The Alarm Lock PG21MSS Pilfergard Advanced Door Alarm with Strobe is a heavy-duty, commercial-grade exit door alarm designed to monitor unauthorized door openings and provide both audible and visual security alerts.

Featuring a powerful electronic siren, integrated high-visibility amber strobe light, programmable alarm modes, magnetic door monitoring, and key-operated control, the PG21MSS provides reliable exit security for commercial, institutional, healthcare, and retail facilities.

Part of the Alarm Lock PG21 Series, this advanced microprocessor-controlled door alarm combines audible warning, visual notification, and remote monitoring capabilities in a compact, surface-mounted housing.

When the system is armed, opening the protected door activates the alarm, sounding the electronic siren and flashing the integrated amber strobe. The combination helps security personnel quickly identify which door has been opened, even in facilities with multiple exits.

Designed for standard commercial doors and narrow-stile aluminum storefront doors, the PG21MSS operates using a standard 9V alkaline battery, eliminating the need for hardwired power in basic installations.

The metallic silver / satin aluminum finish provides a clean appearance that complements commercial aluminum doors and frames.

Key Features and Benefits

High-Visibility Amber Strobe Light

• Integrated amber flashing strobe included with the PG21MSS model.

• Provides visual notification when the device enters alarm mode.

• Helps identify the activated door in large commercial facilities.

• Provides visual security alerts in addition to the audible siren.

• Ideal for buildings with multiple monitored exits.

• Strobe is integrated into the top of the alarm housing.

High-Output Electronic Siren

• Powerful electronic alarm designed to attract immediate attention.

• Manufacturer-rated sound output of 110 dB at 10 feet.

• Four selectable siren sounds.

• Selectable sweeping, steady, and pulsing alarm patterns.

• Programmable alarm duration and reset behavior.

• Helps discourage unauthorized use of emergency exits.

Advanced Magnetic Door Monitoring

• Magnetic actuator detects opening of the protected door.

• Continuously monitors door position when armed.

• Suitable for standard commercial and narrow-stile storefront doors.

• Magnetic alignment feature helps simplify installation.

• Supports additional external reed switches for multiple-door monitoring.

• Can provide audible notifications when monitored doors are opened.

Two Selectable Arming Modes

Always Armed Mode

• Designed for emergency exits and continuously monitored doors.

• The key cannot be removed while the device is disarmed.

• Returning the cylinder to the armed position allows key removal.

• Helps prevent the alarm from being unintentionally left disarmed.

Standard On/Off Mode

• Allows authorized personnel to arm or disarm the alarm.

• Key can be removed in either the armed or disarmed position.

• Ideal for shipping entrances, delivery doors, and employee access points.

• Provides flexibility for facilities with scheduled door usage.

Programmable Alarm Settings

• Four selectable siren sounds.

• Four alarm operating modes.

• Configurable alarm delays.

• Entry delay options of 15 seconds, 1 minute 15 seconds, or 3 minutes 15 seconds.

• Continuous or timed audible alarm settings.

• Automatic reset configurations.

• Door-annunciator operation for audible door-opening notifications.

• Built-in doorbell feature with an optional external button.

Battery-Powered Operation

• Powered by one 9V alkaline battery.

• Battery supplied with device.

• Approximately 2.5 years of typical standby battery life.

• Manufacturer estimates approximately 200 alarm sequences under typical conditions.

• Low-battery warning notification.

• Optional continuous external power connection.

• Compatible with 9–12VDC external power at 300mA.

• Internal battery may remain installed when external power is used.

Tamper Protection

• Electronic cover tamper monitoring.

• Unauthorized removal of the housing can activate the alarm.

• Key-controlled housing access.

• Dual-tamper supervision.

• Red LED indicator displays armed status.

Remote Monitoring Capabilities

• Integrated Form-C relay output.

• Supports connection to compatible security alarm panels.

• Can activate secondary notification equipment.

• Allows alarm signaling to compatible building security systems.

• Supports additional door contacts for monitoring multiple openings.

Technical Specifications

How the PG21MSS Door Alarm Works

1. System Arming

The device is armed using a compatible mortise cylinder and key. The front LED displays red when the system is armed.

2. Continuous Door Monitoring

A magnetic actuator installed on the opposing door or frame surface monitors the door's closed position.

3. Unauthorized Door Opening

When the protected door opens while armed, the magnetic contact changes state and the selected alarm sequence begins.

4. Audible and Visual Alarm Activation

The electronic siren sounds and the integrated amber strobe flashes, helping alert personnel and identify the affected door.

5. Remote Alarm Notification

The Form-C relay may activate compatible external alarm or security monitoring equipment.

6. Alarm Reset

Authorized personnel can disarm or reset the system using the required key. Reset operation depends on the selected programming configuration.

Typical Applications

Hospitals and Healthcare Facilities

• Emergency exits

• Stairwell entrances

• Restricted access doors

Assisted Living and Nursing Homes

• Monitored exit doors

• Facility stairwells

• Controlled-access areas

Schools and Educational Facilities

• Emergency exit doors

• Secondary hallway exits

• Gymnasium exits

• Service entrances

Retail Stores and Shopping Centers

• Rear stockroom exits

• Emergency exits

• Employee-only entrances

• Service corridor doors

Warehouses and Distribution Centers

• Shipping and receiving doors

• Emergency exits

• Inventory storage areas

• Restricted building exits

Restaurants and Entertainment Facilities

• Rear service entrances

• Kitchen emergency exits

• Theater exit doors

• Delivery entrances

Included Components

The PG21MSS is supplied as a complete door alarm assembly with:

• Alarm Lock PG21MSS electronic alarm housing

• Integrated amber strobe light

• Metallic silver housing and mounting baseplate

• Magnetic actuator assembly

• 9V alkaline battery

• Installation mounting hardware

• Manufacturer installation instructions and template

Important: Key-operated mortise cylinder, optional exterior rim cylinder, and external power supply are sold separately.

Optional Accessories

Alarm Lock CEM Mortise Cylinder

Provides interior key-operated alarm control for arming and disarming the device.

Alarm Lock CER Rim Cylinder

Optional cylinder for exterior key-operated control.

Alarm Lock PP100 Power Supply

Provides optional continuous power for applications where external electrical power is preferred.

External Magnetic Reed Switches

Allow compatible multiple-door monitoring applications.

Installation Information

The PG21MSS is designed for surface-mounted installation on compatible commercial doors and door frames.

The alarm is normally mounted on the interior side of the protected opening, with the magnetic actuator installed on the opposing surface.

Installation requires proper positioning of the magnet, mounting the alarm housing, installing the required mortise cylinder, and configuring alarm operation.

Additional wiring may be installed for external power, remote monitoring, doorbell functions, or additional magnetic contacts.

Important: The PG21MSS is an electronic door monitoring alarm, not an electronic locking device. It does not physically lock a door or provide delayed-egress locking. Installation must not interfere with emergency egress and must comply with applicable building and fire codes.

Why Choose the Alarm Lock PG21MSS?

The Alarm Lock PG21MSS Pilfergard Advanced Door Alarm with Strobe combines audible security, visual alarm notification, tamper protection, and flexible programmable monitoring in one commercial-grade device.

With its integrated amber strobe, metallic silver finish, long-life battery operation, and compatibility with standard and narrow-stile doors, the PG21MSS offers a reliable solution for facilities requiring visible and audible notification of unauthorized door openings.