Seco-Larm E-931-S35RRQ Enforcer Indoor/Outdoor Wall Mounted Photoelectric Beam Sensor with 35 Foot Range

Tested it indoors at up to 16m and it was working reliably, I ran out of more distance to test. But in the end I installed it for my swinging gate outdoors which is only about 6m and it was a breeze. Saved me from the hassle of replacing the old sensor’s batteries every few weeks. I have to say the reflector is pretty small (about the size of 3 fingers) so aiming is challenging but not too hard. Power the sensor, hold the reflector in your hand right in front of it, then slowly move to the other side while making the necessary adjustments and it should be fairly easy and quick.

Very easy to setup. Install the transmitter, move the reflector around until the yellow light comes on. At a distance of 20 feet, the beam spread is about 1 square foot. Locate the reflector in the center. The reflectors can be tilted up to 45 degrees from the beam, but as long as they are in the center of the beam, they work. I installed 4 of these around my house and wired them in parallel. All 4 easily run off of an old laptop power supply. All 4 switched outputs are in parallel and run a 120db siren from the same power supply. I connected an off delay timer from Grainger to keep the siren going for a couple of minutes after the beam is tripped. These units work in daylight or darkness and do not falsely trigger. They are a great alternative to motion sensors which go off only at night and will trip at moving leaves and cats. I installed these at 4 feet high so animals will not trigger them.

Works perfectly for a distance of 22 feet - I didn’t try higher as that’s all I needed for my driveway. Smart techniques used in building this product. It has features to be used in variety of scenarios. It signals for any block immediately and you could use that signal for any purpose necessary. Mine was to secure people from my motorized gates - I wanted gates to stop from moving if any obstruction is found. My gates didn’t have the instructions to install this one but in 5 minutes trial and error we could figure out and worked great. My drive way has a bit of a slope that made it bit tricky to angle and place the emitter but worked out fine. I could have used some ways to adjust angles if it provided a hinge - but on second thought no hinge stays put for too long - so I am adding my own ways to tune it for my sloppy (literally) drive way - 15% gradient.

Works as advertised. Very sensitive with a fairly tight beam at 12'. I use one of these as a driveway alarm and another to protect entry in this area of my yard. A couple of hints/suggestions. First, test the unit before installing to make sure the relay works in both directions (one of my units had a bad relay. Amazon replaced it and the new one and another I bought work fine.) Testing will also enable you to learn the sensitivity, which is adjustable, and beam width for your application. In my driveway application, the beam was maybe three inches wide at 12' which was just right. I tied the center (white) and the 12V positive (I used the blue for positive) together so that I only needed a four conduction cable to connect to my alarm system and used the beam broken sense (black) and the 12V negative (brown) to drive a small relay which I then connect to a couple of alarm devices that typically look for a dry relay contact as input. Tieing the white and blue together saved me a connection. I used the 12V sense to drive a down stream relay in order to isolate the unit from the alarm system controls down stream. The other issue to pay attention to is the beam on/off pulse width which can be very short if, for example, you walk quickly through the beam. To be sure I didn't miss a beam break, I inserted a one second timer down stream before the second relay that basically converts a very short input pulse to a one second pulse so that I didn't miss a short pulse. May not be necessary in your application, but it was in mine and there is no downside to doing this. Amazon sells little adjustable timers for this purpose if you don't want to build one from a 555. It would be nice if this delay was built into the unit. I have seen other similar systems that have this function. I will also mention that while a decent reflector is included, you can use a low cost red type reflector Amazon also sells this very nice larger circular reflector, but it's $12 and not really needed unless maybe operating at maximum range. One tip on using the included reflector is that to make it easier to mount with a single screw, just drill a hole in the center label at the top of the reflector and use a small screw. Not sure why they didn't do this. I also found that the sensor unit needs to be more securely mounted than the reflector.

21 mA current draw on standby and 63 mA when the beam is obstructed. Perfect for battery backup gate/garage openers. It was remarkablely easy to align the transmitter and the reflector (after using a string with bubble leveling). Exactly what I needed. Highly recommended!

I'm an electrician and hobbyist. I wanted a doorbell for my dog. I bought a few different touch sensors, but nothing seemed to be both trainable and weatherproof. This laser is perfect. I added a Honeywell magnetic door switch to switch off the ding-dong'ing while walking out the door. However, the sensor input is not rated for 16 VAC and the magnetic switch is not rated for the 2-3 amps sometimes pulled by a doorbell. I used a multi-tap transformer as used on a furnace and have separate voltages running through the setup. 24 VAC @ 135 mA runs through the magnetic switch, cutting power to the sensor. 16 VAC runs through the relay, controlling the bell. After 4 years, I began having a continuous nuisance trip of the bell. I later realized my custom mounting had gotten loose. I adjusted it back and the bell is working again. However, the polycarbonate lenses are yellowing and the strength of the sensing is less than when new. As a failsafe, I plan on adding a multifunction timer to prevent the bell from grinding on for more than 5 seconds as letting this go on for hours unattended would definitely burn up the bell.

I use this to set up a stop over a grain dump and it lasted me 3 years before moisture got in it. For the price I would say that it is worth it.