Dual Beam Infrared Detectors

Need a recommendation on an "dual beam infrared motion detector OR alarm sensor" for a "warehouse" overhead door that is never used. Also, it is right next to a train track.

Any guidance would be greatly appreciated. Will be attached to strobe light and possibly the alarm system. On a fact gathering mission only at the moment. Thanks.

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**** ** **** ** ** * ****** ******? *** ** be * **** *******?

**** *** ******** ***** **** ** ******** ***** * ******* at ***?

*** **** **** *** **** ** '**** ****' - ****** dual ** ******** ****** * ****** *********** *** ***** ***** positives, ** *** ******** ********, ** ******** *****-**-*****. ***, * find ***** *** **** ***** ********** *** ***** ****, *** has **** ****** **** ******* **** ******* - ** *****. I *** * *** ** ***** *******-*******, ******** ******. ********* makes ************* *********, **** ***-******* ******* *** **** ******* *** such.

****** *** **** ******** *******! *'* **** **** *** **** our ******* ******** ******** *** **** *** **** ******* "**** better **** *******"! ** *** ****!

***** ***! *'** **** **** **. *** *****, *** ** can ** * **** *******. *'* **** ****** ** **** ideas ****** *** **** ********* ***** ** ******** ******** **.

**, **** ** * ****** ** ******** *** ****** ** two *****: ****** ******* *** ********* ***** ***** *******. *******, overhead **** ******** *** ***!

** *** ******* ** **** ***** ***** ** *** ** someone ** ******* *** ******** ****?

** **** ***********, * ***** * **** ******* ***** ** better ******* *** **** ** ********** **** *** ******* * forklift **** * ******* ***** ********. *******, * **** **** simple **** ********* ** * ****** ******** **** ***** ** to **** ****** ****** ** **** *** *******.

* *** ******* ***** **** ************ ******* *** ***** ***** runs * *** **** ****** *** ******** ****. *** **** is *** ****** **** ****** *** ***** ** ******* ***** entry ******* ***** *****.

* ***** *** ***** ** ******* ******* ***** **** ****** to ***** ********* ** ********* ******, *** **** **** ****:

*. * ******* ** **** ****** ** *** **** ** opened.

*. ** *** **** ** ******* ******* * **** ** the **** *** ******** *******, **** **** **** **** ****** sensor ***** ** *** **** ******.

*********** ******* "**** **** ******** ****** ********". ******** "**** ****" would ***** ** ************* (****** ********) *****, ***** "**** ****** Detector" ***** ***** ** * ****** ******** ********* *** (******* Infrared) *** *********, ** **** *** **********. ** ***** *********, the *** ** * **** ******* **** **** ****** *** door ***** ******...*** *** *******. ***** * **** ****** ******** will ***** ***** ******, *** ********* *** ***** ******* *** critical *** *******-**** *********. (*.*. ******** **** *** ******** ***** a ****** ***** ****** ***** ** *** ********, *** ****** from *** **** *****, ***.). * **** ** **** ********* across *** ******* ***** ******* ****** *** ***** ***** ********* and **** ******* ******* ******** ******* ******* *** ****. *******, I ***** ********* ******-******** *** ***** ** ***** ****** ****** by ******** ****** ***** ***** (** ****) * ****** *** of *********. **** **** *****.

****** ***, ******* ** *** ******** ** *** **** ** is * *** ******. ****** *** *** *** ***********, ******* appreciated.

* ******* *** ***** ******* ***** ******. ** ****** ** not * *******.

******** * **** ********* *****. *'** **** **** ** *** past *** ****'** **** ****. **** **** **** *** **** beam ****** ** ** *****