Specifications include, but are not limited toThe Online Dissolved Oxygen (DO) Analyzer shall be a new, current production, Department approved model with the following minimum specifications: 1. The Online Dissolved Oxygen Analyzer package shall include four (4) Hach LDO 2 sc, DO probes with mounting conversion adapters, five (5) Hach SC4500 controllers, and five (5) SC4x00 UV protection screens with sunroof. 2. The instrument shall be designed for the continuous, online process monitoring of Dissolved Oxygen in wastewater. 3. The instrument shall be designed for the continuous, online monitoring of wastewater and shall be designed for use in a wastewater treatment plant. 4. The instrument shall utilize a method approved by the EPA for wastewater analysis. 5. The method of measuring Dissolved Oxygen shall utilize luminescent dissolved oxygen technology. 6. The instrument shall be capable of Modbus RTU, Modbus TCP/IP, and/or Profibus communication protocols. 7. The instrument shall include a minimum of three 4-20mA outputs enabled. 8. The instrument shall be equipped with a high contrast 40-character x 16-line backlit LCD display with LED backlight. 9. The user interface shall be a microcontroller with membrane keyboard. 10.The instrument shall have a measurement range of 0-20 mg/L (0-200%)