5.2 Replace the desiccant
A desiccant cartridge in the controller absorbs moisture and prevents corrosion. Monitor the
desiccant color through the window. Refer to Figure 13. Fresh desiccant is orange. When the color is
green, replace the desiccant.
1. Unscrew and remove the desiccant cartridge. Refer to Figure 13.
2. Remove the plug and discard the spent desiccant.
3. Fill the desiccant tube with fresh desiccant.
4. Install the plug.
5. Apply silicone grease to the O-ring.
6. Install the desiccant tube in the controller.
Figure 13 Desiccant cartridge
1 Plug 3 O-ring
2 Desiccant tube 4 Desiccant window
5.3 Pump maintenance
C A U T I O N
Pinch hazard. Remove power from the instrument before maintenance or service activities
are done.
5.3.1 Replace the pump tubing
N O T I C E
Use of tubing other than that supplied by the manufacturer can cause excessive wear on
mechanical parts and/or poor pump performance.
Examine the pump tubing for wear where the rollers rub against the tubing. Replace the tubing when
the tubing shows signs of wear.
Pre-requisites:
• Pump tubing—pre-cut or bulk 4.6 m or 15.2 m (15 ft or 50 ft)
1. Disconnect the power to the controller.
2. If the bulk tubing is used, cut the tubing and add alignment dots. Refer to Figure 14.
3. Remove the pump tubing as shown in the illustrated steps that follow.
4. Clean the silicone residue from the interior of the pump housing and from the rollers.
5. Install the new pump tubing as shown in the illustrated steps that follow.
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