Kipp&Zonen BSRN Scientific Solar Monitoring System - Manual (Page 119)

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A specially coated silicon dom e transm its incom ing radiation with wavelength of m ore than 3 m icron, by
cutting off shorter wavelengths. The output of the therm opile sensor is added autom atically to the output
of a built-in tem perature com pensation circuit that incorporates a therm istor to produce the correct electrical
signal corresponding to the incident infrared radiation.
Specifications
Spectral Range 3 to 50 :m
Accuracy ± 5 %
Power supply 3 Volt lithium battery
Battery life: 300 days
Tem perature Measurem ent Therm istor or PT-100
B 4.3 Kipp and Zonen Delft CG4 Pyrgeom eter
The CG4 has been designed for m eteorologival m easurem ents of downward atm ospheric infrared radiation
with high reliability and accuracy. The instrum ent uses a specially designed silicon window, that although
not hem ispherical, provides a 180° field of view with good cosine response. A diam ond-like surface protects
the outer surface of the window, while the inner surface filters all solar radiation. The design of the instrum ent
is such that solar radiation absorbed by the window is conducted away to reduce the solar heating effect.
This reduces the need for dom e heating correction term s and shading from the sun.
Specifications
Spectral Range 4.5 to 42 :m
Sensitivity 10 :V W m (nom inal) -1 2
Im pedence 40 - 200 S (nom inal)
Response Tim e 25 s (95%)
< 8 s (63%)
Non-linearity <± 1% (-250 to + 250 W m ) -2
Tem perature Dependence Max. ± 1% (-20 to + 50 °C)
Tilt Error Max. 1% when facing downwards
Operating Tem perature -40 to +80 °C
Field of View 180°
Non-stability <± 1% sensitivity change per year
Tem perature Measurem ent Therm istor YSI 44031 or
Pt-100 Heraeus M-GX 1013
Receiver Paint carbon black
W indow silicon with solar blind filter and diam ond-like coating
W eight 1050 g
Dim ensions W x H 150 x 76 m m