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Dallee Electronics Optical Detector
This product has been discontinued and is no longer available for purchase.


Infra-Red Optical Detection

Item #552/553)

Optical detection without interference from ambient light is possible with our OPTODT. Use our single input OPTODT1 to sense any given area using line of sight for 6 feet or more (align diagonally to the track) or use our OPTODT3 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 TRAKDTT (Item #565) all included in one unit. The OPTODT detection is for those requiring line of sight without current detection as our TRAKDT 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 OPTODT3 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. 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 use a "regulated" supply can destroy the electronics.

item #552 INSTRUCTIONS (PDF, 55K)

item #553 INSTRUCTIONS (PDF, 55K)

For advanced uses and applications refer to the information provided at: USE & ADVANCED APPLICATION SUGGESTIONS. Also be aware that the OPTO-DT's can be substituted for the TRAK-DT's and Trak-DTT's in the suggestions provided there.

Relay Contacts - electrical diagram

Relay contacts are used on most all of our Signaling Components. These are used since they are the most forgiving when mis-wiring occurs and they provide for electrical isolation of the load to the circuit.
When the relay is relaxed the "C" Common terminal is connected to the "N/C" Normally Closed. When the relay is activated the "C" Common terminal is then connected to the "N/O" Normally Open terminal. The relays used on our circuitry contain Double contact sets indicated by section A and section B.  Remember ­ a relay is nothing more than an electrically activated switch!



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