Operating instructions
2-6 Equipment Familiarization
4.
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
of
an
Emitter and a Receiver
• (1) Diffuse Reflective (Proximity) Sensor
•
(2)
Retroreflective Sensors
Opposed Mode (Through Beam) Sensor
This sensor consists
of
two units:
an
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
ed
mode (through beam) sensor
A - Emitt
er
B - Sub
st
rate
C-Receiv
er
Figure 2.6
- Diffuse reflect
iv
e (pro
xi
mity) sensor
A - Emitter/Receiver
8-
Substrate
PIN 108
389A
57·28 1/93
Diffuse Reflective (Proximity) Sensor
This sensor (Figure 2.6) consists
of
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
up
to
a range of 15 in. (38.1
em).
C
No
rdson CorporatiOn
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oghts
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ed