Hach-Lange CL17 USER MANUAL - Manual (Page 15)

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Installation
3.5 Installing the sample line
Selecting a good, representative sampling point is important for optimum performance of
the instrument. The sample analyzed must be representative of the condition of the entire
system. Erratic readings will be seen if sample is drawn from a location too close to
points of chemical additions to the process stream, if mixing is inadequate, or if the
chemical reaction is incomplete.
If the sample pressure into the instrument exceeds 5 psig at the analyzer inlet, flooding
and instrument damage may result unless the sample conditioning kit is installed.
Install sample line taps into the side or center of larger process pipes to minimize the
chance of ingesting sediment from the pipe line bottom or air bubbles from the top. A tap
projecting into the center of the pipe is ideal. Refer to
Figure 6 .
Figure 5 Plumbing connections (bottom view)
1 Front of instrument 3 Sample drain. Instrument drain fitting is sized for ½ in.
ID flexible tubing
2 Enclosure drain 4 Sample inlet. Quick connect fitting for ¼ in. O.D. tubing