Hach-Lange WPC-22 - Manual (Page 17)

9. Connect the sample line and drain line tubing. Refer to Plumb the
instrument on page 11.
10. Start the flow of water to the instrument.
11. Set the power switch to on.
12. Close the enclosure door. Tighten all four captive screws that attach
the enclosure door.
Figure 10 Clean the sensor flow cell
Replace the desiccant pack
Replace the desiccant pack when the color of the crystals in the
desiccant pack change from blue to pink. Refer to
Figure 1 on page 6 for
the location of the desiccant pack.
A desiccant pack must be used to prevent moisture build up in the
instrument enclosure. This will help prevent corrosion of sensitive
electrical connections and help prevent the collection of condensation in
the sensor assembly.
Items to collect:
• Desiccant pack
• Velcro adhesive strip
1. Open the enclosure door. Loosen all four captive screws that attach
the enclosure door.
2. Set the power switch to off.
3. Open the electrical access panel. Turn the two ¼-turn captive screws
only ¼ turn.
4. Replace the desiccant pack.
a. Pull the used desiccant pack off the Velcro strip on the rear panel
and discard.
b. Put an adhesive Velcro strip on a new desiccant pack.
c. Push the desiccant pack on the Velcro strip on the rear panel.
5. Close and attach the electrical access panel with the two ¼-turn
screws.
6. Set the power switch to on.
7. Close the enclosure door. Tighten all four captive screws that attach
the enclosure door.
Replace a fuse
D A N G E R
Fire hazard. Use the same type and current rating to replace fuses.
D A N G E R
Electrocution hazard. Remove all power from the instrument and relay
connections before this maintenance task is started.
Items to collect:
• Fuse, 5 x 20 mm T, 0.500 mA, 250 V
• Phillips screwdriver
1. Open the enclosure door. Loosen all four captive screws that attach
the enclosure door.
2. Set the power switch to off.
English 17