Campbell CS705, Instruction Manual

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CS705 Snowfall Adapter
13
7. Reposition the two black bands to cover the joints between the catch tube
and the antifreeze reservoir and between the reservoir and the rain gage
funnel.
8. Fasten the catch tube of the CS705 to the mounting pole using the band
clamps and storage mount (see FIGURE 6-8 ).
9. Place the pail below the rain gage.
6.5 Datalogger Programming
Refer to the manual supplied with the TE525WS Texas Electronics Rain Gage.
The manual is also available at www.campbellsci.com .
7. Maintenance
The CS705 requires regular site visits. The number of required visits mainly
depends on snowfall. Frequent or heavy snows require more site visits.
During site visits, verify the slot in the top of the overflow tube is free from ice
or debris and remove any debris from the catch orifice. If the slot in the
overflow tube becomes plugged, the overflow tube may create a siphon and
draw down the antifreeze level.
The PGE solution gets diluted as precipitation is captured and mixed. Initially,
the CS705 is charged with a pure antifreeze mixture giving it a 1:0 antifreeze to
water ratio. The ratio increases to 1:1 with the equivalent of six inches of
liquid, 1:2 with eight inches, and 1:3 with nine inches. The 1:1 solution
becomes slushy at a temperature of ≈ –35°C, the 1:2 solution becomes slushy at
≈ –20°C, and the 1:3 solution at ≈ –10°C (McGurk, 1992). Ratios greater than
1:3 are not recommended. Refer to FIGURE 7-1 to determine the amount of
remaining antifreeze based on precipitation (water equivalent) recorded.
FIGURE 7-1. Mix ratio versus precipitation received
0.000
0.500
1.000
1.500
2.000
2.500
3.000
3.500
4.000
4.500
0 1 2 3 4 5 6 7 8 9 10
Water Equivalent Received (inches)
M
ix R
at
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W
at
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to A
nt
ifr
eez
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