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Writer's pictureJordan Tuck

Unlocking Elevator Safety: The Critical Role of Door Lock Monitoring (DLM)

Elevators are essential for vertical transportation in modern buildings. Behind their smooth operation lies a critical safety feature: Door Lock Monitoring (DLM). Let’s explore why DLM is important, how it works, and why property owners should prioritize compliance.


Understanding Elevator Door Lock Monitoring


What Is Elevator Door Lock Monitoring?

Imagine stepping into an elevator while looking at your phone, and it starts moving with the doors still open. This creates a very dangerous situation for elevator passengers.


Woman looking at phone walking onto elevator

Elevator Door Lock Monitoring (DLM) is a safety system mandated by the American Society of Mechanical Engineers (ASME) A17.1 and A17.3 safety codes. It ensures elevators do not move unless the doors are fully closed and the circuit is functioning correctly. 


DLM uses sensors to continuously monitor door positions and signal the controller when it is safe to move. This system ensures the elevator does not proceed to its next dispatch or destination until both doors are fully closed. You may have experienced an elevator "releveling," where the car slightly adjusts its position with the doors open. This feature helps reduce tripping hazards when heavier loads enter the car, keeping passengers safe.


DLM is capable of detecting issues such as jumpers across the door lock circuit during troubleshooting or actual hardware failures. Without DLM and its safety monitoring, accidents can have devastating consequences for passengers.


Why Elevator Door Lock Monitoring Matters


  1. Enhanced Elevator Safety

DLM reduces the risk of accidents caused by the elevator moving with open doors. This safety measure protects passengers from falls, injuries, and getting trapped. It is especially important in busy buildings like offices, malls, and apartments, where one accident could affect many people.


Additionally, DLM provides peace of mind to building users, making them feel safe and confident in building management.


  1. Reduced Liability for Property Owners

Not following DLM regulations can lead to legal and financial problems, including fines and lawsuits. Property owners need to keep their buildings safe because ignoring DLM can lead to negligence claims. Some states, such as South Carolina, do not require the retrofit of units without DLM. With that said, if an accident occurred, it is possible that there could be a liability issue for a known “safety device” that was not installed. 


Ensuring compliance protects passengers and shields property owners from serious consequences.


  1. Avoiding Costly Fines and Penalties

States impose fines and may shut down non-compliant elevators until they meet safety standards. This can disrupt building operations and inconvenience tenants and visitors. Fixing fines and legal issues can cost more than installing or upgrading DLM systems.


Being proactive with compliance is both a safety measure and a cost-effective strategy. By investing in DLM, property owners can avoid financial burdens and keep their elevators running smoothly.


Ensuring Compliance: Is Your Elevator Up to Standard?


DLM requirements vary by state, but regardless of the year they were put in place, enforcement likely wasn’t immediate. This means that some elevators might lack Door Lock Monitoring and the only way to be sure is to consult a trusted elevator professional


Technician inspecting an elevator

Regular inspections and maintenance by certified technicians can ensure your elevators meet all safety standards, including DLM requirements. Keeping up with software updates also ensures the systems work well and follow the latest safety codes.




Customized Compliance Solutions with Metro Elevator

If your elevator lacks Door Lock Monitoring, you have two options: add an overlay or modernize the elevator.


  1. Adding an Overlay

This involves installing extra safety features without major changes to the existing system, making it a cost-effective solution for many buildings. 


  1. Consider Modernizing

Elevator modernization involves comprehensive upgrades to the elevator’s control and safety systems, offering long-term benefits like better performance, reliability, and compliance with the latest standards.


Working with a reputable elevator service provider is crucial. Metro Elevator, a leading company in the industry for nearly 40 years, offers expert advice on the best approach for your situation. With clients across the country and expertise in maintenance and repair, modernization, inspection, and installation of elevator systems, Metro Elevator ensures seamless integration of DLM and adherence to all relevant codes.


The Importance of Proactive Maintenance and Ensuring Long-Term Safety


Even with DLM in place, regular maintenance is essential to keep elevators safe and reliable. Scheduled inspections can catch potential problems early, reducing the risk of accidents and costly repairs.


Elevator service providers like Metro Elevator offer maintenance plans tailored to your needs, including regular checks of the DLM system, door sensors, and other critical components. 


By keeping your elevators in top condition, you can provide a safer environment for all passengers.


Invest in Safety and Understand DLM Costs

The cost of DLM varies based on the type of equipment. You might need an engineered overlay, but universal DLM systems are available. While the initial cost might seem high, it is a worthwhile investment for the enhanced safety and compliance it provides.


Build a Safety Culture: Training and Awareness

As a facility or property manager, it’s important to know the safety features of your elevators and how they keep riders safe. Being informed can foster a safety-conscious environment, ensuring everyone understands the role of DLM and other safety measures.


If you’re interested in learning more about DLM and the latest code updates in your area, reach out to Metro Elevator for a free consultation or training session.


Maintain a Safe and Reliable Elevator Experience


Bustling crowd exiting an elevator

Regular elevator maintenance is essential for ensuring the smooth and safe operation of the equipment. Scheduling consistent inspections and servicing prevents minor issues from becoming major problems that could disrupt operations and pose safety hazards.


Working with reputable technicians like those at Metro Elevator is crucial, as their expertise enables them to spot and fix potential issues early on.


Enhance Elevator Safety with Metro Elevator


DLM isn’t just a requirement—it’s about keeping everyone safe. Equipping your elevators with reliable Door Lock Monitoring systems is essential for protecting passengers and maintaining compliance with safety standards. 


Whether you need to install a new system, upgrade an existing one, or simply confirm that your elevators are compliant, working with experienced professionals like Metro Elevator is key. With locations across the country including New England, New York, Virginia, Raleigh, the Carolinas, Coastal Carolina, Utah, the Northwest, and NorCal, Metro Elevator delivers unmatched elevator solutions tailored to the unique needs of each region. 


Remember, every elevator must have reliable safety features like DLM to ensure passenger safety and compliance. Contact us today to ensure your passengers ride with peace of mind.


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Jordan Tuck is the Vice President of Metro Elevator Coastal Carolina and brings over 4 years of elevator industry experience to his role. Learn more about Jordan and his team.


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