
Installing the CO2 Sensor
The correct location of the CO2 sensor unit must consider the potential sources of gas leaks and the location of expected human occupants in the area. In addition, local and state regulations must be understood and considered to ensure all guidelines and codes are met.
Where large areas need to be monitored, it is advised that no single monitor should cover a free air volume in excess of 80m^3, or 2,825 cubic feet. For example, assuming a 8 foot ceiling, a single monitor could cover an approximately 18x20 square foot room. The installation of additional monitors should also be considered where the design of an area includes complex shapes, contains obstacles, has a lack of ventilation or air circulation. Also consider enclosed spaces within the area like storage closets, coolers, and equipment rooms.
Assuming the device is used in a totally open area, no more than 10 meters or 32 feet should be between CO2 monitoring devices. However, each installation should be considered individually to account for the particular layout and any varying or enclosed spaces within the footprint.
Where Should the CO2 Sensor be Mounted?
Once you know the approximate location of the sensors and how many you'll require, the next step is to determine where to mount them.
Think of CO2 flowing like water. Because the CO2 gas is heavier than normal air it will flow down stairs or collect in low lying areas. For this reason, the CO2 sensor unit should be mounted no higher than 18-24 inches (45-60 cm) above the floor.
The next consideration is power. While our CO2 Safety Monitors use a 110-220 VAC 50/60 Hz to 12VDC power, a 24 VDC hard-wired power option is available if normal wall power is not readily available. The important thing to remember is that the CO2 Sensor should be mounted in such a way that it cannot be accidentally damaged when moving boxes, crates or gas cylinders nearby. In addition, the power adapter should be secured to the wall to insure staff does not unplug the alarm.
Installing the CO2 Remote Display
Both the CO2 Sensor unit and remote display unit have audible and visual alarms. However, while the CO2 Sensor monitors an enclosed area where a potential CO2 leak could occur, the Remote Display is designed to warn staff of a potential gas leak before entering the area.
Remote displays are best mounted at eye level on the door frame of any door entering the enclosed area. They should be mounted on the same side as the door handle to insure they are not covered when the door is open.
Our CO2 Safety Monitors have the ability to daisy-chain up to 3 remote displays to a single CO2 sensor unit. If their are more than 3 entry doors, a second CO2 sensor unit will be required.
Once the CO2 Sensor Unit and Remote Display(s) are installed, you should also install safety signage at every door. The signage should be visible whether the door is opened or closed.
All our CO2 Safety Monitors come with the necessary safety signage. You can see the code or download copies of these signs to print here.
Note that the suggestions above are best practices gained from experience, but are not an endorsement of any specific location in your building. Every installation is different. If you have questions about your installation, contact your local building inspector.