103
Full opening angle 5° ± 0.2°
Slope Angle 1° ± 0.2°
Sight accuracy +0.2° from optical axis
Materials Anodised aluminum case, stainless steel screws
Window material Infrasil 1-301
Weight 700 grams
Desiccant Silica gel
Cable length 10 m (Standard)
Absorber coating Kipp & Zonen carbon black
B 3.5 Eko MS-53A Pyrheliometer
This pyrheliometer measures the intensity of a radiant beam at normal incidence that comes only from
the solar disk which includes about 5 degrees of circumsolar radiation. The sensor of this instrument,
designed in conformity with WMO specifications, is mounted on a tracking system to be always directed
to the sun. The tracking system incorporated a sun sensor for tracking during clear weather, and changes
automatically to a mechanical mode during cloudy weather.
Specifications
Sensitivity about 4 mV/kW m
-2
Aperture angle 2.5 degree (half angle)
Tracking System
Mechanism 2-axis pulse motor
Angular step less than 0.01 degree
Tracking process automatic commutation between sun sensor mode and
mechanical mode
B 3.6 Carter-Scott Middleton DN5 & DN5-E Pyrheliometer
The Middleton DN5 is an affordable precision pyrheliometer for measuring the solar direct radiation when
aimed at the sun. It exceeds the ISO9060 specifications for a First Class pyrheliometer. The DN5 has
a passive microvolt output, and the DN5-E version has an in-built signal amplifier to give a millivolt output
for easy measurement.
Twin-thermopile sensor accommodates rapid temperature changes
Broad bandwidth (0.2 to 5 :m), and flat spectral response
Flush-mount window to prevent obstruction by rain or debris
Fully sealed construction with internal desiccant
DN5-E has low-noise signal amplifier with negligible drift
Condition of desiccant is easy to inspect visually
Thermistor output provided for sensor temperature
Aiming diopter conveniently located on top of instrument
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