Ultraviolet Relay with Self-Checking Facility is a safe combustion controller used in combination with the advanced UV sensor. The Ultraviolet Relay tracks data on flame voltage, shutter on-off cycles, etc and flame voltage trends can be viewed on a PC monitor. The Ultraviolet Relay is highly efficient and ensures ease of operations. Ultraviolet Relay with Self-Checking Facility ensures ease of installation and has long service life.