Control unit "Vega-8" (Vega Odor) is produced by ELAS Company by request Termokompleks. The modern diaphragm metering pumps MLEx and flow transmitter WDK are used in odorizer TK-OGA. MLEx and WDK are produced by E.M.S. Germany. "Vega-8" provides odorant dosing in proportion to the volume of gas. A distinctive feature of the complex is to measure each dose of the odorant. This feedback allows more accurate process control and automatically signals when fault was happened. The contol unit "Vega-8" has hourly data log, event log, interventions log. The controller is equipped with RS485, Modbus RTU