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Web Control Systems
Edge Position Control Systems(Sensors)
PHOTOHEAD PH16B / PH21
Overview |  Specifications |    

PHOTOHEAD  PH16B / PH21

Overview

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.

PH16BPH21
Sensor gap 28mm 10mm
Range of measurement ±4mm
Light source LED
Light source wavelength 950nm (near infrared)
power supply Power supplied from the Web Guide amplifier: 12 V DC
Output 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
Sensitivity 0.1 mm of displacement of opaque web
Body material Aluminum alloy die casting Conductive plastic
Ambient temperature 0℃ to +50℃
Weight 1kg (including cable) 0.4kg (including cable)