How laser sensor/switch work with relay 

So let's say you want a gas heater to turn off if say a Jet Airplane Hanger door(s) open. Which are huge normally so that when the door is open the Gas heaters are not running and wasting heat. Once the laser beam is triggered, tripped or blocked. A relay would open the 120v power and turn off the Gas heaters and close a gas valve. Cause and effect! If one thing happens it changes or causes something else to happen.

If the relay is conected in circuit as a load result is a PNP sensor.

Maybe you need this, www.ato.com/digital-counter-6-digit-up-down

0-20 meter depends on model

Thanks for your request. You can get a quote here: www.ato.com/laser-sensor

It's a laser sensor. For details, check out here: www.ato.com/laser-sensor

Price link, www.ato.com/laser-sensor

price link, www.ato.com/laser-sensor