Hach-Lange Sigma SD900 Portable - Manual (Page 64)

62
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 2 on page 9 and to Replacement parts on page 69 .
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 25 ).
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 section 7.3 on page 67 ).
6.5 Desiccant replacement
A desiccant cartridge is located inside the controller to absorb
moisture and prevent corrosion. Over time the desiccant will
become saturated with moisture and should be replaced.
Monitor the desiccant color through the clear plastic window
(
Figure 26 ). The color will change from yellow to green when the
desiccant is saturated.
Prerequisites:
• Desiccant
• Silicone grease
Note: See Replacement parts on page 69 for ordering information.
Figure 25 Distributor assembly
1 Nozzle 4 Shaft
2 Distributor arm 5 Tube
3 Distributor motor