CO2 safety alarm

ideal for CO2 gas cylinders or dry ice in the workplace


  • Image result for rad-0102-6The ESRAD-102 CO2 Alarm is the product that is required by workplaces where CO2 and/or nitrogen (N2) gas cylinders or dry ice are stored in confined spaces such as storage areas, basements, cool rooms or laboratories.
  • Ideal for cellars, basements, enclosed areas in pubs, clubs and restaurants
  • Ideal where dry ice is used in the workplace
  • Comply with workplace safety standards AS5034-2005
  • Audible and Visual Alarms


The CO2 Storage Safety Alarm is designed to protect you and your staff near stored carbon dioxide (CO2). There is also an option to monitor safe levels of oxygen (ESRAD-200 model).

Comply with workplace safety standard AS5034-2005 that requires workplaces to install a CO2 and/or O2 safety alarm where CO2 gas cylinders, or N2 gas cylinders, are stored in an enclosed environment.

CO2 alarms are critical in laboratories, cool rooms, wastewater treatment facilities, breweries, wineries, beverage dispensing areas, restaurants, fast food establishments, dry ice storage, storage tanks, or anywhere CO2 is stored or produced in high volume. O2 levels are critical in laboratories and hospitals.

The Monitor has both audible and visual alarms. 2 built-in relays can trigger the alarms at different user-defined CO2 levels, as well as control a ventilation fan or an HVAC control switch to notify maintenance staff of high CO2 levels. This meets the OSHA PEL (Personal Exposure Limit) Standard of 5,000ppm TWA (time weighted average) in a typical 8-hour workday.

The CO2 Storage Safety Alarm is easy to install and use. Simply mount both units on the wall (all cables and hardware included), plug the display unit into a standard wall jack, and the alarms are ready to protect you, your family and your employees.


  • ESRAD-102: Remote CO2 Storage Safety with Dual Alarm
  • ESRAD-102SX2: Remote CO2 Storage Safety with Dual Alarm and Strobe Light Warning System
  • ESRAD-200: Remote CO2 + O2 Storage Safety with Dual Alarm


  • Sensor connects with Remote Display Unit using 8m RJ45 cable (included)
  • Large digital LCD display clearly indicates the current CO2 level and temperature
  • Model ESRAD-102SX2 only: (2) 100 cd strobe lights w 2m cables for additional visual notification of alarm
  • Model ESRAD-200 only: simultaneous measurements of carbon dioxide and oxygen
  • 2 relays to control ventilation fan(s) or provide remote monitoring
  • Built-in 80dB audible and visual alarm indications
  • IP54 Enclosure - prevents water damage during wash-down


installation tips

Properly placing carbon dioxide gas monitoring alarms during installation cannot be underestimated. Serious thought should be put into planning the placement, electrical wiring, careful protection of devices as well as how to train employees about the devices and what to do if they go off. In every instance a risk assessment is the initial key to safety.

There are 2 parts to every CO2 monitor and safety alarm:

  1. CO2 sensor
  2. Remote display

Note that while both of these devices include audible and visual alarms, they need to be installed differently.


Installing the CO2 Sensor

Your site assessment should consider four factors to insure proper installation of the systems.

Prior to your site assessment we recommend that you inquire about and understand the local and state codes that may now require specific additions to monitors.  Adding strobe lights for additional visual notification is the most common addition.  Some jurisdictions are also requiring that monitors be tied to the fire alarm panel to trigger an automatic call to the local Fire Department to warn of a CO2 leak.  Meeting these new requirements is not optional,  You will be fined if these requirements are not met.

Different applications allow for different coverage areas.

Enclosed Beverage Systems - In these applications monitors cover approx. 1,250 sq. feet (length x width of the space). Typically, placement within 10 feet of the bulk CO2 storage tank, cylinders, and the BIB rack is sufficient. Larger spaces may require additional monitors. Enclosed rooms/spaces (closets, offices, bathrooms, and keg coolers) may require additional monitoring as gas can be trapped in these spaces because of the enclosure.

Purposefully Enriched Areas

Applications where CO2 is intentionally injected into a space (called enrichment) will allow for larger coverage areas. Indoor Agriculture usage will allow for larger coverage areas because of the continuous circulation of the environment. In these applications a gas detection monitor can effectively cover less than 2,000 sq. feet (length x width of the space).

However, each installation should be considered individually to account for the particular layout and any varying or enclosed spaces within the footprint.

CO2Meter Remote CO2 Storage Safety 3 Alarm RAD Installation Process and Guide


Where Should the Carbon Dioxide (CO2) Sensor be Mounted?

Once you know the approximate location of the sensors, the confined space, and how many you'll require, the next step is to determine where to mount them.

Think of CO2 flowing like water. Water will fill a cup from the bottom upwards.  The same will happen in interior spaces like draft coolers, restaurants, breweries, and grow facilities. Because the CO2 gas is heavier than normal air it will flow down stairs or collect in low lying areas first. For this reason, the CO2 sensor unit should be mounted no higher than 12-18 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, if using the power adapter insure that the plug is secured to the wall to insure staff does not accidentally or purposefully 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 in an enclosed area where a potential CO2 leak could occur, the Remote Display is designed to be mounted outside the space and to warn staff of a potential gas leak before entering the area.

Remote displays are best mounted at eye level near 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.


Safety Signage

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.

CO2 Safety Necessary Warning Signage

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.



feature specification
Measurement Principle NDIR (Non-Dispersive Infra-Red)
Measurement Range 0-5% (50,000ppm)
CO2 Alarm Set Points Relay 1: 1.5%. Relay 2: 3% CO2 (configurable)
Alarm Audible @ 80 dB | Visual with LED lights
Operating Temperature 0 to 50 °C
Calibration Check every 6 months | Fresh air calibration
CO2 Sensor Lifetime approx. 15 years
Power Supply 110-240 VAC to 6 VDC Adapter
Power Consumption 3 Watts
Relays Peak Current < 2A @ 30VDC or 250VAC, SPDT
Warranty 1 year

manual & docs




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