Hach AS950 Basic Installation And Maintenance page 21

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