A-96.250.511 / 091120
AMI Turbiwell
Maintenance
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6. Maintenance
6.1. Maintenance Schedule
The AMI Turbiwell is factory-calibrated using a primary standard
(formazine) prior to shipment. The instrument does not require any
further calibration before use. A verification is recommended quarter-
ly using the Swan Verification Kit, a secondary standard, instead of
calibration with a primary standard.
Recalibration with a primary standard is only necessary if verification
of the turbidity meter fails or after significant maintenance or repair
work.
Preventive maintenance frequency depends on water quality, on the
application, and on national regulations.
Turbidity below 1 FNU/NTU:
Turbidity above 1 FNU/NTU:
Every week Check sample supply for dirt.
Check sample flow.
Monthly Check measuring chamber for dirt. If necessary, clean it with a
brush and/or drain the measuring chamber. If there is a growth of
algae, disinfect the sample degasser and measuring chamber with
concentrated NaOCl. Use a pipette to dose the disinfectant.
Quarterly Perform a verification.
Yearly Dismount the sample degasser and clean it with a brush.
Daily to every
week
Check sample supply for dirt.
Check sample flow.
Weekly to
Monthly
Rinse the measuring chamber.
If the sample contains algae, disinfect the measuring chamber with
concentrated NaOCl. Use a pipette.
Quarterly Perform a verification.
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