Operation and Calibration

Main Screen                                              

After the TS10 is turned on (press button on left side of panel), a “Blue-White” introduction screen will appear while the unit is starting-up. The main interface will appear and display real-time chlorine residual, pH value, and turbidity of the water flowing through the WR20 chamber. It may take as long as 5 minutes for readings to stabilize.  The 4-20ma input signal, 4-20ma output signal and relay output status are displayed on the main screen. See screen highlighted sections 1-4.  

Main Screen Display Range                                           

To change the ranges of display for each value on the main screen, Press and hold the curve area for 2 seconds and then let go. The Y-axis curve range setting dialog box will appear. Users may change the display value range of Y-axis for each measurement index curve. Click the outer area of the screen to save and exit the setting screen after modifications are made. 

Calibration                                            

The sensors are calibrated at the factory, and it is generally not necessary to calibrate the sensor upon the initial start-up of the system.   

pH Calibration                                             

The probe is calibrated at the factory. It is generally not necessary to calibrate the sensor upon start-up. Depending on use and site requirements, calibration may be necessary as frequently as every 3 months, but typically is not required more than once a year.  

Before calibration, ensure that calibration standards are present, and that clean beakers and DI rinse solution are available. Remove the probe from the unit and rinse the sensor with DI water. Visually inspect the sensor surface and ensure it is clean. Gently wipe with a lint-free cloth, as needed. Probe cleaning solution is available if needed.  

From the Main Screen, press the Home key to reach the Main Menu Interface. 

Press “Calibration” and then press Enter. 

You will now have the option of calibrating the CL2, pH, or Turbidity.  

Press “pH Cal” to calibrate pH.  

After checking with a pH standard buffer solution, if the sensor value has shifted, then the user may choose from single-point, two-point or three- point calibration to re-calibrate the pH portion of the FCL700 sensor as desired. 

For each calibration, remove sensor and rinse 3x with DI water. Then place the sensor in the calibration standard for at least one minute and let the measurement stabilize. Then press the appropriate Cal key to start the calibration. The screen will ask that you confirm.  Press “OK” key.   

The calibration will typically take 30-60 seconds.  A “Calibration Success” message will appear.  If a calibration error appears, it may be necessary to let the sensor stabilize longer.  

Revert to the main screen to see the actual reading of the standard to ensure it is reading properly.  If readings are incorrect, continuing to drift, or otherwise incorrect, the sensor may be dirty or damaged. Contact the factory for assistance.  If sensor replacement is necessary, refer the maintenance section of the Help Center or Instruction Manual.  

Chlorine CL2 Calibration                                             

The probe is calibrated at the factory and it is generally not necessary to calibrate the sensor upon start-up.  Depending on use and site requirements, calibration may be necessary.  

Before calibration, ensure that calibration standards are present, and clean beakers and DI rinse solution is available.  Remove the probe from the unit and rinse the sensor with DI water. Visually inspect the sensor surface and ensure it is clean. Gently wipe with lint free cloth, as needed.  

From the Main Screen, press the Home key to reach the Main Menu Interface. 

Press “Calibration” and then press Enter. 

You will now have the option of calibrating the CL2, pH, or Turbidity.  

Press “FCL Cal” to calibrate chlorine.  

You will have the option of “Single Point Calibration” and “Two Point Calibration. “    

Use a portable or laboratory colorimeter to test the active (flowing) water sample in the WR20 flow reservoir. DPD wet chemistry methodology is recommended. Once you have tested and confirmed the residual chlorine concentration value in the active (flowing) WR20 flow reservoir, enter the test result value of the portable or laboratory colorimeter in FCL Calibration Screen and click “High Point Calibration”. A dialog box will pop up to confirm whether to perform this operation. If the calibration operation is confirmed, click “OK”, and if the calibration is successful, the dialog box will show “Calibration Success”. 

 If a “Two Point Calibration” is required, the user must perform a “Blank Calibration / Zero Calibration” and a “ Slope Calibration / High Point Calibration.”  

Blank Calibration Procedure:  

To achieve blank calibration of the FCL700 sensor, close the water inlet valve and clean the WR20 flow reservoir with deionized water 2-3 times. Then fill the WR20 flow reservoir with the known zero calibration solution. After filling the WR20 with zero calibration solution or Conductivity Standard Solution (100 us/cm), wait for the FCL700 sensor residual chlorine display value to stabilize on the touch-screen display. Sensor stabilization should occur within 15-minutes. Click “Zero Calibration” and a dialog box will pop up confirm whether your desire to perform this operation. Click “OK” to confirm the calibration operation. If the calibration is successful, the dialog box will show “Calibration Success”. The sensor is now blank-calibrated to the known zero calibration solution.  

Slope Calibration Procedure:  

Use a portable or laboratory colorimeter to test the active (flowing) water sample in the WR20 flow reservoir. DPD wet chemistry methodology is recommended. Once you have tested and confirmed the residual chlorine concentration value in the active (flowing) WR20 flow reservoir, enter the test result value of the portable or laboratory colorimeter in FCL Calibration Screen and click “High Point Calibration”. A dialog box will pop up to confirm whether to perform this operation. If the calibration operation is confirmed, click “OK”, and if the calibration is successful, the dialog box will show “Calibration Success”. 

Turbidity Calibration  

The UT700 Ultra Low Turbidity Sensor is rigorously calibrated at the factory. If the sensor is kept clean, the user will not need to calibrate the sensor for one year of operation. However, the user may calibrate the sensor as desired, or as required by site, local, or agency standards.. Prior to performing a calibration, the user can perform a diagnostic check on the sensor to determine if the sensor needs to be calibrated. To complete this task, the user must drain the WR20 flow reservoir and then wipe the WR20 flow cell and sensor surfaces with a dust-free cloth or paper towel to thoroughly clean them. Verify that there are no visible contaminants on the vessel walls or sensor surfaces. Once properly drained and cleaned, reinsert the UT700 Series sensor into the WR20 flow reservoir. Read the turbidity sensor display value on the touch screen display/data logger. 

Once the sensor has been cleaned and checked for proper operation, the UT700 sensor can be calibration for “Low Range”, “Mid Range”, and “High Range.”  The calibration procedure is the similar for each range. 

Turbidity calibration can be performed with the sensor located in the WR20 flow reservoir, or it can be performed using the CAL700 Portable Turbidity Calibration Kit. The CAL700 is recommended as it uses less standard, is easier to clean, and saves time. The extension cable is recommended when using CAL700. 

Low-Range Calibration Procedure:  

For Calibration in the WR20 reservoir, empty the WR20 flow cell and wipe the WR20 flow cell walls and turbidity sensor surfaces with a dust-free cloth or dust-free paper towel and verify that no contaminants are evident. Fill the WR20 flow cell with deionized water, then drain the contaminated deionized water. Repeat the cleaning operation as needed to ensure optimum cleanliness of the WR20 walls and sensor surfaces has been achieved.  

Then, fill the WR20 flow cell with bubble-free deionized water. (WR20 flow reservoir does not need to be completely filled, only fill reservoir above the level of the sensor.) After the displayed turbidity data is stable, enter “0.05” for the low-range calibration value and click on “Low Range Calibration”, a dialog box will pop up to confirm whether to perform this operation. Click “OK”, if the calibration is successful, the dialog box will show “Calibration successful”  

For Calibration with the CAL700 reservoir, rinse and clean the inside of CAL700 and turbidity sensor surfaces with a dust-free cloth or dust-free paper towel and verify that no contaminants are evident. Isolate the panel and drain the piping and inline Tee assemblies.  

Remove the UT700 sensor from the WR20 reservoir. Triple rinse the UT700 sensor surface, the WR20 flow reservoir internals and the CAL700 Portable Turbidity Calibration Kit with Deionized water.  

Insert the cleaned UT700 turbidity sensor into the CAL700 calibration vessel and position the CAL700 vessel vertically (with the sensor inserted in a horizontal position to the ground). (Note: The optional extension cable is recommended when using the CAL700.) Remove the top cap and fill the CAL700 vessel with 500mL of bubble-free deionized water.  

After the displayed turbidity data is stable, enter “0.05” for the low-range calibration value and click on “Low Range Calibration”, a dialog box will pop up to confirm whether to perform this operation. Click “OK”, if the calibration is successful, the dialog box will show “Calibration successful”. 

*NOTE* Because there is no global standard for zero turbidity in the industry, Blue-White recommends 0.05 NTU as a target for Low-Point Calibration. 

Mid-Range Calibration:  

After the low range calibration has been completed, fill the WR20 / CAL700 flow reservoir with known turbidity standard solution between 5NTU and 10NTU for mid-range calibration. After the displayed data is stable, enter the medium turbidity standard solution value and click on “Mid Range Calibration”, a dialog box will pop up to confirm whether to perform this operation. Click “OK”, if the calibration is successful, the dialog box will show “Calibration successful”.  

High-Range Calibration:  

If a high-range calibration is not required, the user does not need to perform a high-range calibration of the UT700 series sensor. If a high calibration is required, proceed by filling the WR20 / CAL700 flow reservoir with known turbidity standard solution between 20NTU and 40NTU for high-range calibration. After the displayed data is stable, enter the high turbidity standard solution value and click on “High Range Calibration”, a dialog box will pop up to confirm whether to perform this operation. Click “OK”, if the calibration is successful, the dialog box will show “Calibration successful”.  

Troubleshooting Calibration Failed Messages  

If you receive a “Calibration Fails” message during the calibration steps above, the following items should be checked:  

1) Ensure your source of Deionized water is not contaminated with turbidity  

2) Ensure your turbidity calibration standard solutions have not been contaminated  

3) Ensure the UT700 sensor distillate end is not contaminated with debris or other substances  

4) Ensure the WR20 / CAL700 flow reservoir is not contaminated or circulation blocked by debris or other materials. 

CAL700 Portable Liquid Formazin Turbidity Calibration Kit  

The calibration kit allows users to calibrate all ultra-low turbidity sensors using smaller volumes of Formazin turbidity calibration standards providing an affordable and reusable solution for long term sensor reliability. The unique design of the liquid calibration kit allows the UT700 sensor to be easily inserted and calibrated with the sensor in a horizontal position, allowing air bubbles to be evacuated through the integrated air-vent line ensuring superior accuracy of the sensor calibration. The kit has an easy to remove lid allowing users to fill and empty the calibration kit with DI water for vessel/sensor cleaning and Formazin calibration standards for sensor calibration.  

The precision, resolution and the low detection limit of the UT700 sensors are not affected by the calibration method, regardless of using certified Formazin standards and the kit. The calibration only affects the turbidity sensor accuracy. The nature of turbidity measurement makes an absolute turbidity value not easily obtainable for any sensor manufacturer although proper standards and methods are followed. For example, turbidity values greater than 1.0 NTU measured on real-world samples with different sensors, even from the single manufacturer, could differ significantly. For ultra-low turbidity (less than 0.3 NTU) measurement using the same methods (ISO- 7027 or EPA-180.1), it is likely that the values from different sensors can agree within 0.05 NTU. As such, the user should choose a calibration method and remain with the same calibration method for consistency. 

View Alarms  

Click the “Alarm” button in the menu bar to enter the Alarm report interface. 

All alarms will be displayed here. Alarms can be deleted as needed.  

Historical Data and Trending                                             

Click the “Data” button in the menu bar to enter the data report interface. 

Measurements for each parameter will be displayed here.  Time intervals for each measurement can be set here, as well as “Query” for data export.   Data export to USB will require opening display to access USB port.  

Historical Data  

The APH2O allows customer to adjust historical data interval to 1) reduce historical data file size, or 2) capture high resolution data if sensor values change rapidly. 

Historical Curves  

Click the “Curve” button in the menu bar to enter the Historical Curve interface. 

Adjustable graphs for each parameter are available here. Refer to the manual for adjusting curve ranges and time intervals.