Met One Instruments 020C Operation Manual page 4

(Refer to Figure 2-1 "Typical 020C Installation"). The Orientation screw located on
the stem of the sensor is to be oriented so that it points south. Proceed as follows:
A. Tape the sensor hub and column together so that the notches on each part are
exactly aligned.
B. Loosen the two set screws in the alignment bushing so that the sensor and
bushing may be rotated.
C. Rotate the sensor so that vane (counterweight end) points directly south.
D. A transit located either directly south or directly north will facilitate the alignment
process; merely rotate sensor until vane and sensor column merge completely,
then tighten the set screws into the mounting bushing.
E. Optional alignment accessories are available:
1. A telescopic orientation device, which is inserted into alignment bushing
until alignment is achieved. Bushing is locked and orientation device is
removed and wind direction sensor installed.
2. A compass orientation device operates in similar manner, but is not
suitable for steel towers or poles.
2.3 Wiring
The cable assembly contains five wires. Typical wiring hookup is shown in Figure 2-1.
2.4 Lightning Protection
Weather sensors are sensitive to direct or nearby lightning strikes. A well-grounded
metal rod or frame should be placed above the sensor installation. In addition, the
shield on the signal cable (white/brown wire) must be connected to a good earth
ground at the translator end, and the cable route should not be vulnerable to
lightning.
020C-9800 REV A Page 3