Hach SD900 Manuel D'utilisation De Base page 22

Electrocution hazard. Remove power from the instrument before doing maintenance or service
activities.
Biohazard exposure. Obey safe handling protocols during contact with sample bottles and sampler
components.
Multiple hazards. The technician must make sure that the equipment operates safely and correctly
after maintenance procedures.
Clean the instrument
Fire hazard. Do not use flammable agents to clean the instrument.
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
replace the desiccant.
1. Unscrew and remove the desiccant cartridge
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.
22 English
D A N G E R
W A R N I N G
W A R N I N G
C A U T I O N
N O T I C E
(Figure 12). Fresh desiccant is yellow. When the color is green,
(Figure 12).