CDA PC44 Instruções de Operação descarregar pdf (Página 19)

Figure

7 - Retroreflect

e sensor

A - Emitter/Rece

-Substrate

C - Retroreflector

()

Nordson Corporaoon 1993

AI Righls Reserved

Equipment Familiarization 2-7

Retroreflectlve

Sensors

This sensor consists

a single unit

that

contains the LED light source

(emitter) and the light-sensing phototransistor (receiver). The

emitter/receiver bounces its light off an opposing retroreflector

reflective tape and "sees" the reflected light.

The

light beam is broken

the substrate passes between the sensor unit and the reflector

(Figure 2.7).

• Retroreflective Polarizing Model - This

ant

i-glare unit polarizes the

emitted light and filters out unwanted reflections.

It has an

effective range

2 in. (5.1 em) to

7ft

(2.1 m).

• Retroreflective Model - This is a non-polarized sensor that is

effective

to a range

15ft

(4.5 m).

PIN 108

389A

-28 1/93

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CDA PC44 Instruções de Operação Página 19