Radiation shields

Metspec Radiation Shields have an innovative design to reduce overheating when solar radiation is high and wind speed is low. This is also effective in the winter when the sun’s angle is low or there is reflection off snow.

The design of the shield has a white outer reflective surface combined with an inner barrier of non-reflective, black louvres. This prevents sunlight and reflected radiation reaching the sensor whilst still allowing air to flow across the sensor. This design is based on the Metspec Stevenson Screen which is now established as an industry standard and sold to National Meteorological Services worldwide.

Trials carried out over the past year have confirmed that errors under adverse conditions are typically half those compared to similar shields.

Key Features
• Accuracy in trials comparable to Stevenson Screens
• Less sensitive to rainfall events
• Improved protection against wind blown precipitation due to larger interior size
• Secure sensor installation with stable mounting mechanism
• Tough and durable UV stable plastic
• No power required

Accuracy

Typical solar heating errors: In conditions of high solar radiation and wind speeds less than 1 m/s the readings were compared with an aspirated shield.
RAD 01 Small version: +0.75°C
RAD 02 Large version: +0.5°C

Specifications

•Double louvred high impact polycarbonate
•White external layer, with UV stabiliser for long-term weather resistance
•Extra black internal layer
•Aluminium arm with durable white powder coating
•A4 grade (316), stainless steel ‘U’ bolt, and securing nuts to fit a pole of between 25-51mm diameter
•Black acetal plastic locating clamp

Probe Compatibility

RAD 01:Houses shorter probes with up to 120mm inside the shield. Standard diameter range 5-12mm.
RAD 02:For all longer probes. Standard diameter range 14-25mm.
Optional: smaller or larger tightening glands can be fitted on both models if required.

Customization

The number of plates can be increased or decreased to allow for longer or shorter sensors. The shields are available with alternative mounting arms, for example top down mounting. Please ask for more information.

RAD 01:
Overall 165mm diameter x 172mm height
(Shield only); 303 mm including bracket. Weight 1.05kg.

RAD 02:
Overall 165mm diameter x 274mm height
(Shield only); 405mm including bracket. Weight 1.34kg