The Chillgard RT Monitor utilizes a stable technology known as photoacoustic infrared (PAIR) to sense refrigerant gases at levels as low as one part per million. This allows the user to be in compliance with ASHRAE 147 and ASHRAE 15 standards, not to mention detecting a leak early enough to prevent a major loss of refrigerant gas. The Chillgard RT Monitor operates for months with virtually no zero drift. This stability eliminates the requirement of any auto-zeroing techniques, which take the monitor offline at regular intervals and increase maintenance required for insuring a clean, constant-zero air source. The Chillgard RT monitor saves operating costs by detecting a leak early enough to prevent a major loss of refrigerant gas. This monitor is purpose-built to monitor up to eight remote areas and is completely configurable to detect either a specific refrigerant or group of refrigerant gases.