Comptus A70-DL0, Instruction Manual

Page: 11 / 22

11
Orientation
It is usually desirable to relate the wind direction
readings to True North. If a magnetic compass is
used the deviation from True North must be
determined. A topographical map contains this
information. For example if the deviation is 15
degrees West, a magnetic compass will indicate
15 degrees when pointed at True North. If the
deviation is East, then subtract it from 360 to
obtain the reading for True North.
Thehousing of the wind vane has a North alignment
mark molded into it. Refer to Figure 10. This must
be oriented so that it is toward the North. The
vane’s mounting holes are oriented such that the “S”
mast is on a North - South line with respect to the
vane. For installations using large, climbable towers
the vane may be oriented by pivoting the “S” mast in
the hose clamps. For smaller towers pivot the entire
tower until the “S” mast is properly aligned.
Do not press on the top of the vane as it may
damage the bearings. To install the wind vane,
grasp it about its lower body and press it with a
twisting motion onto the mast. Align the 1/8"
holes in the base of the wind vane with the holes
in the “S” mast. Secure the vane to the mast by
passing the cotter pin through the holes and tighten-
ing the set screw.
Slide the protective boot over the base of the
wind vane after wiring is complete. Tape its
base to the mast to secure it in place.
Wiring
Connect the end of the cable with the spade lugs
to the sensor using a #4 nut driver. There are
three brass studs with 4-40 thread that extend
from the bottom of the wind vane housing.
Attach the sensor cable to these studs being
careful to tighten only the outer #4 hex nut to 3
inch-pounds torque. If the inner nut is loosened
or the nuts are tightened simultaneously the stud
may rotate. This may result in a poor electrical
connection inside the wind vane. See Figure 9.
We recommend the system be assembled and
tested on the ground before final installation.
1. Select a suitable mounting location for the
Transmitter.
2. Mount the instrument to a wall or other
suitable panel using screws or bolts.
3. Refer to Figures 3 & 4. Connect the Red wire
of the signal cable to the Direction Vane Positive
“+” terminal. Tighten wind vane terminal to 3 inch
pounds.
4. Connect the Green (or White) to the Direc-
tion Vane Negative “-” terminal. Tighten wind
vane terminal to 3 inch pounds.
5. Connect the Black wire of the signal cable to
the Direction Vane Signal center terminal. Tighten
wind vane terminal to 3 inch pounds.
6. Connect the Red wire from the wind vane to
terminal #3 marked “WIND VANE +”.
7. Connect the Black lead from the wind vane to
the terminal #5 marked “WIND VANE SIG”.
8. Connect the Green (or White) lead from the
wind vane to terminal #4, the remaining wind
vane terminal.
9. Connect the Wind Direction current loop to
terminals 1 & 2 in the DIRECTION section
marked 4-20 ma. See Figures 5 & 6. Observe
polarity as marked.
Should additional cable be required up to 1000 feet
may be carefully spliced into the existing cable.
Take care to preserve the color code. AWG #18 -
#22 stranded copper wire with shield is recom-
mended.
Secure the sensor cable to the supporting struc-
ture at intervals of four feet or less. If the cable
is allowed to vibrate in the wind a broken cable
may result.