The ASPTC is a white, elongated radiation shield that reduces solar loading on a thermocouple by drawing air across the measurement junction with a fan. The radiation shield also protects the sensor, 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 4.6m (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

• Weight: 860 g (1.9 lbs); 700g (1.6 lb) without cable
• Length: 53.3 cm (21")
• Height: 14.7 cm (5.8")
• Large diameter: 5.8 cm (2.3")
• Small diameter: 4.6 cm (1.8")
• Power cable diameter: 0.5 cm (0.2")
• Signal cable diameter: 0.3 cm (0.1")

Resources

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