Hach-Lange 2100P - Portable Turbidimeter Instrument - Manual (Page 14)

Page 14
Preparation for Use
4650098 intro.fm
Section 1, continued
calculates the ratio of the signals from the 90° and transmitted light detector. This
ratio technique corrects for interferences from color and/or light absorbing materials
(such as activated carbon) and compensates for fluctuations in lamp intensity,
providing long-term calibration stability. The optical design also minimizes stray
light, increasing measurement accuracy.
Figure 2 Ratio Optical System
1.4 Preparation for Use
1.4.1 Battery Installation
The instrument is shipped without the batteries installed. Before use, install the four
AA alkaline batteries (Figure 3) or connect the battery eliminator. For battery
operation:
1. Remove the battery compartment cover on the instrument bottom.
2. Install the batteries.
3. Correct battery polarity is shown on the battery holder. Reinstall the battery
compartment cover.
Lamp
Transmitted
Light
Detector
90°
Detector
Sample
Cell
Lens