West Castle Alpine Monitoring System
Geonor Precipitation Gauge
The T-200 precipitation gauge was developed more that 25 years ago for all weather precipitation moni - toring. It was designed in cooperation with the Norwegian Meteorological Institute and the Norwegian Geotechnical Institute. Precipitation can be reported at real-time intensity to any interval required.The precipitation gauge is simple to configure for use with automatic data acquisition units. The standard T-200B has a 600 mm capacity and one vibrating wire sensor. 1000mm capacity and three sensors are options. The gauge has a protective housing with a WMO standard 200 cm2 inlet. Inside there is a container for collecting the precipitation.The amount of precipitation is measured by using vibrating wire load sensors. The instrument as well as a wind shield is mounted to the pedestal. With the use of antifreeze any solid precipitation is melted in the container. No electrical heating is therefore required, thus eliminating a common source of error. A thin layer of oil is added to impede any evaporation. The precipitation collected in the container are weighed with a vibrating wire load sensor, which gives a frequency output.The frequency will be a function of the applied tension on the wire, i.e. from this, the amount of precipitation can be computed. The frequency is recorded as a square-shaped 0-5 V signal.This signal can easily be transmitted and interfaced to most data acquisition systems.There are no mechanical moving parts, eliminating other possible sources of error. Using a 3 sensor system ensures the continuation of data recording if one of the sensors should fail.This is made possible with a level retaining device. It also ensures that the total amount of the precipitation will be measured even if there is a slight deviation from the horizontal plane.