Flame detector photocells and phototubes, photosensitive resistors
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Who knows the differences between photocells, phototubes, and photosensitive resistors in flame detectors, as well as their advantages and disadvantages? Thank you everyone
The battery outputs voltage, which may be in millivolts; the photosensitive resistor outputs resistance, as can be understood from its name
The sensitivity of a photosensitive resistor is related to the semiconductor material as well as the wavelength of the incident light, and it is greatly affected by temperature； The photovoltaic cell has a steep characteristic curve, and its output behavior is similar to that of a switch; it can be made sensitive to specific wavelengths ； Phototubes can amplify faint light, produce a continuous output, and allow for spectral selection; however, they have complex circuits and are expensive.