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4.1 MOISTURE IN CANISTER
The hex bolts used to seal the top and bottom
of the canister should be tightened every spring
and fall to maintain seal integrity. As a
guideline, the bolts should be tightened to about
160 inch pounds.
The readings from a moisture detection sensor
housed in the canister are displayed in Location
3 and accessed by keying *63A (Section 2.7).
The sensor detects humidity above 33% with 0
dry and readings in the 100s being wet. The
readings should be monitored regularly and if
they are above 200, the weather station must
be dried out.
WARNING: Damage to the CR10, modem,
and wiring panel will occur if high moisture
levels are not corrected. The weather
station should be dried out and the
desiccant reactivated when the moisture
reading is 200 or greater.
When opening the canister, loosen each hex
bolt one half turn until each bolt has been
loosened two full turns.
CAUTION: DO NOT REMOVE THE
BOLTS FROM THE CANISTER.
Desiccant can be reactivated by placing it
in an oven at 250 oF for 16 hours.
4.2 RAIN GAGE
Inspect and clean the rain gage as needed to
remove leaves, debris, etc. The rain gage
calibration is 0.01 in. per tip. The following
check is advised every 6 to 12 months.
Rain Gage Calibration:
1. Secure a metal can that will hold at least
one quart of water.
2. Punch a very, very small hole in the bottom
of the can.
3. Place the can in the top funnel of the rain
gage and pour 16 fluid ounces (1 pint) of
water into the can (A 16oz. soft drink bottle
SECTION 4. MAINTENANCE
4.3 SOLAR RADIATION
4.4 WIND SPEED AND DIRECTION
filled to within 2.5 inches of the top may be
used for a rough field calibration).
4. If it takes less than 45 minutes for this
water to run out, the hole in the can is too
large.
5. One hundred tips plus or minus three tips
should occur.
6. Adjusting screws are located on the bottom
adjacent to the large center drain hole.
Adjust both screws the same number of
turns. Rotation clockwise increases the
number of tips per 16 oz. of water; counter
clockwise rotation decreases the number of
tips per 16 oz. of water. One half turn of
both screws causes a 2% to 3% change.
7. Check and re-level the rain gage lid.
Inspect and clean the pyranometer every two to
three months. Dusty environments may require
more frequent cleaning. Be careful not to
scratch the surface of the sensor. A blast of
clean, dry air or a soft bristle, camel hair brush
are best used for cleaning the diffuser surface.
Recalibration of the radiation sensor is
recommended every two (2) years.
Inspect the operation of the anemometer and
windvane bearings at least once a year. They
should move freely and react to a windspeed of
2-3 mph. Check the windvane by manually
positioning it and verifying the reading.
Components requiring replacement due to
normal wear are the precision ball bearings and
the azimuth potentiometer. The bearings have
a life expectancy of twenty million revolutions (3
to 5 years in normal use). This time may be
reduced to 1 year or less in high wind areas.
The anemometer bearings should be replaced if
they become noisy or if the starting threshold
increases above an acceptable level.
CAUTION: DO NOT use WD-40 or other
lubricants on the bearings.
4-1
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