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Assembly and Operating Instructions for Kits


Operation of the Photo Gate 2i (PG2i)


Assembly instructions for other kits


Photo Gate 28 Photo Gate 28
Control side Sensor side


Powering the unit and checking operation

In order to test for proper operation, insert a fresh battery in the battery holder as shown in Photo 1 below. Turn the switch to On. The LED should light. Now run a finger through the interrupter. The LED should blink. In fact, as long as the interrupter is blocked, the LED will be off.


Connecting and using a flash unit

In order to use the photogate to observe or aid in the photography of high-speed events, connect a flash unit to the RCA jack. You'll need a cable that connects to your flash unit on one end and to the RCA jack on the other. Photo 2 shows one such cable that connects to the PC jack on the flash unit. Kits for these cables are available in the online store.


Once the flash is connected and turned on, blocking the interrupter will discharge the flash immediately. If the event that you want to observe or photograph requires a time delay before the flash discharges, you'll need to connect a cable between the RCA jack and the input of a Delay Timer. See Photo 3.


Caution: The Photo Gate 2i isn't designed to trigger a camera directly. While connecting your camera shutter to the RCA jack isn't likely to damage your camera and may, in fact, trigger some camera makes, we don't recommend it. The output isn't optically-isolated from the circuitry of the trigger. If you want to trigger a camera, connect to a Delay Timer and then connect the camera to the Shutter jack on the Delay Timer.


Adjusting the sensitivity

It typically isn't necessary to change the sensitivity. However, some applications may require greater sensitivity. In that case, insert a jeweler's screwdriver through the hole marked Sensitivity in Photo 4. Turning counterclockwise will increase the sensitivity. When you return the sensitivity to the original position, try to turn it about midway between the maximum and minimum positions. You'll know when you've turned too far clockwise, because the Ready LED will go out and the unit won't operate.


Additional notes on operation

  • When dropping liquid drops through the interrupter, you may wish to seal around the interrupter where it passes through the box in order to keep liquid out of the box. If you use hot glue, you can peel it off later if you need to open the box.
  • The infrared beam across the interrupter is about 1/8 inch from the ends of the posts. Keep this in mind when aligning the interrupter with the beam-breaking event.

Photo 1 Photo 2 Photo 3 Photo 13d




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