Pump Maintenance - Hach AS950 Instalación Y Mantenimiento Básicos

• Refrigerator—clean the condenser fins and coils as needed with a brush or vacuum.
• Sampler cabinet and tray—clean the internal and external surfaces of the sampler cabinet with a
damp cloth and mild detergent. Do not use abrasive cleaners or solvents.
7.2 Replace the desiccant
A desiccant cartridge in the controller absorbs moisture and prevents corrosion. Monitor the
desiccant color through the window. Refer to
green, replace the desiccant.
1. Unscrew and remove the desiccant cartridge. Refer to
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
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.
Figure 13. Fresh desiccant is orange. When the color is
Figure 13.
3 O-ring
4 Desiccant window
C A U T I O N
N O T I C E
Figure 14.
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