The Photohead photoelectrically detects the web edge.
As a pulsed infrared light emitting diode (LED) is used as the light source, the Photohead can be applied for a web such as photosensitive paper, which is adversely affected by light.
The Photohead PH21 photoelectrically detects the web edge.
This sensor is a miniaturized model of PH16B, but with the same functions.
|Range of measurement
|Light source wavelength
||950nm (near infrared)
||Power supplied from the Web Guide amplifier: 12 V DC
||Voltage in proportion to the change in light intensity at the silicon light detection element: 300 mV±20％ when the path is open
||Voltage in proportion to the change in light intensity at the silicon light detection element: 350 mV±20％ when the path is open
||0.1 mm of displacement of opaque web
||Aluminum alloy die casting
||0℃ to +50℃
||1kg (including cable)
||0.4kg (including cable)