YSI ODO RTU Documentation

Knowledge Base

YSI ODO RTU Optical Dissolved Oxygen Sensor X-Series Integration Guide


The YSI ODO RTU Optical Dissolved Oxygen Sensors utilize the most advanced DO measurement technology. It is often used in aquaculture, hydroelectric, and many other monitoring applications. The sensor is compatible with NexSens X-Series data loggers via RS-485 Modbus protocol.

An illustration of a YSI ODO RTU Optical Dissolved Oxygen Sensor connected to a NexSens X3 Data Logger transmitting data to the cloud, which is shown on the WQData LIVE mobile app (depicted on a phone).

Sensor Setup

Before the logger can be deployed, it must first be calibrated and set up in CONNECT software. Be sure to use the latest version of CONNECT.

  1. Use the UW-USB-485R-DC adapter to plug the sensor into the computer and open CONNECT.
  2. Click Sensor in the top left and select YSI ODO RTU from the drop-down.
    Click Sensor in the top left and select YSI ODO RTU from the drop-down.
  3. If necessary, adjust the Modbus Address.
  4. Follow the manufacturer’s guidelines to complete sensor setup for calibration.
    1. The CONNECT interface accommodates barometric pressure, mg/L, and zero oxygen calibration options.
    2. “Water-saturated” air calibration is recommended in most cases. After following the manufacturer’s guidelines for calibration setup, enter the local barometric pressure (in mmHg) under Calibrate ODO % Saturation and select Calibrate.

YSI ODO RTU Calibration interface.

 

Connecting with X-Series Loggers

Next, the YSI ODO RTU will need to be connected to the X-Series logger through CONNECT software. If you have not yet done so, set up the project in WQData LIVE.

  1. Connect the sensor using the supplied cable to one of the open sensor ports on the logger and note the port number.
  2. Plug the X3 into the USB port of the computer and power it on with the AC power cable.
  3. Open CONNECT and select the SENSOR tab.
    Open CONNECT and select the SENSOR tab.
  4. Click Add and select YSI from the Manufacturer drop-down. Then select the appropriate model.
  5. Set the Connection and port number.
  6. Select either Continuous or Switch in the Power drop-down.
    1. Switch is recomended for the YSI ODO RTU.
  7. Add or Remove parameters as desired, based on the sensor model.
  8. Adjust the Modbus Address to match what was set previously.
    YSI ODO RTU sensor profile in NexSens CONNECT Software.
  9. Select Save Sensor Profile.
  10. Complete the setup for all other sensors, and then click Save.
  11. Name the Sensor Profile List and select Ok.
    Save Sensor Profile List.
  12. Complete the setup for all other sensors, and then click Deploy.
    CONNECT interface with a YSI ODO RTU Optical Dissolved Oxygen Sensor added.
  13. Confirm that data is being transferred to WQData LIVE at the next interval (default is 10 minutes).

 

Mounting

Deployment setups will vary based on the platform, application, and site location. For general buoy mounting instructions and shoreside assembly, see below.

 

Buoy-Based Deployments

First, follow the appropriate User Guide in the Knowledge Base for buoy assembly. The sensor can be mounted near the surface or on a sensor string for water column measurements.

1. Cage Mount

Use the NexSens Small Instrument Cage Mount to attach the sensor to the buoy cage.

  1. Strap the sensor to the cage leg with the mount and cable ties (as shown). The mount is supplied with a rubber adhesive liner to prevent the YSI ODO RTU from sliding.
    Strap the sensor to the cage leg with the mount and cable ties (as shown). The mount is supplied with a rubber adhesive liner to prevent the sensor from sliding.
  2. Further secure the assembly by adding a few additional ties to the cable.
    Further secure the assembly by adding a few additional ties to the cable.

2. Water Column

Use the NexSens Instrument Mooring Clamp to securely attach the YSI ODO RTU to a sensor mooring line at the desired depth in the water column.
Use the NexSens Instrument Mooring Clamp to securely attach the sensor to a mooring line at the desired depth in the water column.

 

Shore-Based Deployments

For dock, pier, or bank deployments, it’s best to secure the sensor in a perforated PVC pipe.

  1. Extend the pipe into the water and deploy the sensor.
    Extend the pipe into the water and deploy the YSI ODO RTU.