Measuring system 'Ecoline O-DO' for dissolved oxygen with optical sensor:The digital sensor based on the luminescence method - an optical measuring method - is characterized by long-term stable, low-drift and low-maintenance measurement compared to electrochemical sensors. The Ecoline O-DO stores calibration data and calibration history directly in the sensor head and is designed with protection class IP 67. The sensor with stainless steel housing (25 mm x 124.5 mm) has a measuring range of 0-20 mg/l and an operating temperature range of 0°-60°C. The sensor is connected to the Aquis 500 RS transmitter via the RS485 Modbus RTU protocol.