CO2 Detectors (Carbon Dioxide Alarms)

Carbon Dioxide (CO2) Detectors

Safelincs offers a range of carefully selected CO2 monitors, detectors and alarms from leading and trusted manufacturers. These include portable, wearable detectors and fixed multi-sensor alarm systems for environments with potentially toxic carbon dioxide concentrations. Standalone monitors are used for measuring lower levels of CO2 in homes and low-hazard enclosed spaces as this is an excellent indicator of basic air quality. Installing a simple CO2 monitor is fast becoming the de facto method of ensuring good ventilation in offices and school classrooms to reduce transmission of airborne viruses and bacteria.

What is the difference between Monitor, Detector, and Alarm?

These terms are often seen as being interchangeable and there are no hard and fast rules within the smoke, fire and gas detection industry on their use. Where carbon dioxide gas is the hazard, the terms used are even more variable. The most important thing is to understand the features you need and what the product offers, whatever name is used.

Alarm - The term "Alarm" generally refers to a loud audible noise to ensure that persons are made aware of a hazard that is potentially life-threatening. Where non-toxic CO2 levels are measured in order to gauge air quality and feature an audible alert, "Alarm" is often used by some but might be better though of as "Alert", "Warning" or "Notification". As for an Alarm device, this is quite consistently used to mean one which features both a Detector and a Sounder as a single unit. The best example of a safety-critical CO2 alarm would be a personal, portable device worn by operatives moving through environments where high levels of carbon dioxide could be found.

Monitor - A Monitor is typically a device which constantly samples the air for the purposes of measuring air quality rather than warning of an immediate risk to life. Levels of CO2 are displayed to a good degree of accuracy (even down to 0.1%) and may be shown along with temperature and humidity. Monitors may or may not feature an audible warning sounder but most will show some kind of text or symbolic warning, possibly with accompanying colour indicators.

Detector - This term is the most widely used and also the most confusing. Person-worn devices as described above are commonly called "Personal CO2 Detectors" though the purpose is to Alarm the user to danger. However, in a fixed system like those used in breweries, cellars and laboratories, a Detector is simply the unit that analyses the levels of CO2 present; the alarm function is performed by a separate Sounder, and several Detectors and Sounders can be used in one system connected to a Control and Display Unit.

Is carbon dioxide dangerous?

At high a enough concentration carbon dioxide is lethal. Such levels are most often present only in confined spaces and resulting from a human-made process such as those used in manufacturing, chemical production, agriculture, or the beverage industry. CO2 is also a naturally occurring gas at around 0.04% of the atmosphere (400ppm). Carbon dioxide is odourless and colourless so if levels rise they cannot be detected by humans until the effects of overexposure become noticeable.

Because CO2 is heavier than air it will sink in confined spaces and displace oxygen. This process, rather than poisoning by carbon dioxide, is the cause of so many deaths in agriculture. Such tragedies can be avoided by good health and safety practices and provisions, the latter of which includes equipment for measuring CO2 levels and alerting operatives at set trigger levels within their workplace.

At lower concentrations below around 5000ppm, CO2 is generally not harmful but will produce noticeable health effects as levels rise above normal. Symptoms range from mild drowsiness & feelings of a lack of fresh air to headaches, loss of concentration & attention, sleepiness, and nausea. Stale air is also a perfect environment for airborne transmission of diseases, so monitoring CO2 levels is a great way to stay alert and healthy.