The Comparator System for Colorimetric Chemical Analysis

The Comparator System is based on the following system components:

1. Comparator instrument to bring the treated sample and the glass filters together for color matching

2. Lighting unit (optional) to ensure constant viewing conditions for color matching

3. Color grading disc containing a series of glass filters which have been graded to give direct concentration values

4. Sample container of the required path length

Using the Comparator System 2000

1. Follow the test method for sample preparation, adding the specified reagent to a known volume of sample in the appropriate sample container

2. Insert the test disc into the comparator instrument

3. Place the sample container in the right hand comparator compartment, and, if specified in the test method, a cell containing a blank of water or untreated sample in the left hand side

4. Using standardized lighting, rotate the disc until the closest color match with the sample is obtained

5. The value will be shown in the window in the comparator instrument.

Medical & Clinical Tests

1. Select the appropriate test from the list below

2. Select the disc(s) with the required measuring range

3. In addition to the disc(s), it is necessary to use the comparator instrument, reagent and glassware as listed