Kippzonen CHP 1 Pyrheliometer Manuel d'utilisateur télécharger pdf (Page 12)

5.6 Field of view

Figure 4 shows the pyrheliometers optical construction.

Figure 4: Optical construction

The beam of light that reaches the detector is limited by the field and aperture stop. The slope, opening and limit

angles are determined by R, r and L. The distance x is negligible.

For the CHP 1 the full opening angle is 5 °, the slope angle is 1 °. The sun, as seen from the detector, occupies a

solid angle of 0.5 °. A 100 % response can be expected only if the sun is entirely within the slope angle. This is the

case when tracking accuracy is better than slope angle minus half the solar angle.

Concluding, tracking accuracy should be within 0.75 ° of ideal.

5.7 Environmental

The CHP 1 pyrheliometer is designed for outdoor use under all expected weather conditions. The radiometers

comply with IP 67 and their solid mechanical construction is suitable to be used under all environmental conditions

within the specified ranges.

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Kippzonen CHP 1 Pyrheliometer Manuel d'utilisateur Page 12