The Casella Rainfall Logging System utilizes the Tipping Bucket Rain Gauge with an in-built data logger. The system enables rainfall data to be recorded and stored in the memory as real-time information.

Once measured, the rain water is automatically discharged from the rain gauge and therefore does not overflow when left for long periods of time. The rainfall data is transferred from the logger using a PSION II©, PC or laptop. PC software and a communication lead are provided with each system, enabling the user to produce daily and monthly tables and histograms.

An internal alkaline battery, having a typical life expectancy of up to 3 years, is used to power the system. A lithium battery provides protection of the logged data in the event of main battery failure or replacement. The data logger is only active during actual rainfall and remains dormant during dry spells to conserve both memory and main battery reserves. During rainfall periods, data will be recorded with a time resolution of one minute and presented as total rainfall occurring within the given minute.

For example if the logger of a 0.2mm model logs 3 tips in a 1 minute, it will show a result of 0.6mm rainfall for that minute. The memory has the capacity for almost 100 hours of continuous rainfall.