R-744
CO₂R-744 (carbon dioxide) is a natural refrigerant used in transcritical and subcritical systems. It has zero ODP and GWP of 1, making it highly environmentally friendly.
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Key Information
Essential safety and exposure information for R-744
Health Effects
Concentrations above 3% can cause headaches and dizziness. Above 5% can cause rapid breathing and confusion. Above 10% can cause unconsciousness.
Common Sources
- Transcritical supermarket systems
- industrial refrigeration
- heat pumps
- vending machines
Exposure Limits
- OSHA PEL
- 5,000 ppm
- NIOSH REL
- 5,000 ppm (ST 30,000)
- ACGIH TLV
- 5,000 ppm
Regulatory Status
- EPA SNAP
- Acceptable substitute
- ASHRAE 34
- A1 Safety Classification
- GWP
- 1 (Natural refrigerant)
- ODP
- 0
- DOT
- Class 2.2 Non-flammable, UN1013
- Application
- Transcritical systems, cascade
Detection Requirements
- Sensor Technology
- Infrared (NDIR)
- Detection Range
- 0-50,000 ppm (typical for CO₂)
- Response Time
- <30 seconds (T90)
- Cross-Sensitivity
- Minimal for CO₂-specific sensors
- Calibration
- Annual with certified CO₂ standard
Related Applications
Industries and environments where R-744 detection is critical
Detection Solutions
Sensors and detectors for R-744 monitoring
cGas Detector VRF IR Refrigerant Transmitter
An aesthetic, non-dispersive infrared refrigerant gas detector for acute leak detection in modern energy-efficient buildings utilizing Variable Refrigerant Flow (VRF) HVAC systems.
cGas-SC Self-Contained Controller
A self contained controller with up to 3 gas channels, Plug & Play Smart Sensor Technology and configurable logic control and priority settings. Offers superior user customization and reliable gas detection performance for monitoring many gases.
cGas Detector IR Refrigerant Transmitter
Non-dispersive infrared refrigerant gas detector with accurate, low level leak detection, available with analog output or BACnet® or Modbus® output and Plug & Play Smart Sensor Technology.
FCS Multi Channel System Controllers
High performance controller with logic and priority settings for monitoring toxic, combustible and refrigerant gases with versatile control functionality. Available with Modbus® or BACnet® communication with BAS, supports 4-20 mA and Modbus® driven VFDs.