6. Attach the external retaining ring.
7. Attach the chopper disc onto the shaft. Make sure the disc is positioned so that the disc
teeth do not touch the opto-coupler on the circuit board. Tighten the screw.
Make sure that the chopper disc teeth do not touch the opto-
coupler. There must be 1 ... 2 mm space between the bottom of the opto-
coupler and the disc teeth.
CAUTION!
Be careful when handling the new ball bearings. Do not drop them or force
them onto the shaft.
8. Attach the heating element outlet to the circuit board. Put the circuit board in place and
fasten it with spacers.
9. Put the lower body assembly carefully into place.
Make sure that the bigger O-ring between the upper and lower sensor bodies is in place
and fasten the three screws at the bottom of the sensor.
Vaisala recommends replacing the O-ring with a new one when opening the
assembly for maintenance.
10. Tighten the hexagon nut of the connector.
11. Connect the cable plug to the sensor body connector. Fasten the sensor body on the
cross arm with three screws.
12. Mount the cup assembly onto the sensor body. Tighten the fixing screw.
Replacing the heating resistance element requires special
tools. To avoid any damages, Vaisala recommends that the manufacturer
replaces the heating element.
CAUTION!
Chapter 4 – Maintenance
15
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