TM 10-4320-303-13
2.5.5. 7 Performing Chlorine Residual Tests .
a. Locate color comparator kit.
Figure 2-49. Install Chlorine Color Disc.
CAUTION
If wrong disc is used, chlorine residual test results will be incorrect.
Make sure tag on disc reads either DPD CHLORINE or CHLORINE.
b. Remove two screws (Figure 2-49, 1) and front cover (2) from comparator body (3).
c. Place chlorine color disc (4) in comparator body (3) with numbers (5) facing outward. Place front
cover (2) over chlorine color disc (4). Ensure that number display window (6) is at top of comparator
body (3). Install and tighten screws (1).
Figure 2-50. Installation of Prism Eyepiece
d. Place prism eyepiece (Figure 2-50, 1) over sample cell windows (2) on comparator front cover (3).
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