Introduction, Models, Weather and radiation shields rs12t / rs24t – ROTRONIC RS24T User Manual
Page 8
E(D/F)-M-RS12/24T-V1_00
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
Ventilierter Wetterschutz
Ventilated weather and radiation
shield
Instruction Manual
Document Type
Page 8 of 17
Document title
1. Introduction
The ventilated weather and radiation shields RS12T with 12 VDC fans and RS24T with 24 VDC
fans were developed in close cooperation with MeteoSwiss, the Swiss National Meteorological
Organisation. The instruments reduce the influence of thermal radiation on the measurements of
temperature and humidity to a minimum and represent state-of-the art technology. The shield also
offers optimum protection in stormy weather, even against horizontally driven rain and snow. The
values measured by the combination of the weather shields and a ROTRONIC meteorological
probe are practically identical to the ones measured by much more expensive dew point mirrors
used as reference instruments by many meteorological organisations. The fan is supplied by a
separate cable. Compared to former products, the new shield offers a remarkably increased
accuracy of measurement. All ROTRONIC Meteorology-probes may be used with the new shield.
2. Models
Apart from the different fan and its supply voltage, RS12T and RS24T are absolutely identical.
The shields offer protection against precipitation and radiation. This means that the temperature-
and humidity values are almost 100% identical with the effective conditions. This is achieved by a
divided flow of air: the main stream intersects the probe rectangular, which means an optimal
incoming flow. The shield features two shells, which are mounted one over the other. The air
between these shells is constantly exchanged, and hence the temperature inside the measuring
tube is equal to the prevailing conditions.
The shield and mounting arms are two separate units. While the shield ist he same for all probes,
(except fan and voltage), the mounting arms allow the use of all different ROTRONIC meteorology-
probes.
3. Weather and Radiation Shields RS12T / RS24T