Endress+Hauser COM253 Liquisys Dissolved Oxygen Transmitter: Digital DO Measurement | Technical Specifications & Applications​

​Product Overview​

The Endress+Hauser COM253 is a ​compact dissolved oxygen transmitter​ designed for continuous monitoring in water, wastewater, and aquaculture applications. It supports ​digital sensor integration​ (e.g., COS41/COS61) and features HART/Profibus communication, automatic calibration checks, and robust IP65-rated housing. Ideal for oxygenation control in aeration tanks or environmental monitoring, the device ensures high accuracy and operational safety under demanding conditions .

​Technical Specifications​

​Key Features​

1. ​High Operational Safety: The transmitter continuously validates sensor and process data, with user-customizable alarms and calibration integrity checks. This reduces measurement errors in critical applications like wastewater treatment .

2. ​Flexible Communication: Integrated HART and Profibus protocols enable seamless integration into control systems. Optional relays support advanced functions such as limit alarms or timer controls for automated processes .

3. ​Simple Maintenance: A dedicated calibration button and guided menu streamline sensor calibration in air, oxygen-saturated water, or process media. The plug-in design allows rapid module replacement without rewiring .

4. ​Rugged Design: The IP65-rated housing protects against dust and water ingress, ensuring reliability in outdoor or humid environments. The compact form factor simplifies mounting in space-constrained panels .

5. ​Sensor Compatibility: Optimized for use with Endress+Hauser’s COS41/COS61 optical or amperometric DO sensors, ensuring accurate data across varying temperatures and media conditions

​Application Scenarios​

• ​Wastewater Aeration Control: Monitors dissolved oxygen in activated sludge tanks to optimize blower efficiency and reduce energy consumption in municipal plants .

• ​Drinking Water Monitoring: Ensures oxygen levels remain within safe limits for public water supplies, with compliance reporting via digital interfaces .

• ​Aquaculture Management: Maintains optimal oxygen concentrations in fish farms to support aquatic health and growth, using reliable probes resistant to biofouling .

• ​Surface Water Analysis: Deployed in rivers or lakes for environmental monitoring, with robust construction enduring long-term exposure to elements .

Note: Specifications are based on manufacturer documentation and industry sources. Verify parameters against the latest technical guides for specific applications .