Daily Rounds and Autocalibration Check

  • Daily Rounds (Before Autocalibration)The purpose of this inspection trip is to catch and repair system problems before calibration. Any repair or maintenance requiring more than 20 minutes must be documented in the book. {thumbnail of book} Before any repair, cleaning, or adjustments are made the data system should be put in the "Maintenance" Mode by activating the "virtual switch".
  • Check pressure in calibration gases and nitrogen purge cylinder.

    • Any cylinder showing less than 200 psig must be replaced before calibration. If the reported concentration of analyte in the replacement cylinder is different from the old cylinder the value must be changed for that calibration gas within the data system in the Evaps Control Room. Changing Calibration Known Values for New Cylinder Gas

    2. Check the flow of nitrogen to the Perma Pure dryer. The rotameter should be just slightly above 3.

  • Adjust needle valve as required. Avoid sudden large changes.
  • Note on the schedule card if Air Conditioner Filter is due for cleaning. Follow the prescribed procedure in Cleaning the Boiler 4 CEM Air Conditioner.
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  • Note temperature of cabinet on circular dial. Should be less than 90°F. If higher, air conditioner may be faulty. Enlist aid of I&E for help with AC.

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    5. Note temperature of sample line. It should be above 215°F. If less determine cause consult instruction manual for assistance.

  • 6. Note flowrates on two rotoameters on M&C SCS. Left should be between 1.2 and 1.6 and right should also be in the same range. Excessive flow moves water through the chiller and causes flow problems.

    • Anything less indicates restriction between sample probe and analyzer cell. Most likely restriction is in sample line near or at the primary filter. There is a stainless steel fitting at the sample probe assembly on the flue that plugs with solid sodium sulfite. Sample line and Filter Service

  • Checks after daily autocalibration

  • All the items in the upper left hand corner of #4 boiler CEM must be green and showing the word NORMAL.

  • If any of the calibration showed an ALARM the cause of the failure must be found and corrected. Most often that will be a calibration cylinder gas problem such as unexpectedly empty.

  • After cause of failure has been identified, corrected and documented in the book another calibration must be done. If the failure was simple redoing the autocalibration will suffice. Remember to note in the book the name of these subsequent calibrations so they can be found later. However, if the cause was legitimate drift of the analyzer, evidenced by no other know or identified cause, then a manual calibration of the analyzer will have to be done.

  • Before any repair, cleaning, or adjustments are made the data system should be put in the "Maintenance" Mode by activating the "virtual switch".

  • The instruction manual for the analyzer is obtuse and presupposes an intimate knowledge of the unit. Follow the steps in Manual Calibration for the Servomex to manually calibrate the Servomex analyzer.



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