Vaisala CL31 - Page 122

USER'S GUIDE____________________________________________________________________
120 _________________________________________________________________ M210482EN-D
3. Close the enclosure door and remove the measurement unit. To do
this, loosen the three attachment screws (marked A in Figure 6 on
page 28, disconnect the blower cable from
connector J1 (see Figure
11 on page 34) and pull out the unit.
4. Re
move the metal plate protecting the heater by loosening its two
screws.
5. Disconnect the battery, transmitter, receiver, and data cables (refer
to numbers 3, 4, 8, 10 and 16 in Figure 22 on page 104) from the
CLE321 board.
6.
To rem
ove the Optics Unit (refer to number 9 in Figure 22), first
remove the holder plate by loosening the four Allen screws on its
front cover.
7.
Detach the internal heater connector and holding the cable aside,
carefully pull out the Optics Unit upper end first.
NOTE
Do not touch the lens of the Optics Unit.
8. Detach the CLM311 twisted pair cable (refer to number 15 in
Figure 22) from the CLE321 board.
9. To rem
ove the internal heater, use an Allen key or a short
screwdriver and loosen the three screws attaching the heater to the
left wall of the measurement unit enclosure. Then slide out the
internal heater.
10. Slide the new internal heater to its place and hold it there while
tightening the three screws.
11. Attach the CLM311 twisted pair cable to the CLE321 board.
12. Slide the optics tube to its place with the bottom end first. Make
sure no cables get stuck between the optics tube and other
ceilometer components.
13. Snap the internal heater connector to its place.
14. Place all heater cables behind the holder and tighten the four holder
screws.
15. Reconnect the battery, transmitter, receiver, and data cables to the
CLE321 board.
16. Reattach the metal plate protecting the internal heater.
17. Insert the measurement unit inside the shield, reconnect the blower
cable to connector J1, and tighten the three attachment screws.
18. Connect the power cable to connector J2.
19. Switch on the power with all three switches. Wait until the
Laser
on
LED starts blinking at 2-second intervals. Ensure that all six
diagnostic LEDs are lit. Refer to Figure 26 on page 111.