Access Control and Fire

Ultrafast Carbon Dioxide Sensor Used to Upgrade CO2Meter’s Data Logger for Quicker Results

07 November 2018

Carbon dioxide (CO2) is an ideal fire suppressor for many applications, because apart from actual fire damage, there is no clean-up or residue associated with a CO2 system – unlike with foaming agents or water. When a fire starts, high-pressure CO2 is released into the area it is protecting. The gas displaces the oxygen until there is no longer enough to support combustion. The fire can then be controlled or extinguished.

A common application is the protection of switch rooms or control panels, and other confined space environments like server farms which house electrical components, computers or process equipment. Other common uses include gas turbine enclosures, power generation stations and flammable liquid storage areas.

However, there are two key challenges when using CO2. First, the gas cylinders used in these fire suppression systems could leak. Therefore the areas where they are stored need to be monitored. Second, when such a system has been deployed, the atmosphere must be checked to ensure that the CO2 has dispersed to safe levels for re-entry.

CO2Meter has developed a data logger capable of measuring up to 100% CO2 concentrations. The portable SprintIR-6S 100% carbon dioxide sensor for high speed measurements. Source: GSSSprintIR-6S 100% carbon dioxide sensor for high speed measurements. Source: GSSdevice is well-suited suited for leak detection testing in fire extinguisher systems and can detect even a slight change in the level of CO2. By attaching a length of tubing, the unit can run in real-time along pipe connections and valves to pinpoint leaks – even in hard-to-reach places.

This unit is also used to create a 3D map of the CO2 levels in a particular space, by sampling from both horizontal and vertical locations. This helps determine when it is safe for emergency services to enter an area after a CO2 extinguisher has been used.

“Our original design used a GSS ExplorIR-W CO2 sensor, as the low power requirements of their LED-based technology enabled us to create a portable, battery-powered product that could go weeks between recharges,” explained Irene Hicks, CEO of CO2Meter. “It is also highly CM-0003 handheld carbon dioxide monitor. Source: GSSCM-0003 handheld carbon dioxide monitor. Source: GSSaccurate right up to 100% CO2 concentrations, which is vital for a sensor in safety applications. However, an almost instant CO2 reading is needed in some situations, so in the future we will be using a high-speed GSS SprintIR-6S sensor in our data logger. This sensor takes 20 readings per second, so it’s ideal for recording fluctuating CO2 levels, particularly in fast-changing environments. The beauty of the SprintIR-6S is that it’s still low power enough to be used in our portable data logger, so you can have high speed and low power sensing effectively combined.”

A customer of the CM-0003, who uses them for full discharge tests of CO2 fire suppression systems, said, “The meters are small enough to take as carry-on luggage, which I find very useful. I typically use three or four meters simultaneously, with test times ranging from 30 to 60 minutes each. To date I’ve used these CM-0003 meters for testing well over 200 sites.”

The data logger model (CM-0003) is available from the CO2Meter website.

To contact the author of this article, email engineering360editors@globalspec.com


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