101
Receiver Cavity with inverted cone shaped bottom, coated with specular black paint cavity
(absorptance : >.9998).
Detector Electrically calibrated differential heat flux transducer with resistance thermometers
as sensors
Accuracy Measurement uncertainty (referred to SI-Units) < ± 0.25%
Precision ± 0.01%
Mechanical Dimensions
Diameter 75 mm
Length 200 mm
Weight, approx. 2.2 kg
Field of view
(full angle) 5/
Slope angle 1/
Receiver aperture
diameter (nominal) 5 mm
Control Electronics
Plug-in circuits (electronic prints) inserted in a cabinet with power supply and control
panel
Cabinet width 290 mm
height 70 mm
depth 330 mm
Power Supply 110 V/220 V
50 Hz/60 Hz
10 W
B 3.3 Eppley Normal Incidence Pyrheliometer
The Eppley Normal Incidence Pyrheliometer (NIP), as the name implies, was designed for the measurement
of solar radiation at normal incidence.
The NIP incorporates a wire-wound thermopile at the base of a tube, the aperture of which bears a ratio
to its length of 1 to 10, subtending an angle of 5°43'30". The inside of the brass tube is blackened and
suitably diaphragmed. The tube is filled with dry air at atmospheric pressure and sealed at the viewing
end by an insert carrying a 1 mm thick, Infrasil II window. Two flanges, one at each end of the tube, are
provided with a sighting arrangement for aiming the pyrheliometer directly at the sun. A manually rotatable
wheel which can accommodate three filters, while leaving one aperture free, is provided.
The pyrheliometer is mounted on a power-driven equatorial mount for continuous readings.
A calibration certificate traceable to the World Radiation Reference and a temperature compensation
curve are included.
Specifications
Sensitivity approx. 8 µV W m
-1 2
Impedance approx 200 S
Temperature Dependence ±1% over the ambient temperature range -20° +40° C
(temperature compensation of sensitivity can be supplied over
other ranges at additional charge)
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