Specifications

OPTO-DT
Infra-red Optical Detection - optically sensed via broken beam
Optical detection without interference from ambient light is
possible with our OPTO-DT. Use our single input
OPTO-DT1 to sense any given area using line of sight for 6
feet or more (align diagonally to the track) or use our
OPTO-DT3 to obtain detection with one, two, or three input
detector pairs. Both units offer a single block type detection
output, utilizing a 5 ampere double pole double throw relay
and an expansion connector for a second relay (Item
#555), with the timing features offered like our TRAK-DTT
(Item #565) all included in one unit. The OPTO-DT
detection is for those requiring line of sight without current
detection as our TRAK-DT family of detectors.
The OPTO-DT1 (Item 552) 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.
The OPTO-DT3 (Item 553) version allows up to three
separate infra-red beams activating the same relay.
The infra-red beam is generated by an input set consisting of an emitter (looks like a clear LED) and a detector (looks like a
black 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 OPTO-DT3
unit, 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. With careful alignment,
distances of 15 to 20 feet or more are usually obtainable.
The OPTO-DT has two distinct modes. In NORMAL mode, 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 mode, 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 time circuit to reset. This time
adjustment is variable from momentary to about 60 seconds.
Each OPTO-DT is furnished with the appropriate number of optical coupler input sets. It is also necessary to provide power
for the electronics. In order for the electronics to function properly it is essential that a "regulated" power supply of 12 VDC
be employed. Failure to use a "regulated" 12 VDC can cause erratic functioning or actual destruction of the TRAK-DT which
is not covered under warranty. The 12VPS (item 369, pg 35) is ideal for this function.
Item #552, 553
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Emitter mounted on
bracket with wires.
Detector mounted on
bracket with wires.
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OPTO-DT3 (#553)
main board pictured