Avoiding Errors In Photometric Measurements - MERCK Spectroquant Picco COD Mode D'emploi

1 General notes

1.2 Avoiding errors in photometric measurements

1. The outside of the cell must be clean and dry before starting the analysis. Clean the
outside of the cells with a paper towel. Fingerprints or other marks must be removed.
2. The cells must be positioned in the measurement compartment for zeroing and test
with the mark (mark) on the cell aligned with the mark on the instrument.
3. Always perform zeroing and tests with the cell cap tightly closed.
When using the 16-mm round cell the adapter for 16-mm cells must be attached to the
measurement compartment. For all measurements the measurement compartment
must be protected using the enclosed compartment lid.
4. Bubbles on the inside wall of the cell lead to incorrect measurements. To prevent this,
remove the bubbles by swirling the cell before performing the test.
5. Avoid spillage of water in the measurement compartment. If water should leak into the
instrument housing, it can destroy electronic components and cause corrosion.
6. Contamination of the lense in the measurement compartment can result in errors.
Check at regular intervals and - if necessary - clean the light entry surfaces of the
measurement compartment using a moist paper towel, cotton swabs, or similar.
7. Large temperature differences between the instrument and the enviroment can lead to
errors - e. g. due to the formation of condensation in the area of the lens or on the cell.
8. To avoid errors caused by stray light do not use the instrument in bright sunlight.
Release 03/2009
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Spectroquant Colorimeter Picco COD / CSB
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