Hach-Lange POLYMETRON 9611 sc Installation - Manual (Page 9)

N O T I C E
To prevent backpressure and damage to the analyzer, make sure that the
analyzer is higher than the facility drain(s) used and that the drain line has a
constant downward slope.
N O T I C E
The pressure regulator is set to a fixed pressure and cannot be changed.
Use the supplied tubing (6 mm), Y-strainer with filter and pressure
regulator to plumb the drain and the sample to the analyzer. Refer to
Figure 5 . The sample line tubing that goes into the plumbing access
ports must be 6 mm. Tubing of 1/4 in. may be used for the sample line
up to the valve/y-strainer but not into the plumbing access ports of the
analyzer.
Figure 5 Sample and drain lines
1 Sample in (single-
stream)
4 Non-adjustable
pressure regulator
(set at 4 psi to protect
analyzer)
7 Case drain
2 Shut-off valve 5 Sample bypass drain
3 Y-strainer with filter 6 Chemical drain
Sample line guidelines
Select a good, representative sampling point for the best instrument
performance. The sample must be representative of the entire system.
To prevent erratic readings:
English 9