The Alarm Lock PG21MS Pilfergard Advanced Door Alarm is a heavy-duty, battery-operated commercial door security alarm designed to monitor unauthorized door openings and provide immediate audible notification when a protected door is opened.

Featuring a powerful 95+ dB electronic siren, programmable alarm modes, magnetic door monitoring, key-operated arming and disarming, and a durable metallic silver finish, the PG21MS delivers dependable exit monitoring for commercial and institutional facilities.

Part of the Alarm Lock PG21 Series, this microprocessor-controlled alarm is designed for surface mounting on standard commercial doors and narrow-stile aluminum storefront doors. Its compact housing provides flexible installation without requiring a complete electronic access control system.

When the alarm is armed, a magnetic actuator monitors the door's closed position. Opening the protected door activates the programmed alarm response, alerting building personnel to unauthorized exit activity.

The PG21MS Metallic Silver model does not include a strobe light. For applications requiring a visual flashing alarm, the PG21MSS model is available separately.

Key Features and Benefits

High-Output Audible Security Alarm

• Powerful electronic sweeping siren rated over 95 dB.

• Manufacturer specification lists 110 dB at 10 feet.

• Four selectable siren sounds.

• Programmable continuous or timed alarm operation.

• Automatic alarm reset options.

• Helps discourage unauthorized use of emergency and restricted exits.

Magnetic Door Monitoring

• Magnetic actuator detects when the protected door opens.

• Monitors commercial entrance and emergency exit doors.

• Compatible with standard and narrow-stile doors.

• Magnetic alignment feature simplifies installation.

• External reed switch connections allow multiple-door monitoring.

• Suitable for single- and double-door monitoring configurations with appropriate contacts.

Two Selectable Arming Modes

Always Armed Mode

• Designed for exits requiring continuous monitoring.

• The key must be returned to the armed position before removal.

• Automatically restores armed operation when the key is removed.

• Ideal for emergency exit monitoring.

Standard On/Off Mode

• Allows authorized personnel to arm or disarm the device.

• Key-operated control provides flexibility during business hours.

• Suitable for delivery entrances and employee access doors.

Programmable Alarm Functions

• Four selectable siren sounds: sweeping, pulsing sweep, steady, and pulsing steady.

• Four alarm configurations for different security applications.

• Optional entry and exit delays.

• Selectable two-minute siren shutdown.

• Latching and non-latching alarm configurations.

• Door-ajar monitoring capability.

• Audible door annunciator function.

• Adjustable annunciator volume.

Long-Life Battery Operation

• Powered by one 9V alkaline battery.

• Battery included.

• Approximately 2.5 years of typical standby battery life.

• Low-battery audible and visual alerts.

• Optional external power supply connection.

• Supports 9–12VDC external power at 300mA.

• Internal battery may be retained when external power is connected.

Tamper-Resistant Security

• Electronic cover tamper protection.

• Unauthorized housing removal activates the alarm when armed.

• Key-controlled cover access.

• Dual-tamper supervision.

• Red LED indicator shows armed status.

Remote Monitoring Capabilities

• Integrated Form-C relay output.

• Compatible with properly configured security monitoring equipment.

• Allows connection to compatible fire or burglary alarm panels for alarm signaling.

• Supports secondary audible alerts and external notification equipment.

• Built-in doorbell function available with an additional push button.

Technical Specifications

How the Alarm Lock PG21MS Works

1. System Arming

The PG21MS is activated using a compatible mortise cylinder. When armed, the red status LED illuminates, indicating that the protected door is being monitored.

2. Door Position Monitoring

The magnetic actuator detects whether the protected door is closed. While the door remains closed, the system continues monitoring for unauthorized openings.

3. Unauthorized Door Opening

When the door opens while the system is armed, the magnetic contact changes state and activates the programmed alarm sequence.

Depending on the selected configuration, the alarm may sound immediately or after the programmed entry delay.

4. Audible Security Notification

The electronic siren alerts nearby personnel. The integrated Form-C relay can also activate compatible external security equipment.

5. Alarm Reset

Authorized personnel can reset or disarm the alarm using a compatible key-operated cylinder. Automatic reset behavior depends on the selected alarm mode.

Typical Commercial Applications

• Hospitals and Healthcare Facilities: Monitor stairwells and emergency exits.

• Assisted Living Facilities: Provide notification when monitored doors are opened.

• Schools and Universities: Improve unauthorized exit monitoring.

• Retail Stores: Monitor stockroom, rear entrance, and emergency exit doors.

• Restaurants: Detect unauthorized use of kitchen and rear service entrances.

• Warehouses: Monitor shipping areas, restricted doors, and emergency exits.

• Commercial Offices: Provide audible notification of unsecured door activity.

• Shopping Centers: Monitor service corridors and secondary access doors.

• Government Facilities: Improve exit monitoring in controlled areas.

Included Components

• Alarm Lock PG21MS door alarm assembly

• Metallic silver housing and mounting baseplate

• Magnetic actuator assembly

• 9V alkaline battery

• Mounting hardware

• Installation instructions and mounting template

Note: Mortise cylinder, optional exterior rim cylinder, and external power supply are sold separately.

Compatible Accessories

Alarm Lock CEM Mortise Cylinder

Provides interior key-operated arming and disarming.

Alarm Lock CER Rim Cylinder

Provides optional exterior key-operated alarm control.

Alarm Lock PP100 Power Supply

Optional continuous power supply for installations where external power is preferred.

External Magnetic Reed Switches

Support remote magnetic contact monitoring or multiple-door configurations.

Installation Information

The PG21MS is designed for surface mounting onto a compatible commercial door or door frame.

The device is generally mounted on the protected door with the magnetic actuator positioned on the adjacent frame, although alternative mounting arrangements are possible.

Installation requires proper alignment of the magnetic actuator, mounting the alarm housing, installing a compatible mortise cylinder, and configuring the desired alarm settings.

Optional wiring can be connected for remote monitoring, external power, doorbell operation, or additional magnetic contacts.

Important: The PG21MS is an audible door monitoring alarm. It does not contain an electric locking mechanism and does not delay or prevent emergency egress. Installation must comply with applicable building and life safety requirements.

Why Choose the Alarm Lock PG21MS?

The Alarm Lock PG21MS Pilfergard Advanced Door Alarm provides dependable commercial door monitoring with flexible programming, strong audible notification, and convenient battery-powered operation.

Its metallic silver finish, compact surface-mounted design, tamper protection, and remote monitoring capabilities make it an excellent choice for businesses requiring reliable unauthorized exit detection without a complete access control installation.