Hach Lange 2100AN, Instrument Manual

Page: 27 / 108

SECTION 2,
continued
27
Figure 3 Filtering Apparatus
Figure 4 Sample Filtering
2.3.7.2 Using Cell Adapters
Cell adapters are used with the Model 2100AN Turbidimeter when sample cells
smaller than the standard 25-mm cells are required. A wide variety of test tubes,
sample cells and ampules can be used with the cell adapters. Small diameter
sample cells are useful with the instrument when only a small quantity of sample
is available, the sample to be measured is in an ampule and cannot be opened, or
the sample is too turbid for use with the standard sample cell. A shorter light path
permits measurement of high-range samples without the need for sample dilution.
Adapters are available for test-tube diameters of 12- to 13-mm, 16-mm and
19-mm O.D. The 12- to 13-mm adapter accommodates either 12-mm or
13-mm tubes. The minimum sample volumes that must be used are 2.5 mL
for 12-mm tubes, 3.5 mL for 13-mm tubes, 5 mL for 16-mm tubes and 7 mL
for 19-mm tubes.