Hach-Lange SD900 Refrigerated Sampler, SD900 AWRS User Manual - Manual (Page 38)

N O T I C E
Do not attempt to clean the controller compartment heater with liquids of any kind.
If water is not sufficient to clean the controller and the pump, disconnect the controller and move the
controller away from the sampler. Allow sufficient time for the controller and pump to dry before the
parts are re-installed and put back into service.
Clean the sampler as follows:
• 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.
Replace the desiccant
A desiccant cartridge in the controller absorbs moisture and prevents corrosion. Monitor the
desiccant color through the window (
Figure 15 ). Fresh desiccant is yellow. When the color is green,
replace the desiccant.
1. Unscrew and remove the desiccant cartridge ( Figure 15 ).
2. Remove the plug and discard the spent desiccant.
3. Fill the desiccant tube with fresh desiccant.
4. Install the plug.
5. Apply grease to the O-ring.
6. Install the desiccant tube in the controller.
Figure 15 Desiccant cartridge
1 Plug 3 O-ring
2 Desiccant tube 4 Desiccant window
Pump maintenance
C A U T I O N
Pinch hazard. Remove power from the instrument before maintenance or service activities are done.
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 reminder message is shown or when the tubing shows signs of wear.
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