We noticed that when many customers choose automatic door openers, they do not know whether their door is pushed or pulled. The picture below can help you understand.If you want to buy an automatic door opener stopper, as below:See which one its yours,as below:Another way is: By looking at the top of the door, you can tell if you need to push or pull and avoid embarrassment. If there is something on the inside of the frame (same side as you), push the door. If you see nothing blocking the frame, pull it open.Of course, if these pictures can't solve your problem, you can also send us pictures at any time.We have professional sales who can give you an accurate answer.S4A Industrial Co.Limited

Dear S4A Valued Partners,We hope this notice finds you in good health and high spirits. We would like to inform you of an upcoming holiday, the Dragon Boat Festival, which will be observed on 22nd, June,2023In celebration of this traditional Chinese festival, our company will be closed from 22nd to 24th, June 2023 The Dragon Boat Festival is a time for families and friends to come together, pay respects to ancestors, and enjoy cultural activities such as dragon boat races and eating zongzi (sticky rice dumplings).During this holiday, we encourage you to take some time off, recharge, and spend quality time with your loved ones. It is essential to prioritize rest and relaxation to ensure a healthy work-life balance.Please make the necessary arrangements to complete any pending tasks or projects before the holiday begins. If you require assistance or have any concerns, kindly reach out by email or phone:Email: sales@s4a-access.com  Phone: 0086 134 1050 0721 (All urgent technical issues are resolved within two hours)We will resume normal operations on 26th, June 2023, and your presence and dedication will be highly appreciated as we return to work.We wish you all a joyful and memorable Dragon Boat Festival. May this holiday bring you happiness, good fortune, and a renewed sense of energy. Thank you for your continued hard work and commitment to our company's success.Best regards,S4A Industrial Co.Limited

After several months of overtime work in the R&D department and dozens of debugging, the S4A private model-TF4 access control unit was officially launched for sale. It was born to further improve the safety of entrances and exits. This product continues S4A's consistent ingenuity design and is in product structure, actual performance, and application experience. New breakthroughs have been made in such areas.If you are interested in this product or any other access control or automatic opener and want to be an exclusive agent, please feel free to leave us a message or call directly.From -S4A Marketing Department

In the past two days, three electromagnetic locks have been processed in a row. The three locks look at the same shape. The circuit board can be divided into three grades, A Grade S4A magnetic lock , B, and C at a glance. No result, C-level this often kills the access control host .Standard qualified magnetic locks (Like S4A brand) generally provide two input voltages of 12V and 24V (the difference between single coil and double coil), which are selected and switched by jumpers. There are several ways to judge the pros and cons of a magnetic lock:(1)   Look at the circuit board(2)   Measuring resistance(3)   Measure the current value after power-on(4)   Insulation value(5)   The verticality of the cut steel sheet(6)   Glue inspection(7)   The distance of the cut steel sheet(8)   No residual magnetism(9)   4007 diode(10) Process treatment of lock body shell(11) High and low pressure(12) Acidity test(13) Finish(14) Lock body electroplating(15) Output line1. Look at the circuit boardThe inferior magnetic lock can be judged from the circuit board. The inferior magnetic lock circuit board has rough printing and very simple layout. It does not use varistors (that is, surge devices, generally there are two), and there is only one set of voltage input.2. Measuring resistanceFirst unplug the 12V and 24V switching jumpers of the magnetic lock (note: no power is required), there are generally 4 binding posts (at the jumper), measure the red and black lines, and the resistance is about 50 ohms. good.3. Measure the current value after power-onAfter the magnetic lock is connected to 12V voltage, the current value is measured, and the one that matches the marked value is better. 280KG (600 lbs) magnetic lock is generally better at 400-450 mA. If it is less than 450 mA, it is not enough to pull; if the voltage is 24V, the marked or actual value should be 200 mA.4. Insulation valueThe insulation value of the lock body of a standard qualified magnetic lock should be infinite, and the specific value should be more than 50 megohms; the specific test position is the cut steel sheet and the lock body output line (any one).5. The verticality of the cut steel sheetIn principle, the cut steel piece should be touched or stained with hands as little as possible. The perpendicularity and parallelism of the qualified magnetic lock cut steel piece should be as standard as possible. The quality of the electroplating of the cut steel sheet depends on whether there are oxidation marks on the cut steel sheet.6. Glue inspectionThe colloid of the magnetic lock should not have bubbles(Reference S4A Magnetic Lock), it should be flat and neat, without cracks, and the angle should be square.7. The distance of the cut steel sheetThe main concern is that the thickness of the cut steel should be 0.35mm. At present, most of the cut steel on the market use 0.5mm cut steel; the tighter the arrangement o...

The Magnetic door holder is a hardware accessory used by every household. It can protect the door leaf and prevent the door leaf from being damaged due to strong collisions. The Magnetic door holder can be divided into wall-mounted and floor mounted from the installation method. Many families will be entangled when choosing: which one is better to choose? Today, S4A will help you analyze it.Understanding Magnetic door holderA magnetic door holder, commonly known as a door bumper, is a device that can hold the door leaf when the door leaf is opened. According to the installation form, the Magnetic door stop is divided into the wall-mounted type and floor-mounted type.A small metal plate is attached to the door and is positioned to come in direct contact with the electromagnet. When energized, the electromagnet will hold onto the metal plate to hold the door open. Mag hold-open devices are connected to the fire alarm system or life safety system.The Magnetic door holder is installed behind the door. When the door is opened, the door is stabilized by its magnetism to prevent it from closing automatically when the wind blows. This is especially suitable for the elderly and children at home, effectively preventing the elderly and children from accidentally locking themselves into the house. inside.The difference between wall-mounted and floor mountedThe function of wall mounted and floor mounted is to prevent the door of the house from touching the wall and damaging the wall, but both wall-mounted and ground-mounted have their own advantages and disadvantages.Wall-mounted1. Under normal circumstances, most households use wall-mounted, which is installed on the wall behind the door, which does not take up space and is more securely fixed.In addition, the wall-mounted does not occupy floor space, has a good decorative effect, does not affect the aesthetics of the home, and is more convenient to use.2. Wall mounted has high requirements on the wall surface. Some owners worry that nailing the door stopper to the wall may cause damage to the wall due to excessive tension. In fact, it is normal to have such a worry.If the wall of the house is made of cement and mixed with a lot of sand, this kind of wall is likely to damage the wall if it is sucked by the wall.Ground-mounted The ground-mounted is installed on the ground, it occupies a small floor area, and the sound insulation effect is better. The distance between the door and the wall is not high, and there is no requirement for the wall.2. When it comes to ground-mounted, it is estimated that some owners feel that ground-mounted is too intrusive, and they are easy to trip when they are not paying attention. When cleaning the room, the ground around the floor-mounted is not easy to clean, and it is easy to rust after a long time of use.The Emergency Door Holder is a powerful "weapon" to protect the wall and door leaf. Choosing a suitable door stopper can prolong the service life of the door...

How to install the L,Z,U bracket of the magnetic lock?Many customers are not sure if their own doors need brackets, or what brackets to choose.After ordering, can they install it themselves?According to the usual communication with customers, we have sorted out the relevant questions of customers, and hope that this article has the answers you want.If you need more detailed information, you can email or call us directly.Email: sales@s4a-access.com  or Call: +86 755 29450011       a. First put the L1 bracket in the Z&L bracket on the position where the lock is installed, and fix it on the door frame or wall with self-tapping screws.       b. Use a hexagonal wrench to lock the lock body on the L1 bracket.       c. Fix the Z2 bracket on the door corresponding to the position of the L1 bracket.       d. Insert the follower iron plate into the three holes of Z1 for false fixation, and then close the door to make the magnet and the follower iron plate fit tightly, and determine the connection position of Z1 and Z2 for the single door magnetic lock(The relative position of Z1 and Z2 can be adjusted according to the thickness of the door)      e. Tighten Z1 and Z2, and then fix the follower iron plate on Z1 with M8*25 hexagon socket head screws (insert the screw, iron plate, washer and rubber washer in sequence).       f. If it is a double door magnetic lock system, two Z&L brackets can be used. Buried (built-in) installation method The buried installation method of the inner door and the outer door are the same. The slot, the lock can be embedded and then the screw can be locked, and the general construction personnel will install the lock when they see the lock.The frame of the aluminum alloy door is generally hollow. For this feature, we have designed two installation methods.      A. Wood lining method: Put a suitable size of wood in the door frame for lining, and then lock the screws. This method is convenient to obtain materials and simple to install. This method is mostly used in actual installations.      B. Using the installation accessories method: This method is to use the accessories (four-hole iron plate + U-shaped iron) provided by us to make the installation easier. Installation Precautions When doing flush installation, make sure that the size of the door stop is slightly larger than the size of the selected lock.  Glass door installation method 1. Installation method of glass door with aluminum alloy (or other materials) framed glass door for embedded installation generally can use FG-600 or UB-600 series magnetic door lock, which is unique to our S4A company and most suitable for installation in glass door The lock on the door, whether your door is inward-opening or outward-opening, double-opening free door can be installed. The installation method is the same as the embedded ...

Most the clients have no idea what is the dynamic and what is the Static reader,and what's the difference, for better to understand, we make a list with information for your reference.Static code analysis is done without executing any of the code,dynamic code analysis relies on studying how the code behaves during execution,Code analysis in itself produces secure code, but other issues, such as changes within the system build, need to also be considered to produce a secure systemWhat is the meaning of dynamic code?Dynamic code analysis is a testing procedure that is part of the software debugging process and used to evaluate a program during real-time execution. It is applied during the development phase.What is the meaning of static code?Static code analysis is a method of debugging by examining source code before a program is run. It's done by analyzing a set of code against a set (or multiple sets) of coding rules. Static code analysis and static analysis are often used interchangeably, along with source code analysis

A magnetic shear lock, also known as an electromagnetic shear lock or maglock, is a security device commonly used in access control systems to secure doors. It consists of two main components: an electromagnet mounted on the door frame and a metal plate attached to the door. When activated, the electromagnet generates a strong magnetic field that holds the metal plate in place, preventing the door from being opened.Here is a detailed description of a magnetic shear lock:Design and Installation: A magnetic shear lock typically features sturdy construction with an electromagnet encased in durable housing. The electromagnet is installed on the door frame, while the metal plate, often made of steel, is fixed to the door. The two components align when the door is closed, allowing the electromagnet to secure the door effectively.Working Principle: When an electric current passes through the electromagnet, it generates a powerful magnetic field. This magnetic field attracts the metal plate, creating a secure bond between the door frame and the door. The magnetic force is strong enough to withstand a significant external force, providing a reliable barrier against unauthorized entry.Control and Activation: Magnetic shear locks are typically controlled by an access control system, which can include keypads, card readers, biometric devices, or centralized control software. When a valid access credential or command is received, the control system activates the magnetic shear lock, allowing the door to be securely locked or unlocked.Advantages of Magnetic Shear Locks:Strength and Security: Magnetic shear locks offer high-strength locking capabilities, providing a robust level of security. The magnetic force between the electromagnet and metal plate is difficult to overcome, making it challenging for unauthorized individuals to force open the door.Fail-Safe Operation: In the event of a power failure, most magnetic shear locks are designed to release automatically, ensuring that occupants can safely exit the premises without being trapped inside. This fail-safe feature enhances safety in emergency situations.Quick Response Time: Magnetic shear locks can be activated and released rapidly, allowing for efficient access control. This is especially beneficial in high-traffic areas or during emergency situations where quick access is crucial.Durability and Low Maintenance: These locks are typically built to withstand heavy use and adverse environmental conditions. With no moving parts, they have a longer lifespan and require minimal maintenance compared to mechanical locks.Versatility: Magnetic shear locks can be used with various door types, including wooden, glass, and metal doors. They are suitable for both interior and exterior applications, offering flexibility in their installation.It's worth noting that while magnetic shear locks provide strong security for access control, they may not be suitable for all applications. Factors such as fire safety regulat...

Dear All S4A Valuable Partners：Please kindly be informed that our offices in Shenzhen for the National Day HolidayHoliday in Oct,2021 from S4AFromToResume backTotal1st,Oct7th,Oct8th,Oct7days offIf you have any emergency or technical questions, please call us directly.Tel: 0086 755 29450011