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RS Series Motor Aspirated Shield 

The RS motor aspirated shield was designed in cooperation with MeteoSwiss, the Swiss National Weather Service. This shield essentially eliminates the influence of solar radiation on humidity and temperature measurements. At the same time, the shield offers optimal protection to the probe against wind and horizontally drive precipitation.
The RS shield consists of two shells with a special coating. Air is aspirated from the bottom of the shield and is separated into a primary and a secondary flow (dark and light blue arrows). The probe is placed horizontally in the primary air flow (dark blue). The secondary air flow (light blue) provides additional insulation to the inner shell. The fan has a high aspiration rate so as to increase measurement accuracy and minimize any loss of measurement data in situations where condensation could occur at the probe. Field test data developed by MeteoSwiss show that the combination of the RS shield and ROTRONIC probes provides measurements that are practically identical to the measurements provided by the chilled mirror instruments (DPM) commonly used by most national weather services (see example below). Compared to a chilled mirror instrument, the ROTRONIC shields and probes are less expensive to purchase and to maintain.
	When using a probe with a separate temperature sensor (some models of the MPH series), best accuracy is obtained by installing the probe as shown with the RTD sensor under the probe.