SCHOTT Instruments AVS 470 Mode D'emploi page 67

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Chapter 6 Maintenance and care of the AVS 470 Viscosity Measuring Unit and the viscometers
Liquids whose components adhere to the glass wall also cause errors. In such cases, regular cleaning is required
whereby the corrosive action cleaning agent on the glass must be eliminated.
For this reason, we recommend that the user should write up a special processing instructions for all important
measurements and include them in his quality assurance manual in accordance with DIN EN ISO 9001. In all cases
the user is responsible for the correctness of his measuring and testing equipment and is not released from his
responsibility for quality (cp. DIN 55 350, Part 18).
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