DMP SM-20WG 3" Wide Gap Contact

DMP SM-20WG 3" Wide Gap Contact

Overview

The DMP SM-20WG is a 3-inch wide gap magnetic contact designed for security integrators and access control installers who require flexible door and window monitoring across standard and non-standard opening widths. This contact provides a cost-effective solution for perimeter security and building automation applications where door positioning and frame conditions demand extended sensing distance.

Wide gap contacts like the SM-20WG accommodate installations where traditional standard-gap sensors cannot bridge the physical separation between door frame and moving panel. The 3-inch specification allows integrators to work with older frames, metal doorways, and custom installations without requiring multiple contact pairs or specialized mounting brackets.

Key Features

• 3-Inch Wide Gap Design: Bridges door-to-frame distances up to 3 inches, accommodating non-standard frame conditions and retrofit applications
• Magnetic Reed Switch Technology: Reliable, contact-based switching with no electronic components in the sensor element
• Durable Construction: Engineered for commercial and industrial environments with standard surface or recessed mounting options
• Security Integration Compatible: Direct integration with DMP control panels and third-party access control systems
• Field-Proven Reliability: Suitable for both new installations and legacy system upgrades
• Flexible Installation: Works with various door types including wood, metal, and composite frames

Integration & Compatibility

The SM-20WG integrates directly into DMP security control systems and compatible third-party access control and alarm monitoring platforms. As a passive magnetic contact, it requires only basic wiring to a monitored input zone on your control panel—no specialized communication protocols, IP addressing, or encryption overhead. This simplicity makes it ideal for distributed perimeter applications and retrofit projects where rapid deployment is critical.

Installers appreciate the SM-20WG's compatibility with standard door frame preparation and its ability to reduce system complexity on larger properties. Whether deployed as part of a new integrated access control system or retrofitted into existing alarm infrastructure, the contact provides consistent and predictable performance across varied installation conditions.

Typical Applications

Common deployment scenarios include:

• Industrial and warehouse facility perimeter doors with aged or irregular frames
• Retrofit security upgrades to existing buildings where frame replacement is impractical
• Exterior roll-up and overhead doors with extended mounting gaps
• Access control systems requiring both standard and extended-gap coverage across a property
• Multi-building campuses where frame conditions vary by structure age and construction method

The DMP SM-20WG delivers straightforward, contact-based door monitoring when gap distance is a primary constraint. Its 3-inch specification, magnetic reed design, and integration flexibility make it a practical choice for security professionals managing diverse facility types and upgrade scenarios.

Marty Allison

I've specified the DMP SM-20WG on several retrofit projects where standard 1-inch gap contacts simply wouldn't work with the existing frame conditions. The 3-inch wide gap design eliminates the need for creative (and often unreliable) workarounds. It's particularly valuable on industrial properties where doors have settled or frames have warped over time—situations you encounter far more often than the clean new construction case.

Technical Highlights:

• Gap Accommodation: 3-inch specification handles non-standard door-to-frame distances without additional hardware or creative mounting solutions
• Passive Design: Magnetic reed technology requires only basic 2-wire connection to control panel zone input; no power draw, no communication overhead

Deployment Considerations:

• Confirm actual gap distance on-site before ordering; measure at multiple points on the door frame to ensure the SM-20WG will accommodate settling or misalignment
• Verify DMP control panel or third-party system supports passive magnetic contacts on monitored zones; virtually all modern systems do, but legacy systems occasionally require zone module confirmation
• Plan wiring runs early—3-inch gap contacts often end up further from the control panel than standard contacts, which can affect wire routing in retrofit scenarios

The SM-20WG solves a real problem on aged properties and retrofit jobs. It's not fancy, but it eliminates one of the most common reasons integrators end up redesigning door coverage on difficult installations. Stock it for customer callbacks and upgrade projects—you'll use it.