dallee-electronics opto-dt User Manual

OPTO-DT

[] DT1 #552

[] DT3 #553

OPTO-DT

INFRA-RED OPTICAL DETECTION

The OPTO-DT is a detection device in which the output relay (Double Pole Double Throw) is activated when the

optical path of an infra-red beam is interrupted. An additional version allows up to three separate infra-red beams
activating the same relay.

The electronic circuitry must be powered by a regulated 12 volt DC supply (see our 12VPS, item 369) in order to

function properly, failure to do this will destroy the electronics.

The infra-red beam is generated by an input set (optical coupler) consisting of an emitter (looks like a black LED) and

a detector (looks like a clear LED). The emitter and detector are mounted on the layout so as to establish a line of
sight beam across an area where detection is desired. The emitter and detector can be separated by more than
6  feet  but  must  be  precisely  aligned.  To  assist  in  this  alignment,  there  is  an  LED  on  the  OPTO-DT  which
illuminates  when  proper  adjustment  is  achieved.  The  version  with  multiple  inputs  has  switches  so  that  each
emitter/detector set can be independently aligned. If a hood or shield is placed on the detector the range of the
infra-red  beam can be extended substantially. The actual distance  will depend on conditions  within your layout
area and on how precisely you are able to align the emitter/detector set.

The OPTO-DT can be set for two distinct time functions. In

NORMAL function, with the time adjustment at minimum

setting, the relay will be activated (on) when the infra-red beam is interrupted and relaxed (off) when the beam is
restored. As the time adjustment is increased a minimum (on) time for the relay is established. When the beam is
broken the relay is (on) for at least the minimum time period. If the beam remains interrupted beyond the minimum
time period the relay stays (on) until the beam is restored. In

TIMER function, when the beam is broken, the relay

is (on) for the duration of the time adjustment, then relaxes (off). The relay will not again activate until after the
beam is restored which will allow the circuit to reset. This time adjustment is variable from momentary to about
60 seconds.

Each OPTO-DT is furnished with one input set (optical coupler). Additional sets are available for use with the multiple

version which can handle up to three input sets.

Lower Right -

Optical detector inputs

GREEN LED -

Alignment Indicator

Upper Right -

Optical emitter inputs

Upper Left -

Relay Output &

'+' input power

Lower Left -

Relay Output &

'-' input power

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ack

con

nec

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tin

Mounting

#6 screw

Selector Switches - DT3

Jumper block - DT1

1|2

1 | 2 | 3 | 4

sec

t. B

Relay sect A: 1 - N/O

B: 4 - N/O

2 - C

3 - C

3 - N/C

2 - N/C

Time

Adjust

sect. A

246 W. Main St.

Leola, PA 17540

(717) 661-7041