Campbell Scientific ASPTC Aspirated Thermocouple - Manual (Page 5)

Model ASPTC Aspirated Shield
with Fine Wire Thermocouple
1. General
The model ASPTC is an aspirated shield with a chromel-constantan
thermocouple temperature sensor. One ASPTC can be used to measure
absolute air temperature. Two ASPTCs are used to make delta temperature
measurements. The differential voltage thermocouple instruction (TCDiff in
CRBasic or Instruction 14 in Edlog) is recommended to measure the ASPTC,
because a differential measurement reduces noise.
1.1 Specifications
Weight: 1.9 lbs (0.86 kg)
Shield
Material:
UV stabilized polyethylene
Dimensions
Length:
21 inch (53.3 cm )
Height: 5.8 inch (14.7 cm)
Large Outer Diameter: 2.3 inch (5.8 cm)
Small Outer Diameter: 1.8 inch (4.6 cm)
Fan
Air Velocity at
Thermocouple:
5.5 m/s @ 12 Vdc
Life Expectancy: 65,000 hrs @ 30°C
Current Drain: 260 mA @ 12 Vdc
Operating Voltage: 9 to 13 Vdc
Operating Temperature: -10° to 70°C
Reverse Polarity Protected
Thermocouple
Type: Chromel-Constantan
Diameter: 0.003 inch (0.0762 mm)
Typical Output: 60 μV/°C
Accuracy: Refer to the “Thermocouple Measurement”
section in your datalogger manual.
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