UM-780-303-ARG314 Manual
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V1.1
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Wiring for internal loggers
To connect an internal data logger or counter, two wires have to be connected to the green connector
terminal block and taken to the contact closure input of your chosen logging device.
The ARG314 includes a 2-way terminal for connection (the green terminal). As this is a contact closure
(switch) device it does not matter which way you connect this to your logging device or counter.
5.
Operation
Operation of the gauge
Rainfall is measured by the well-proven tipping bucket method. Precipitation is collected by the funnel
and flows through a stainless-steel gauze filter, trapping and removing any leaves, dirt, etc. Figure 5.
Water then drips from the nozzle into one of the two halves of the tipping bucket.
The internal tipping bucket assembly rotates around precision rolling pivot bearings. The balance arm
tips when the first bucket is full, emptying this rain water and positioning the second bucket under
the funnel. The tipping process repeats indefinitely as long as the rain continues to fall, with each tip
corresponding to a calibrated fixed quantity of rainfall. At each tip of the bucket the moving arm
forces the magnet past the reed switch causing contact to be made for a few milliseconds. As each
bucket side is used in turn, the outgoing water is drained away via outlets and discarded. Figure 6
shows the internal mechanism of the ARG314.
Figure 5 - Filter and filter cap (left) / Nozzle delivering water into tipping bucket (right)
