Rain Bird Pro - WIND DIRECTION; SOLAR RADIATION SENSOR PYRANOMETER

Weather Station - Model “PRO”
Nov., 2001 Page 48
Model “PRO”- Weather Station
Cozz GT27145B
Refer to schematic wiring diagram -
located in the Appendix - FIGURE 29
• Measure the resistance from P1 to G
(pins 3 to 5) of the Wind Speed
Sensor. Slowly turn the wind speed
cup. The resistance should vary
from infinite to less than 1 OHM as
the reed switch closes in the
anemometer.
WIND DIRECTION
Refer to schematic wiring diagram -
located in the Appendix - FIGURE 29
• The Wind Direction sensor varies in
its resistance as the vane turns.
With the OHM meter connected to
E2 and 2H (pins #1 & #2) the
resistance should vary from 11K
OHMS to 21K OHMS.
• If infinite resistance is measured,
then the wiper in the potentiometer is
most likely damaged and the sensor
needs to be repaired.
• With the OHM meter connected to
2H & AG (pins #2 & #4) the
resistance should vary from 1K to
11K OHMS with change in wind
direction. If infinite resistance is
measured then the potentiometer is
bad and should be replaced.
SOLAR RADIATION SENSOR
PYRANOMETER
Refer to schematic wiring diagram -
located in the Appendix - FIGURE 30
• The Solar Radiation Sensor
(Pyranometer) should measure
between 40 OHMS and 90.2 OHMS,
when checked with an Ohm meter
between 3H & 3L (pins #1 & #2).
• Set meter for lowest DC millivolts (a
very sensitive meter is required) and
measure from 3H to 3L (pins #1 &
#2). The small voltage should vary
with variation in light intensity.
Place your hand over the sensor -
should read 0 VDC.
TIPPING BUCKET RAIN GAGE
Refer to schematic wiring diagram -
located in the Appendix - FIGURE 31
• The Rain Gage has a reed switch that
closes as the tipping bucket
mechanism “tips”. Connect the
OHM meter across P2 & G (pins #3
& #5) and should read infinite
OHMS. When bucket mechanism is
“tipped” - should then get less than 1
OHM.
• If the bucket tipping mechanism is
working correctly you should read
+5 Volts DC with the meter set at DC
volts and connected across the reed
switch, while sensor is plugged into
the Weather Station. When the bucket
is “tipped” the reed switch closes and
you should have 0VDC. There is
continuous low voltage going through
this reed switch, except as it “tips” at
which time the +5 Volts DC is
shorted, and thus there is a possibility