21
Tips
• There should be nearly an equal number of water drops between cup tips. If
not, then adjust the calibration screws beneath the tipping lever until
an equal number of water drops are tipping the cups. Then, restart the
calibration procedure.
• If you don’t hear the cups tipping and see water dripping alternately out of
each drain, there may be an issue with the rain gauge or it’s adjustment.
Adjustment
If the rain gauge doesn’t register close to 1.68”
(42.67 mm)
after the cup is empty, make an EQUAL
adjustment to the two calibration screws, located
beneath the tipping cups. Turn screws counter-
clockwise to increase rainfall; turn screw clockwise to
decrease rainfall.
• To adjust the rainfall reading by 2%
turn both screws 1/4 of a turn.
• To adjust the rainfall reading by 4%
turn both screws 1/2 of a turn.
• To adjust the rainfall reading by 8%
turn both screws 1 full turn.
2 CALIBRATION SCREWS
COLLECTING CUP
Increase
Rainfall
Decrease
Rainfall
Increase
Rainfall
Decrease
Rainfall
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