Fuse Replacement; Pump Maintenance - Hach SD900 Manuel D'utilisation De Base

Figure 12 Desiccant cartridge
1 Plug
2 Desiccant tube

Fuse replacement

Fuses are not user-serviceable items. The need for fuse replacement in controllers indicates severe
technical failure and is therefore considered to be a service activity. If a blown fuse is suspected,
contact Technical Support.

Pump maintenance

Pinch hazard. Remove power from the instrument before maintenance or service activities are done.
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 reminder message is shown or 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 the expanded version of
this manual.
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
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