Use a multimeter to measure the resistance, 200 ohms is enough. The red and black test leads of the multimeter touch the two electrodes of the electric heating rod respectively. Generally, the resistance of a 1.5 kW electric heating rod is about 32. ohms, and the resistance of a 2 kW electric heating rod is about 24 ohms, the resistance of the electric heating rod of 3 kW is approximately 16 ohms. If it exceeds the range too much, the electric heating rod is defective.
Is the reflector used for butterfly solar a plane mirror or a parabolic mirror?
Replace the lens with a new one. If the auto-darkening solar lens does not darken, it indicates that it has aged and needs to be replaced with a new lens. Auto-darkening solar lenses are lenses that incorporate photochromic materials that change color when excitedby a light source. Photochromic materials will gradually age and lose their color changing properties with the number and time of color changes. Cheap or low quality products only have a 1 year warranty.
Parabolic solar reflectors are rotating parabolic reflectors, which are assembled according to the size of the dish;
Currently, many small parabolas are formed by gluing small pieces of flat mirrors;
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Larger dishes are also made of hot-bent rotating parabolic glass;
Larger dishes are made of cold-bent flat glass mirrors in a rotating parabolic glass, but these glass mirrors are relatively thin. and attached to other materials.