The ASPTC is a type E thermocouple housed in a white, elongated radiation shield.
The radiation shield reduces solar loading on the thermocouple by drawing air across the measurement junction with a fan. The radiation shield also protects the thermocouple, increasing its durability. Typically, one ASPTC is mounted to each sensor arm in a Bowen ratio system. One ASPTC can either replace, or be measured in addition to, TCBR thermocouples. In a standard configuration, lead lengths of 15 feet are recommended for both signal and power cables.
Uses fine wire thermocouple for highly accurate air temperature measurements
Includes aspirated radiation shield
Solar loading on thermocouple reduced by drawing air across the measurement junction with a high-powered fan