The Alarm Lock PG21MB Pilfergard Advanced Door Alarm is a commercial-grade, battery-operated exit door alarm designed to monitor unauthorized door openings and improve building security. Featuring a powerful 95+ dB audible siren, programmable alarm settings, magnetic door monitoring, key-operated control, and a durable metallic bronze finish, this device offers reliable security for commercial, institutional, and high-traffic facilities.

Part of the Alarm Lock PG21 Series, the PG21MB uses advanced microprocessor-controlled technology to detect door openings and activate an audible alarm when the system is armed.

The device features a compact, surface-mounted design suitable for standard commercial doors and narrow-stile aluminum storefront doors. Its magnetic actuator monitors the door's position, triggering the alarm when the protected door is opened without authorization.

Designed for schools, hospitals, nursing homes, warehouses, restaurants, retail stores, and other facilities, the PG21MB provides a cost-effective solution for monitoring emergency exits, preventing doors from being left unsecured, and alerting personnel to unauthorized door activity.

The Metallic Bronze finish provides a professional appearance that complements dark bronze storefront systems and commercial door hardware.

Key Features and Benefits

Powerful Audible Exit Alarm

• High-output electronic sweeping siren rated over 95 dB.

• Four selectable siren sounds.

• Four programmable alarm operating modes.

• Audible alert activates when a protected door is opened while armed.

• Helps notify personnel of unauthorized exits or door activity.

• Selectable alarm duration and automatic reset configurations.

Advanced Magnetic Door Monitoring

• Magnetic actuator detects opening of the protected door.

• Designed to monitor standard commercial and narrow-stile doors.

• Magnetic alignment mode helps simplify installation.

• Can monitor multiple doors using compatible external magnetic reed switches.

• Ideal for emergency exit monitoring and preventing unauthorized door usage.

Two Selectable Arming Modes

Always Armed Mode

• Automatically returns to armed operation when the key is removed.

• Requires the operator to return the cylinder to the armed position before removing the key.

• Ideal for emergency exits and locations requiring continuous monitoring.

Standard On/Off Mode

• Allows authorized personnel to manually arm or disarm the alarm.

• Key-operated control provides flexibility for daily operations.

• Useful for delivery doors, employee entrances, and controlled access areas.

Programmable Alarm Functions

The PG21MB offers multiple programmable operating options:

• Four siren sound selections.

• Four alarm modes.

• Selectable entry delay settings.

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

• Continuous alarm or timed alarm shutdown.

• Automatic alarm reset configurations.

• Door annunciator function that can signal door openings while disarmed.

Battery-Powered Operation

• Operates using one standard 9V alkaline battery.

• Battery included.

• Approximately 2.5-year battery life under typical operating conditions.

• Low-battery warning provides maintenance notification.

• Optional external power supply capability.

• Can operate with compatible 9–12VDC external power at 300mA.

• Battery can remain installed as backup when external power is used.

Tamper Protection

• Electronic cover tamper protection.

• Unauthorized removal of the housing triggers the alarm when armed.

• Key-controlled cover security.

• Dual-tamper supervision helps detect attempts to defeat the alarm.

Remote Monitoring and Integration

• Built-in Form-C relay output.

• Compatible with appropriately configured security and alarm monitoring systems.

• Can activate secondary alarm equipment.

• Supports external magnetic reed switch monitoring.

• Optional doorbell function with installation of a compatible push button.

Technical Specifications

How the PG21MB Door Alarm Works

1. System Armed

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

2. Door Monitoring

A magnetic actuator installed opposite the alarm housing monitors the door's closed position. When the door is properly closed, the magnetic contact maintains normal monitoring operation.

3. Unauthorized Door Opening

When the armed door is opened, the magnetic contact changes state and activates the programmed alarm sequence. Depending on the selected settings, the siren sounds immediately or after the configured entry delay.

4. Audible Security Alert

The electronic siren alerts nearby personnel to the door opening. The integrated relay can also signal compatible remote security or monitoring equipment.

5. Alarm Reset

Authorized personnel can disarm or reset the device using the appropriate key-operated cylinder, according to the selected operating mode.

Typical Applications

The Alarm Lock PG21MB is ideal for commercial and institutional facilities requiring door monitoring and unauthorized exit notification.

• Hospitals and Healthcare Facilities: Monitor stairwell doors, emergency exits, and restricted areas.

• Assisted Living and Nursing Homes: Provide alerts when monitored exterior or stairwell doors are opened.

• Schools and Universities: Improve monitoring of emergency exits and secured access points.

• Restaurants: Monitor rear employee entrances, service doors, and emergency exits.

• Retail Stores: Detect unauthorized use of stockroom and rear exit doors.

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

• Commercial Office Buildings: Provide audible notification when secured exit doors are opened.

• Entertainment Facilities: Monitor theater exits and other controlled openings.

Included Components

• Alarm Lock PG21MB door alarm assembly

• Metallic bronze die-cast housing

• Magnetic door actuator assembly

• Surface-mount baseplate

• 9V alkaline battery

• Installation mounting hardware

• Manufacturer installation instructions

Note: Mortise cylinder and exterior rim cylinder are sold separately.

Optional Accessories

Alarm Lock CEM Mortise Cylinder

Compatible mortise cylinder for interior arming and disarming.

Alarm Lock CER Rim Cylinder

Optional rim cylinder for exterior keyed operation.

Alarm Lock PP100 Power Supply

Optional power supply that allows continuous operation while conserving the internal battery.

External Magnetic Reed Switches

Additional door contacts for monitoring multiple openings with one alarm.

Installation Information

The PG21MB is designed for surface mounting directly onto a commercial door or adjacent door frame.

Installation involves securing the alarm housing, positioning the magnetic actuator, installing the required cylinder, and configuring the alarm operating settings.

The device is suitable for standard commercial doors and compatible narrow-stile aluminum storefront systems.

Optional external wiring may be installed for remote monitoring, external power, additional door contacts, and doorbell functions.

Important: The PG21MB is an audible door monitoring alarm, not an electronic locking device or delayed-egress lock. It does not physically prevent or delay a door from opening. Installation must not interfere with required emergency egress.

Why Choose the Alarm Lock PG21MB?

The Alarm Lock PG21MB Pilfergard Advanced Door Alarm offers an effective combination of audible security, tamper protection, programmable monitoring, and simple battery-powered operation.

Its compact design, magnetic door monitoring, long battery life, and metallic bronze finish make it an excellent choice for commercial properties requiring dependable exit door security without installing a complete access control system.