--- title: "Access Control Explained: How Door Access Systems Work | Qyvea Kenya" url: https://qyvea.co.ke/access-control-explained-kenya description: "How access control works: readers, credentials, controllers, electric locks, exit devices and software, with a system diagram, fail-safe vs fail-secure and what to plan for." updated: 2026-10-17 --- > Markdown copy of https://qyvea.co.ke/access-control-explained-kenya for AI assistants. Prices and stock change; check the live page. 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A key that was copied once will open your door for as long as the lock stays the same. Read on: it takes a few minutes and could save you a lot more than that. **In this guide you will see:** - Five parts: reader, controller, lock, exit device, software. - The controller makes the decision, not the reader. - Fail-safe locks unlock when power is lost; fail-secure locks stay locked. Quick answer An access control system decides who can open a door and when. A reader identifies the person (card, fingerprint, face or PIN), a controller checks whether they're allowed in right now, and if so it releases an electric lock. An exit device lets people out, and software records every event. [Photo: Jakub Zerdzicki / Unsplash](https://unsplash.com/photos/36K2PZYNfcM) Why this matters now ## Every day with uncontrolled doors is a day you cannot say who was inside. ### If you wait - Keys copied and never returned - A leaver who still holds access - No record of who entered the store room ### What you get - Cards, fingerprints or faces set by door and by hour - Remove a person in one click - A log of every entry [Rosslare AC G44 Reader](/products/rosslare-ac-g44-reader-22147 "Rosslare AC G44 Reader")[ZKTeco ZK LMB -2805](/products/zkteco-zk-lmb-2805-maglock-2637 "ZKTeco ZK LMB -2805 MAGLOCK")[Dahua DH-ARD312 access controller](/products/dahua-dh-ard312-access-controller-13950 "Dahua DH-ARD312 access controller") [Get my free quote on WhatsApp](https://wa.me/254113301244?text=Hi%20Qyvea%2C%20I%20read%20your%20guide%3A%20Access%20Control%20Explained%3A%20How%20Door%20Access%20Systems%20Work.%20I%20want%20access%20control%20sorted.%20Can%20you%20help%3F)Reply usually within 30 minutes. Free site survey in Nairobi and nearby counties. Real products, live prices, in stock now ## Key takeaways - Five parts: reader, controller, lock, exit device, software. - The controller makes the decision, not the reader. - Fail-safe locks unlock when power is lost; fail-secure locks stay locked. - Escape routes must always let people out. - Every entry is logged, and lost credentials can be disabled instantly. ## How a door decides Access control architecture Readercard, fingerprint, face or PIN Controllerchecks rules and schedules Electric lockmaglock or electric strike Exit deviceexit button or break-glass Software / networkusers, logs, reports 1. **Present credential**: Card, finger, face or PIN at the reader 2. **Controller checks**: Is this user allowed through this door at this time? 3. **Lock releases**: For a few seconds, then relocks 4. **Door sensor confirms**: Knows the door opened and closed 5. **Event logged**: Who, which door, when ## Credentials | Credential | Strength | Weakness | | --- | --- | --- | | Card / fob (RFID) | Cheap, fast, familiar | Can be lent, lost or copied (older types) | | PIN | No hardware to carry | Codes get shared | | Fingerprint | Can't be lent | Worn or wet fingers; reader placement matters | | Face | Hands-free, fast | Lighting and privacy considerations | | Mobile / QR | Great for visitors | Needs a phone and the right system | Compare the biometric options in [fingerprint vs face recognition](https://qyvea.co.ke/fingerprint-vs-face-recognition-kenya). ## Locks and what happens without power #### Fail-safe Needs power to stay locked Unlocks on power loss Typical for maglocks on escape routes #### Fail-secure Needs power to unlock Stays locked on power loss Typical for strikes on store rooms **Important**: Doors on escape routes must always let people out: with an exit button, a break-glass release and fail-safe behaviour where appropriate. See [maglock vs electric strike](https://qyvea.co.ke/magnetic-lock-vs-electric-strike-kenya) and [exit devices](https://qyvea.co.ke/access-control-exit-devices-kenya). ## Standalone vs networked #### Standalone Reader and controller in one unit Managed at the door Good for one or two doors #### Networked Central software and database Many doors, one user list Instant revocation, central logs Planning a system? Start with the [access control planning guide](https://qyvea.co.ke/access-control-planning-guide-kenya). ## See it in a real installation ### Face Recognition Access Control on an Office Door A face recognition terminal, with a fingerprint sensor as a second option, mounted beside an office door. Authorised staff are recognised and the door releases. [About this sample project →](https://qyvea.co.ke/face-recognition-access-control-video-kenya)[More sample projects →](https://qyvea.co.ke/security-installation-videos-kenya) ### Fingerprint Door Access Control: How It Works A fingerprint and keypad access control reader mounted beside a glass office door. Staff unlock the door with a fingerprint, with a PIN as a backup. [About this sample project →](https://qyvea.co.ke/fingerprint-door-access-control-video-kenya)[More sample projects →](https://qyvea.co.ke/security-installation-videos-kenya) ## Frequently asked questions What happens to access control in a power cut? It depends on the lock. Fail-safe locks release; fail-secure locks stay locked. Backup batteries keep the system working through outages. Can I get a report of who entered? Yes. Every access event is logged and can be exported as a report. What if an employee loses their card? The card is disabled in the software straight away and a new one is issued. No locks need changing. ## Why customers choose Qyvea **Genuine brands**: Manufacturer warranty on what we sell, so you are not gambling on the box. **One team, start to finish**: The people who advise you also install and support it. **Fast answers**: WhatsApp replies usually within 30 minutes, and delivery within 24 hours in Nairobi. **Easy to buy**: Pay by M-Pesa, bank transfer or card. Free delivery in Nairobi on orders over KES 5,000. **Risk taken off you**: 7-day returns and exchanges on products, and a workmanship warranty on installations. **Customers say so**: Rated 4.6/5 from 57 Google reviews. **Your next step takes one minute:** send us a photo of the place on WhatsApp and we will tell you what it needs. ## Related articles [Access Control · Guide Access Control Planning Guide Which doors to control, which credentials to use, and why. 3 min read**READ FULL ARTICLE →**](https://qyvea.co.ke/access-control-planning-guide-kenya)[Access Control · Comparison Magnetic Lock vs Electric Strike Maglocks hold the door with a magnet; electric strikes release the latch. How to choose for glass doors, wooden doors, fire exits and store rooms. 2 min read**READ FULL ARTICLE →**](https://qyvea.co.ke/magnetic-lock-vs-electric-strike-kenya)[Access Control · Comparison Fingerprint vs Face Recognition Which biometric suits your door or attendance point? Speed, reliability, dirty or worn fingers, lighting and data protection compared. 2 min read**READ FULL ARTICLE →**](https://qyvea.co.ke/fingerprint-vs-face-recognition-kenya) ### Related services [Access Control](https://qyvea.co.ke/door-access-control-kenya)[Biometric Access Control](https://qyvea.co.ke/biometrics)[Access Control Repair](https://qyvea.co.ke/access-control-system-repair-kenya) ### Related products [ZKTeco F22 fingerprint reader](https://qyvea.co.ke/zkteco-f22-fingerprint-reader-kenya)[Hikvision intercom kit](https://qyvea.co.ke/hikvision-intercom-kit-kenya) ### Related projects [Biometric access control installation](https://qyvea.co.ke/projects#biometric-case-study) [Next →**Access Control Schedules, Anti-Passback & Audit Logs**](https://qyvea.co.ke/access-control-schedules-anti-passback-logs-kenya) ## Need this system installed? Talk to Qyvea. We design, install and maintain it. 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