IR29 DB Transmitters - With Display, Modbus, and, infrared sensor for flammable gases in Ex zones. If flammable gases and vapors need to be monitored in Ex zones, the IR29 DB transmitter is a reliable and robust solution. It transmits measured values and status notifications via Modbus protocol on an RS-485 interface. The LC display indicates the current measured values. Gases are monitored either on site by diffusion or by pressureless gas supply using a flow adapter. In combination with one of GfG's reliable controllers, it can be installed in new gas detection systems or retrofitted into existing ones.