Ci7XX0 BENCHTOP SPECTROPHOTOMETER
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R/T correlation - Ci7XX0 to Ci7000A
Testing has shown that to achieve the best correlation between a Ci7XX0 to a Ci7000A the
following combinations of transmission port, stops, and aperture plates should be used:
• 25mm transmission port, with 25 mm stop and 25 mm aperture plate with white reflective
ring
or
• 17mm transmission port, with 17 mm stop and 17 mm aperture plate with white reflective
ring
Liquid Measurements
Measurement and Calibration Notes
• Liquids should be measured using the total transmission technique, never use direct
transmission for liquids
• Be very careful with placement of the cuvette, make certain it is positioned square and
flush to the sphere opening
• Make sure the cuvette’s position is centered over the opening in the sphere
• Perform white calibration with cuvette and clear liquid in the sample holder
• The clear liquid should be the base of whatever material you are working with
• When performing black calibration the blocker should be positioned between the cuvette
and the opening in the sphere
Cuvette Cleaning and Handling
• Care should be taken to ensure the cuvette and holder is kept clean. Carefully wash the
holder and cuvette in warm, soapy water and rinse thoroughly.
• Never touch the cuvette windows with your fingers as the oils in your skin will etch the
windows. Handle the cuvette by the edges.
• Always leave an air gap between the bottom of the lid and the top of the liquid sample.
The force of pressing the lid against the liquid sample can cause the windows to be
weakened and crack.
• Extreme care should be taken to prevent the sample liquid from being spilled into the
transmittance chamber. NEVER FILL THE CELL WHILE IT IS IN THE TRANSMISSION
COMPARTMENT.
Procedure:
1. Loosely attached the cell stand assembly to the carriage base with two thumb screws. A
clamp is not required for this measurement.
2. Slide the cell stand forward and tighten the thumb screws.
3. Make sure the cuvette is clean (see Cleaning and Handling). Carefully fill the cuvette with
the sample liquid until the liquid is approximately 8 mm from the top. If any liquid spills
on the sides of the cuvette, wipe it off with a clean cloth.
4. Insert the cuvette into the cell stand.
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