Pump Maintenance; Replace The Pump Tubing - Hach AS950 Manual Del Usuario

5. Apply silicone grease to the O-ring.
6. Install the desiccant tube in the controller.
Figure 13 Desiccant cartridge
1 Plug
2 Desiccant tube

7.3 Pump maintenance

Pinch hazard. Remove power from the instrument before maintenance or service activities
are done.

7.3.1 Replace the pump tubing

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
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.
3 O-ring
4 Desiccant window
C A U T I O N
N O T I C E
Figure 14.
English 21