Rosemount 490A Optical Dissolved Oxygen Sensor

The Rosemount 490A optical dissolved oxygen sensor is ideal for use in wastewater aeration basins and ponds. The sensor has a low maintenance sensing cap that measures dissolved oxygen using the Environmental Protection Agency (EPA)-approved luminescence-quenching method.

The 490A sensor is designed for ease of use and low maintenance, making it ideal for a wide range of applications. It accurately measures in both liquid and gas phases without the need for separate calibrations, and provides reliable readings within 90 seconds of transitioning from dry to wet conditions. Built to last, it features chemical and abrasion resistance, an extended sensor and sensor cap life, and a low-maintenance sensing cap that only needs replacement every two years. Additionally, its easy-to-configure Modbus interface ensures seamless integration and setup.

Features

• Measures in both liquid and gas without requiring separate calibrations
• Reads accurately within 90 seconds of going from dry to wet conditions
• Chemical and abrasion resistant
• Easy-to-configure Modbus interface
• 0 to 60 mg/L or 0 to 600 percent saturation dissolved oxygen (DO) range
• ±0.1 mg/L (0 to 20 mg/L), ±2 percent (20 to 60 mg/L) DO accuracy
• 0.01 mg/L DO resolution
• Response time:
  • <45 seconds to 90 percent of final value
  • <60 seconds to 95 percent of final value
• 23 to 122°F (-5 to 50°C) temperature range
• ±0.1°C accuracy over temperature
• 150 psi (10.3 bar) from 32 to 122°F (0 to 50°C) pressure rating
• 689ft (210m) at 77°F (25°C) depth rating