Campbell Met One 034A-L Manuel de l'opérateur télécharger pdf (Page 23)

Manual

Sensors

3.1 Tipping Bucket Rain Gauge

3.1.1 General

The Met Station includes a TE525 tipping bucket rain gauge made by Texas Electronics, USA. It is a smaller adapta-

tion of the standard US Weather Bureau tipping bucket rain gauge. The instrument is equipped with two buckets,

with a known volume, connected to each other by a horizontal axis balanced on a fulcrum. Rain is collected with a

conventional funnel of standard diameter and directed to one of the buckets. Once this bucket is full, it becomes

unstable and tips, herewith emptying the full bucket and bringing the other bucket into filling position. Each tip gen-

erates an electric pulse, which is recorded by the data logger. A pulse represents 0.1 mm of rainfall, and the total

rain volume is thus obtained by summing the pulses and subsequent multiplying with 0.1. The user can measure

the temporal distribution of a rainfall event by defining short time intervals in which the pulses are aggregated and

recorded.

For detailed technical specifications of the TE525 Tipping Bucket Rain Gauge, the reader is referred to the cor-

responding Campbell Scientific’ Instruction Manual.

Figure 7 shows the TE525.

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Figure 7: Tipping Bucket Rain Gauge TE525

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Campbell Met One 034A-L Manuel de l'opérateur Page 23