Watts HF scientific 28052, Owner'S And User'S Manual, Page: 48 / 67

Catalog No. 29290 41
Rev 3 06/2020
4.3.2 Indexing Calibration Cuvettes
To achieve the greatest accuracy, and account for normal scratches and
aberrations in cuvette glass when calibrating, HF Scientific recommends
indexing the cuvettes.
Standards and standard kits purchased from HF Scientific are supplied
with indexing rings. Complete instructions regarding how
to index the cuvettes are included in the calibration kits.
The following steps allow repeatable indexing of
calibration standards:
1. With the instrument operating in AUTO mode insert
the standard into the optical well.
2. Slowly rotate the standard, inside the optical well, one
complete revolution (360º). While rotating the
standard slowly, observe the measured turbidity and locate the position
of the cuvette having the lowest reading.
3. With the calibration standard positioned at the location having the
lowest turbidity reading, install the Indexing Ring over the cap on the
standard so that the pointer of the Indexing Ring faces directly forward.
When using the standards in the future, always insert the standard so that
the pointer of the indexing ring faces forward. Slowly rotate the standard
back and forth about 5
°
to find the lowest point. The standard is now
indexed and ready for use.