Vaisala WAV151 - Manual (Page 19)

Chapter 4 ________________________________________________ Maintenance
VAISALA__________________________________________________________17
10. Remove the internal retaining ring at the bottom of the
shaft (using narrow-pointed pliers).
11. Remove the lower bearing.
12. Push out the shaft downwards through the upper body.
13. Remove the top bearing.
To reassemble the sensor, reverse the above work order. The
numbers in parenthesis refer to Figure 6 on page 19.
1. Take the previous steps in opposite order until
assembling the code disc.
NOTE Be careful when handling the new ball bearings. Do not
drop them or force them onto the shaft.
2. Attach the code disc (7) back onto the shaft. The disc
has to be positioned so that it does not touch the opto-
coupler on the printed circuit board (6). Tighten the
fixing screw of the code disc.
CAUTION Assure that the code disc does not touch the opto-coupler.
3. Attach the heating element outlet to the printed circuit
board. Put the printed circuit board in place and fasten
it with spacers (5).
4. Put the lower body assembly (4) carefully into place.
Fasten the three screws (3) at the bottom of the sensor.
Make sure that the bigger O-ring (14) is correctly
positioned between the upper and the lower sensor
bodies. Check also that the connector O-ring (14) is in
place. The O-ring is recommended to be replaced with
a new one after each opening.