ASPTC-L Aspirated Thermocouple with Mounts Fine-wire thermocouple in aspirated radiation shield delta temperature measurements. Often, the ASPTC replaces, or is measured in addition to, the TCBR thermocouples in a Bowen ratio system. 1 Includes aspirated radiation shield 1 High-powered fan reduces solar loading The ASPTC-L consists of a type-E fine-wire thermocouple mounted in a fan-aspirated radiation shield to provide highly accurate air temperature measurements. One ASPTC can measure absolute air temperature, or two ASPTCs can make J Uses fine-wire thermocouple for accurate air temperature measurements The ASPTC's radiation shield is an elongated tube constructed from white UV-stabilized polyethylene that provides low thermal conductivity and heat retention. A fan draws air across the measurement junction, which reduces solar loading on the thermocouple. The radiation shield also protects the thermocouple, increasing the thermocouple's durability. The ASPTC's fine-wire thermocouple consists of a chromel wire and a constantan wire joined at a measurement junction. A voltage potential is generated when the measurement end of the thermocouple is at a different temperature than the reference end of the thermocouple. The magnitude of the voltage potential is related to the temperature difference. Therefore, temperature can be determined by measuring the differences in potential created at the junction of the two wires. A reference temperature measurement is required for thermocouple measurements. The temperature sensor built into many of our dataloggers' wiring panel typically provides this measurement. Signal Cable Diameter 0.3 cm (0.1 in.) Shield Material UV-stabilized polyethylene Power Cable Diameter 0.5 cm (0.2 in.) For comprehensive details, visit: www.campbellsci.eu/asptc

Polarity Protection Reverse polarity protected Type Chromel-Constantan Typical Output 60 pV/°C Accuracy Refer to the Thermocouple Measurement section in the data logger manual. For comprehensive details, visit: www.campbellsci.eu/asptc 80 Hathern Road, Shepshed, LEI 2 9GX UK | +(0)1509 828888 | [email protected] | www.campbellsci.eu AUSTRALIA | BRAZIL | CANADA | CHINA | COSTA RICA | FRANCE | GERMANY | INDIA | SOUTH AFRICA | SPAIN | THAILAND | UK | USA