Lovibond 3000 Series, Operator'S Instruction Manual, Page: 4 / 16

Comparator 3000 Series
Introduction
The Lovibond
®
Comparator 3000 Series instruments are single scale
3-field instruments used for visual grading to determine the colour of a
sample, achieved by direct comparison of Lovibond
®
Glass Standards and
the liquid sample.
To achieve rapid colour grading within pre-determined colour limits, the
glass standards are mounted in two discs so that it is easy to check that
the sample is within tolerance.
The two discs containing the relevant colour scale are brought together
by a prism and viewed simultaneously alongside the sample making it
easier to achieve an optimum match.
When seen through the prism, the sample is viewed in the centre. The
colour standards are viewed either side of the sample, as in the following
diagram:
The human eye perceives colour differently according to the lighting
conditions, so constant lighting conditions are essential for consistent
colour comparison. The Comparator 3000 Series uses a tungsten halogen
lamp which is colour corrected to CIE standard Illuminant C to produce a
consistent light source.
1
Colour
Standard Sample
Colour
Standard