Optical dissolved oxygen sensor ODO RTU

luminescenceModbusRS-485

Overview
Engineered specifically for aquaculture applications but compatible with any Modbus system, the ODO RTU is an optical dissolved oxygen (ODO) and temperature sensor designed for easy installation at sites, tanks, or ponds. It delivers optical luminescence DO measurement with reduced maintenance and improved energy efficiency. Additional inputs for barometric pressure and salinity enable accurate DO% and mg/L calculations. An option with built-in conductivity is available for automatic salinity compensation.

Key Benefits

• Smarter Sensors — Optical dissolved oxygen provides higher accuracy readings with less maintenance
• Seamless Integration — Modbus communication integrates directly to PLCs or data loggers without additional software
• Automatic Compensation — Optional built-in conductivity sensor automates salinity compensation
• Less Maintenance, Long Warranty — 2-year cable and probe warranty; user-replaceable DO cap

Features

• Optical luminescence DO technology for stable, accurate DO and low maintenance
• Modbus/RS485 (4 wire) communication
• Additional inputs for barometric pressure and salinity; built-in conductivity option for automatic salinity compensation
• DO% and mg/L calculations included
• Designed for remote/RTU installations, pond/tank/aquaculture monitoring

Product Options / Configurations

• ODO RTU Probe Assembly - cable length options: 4 m, 10 m, 20 m, 30 m, 50 m, 100 m
• ODO RTU Probe Assembly with Conductivity - cable length options: 4 m, 10 m, 20 m, 30 m, 50 m, 100 m
• SKU example shown on page: 627350-4

Notes

• Not for use with the ProSolo or ProODO handheld meters

Specifications / Technical Specifications

• Communication: Modbus/RS485 (4 wire)
• Default Baud Rate: 9600 (user programmable)
• Dissolved Oxygen (Optical luminescence) Units:
  Range: 0 to 500%, 0 to 50 mg/L
  Accuracy: 0 to 200%: ±1% of reading or 1% saturation, whichever is greater; 200 to 500%: ±8% of reading; 0 to 20 mg/L: ±0.1 mg/L or 1% of reading, whichever is greater; 20 to 50 mg/L: ±8% of reading
  Resolution: 0.01 mg/L and 0.1 %, or 0.1 mg/L and 1% (auto-adjusted based on range)
• Power: 10 V to 16 V DC, 15 mA max
• Size: 2.46 cm diameter; cable options for 1, 4, 10, 20, 30, 50, and 100 m lengths
• Temperature (Thermistor) Units:
  Range: –5 to 70°C (DO compensation range for mg/L: –5 to 50°C)
  Accuracy: ±0.2°C
  Resolution: 0.1°C or 0.1°F (auto-adjusted based on range)
• Warranty: 2 years on cable, probe, and ODO sensor cap
• Additional Conductivity Specifications:
  Conductivity (Four nickel electrode cell) Units: μS/cm, mS/cm — Range: 0 to 200 mS/cm — Accuracy: 0 to 100 mS/cm ±0.5% of reading or 0.001 mS/cm, whichever is greater; 100 to 200 mS/cm ±1.0% of reading — Resolution: 0.001, 0.01, or 0.1 μS (range dependent)
• Salinity Units:
  Range: 0 to 70 ppt — Accuracy: ±1.0% of reading or ±0.1 ppt, whichever is greater — Resolution: 0.01 ppt