Hach-Lange SIGMA SD900 Refrigerated Sampler and All Weather Refrigerated Sampler User Manual - Manual (Page 82)

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Maintenance
6.4 Distributor arm tubing replacement
The distributor arm moves over each bottle during multiple bottle
sampling. Inspect the tubing in the distributor arm on a regular
basis. Replace the tubing when deteriorated or at regular intervals.
Prerequisites:
• Tubing, distributor arm, pre-cut. Make sure that the correct tube
is used for the correct distributor and distributor arm. Refer to
Figure 3 on page 11 or Figure 4 on page 12 and to
Replacement Parts and Accessories on page 93 .
Procedure:
1. Remove the old tubing from the distributor arm.
2. Insert the new tubing into the distributor arm so that the end of
the tubing extends out of the nozzle no more than 1 / 8 inch
( Figure 36 ).
Note: Do not let the tubing extend more than 1 / 8 inch past the nozzle
end of the arm. If the tubing extends too far, the tubing will get caught
on the bottles and interfere with sampling.
3. To make sure that the distributor is aligned properly, run the
manual distributor diagnostic (see Diagnostic tests on
page 90 ).
Figure 36 Distributor assembly
1 Nozzle 4 Shaft
2 Distributor arm 5 Distributor tube
3 Distributor motor