A-96.250.511 / 091120
AMI Turbiwell
Maintenance
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6.5. Verification
Due to the technology and design of the instrument, a calibration is
not required. However, a periodic check of the instrument perfor-
mance can be performed. The check can be performed either with
a Swan Verification Kit or with a wet verification. To find out which
methods are approved, contact your local regulatory authority.
6.5.1 Swan Verification Kit
There are two different types of Swan Verification Kits:
Solid verification kits consisting of a glass prism with a defined
turbidity value:
– 7027 High
– 7027 Low
– W/LED High
– W/LED Low
Liquid verification kit: A small cuvette that can be filled with an
aqueous suspension or emulsion.
Note: For solid verification kits, a recertification is recommended
every two years.
The procedure is essentially the same for both types of verification
kits. If a liquid verification kit is used, also follow the instructions for
filling in section Verification Kit Turbiwell Liquid, p. 69.
Matching Each verification kit has to be matched with the latest calibration be-
fore it can be used for a verification. The <Matching> function can be
started in menu <Maintenance>/<Matching>.
Up to 10 Verikits can be matched for one AMI Turbiwell. An existing
Verikit can be overwritten but not deleted.
Note: It is very important that the drainage valve is closed during
the matching process. Otherwise wrong measured values
caused by residual light will result.
• Instruments equipped with automatic drainage: No action
necessary. The drainage valve opens and closes automatically.
• Instruments with a manual drainage valve: Close the drainage
valve before matching.
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