Campbell Scientific 014A Met One Wind Speed Sensor - Manual (Page 29)

Appendix C. Sensor Maintenance
C.1 Reed Switch Replacement Procedure
To verify parts and locations, refer to the cable and parts diagrams (FIGURE
C-2 and FIGURE C-3) and the parts list (TABLE C-1).
A. Remove sensor from mounting arm and disconnect cable.
B. Remove the cup assembly.
C. Remove the three Philips screws at the top of the sensor and lift out the
bearing mount assembly.
D. Unsolder the leads of the reed switch and remove the switch from the two
mounting terminals, see the parts diagram.
E. Solder the new switch onto the sides of the switch mount terminals (form
a loop in the relay leads to obtain proper lead length -- DO NOT CUT
THE RELAY LEADS.) Measure the distance between the bottom of the
rotating magnet and the top of the switch envelope, as shown in FIGURE
C-1. The spacing should measure between 0.01 and 0.02 inches.
F. Spin the shaft to verify switch operation by listening for a faint sound of
the switch closure. If the switch cannot be heard, move the switch slightly
closer to the magnet assembly.
G. Reassemble sensor.
FIGURE C-1. Reed switch assembly
C.2 Bearing Replacement Procedure
The bearings used in the 014A sensor are special stainless steel ball bearings
with a protective shield. Bearings are lubricated and sealed. DO NOT
LUBRICATE BEARINGS AS THE LUBRICATION WILL ATTRACT
DUST AND INHIBIT BEARING OPERATION.
A. Follow steps A, B, and C in reed switch replacement procedures.
B. Loosen set screws in magnet assembly, lift shaft and collar up and out of
bearing mount. Be sure to retain lower spacer.
C-1