Perhaps the best way to protect overhead door contacts from industrial motorized traffic like forklifts and large trucks is to recess or bury them into the concrete floor, allowing vehicles of this type to safely pass over them totally unaffected.
The G.R.I. 4510 switch series has been designed from the ground up, so to speak, for just such an application. The 4510 series features all stainless steel construction for maximum resistance to corrosion and has a wide working gap for those loose or badly worn overhead doors.
To best visualize the installation process, it is recommended we temporarily mount the magnet to the door. Remember to choose a mounting point that will require a minimum amount of concrete removal.
Place switch on floor, testing the position of the switch to magnet. It is recommended that 1" to 1 1/4" be used as the operational distance. Marking this switch position with a felt tip marker, we can now begin chipping out concrete.
A channel approximately 1/2" to 3/4" deep and 1/2" wide will be sufficient. Place the switch in the opening and retest to confirm adequate gap. Apply concrete patch to contain and cover magnetic door switch and cable. Retest for positive operation by opening and closing the overhead door.
Name : GRI 4510A Concrete Concealed Switch, 3 1/2" Gap, Open/Closed Loop, SPDT, C Reed Form, 5W , George Risk Industries
Category : Magnetic Contacts
UPC Code : 697625003068
Country of Origin : United States. Country of origin is subject to change.
ADI Part Number : GI-4510A
Brand Name : GRI
Manufacturer : George Risk Industries
Manufacturer Part Number : 4510A
Product Model : 4510A
Product Name : 4510A Magnetic Contact
Product Series : 4510
Product Type : Magnetic Contact
Contact Configuration : SPDT
Contact Form : Form C
Contact Resistance : 140000 Micro Ohm
Contact Resistance (Ohm) : 0.14
Lead Length : 36"
Lead Length (mm) : 914.4
Mounting Type : Overhead
Recommended Use : Door
Standard Gap : 3.50"
Standard Gap (mm) : 88.9
Connectivity Technology : Cable
Application/Usage : Industrial
Color : Gray
Magnet Material : Alnico
Contact Type : Open/Closed
Limited Warranty : Lifetime
Country of Origin : United States
Package Contents : <ul> <li>4510A Magnetic Contact</li> <li>Mounting Hardware</li> </ul>