Liftmaster S505AL Monitored Small Profile Resistive Edge w/ Aluminum Channel 5ft
The LiftMaster S505AL is a 5 ft small profile monitored resistive safety edge supplied with an aluminum channel. It is made for gate systems that require a monitored edge device rather than a simple contact-style edge. When the edge is compressed, the system is intended to signal the operator or edge transmitter so the gate can stop or reverse according to the operator setup.
This edge is commonly used on automated gate systems where a low-profile edge is needed on a vertical or horizontal mounting surface. The aluminum channel helps keep the installation straight and secure, which is important on moving gates exposed to weather, vibration, and repeated gate travel.
Correct selection is important because monitored edges, edge transmitters, receivers, and operator inputs must all match. The S505AL should be chosen by length, edge profile, mounting channel, and monitored resistive compatibility, not simply by appearance.
Compatible With
Common Compatible Applications
- LiftMaster gate operators requiring monitored resistive edge protection
- LiftMaster monitored wireless edge systems that support S50 style monitored resistive edges
- Swing or slide gate applications where a 5 ft small profile edge with aluminum channel is appropriate
- Vertical or horizontal safety edge mounting locations when approved by the gate layout
Related Edge Family to Verify
- S504AL - 4 ft small profile monitored resistive edge with aluminum channel
- S505AL - 5 ft small profile monitored resistive edge with aluminum channel
- S506AL - 6 ft small profile monitored resistive edge with aluminum channel
- S50 monitored small profile resistive edge family
Important Compatibility Notes
- Verify the required edge length before ordering.
- Confirm the operator or wireless edge system accepts monitored resistive edges.
- Do not replace a monitored edge with a non-monitored edge on a monitored input.
- Check whether the site needs small profile or large profile edge material.
Also Known As / Related Part Numbers
- S505AL
- LM-S505AL
- S50 5 ft monitored resistive edge
- S505AL monitored small profile edge
- S505AL aluminum channel edge
- Related: S504AL 4 ft version
- Related: S506AL 6 ft version
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Monitored resistive safety edge |
| Part Number | S505AL |
| Length | 5 ft |
| Profile | Small profile |
| Mounting Channel | Aluminum channel included |
| Application | Monitored gate edge protection |
| Compatible Operator Type | Select LiftMaster monitored gate operator safety systems |
| Mounting | Vertical or horizontal when installed according to instructions |
| Notes | Match length, profile, and monitored edge requirements before ordering |
Technician Note
If the original edge failed, inspect the channel, end caps, cable routing, wireless transmitter, and operator safety input. A crushed edge or water-damaged transmitter can create symptoms that look like a bad operator board.
Before Ordering Checklist
- Measure the existing edge length before ordering.
- Confirm the required profile size and mounting channel style.
- Verify monitored resistive edge compatibility with the operator or wireless edge transmitter.
- Check whether the edge mounts vertically, horizontally, on the leading edge, or on another approved location.
- Inspect the gate for sharp edges, dragging, or physical damage that could damage the replacement edge.
Important Ordering Warnings
- S505AL is not interchangeable with every S50 or L50 edge length.
- Do not assume a non-monitored edge can replace this monitored edge.
- Cutting, drilling, or modifying the edge can affect safety monitoring.
Professional Advisory
Safety edges are entrapment protection devices. Do not bypass monitored edge inputs to keep a gate running. If the operator will not run because of a safety fault, have the system diagnosed by a qualified gate technician.
Product Questions & Answers
Is the S505AL a monitored safety edge?
Yes. The S505AL is a LiftMaster monitored small profile resistive edge supplied with an aluminum channel for compatible gate safety applications.
How long is the S505AL edge?
S505AL is the 5 ft version in the LiftMaster small profile aluminum channel monitored resistive edge family.
Can the S505AL mount vertically or horizontally?
Yes. This edge family is designed for vertical or horizontal mounting when installed according to the gate layout and LiftMaster instructions.
Is S505AL the same as S504AL or S506AL?
No. They are related small profile aluminum channel monitored edge models, but the number usually indicates the length. S504AL is 4 ft, S505AL is 5 ft, and S506AL is 6 ft.
Can I cut or modify this monitored edge?
Do not cut or alter a monitored edge unless the manufacturer instructions specifically allow it. Modifying the edge can affect monitoring and safety operation.
