Hach-Lange SURFACE SCATTER 7 sc Turbidimeter - Manual (Page 22)

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Installation
3.3.5 Installing the 3-way ball valves
CAUTION
Installation should be performed by qualified technical
personnel to ensure adherence to all applicable electrical and
plumbing codes.
Refer to the Auto Flush Kit Instruction Sheet (Cat. No. 46692-88)
for complete installation instructions.
3.4 Installing a sample line
Sample lines diameter must be appropriate for the sample type.
Choose a line size that minimizes lag time, but also minimizes
plugging with solids.
• Route the sample line as directly as possible.
• Using long or large diameter sample lines will result in a
significant lag time between actual process conditions and
instrument measurements.
• When larger diameter sample lines or long distances are
unavoidable, increase flow to the instrument and bypass
excess flow to the drain or back to process.
• Install sample line taps into larger process pipes to minimize
the chances 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.
Figure 11 shows both good and poor methods of
installing a sample tap.
Figure 10 Heat exchanger dimensions