Hach-Lange 2100P - Portable Turbidimeter Instrument - Manual (Page 13)

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4650098 intro.fm Description
Section 1 Description
1.1 General Description
The Hach Model 2100P Portable Turbidimeter (Figure 1) measures turbidity from
0.01 to 1000 NTU (=FNU). The instrument operates on four AA alkaline batteries
or with an optional battery eliminator. Rechargeable nickel-cadmium cells may be
used, but cannot be recharged in the instrument. The carrying case holds teh
instrument, all standard accessories, and the optional battery eliminator.
Figure 1 2100P Turbidimeter and Accessories
Note: Avoid prolonged exposure to ultraviolet light and sunlight.
Note: When taking a reading, place the instrument on a level, stationary surface. It should not be held in
the hand during measurement.
1.2 Accessories
Accessories supplied with the turbidimeter include six sample cells; one sealed vial
each of: <0.1-NTU, 20-NTU, 100-NTU, and 800-NTU StablCal® Stabilized
Formazin Standards; 4 AA alkaline batteries; 15 mL of silicone oil; oiling cloth;
carrying case; instrument manual; and quick reference card.
1.3 Principle of Operation
The Model 2100P Portable Turbidimeter operates on the nephelometric principle of
turbidity measurement. This instrument meets the design criteria specified by the
United States Environmental Protection Agency, Method 180.1.
The ratio optical system (Figure 2) includes a tungsten-filament lamp, a 90° detector
to monitor scattered light, and a transmitted light detector. The microprocessor