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Pyrgeometer PIR
The Precision Infrared Radiometer (PIR) pyrgeometer is intended
for unidirectional operation in the measurement, separately, of
incoming or outgoing terrestrial radiation as distinct form net
long-wave flux. The PIR includes a circular multi-junction wire-wound
Eppley thermopile which has the ability to withstand severe mechanical
vibration and shock.
Isolation of long-wave radiation from solar short-wave radiation
in daytime is accomplished by using a silicone dome. The inner surface
of this hemisphere has a vacuum-deposited interference filter with
a transmission range of approximately 3.5 to 50 µm.
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Specifications
| Sensitivity |
approx. 4 µV/Wm-2 |
| Impedance |
approx. 700 Ohms |
| Temperature Dependence |
±1% over ambient temperature range -20 to +40°C |
| Linearity |
±1% from 0 to 700 Wm-2 |
| Response time |
2 seconds (1/e signal) |
| Cosine |
better than 5% |
| Mechanical Vibration |
tested up to 20 g's without damage |
| Calibration |
blackbody reference |
| Size |
5.75 inch diameter, 3.5 inches high |
| Weight |
7 pounds |
| Orientation |
Performance is not affected by orientation or tilt |
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