Protection Simplified: Gartner Duet Safe Lock

If one mechanism fails to operate, the safe can be opened using the other, eliminating the possibly to have to drill and repair the container.


Since 2008, the number of residences having safes has increased significantly. Commercial safe sales have also increased. Many of the new safes sold are equipped with an electronic safe lock. Just about every safe manufacturer either offers the electronic safe lock as an option or on some models...


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Enter the existing “master” code. A double signal is emitted.

Enter the new “master” code. A double signal is emitted.

Enter the new “master” code a second time. A double signal is emitted.

If the “master” code was entered properly, the LED will extinguish.

Test the new “master” code. When the code has been entered, the LED will flash twice and a double signal will be emitted. Rotate the dial clockwise until the bolt retracts. If the lock will not unlock, the code change was not correct. If the code change was not correct, the old “master” code remains valid.

To add the second user code, press and hold the “1” button until a double signal is emitted and the LED stays illuminated.

Enter correct “master” code. A double signal is emitted.

Enter new second code. A double signal is emitted and the LED stays illuminated.

Enter new second code a second time. A double signal is emitted and the LED will extinguish.

Test the new second user code. When the code has been entered, the LED will flash twice and a double signal will be emitted. Rotate the dial clockwise until the bolt retracts.

Mechanical Combination Change

To change the mechanical combination, dial the combination, retract the bolt and open the door.

With the door open, dial the combination stopping at the changing index, not the opening index.

A hole in the cover of the safe lock at approximately 7 o’clock is where the change key is inserted and the combination changed. To change the Duet mechanical lock combination, use the change key part number T005.

Important: The combination must be dialed correctly for the change key to slide into place. Never force the change key into the opening.

When the change key is properly seated, rotate the handle clockwise until it stops. The wheels will be released, permitting the combination to be changed.

Dial a new combination to the changing index. Follow the same steps as when dialing the combination in order to open the safe. The only difference is to the changing index, not the opening index. Make sure the combination is properly dialed. If one of the numbers is off when dialed, the combination will reflect the new number.

The Duet lock body has the same bolt pattern and height and width dimensions as a standard combination lock. The thickness of the Duet lock is 1-1/2”, approximately 3/8” thicker than a standard lock body. The additional space contains the electronic components.

The straight-bolt Duet safe lock can be mounted in the four mounting directions. When retrofitting the Duet into a boltwork equipped safe, make sure there is approximately 1/16” clearance between the lock bolt and the cutout in the blocking bar of the boltwork.

The Duet Electronic Safe Lock is assembled in the United States.

The Duet Safe Lock is powered by a 9Volt alkaline battery. Battery life is rated at 3,000 openings. When the battery loses a sufficient amount of power, the lock will signal a low warning. Slide the battery door at the bottom of the lock counterclockwise and remove the old battery from the bottom. NL Lock recommends using Duracell or Energizer batteries.

Future models will have additional software features.

For more information, contact Nick Gartner at GartnerDev@aol.com.

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