The VOXI PID is a fixed sensor transmitter that utilizes a Photo-ionization Detection (PID) technology to monitor Volatile Organic Compounds (VOCs) at either 1 ppb or 10 ppb resolutions. The VOXI PID features an built-in heater that prevents condensation of moisture in the transmitter under high-humidity conditions. Innovative designs of the ultraviolet (UV) 10.6 eV lamp and electrometer reduce contamination, producing more accurate and stable readings and extending maintenance intervals. A mobile apps allows connectivity via a Bluetooth controller that makes on-site configuration, testing, and trouble-shooting easy and handy. The OLED display is visible from a distance even under strong lighting or darkness, while data and alarms are continuously sent to a controller wirelessly or via cables.