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15 ways to judge the quality of a magnetic lock

September 29, 2022

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 .

magnetic lock


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 line


1. Look at the circuit board

The 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.

magnetic lock


2. Measuring resistance

First 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-on

After 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 value

The 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 sheet

In 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 inspection

The 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 sheet

The 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 of the cut steel on the lock body, the better. There should be no glue leakage during the arrangement.


8. No residual magnetism

Generally, the cleats of magnetic locks are made of pure iron, but most of the cleats are 99% pure iron, so they must have the function of removing residual magnetism. They are equipped with protruding rubber pads, which play a buffer role and have anti-residual magnetism devices. The lock will reduce the pulling force of about 35 kg; if the product of 99.9% pure iron is used, the generation of residual magnetism can be basically eliminated without the anti-residual magnetism device, and the pulling force is sufficient.


9. 4007 diode

Especially for locks that do not have indicator lights and signal output, this diode crystal is generally added to the positive and negative poles of the power supply of the lock. This treatment obviously shows that the material of the lock is not good enough, and some protection work is done here to prevent the positive and negative Extremely wrong connection or impact on the access control machine, etc.


10. Process treatment of lock body shell

The lock body shell is generally made of oxidation wire drawing or oxidation sandblasting, especially oxidation sandblasting, fine sand is preferred.

The wire drawing is neat, the money is sprayed evenly, and the cutting surface of the steel body of the shell is flat.

magnetic lock


11. High and low pressure

Under low pressure, the lock can still work, but the pulling force is reduced; under high pressure, the lock body will become hot, and you should pay attention to the temperature rise at this time. If the temperature rise exceeds 20 degrees, it is an inferior product. Generally, the temperature rise data can be obtained within an hour. 


12. Acidity test

Use weak acid to coat the lock body cutting steel sheet, the good lock body will oxidize after 45 minutes, and the poor lock body will oxidize after 15 minutes. In addition, the lock body can be soaked in water, and the one that turns black within 24 hours is an inferior product.


13. Finish

Drop a small drop of water on the steel section of the lock body to observe whether it flows smoothly and whether it is muddy or watery. The smoother one has the best finish.


14. Lock body electroplating

Pay attention to the electroplating quality of the corners of the lock body. Wrinkles and darkening are not enough for the electroplating of the lock body.


15. Output line

The two-core one is an electric lock with no signal output, and the five-core one is with door position detection output.

magnetic lock


At present, the suction strength of the electromagnetic lock is expressed in KG (kg), and the test method is static pressure. The so-called static pressure means that the electromagnetic lock gradually increases the pulling force on the adsorption iron plate after the electromagnetic lock is energized. When the suction force of the electromagnetic lock is exceeded, the adsorption iron plate is instantly pulled away. The data of this pulling force is the pulling force value of the electromagnetic lock. Moreover, the force of the electromagnetic lock and the adsorption iron plate must be face to face and linear pressure (collinear load test), so the suction force of the electromagnetic lock (HoldingForce) is the largest. The adsorption iron plate may be temporarily magnetized due to the magnetic induction of the electromagnet for a long time.

S4A's magnetic lock is a standard qualified product that can meet the above points. If you want more information about S4A, please contact: sales4@s4a-access.com (Rebecca FU )

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  S4A-Security For All.  S4A Industrial Co., Limited, Founded in 2010, We have been dedicating in access control production R&D and sales for 10year till now. With the belief that we do one thing well in a lifetime, our CEO has been in this industry for 15 years. During the past 10 years, our products have been exported to various countries and regions. And 90% of customers come from the recommendations of cooperative customers, and 80% of the turnover comes from cooperative customers in the past 10years.Your business is a plant, we are the gardener, our mission is to water and fertilize the plant, and make it become the towering tree. We attach great importance to the partner's appeal, customer's suggestions, and feedbacks. To strengthen Product quality awareness, client's service awareness. Our clients and S4A are on the same path walking for many years.       S4A's future would be even more brilliant, this is related to all of our staff's working sweat. When you join this team, you will feel an invisible power to drive walk forward. S4A mainly produces a series of security Door Access Control such as:Network Access Controller, Locker board, Electromagnetic lock, Standalone door Controller, Automatic door opener, etcOur team can manufacture products, sell products, and do after-sales.We can create value for you! 1-We put quality and price in top priorityQuality takes great importance for a company's credibility, and buyer's every penny spend must worth it. That is our most basic principle. Our business mainly for wholesale, so we could offer large quantities at competitive prices. During the past 10 years, We work hard to create value for our customers, and with our help, customers have an increasing market share. 99% of the customers who have cooperated with S4A will choose 2nd,3rd, and endless purchasing. because S4A not only controls the product quality very well, but the price is also very reasonable. As you can see, we have hundreds of products, but We do not produce all products. We adopt a portfolio strategy and invest in each factory. Because of the large export volume and the stable cooperation relationship with the factory, we can better control the quality and price of the products. Cooperate with us, you have no worries. In the past 10 years, more than 80% of our customers' sales have increased turnover by 15-20% every year. 2 -We have experienced and professional sales Our sales are not just sold products, we also help you choose products, do market research. Our company's top sales team all have more than 8 years of experience in the access control market, our team loves learning, loves sharing, good at summarizing, and dare to undertake responsibility. Because all of us regard the access control field as a career we love throughout our lives. At S4A, you can get a quick response and flexible support, and you can see our ability to solve problems. get professional guidance and recommendations, you don't have to worry about after-sales at all. Our task is: All emails must be replied within 2 hours at a working time!3-We have experienced and professional engineer S4A is equipped with 6 technical engineers for after-sales. and every year, We take out 20% of the net profit as research and development for new products, We all know Access control system is a kind of product with technical knowledge. When you have headaches such as unable to connect wires, Software compatibility issues or programming device, please remember S4A's after-sales support at any time. Our task is: All technical issues must be solved within 4 hours at a working time!4-Support OEM & ODM  All of our products accept OEM and ODM orders at a reasonable quantity. we help customers to promote their brand. We all know Access control is an increasingly popular industry. Based on past experience, we have found that customers who have just started to become distributors do not have a large number, but want to promote their own brands. For this kind of customer, we will also have a special application to do OEM for him. Because Support is mutual.5. S4A Vision Our Vision is to let all people in the whole world free their hands for keys, whether it is in poor areas or developed cities able to use access control.<
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