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2-6 Equipment Familiarization

Nordson Photoelectric

Sensors

There are four photoelectric sensors that are available from Nordson

for

use as trigger devices with the PC40:

•

(1) Opposed Mode (Through Beam) Sensor, which consists

Emitter and a Receiver

• (1) Diffuse Reflective (Proximity) Sensor

•

(2)

Retroreflective Sensors

Opposed Mode (Through Beam) Sensor

This sensor consists

two units:

LED light source {emitter)

mounted· opposite a light-sensing phototransistor (receiver). The light

beam is broken as the substrate passes between the emitter and the

receiver (Figure 2.5). This sensor is effective up to a range of

10ft

(3m).

Figure 2.5 - Oppos

mode (through beam) sensor

A - Emitt

B - Sub

rate

C-Receiv

Figure 2.6

- Diffuse reflect

e (pro

mity) sensor

A - Emitter/Receiver

Substrate

PIN 108

389A

57·28 1/93

Diffuse Reflective (Proximity) Sensor

This sensor (Figure 2.6) consists

a single unit that contains both the

LED light source (emitter) and the light-sensing phototransistor

{receiver). The diffuse mode sensor detects its own emitted light

reflected off the substrate. The light beam is broken when there is no

substrate opposite the sensor (no reflecting surface). This sensor is

effective

a range of 15 in. (38.1

em).

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