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.

Features

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
Intake velocity is 5.5 m/sec
Fan requires 12 Vdc power supply
Fan average active current drain is 142 mA

Specifications

Shield Material: UV stabilized polyethylene
Thermocouple Type: Chromel-Constantan
Thermocouple Typical Output: 60 μV/°C
Air Velocity at Thermocouple: 5.5 m @ 12 Vdc
Fan Life Expectancy: 60,000 hrs @ 25°C
Fan Current Drain: 140 mA @ 25°C
Fan Thermal Fuse: opens @ 640 mA
Fan Operating Voltage Range: 6 to 14 Vdc
Fan Radiation Error: <0.2°C radiation @ 1100 W m-2 irradiance

Producing Area:USA