Benefits and Features
Uses 1000 Ω RTD for highly accurate air temperature measurements
Well-suited for air quality applications
43502 fan-aspirated radiation shield reduces radiation errors for more accurate measurements
Ideal for delta temperature measurements used in calculating atmospheric stability class
Standard RTD uncertainty is ±0.3ºC. With optional three point calibration, uncertainty is only ±0.1ºC.

Technical Description
Delta Temperature Measurements
To determine delta temperature, a 43347 probe mounted in a 43502 shield is attached to the mast of a UT930 tower, while another 43347 probe mounted in a 43502 shield is attached to the tower at a 2-m height. The temperature difference of the two measurement heights is calculated and used to determine atmospheric stability as required by the EPA.
43502 Aspirated Radiation Shield
The 43502 employs concentric downward facing intake tubes and a small canopy shade to isolate the temperature probe from direct and indirect radiation. The 43347 probe mounts vertically in the centre of the intake tubes. A brushless 12 Vdc blower motor pulls ambient air into the shield and across the probe to reduce radiation errors. This allows temperature to be measured with an RMS errror of less than ±0.2ºC. The blower operates off a 230 V to 12 Vdc transformer that is included with the shield.