Door Interlocking Systems

Finally, an easy way to interlock cleanroom doors and pass throughs. No complicated circuit boards to design, control panels to build or PLC’s to program. Sentry’s simple and expandable interlock modules control 2 - 10 doors – all interlocked. Sentry offers “stand alone” modules as well as a variety of expansion modules for automatic doors, access-controlled doors, roll up doors and pass throughs. We also offer units with adjustable, built in timers. All Sentry modules are easily programed and quickly installed and operational.

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Sentry Interlock’s EZ ModLock product line is a door interlocking system designed specifically to address door access control in Pharmaceuticals, Healthcare facilities and Data Centers. These systems are used to control the entry and exit of personnel and material in a secured area with multiple doors using predesigned logic scheme and fail-safe electric locks.

Unique customer requirements and changing security protocols dictate the need for an interlocking system that provides the flexibility to make easy and quick changes and is maintenance free. Oftentimes these systems are designed from scratch, assembled in a job shop and are difficult to install using cumbersome wiring schemes. Then any changes to the interlocking scheme makes onsite changes difficult and time consuming. The EZ ModLock system is very flexible, easy to implement and easy to use.


The EZ ModLock family of door interlocking products makes the design, implementation and field adjustment of your door interlock system quick and easy. The Module design incorporates all aspects of door interlocking technology. The only component required is an EZ ModLock Module and the associated Door hardware (fail-safe lock, door position switch, indicator lights and pushbuttons). The Modules even ship pre-programmed to a customer’s locking scheme. Installation is easy with the use of plug & play cables and a minimum number of components to wire up. Various interlocking logics are easily set in the field by simply adjusting the DIP switches located on the rear of every Module.

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EZ Modlock Products


Door Interlock Accessories supplement the EZ ModLock Modules by providing visual indication and control next to each
door. The LED Indicators provide visible indication of the door lock status. The stainless steel pushbutton (P/B) can serve as an Emergency Override (EO) switch or as a single door release. The red mushroom pushbutton provides an easily accessible and visible Emergency Override switch.

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Sentry Interlocks offers an integration service that makes the implementation of the EZ ModLock solution even easier and quicker. The EZ ModLock Modules and power supplies can be mounted in any commercially available enclosure before shipping.

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  • Predesigned Modules take the guesswork out of custom solutions
  • Pre-programmed Modules make installation quick and easy and the use of plug & play cables eliminate time consuming wiring
  • Flexibility to make onsite changes to door interlocking with minimal effort
  • Works with all doors – swing, sliding, roll-up and Pass-throughs
  • Can control Material Air Locks, Personnel Air Locks, Gowning Rooms, Pass Boxes/Throughs, Air Showers
  • Compatible with most access control devices such as simple pushbuttons, wave sensors, card swipes, badge readers, numeric keypads etc.
  • Time delay option as well as ability to activate ventilation blowers or UV lamps to isolate areas to allow time to condition the contained air
  • Provides input to Building Management Systems or other external monitoring systems (like fire alarms) for centralized monitoring of door status
  • LED indicators on each Module and optional Door Indicators provides visual door status
  • Optional Door Indicators have an audible alarm if the door is left open for more than 20 seconds, is forced open or in the event of a “simultaneous door opening”
  • Up to 10 doors can be interlocked on one system

  • This field is for validation purposes and should be left unchanged.