YSI ODO RTU Calibration Utility

Utilize the YSI ODO RTU calibration utility in CONNECT to enter calibration coefficients, and directly calibrate both dissolved oxygen and conductivity. Calibration coefficients are located on the “YSI ODO Sensor Cap Instruction Sheet” included with the new sensor cap. After the coefficients are entered, the user will need to perform a 1-point DO calibration within the utility. Additionally, before deployment, it is recommended to perform a 1-point conductivity calibration.

Connect Directly to the ODO RTU Sensor

1. Download and launch the CONNECT Software.
2. Connect the included USB cable between the PC and the YSI ODO RTU sensor.
3. From the Properties window, select the proper COM Port for the cable from the Comm Settings tab on the far right.
   1. Set the following:
      • Baud = 9600
      • Frame = E81
      • MBAddr = 1 (Default address is 1; however, enter the appropriate address if it has been changed).

 

4. Provide 12VDC power to the YSI ODO RTU sensor.
5. Go to Tool | Sensor | YSI ODO RTU.

YSI ODO RTU utility location.

YSI ODO RTU calibration utility.

 

Perform Conductivity Calibration

1. Follow the Calibration – Conductivity section 3.2 (page 7) in the manual link below to properly set up the sensor for calibration.
   1. YSI ODO RTU User Manual
2. Select the appropriate calibration standard for the conductivity of the sampling environment.
   1. Enter this value in the available field and click Calibrate after allowing the sensor to stabilize in solution.

 

Note: All calibrations can be reset to factory calibration using the available options.

 

Insert DO Cap Coefficients and Calibrate DO

1. Using information from the “YSI ODO Sensor Cap Instruction Sheet”, insert the calibration coefficients into the box next to their corresponding ‘K’ values.
   1. Read the coefficients before writing the new values.
   2. Double-check all values and press Send Coefficients.

 

2. YSI recommends performing a 1-point DO calibration after installing a new sensor cap. Follow the Calibration – Dissolved Oxygen section 3.3 (page 8) in the manual link below to properly set up the sensor for calibration.
   1. YSI ODO RTU User Manual
3. For dissolved oxygen calibrations:
   1. If calibrating ODO % saturation, enter the local barometric pressure in mmHg using a 3rd party sensor. Click Calibrate after allowing the sensor to stabilize in solution.
      • Note: The barometric pressure by a local weather forecast is sea-level corrected, and thus, cannot be used.
   2. If calibrating ODO mg/L, enter the known DO standard in mg/L and the known salinity value. Click Calibrate after allowing the sensor to stabilize in solution.
      • Note: The salinity value is ignored for calibration if the ODO RTU includes a conductivity sensor.
   3. If performing a zero standard calibration, click Calibrate after allowing the sensor to stabilize in solution.

 

Note: All calibrations can be reset to factory calibration using the available options.

 

Read Last Calibration Time and Live Measurement

Once a calibration is performed, the latest calibration time and the QC score are available. There are three potential responses for the QC score:

• 0 (Best)
  • The sensor is calibrated properly and all parameters used to assess its performance state are within factory-defined limits.
• 1 (OK)
  • The sensor will still perform within factory-defined limits, but that during calibration enough of an adjustment was required to suggest that the sensor is drifting from those limits or may soon require some adjustments, such as a new DO cap.
• 2 (Bad)
  • The sensor is not performing within factory-specified limits. Also, in some cases a bad QC Score might mean that a component of the sensor is due to be replaced (such as a DO cap), or the user has defined some other limit, such as the term expired since the most recent calibration.

 

Note: It is recommended to read a direct measurement value from the sensor within the standard solutions after the calibrations are complete.