Vaisala CT25K - Internal Heater Subassembly CT25039 Replacement

Ceilometer CT25K
User’s Guide CT25K-U059en-2.1
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7. Turn the 6 screws at the bottom of the CT25K clockwise (Figure 8-8) and
push then slightly until they go through the holes in the gasket of the
connector flange. Then tighten the screws normally.
8. Tighten the screw that connects the CTP241 to the battery holder (Figure
8-8) to normal tightness.
9. Attach the cables to External Connectors J1-J4.
10. Turn the Ceilometer to vertical position and tighten the screws of the
pedestal.
11. Verify that the Ceilometer is operating properly.
8.9.3 Internal Heater Subassembly CT25039 Replacement
1. Remove the following connectors:
– Optics Monitor CTL21 connector P2
– Laser Transmitter CTT21 connector P3
– Receiver CTR21 connector P1
– Coaxial Cable CT3696 connector P1
2. Take a good hold on the CTB22 Optical Subassembly from the black part
with one hand. Do not touch the transmitter, receiver or the black cone on
the opposite side of the receiver. Open the two screws shown in Figure 8-
9 using a 6 mm hex key with the other hand.
3. Carefully remove the optics subassembly. Do not touch the compensation
fiber. Place the optics subassembly carefully on the table so that the laser
transmitter and the receiver do not touch the table.
4. Open the four nuts at the corner of the internal heater.
5. Disconnect the wires and replace the heater with a new subassembly.
6. Assemble CTB22 Optical Subassembly and cables back in their original
positions.