Acromet WG-602 Manual
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Contents
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295.2.4 Routine MaintenanceTurbidity Calibration1) Take a sample of water from the flow cell2) Test the sample using an accurate digital turbidly meter3) Press Menu until NTUl Calibrated to or NTUh Calibrated to appears in the LCD display.If calibrating below 1.0 NTU use NTUl (low) if calibrating above 1.0 NTU use NTUh (high).4) Press OK.5) Enter the password. Press the up arrow or down arrow until the password is reached.6) Press OK.7) The value that appears is the last calibrated value.8) Press OK again.9) Press the up arrow or down arrow until the value is the same as the independent digital turbiditymeter.10) Press OK to save the new calibration or Esc to abort without saving.11) Press Esc to return to the main display.Note: Only 1 Turbidity calibration will be active. If the measured Turbidity is less than 1.0, only theNTUl calibration will be active; if the turbidity is greater than 1.0, only the NTUh calibration will be active.5.2.5 Cleaning the Turbidity SensorThe turbidity meter will need to be periodically cleaned to ensure proper operation and reliability. Thecleaning frequency will depend on the water source being tested. The meter should be cleanedwhenever the measurement accuracy is questionable and before calibration.1) Turn off power to the analyzer.2) Shut off the flow to the turbidity flow cell and remove the turbidity meter.3) Rinse out the flow assembly with clean water to remove any sediment that may have been trapped inthe flow cell.4) Wash the turbidity meter under clean water and a cloth to remove any debris and oil. Be careful notto scratch the sensor covers.5) If installed, inspect the wiper for signs of wear and replace if necessary.6) Reinstall the meter and turn the flow back to the meter.7) Confirm that the meter is operating properly and that the flow cell is sealed.5.2.6 Shut-down and Winterizing1) Disable the Turbidity measurement in the technician menu2) Shut off the flow of water to the turbidity flow cell3) Open the drain at the bottom of the flow cell to drain all water4) If temperatures will drop below freezing, remove the turbidity sensor and store in a safe locationwhere temperatures will not drop below freezing. |
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