ABB TB404, Инструкция по эксплуатации, Страница: 37 / 40

PROCEDURE
PR6 - 2
Acid Dip
This method removes scales caused by hard water.
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1. Verify that any process fluid on the sensor is not incompatible with HCl.
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2. Put on gloves, eye protection, safety shields and other protective items
as needed for protection.
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3. Dip the donut portion of the sensor into a one percent to five percent
solution of HCl until this region is free of the unwanted coating. Do not
expose any of the metal on the sensor to this solution or corrosion may
occur.
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4. Rinse the sensor with water.
Solvent Dip
This method removes organic coatings.
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1. Verify that any process fluid on the sensor is not incompatible with iso-
propyl alcohol or other appropriate solvent.
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2. Put on gloves, eye protection, safety shields and other protective items
as needed for protection.
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3. Dip the sensor into the solvent. Do not use a solvent that is known to be
incompatible with the plastic of the sensor.
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4. Remove the solvent using a clean cloth.
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5. Rinse the sensor with soap and water.
Physical Cleaning
This method removes especially thick scales and accumulations.
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1. Use a rag, acid brush or tooth brush to clean the sensor.
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