Explanation of the criteria for classification and numbering of components      C30.3.06
 (JUN 00)
Explanation of the dates on the component's description


1.   Purpose and objectives

     To measure the amount and the intensity of rainfall and snowfall.

2.   Description

     This gauge is an intermittently measuring tipping bucket-type rainfall sensor with a heated water tank. Snowflakes are trapped in the heated tank initially and melted. The water drains to a tipping-bucket for measurement.

     To trap snowflakes correctly, a specially designed wind guard is attached. The gauge diameter is 200mm and bucket capacity can be 0.5mm or 1.0mm.

3.   Input

     Actual rainfall and snowfall.

4.   Output

     Contact pulse signal.

5.   Operational requirements and restrictions

     For the installation site of the instrument, a location should be selected where there are no surrounding obstacles such as large trees, buildings, and ground surface is flat.

6.   Form of presentation

     A catalogue and instrument specifications are available.

7.   Operational experience

     About 100 sets were installed in Japan in 1999.

8.   Originator and technical support

     Yokogawa Denshikiki Co.,Ltd.

9.   Availability

     From the HOMS National Reference Centre for Japan.

10.  Conditions on use

     Hardware is for sale.


(First entered: 01 FEB 93

Last updated: 21 APR 00)