oxygen analyzer, Model (AZ30): Flue Gas Oxygen Analyzer Flameproof/Explosion-proof., Transmitter Configuration: The first numbers (1.2.2...) usually indicate the type of mounting (integral or remote) and the length of the probe (from 0.5 to 2.0 meters)., Communication: Supports the protocol as standard HART., Certification (E): Indicates compliance for Hazardous Areas, such as Zones 1, 2, 21, 22., STD: Indicate the variant Standard of the device.