Our factory has 15 years experience in magnetic lock production.

Whether it is the low-end market, the terminal market, or the high-end market, our company has corresponding magnetic locks to meet your different needs.Of course quality is based on cost. mini Magnetic locks should be identified from various technical indicators. Standard qualified magnetic lock door generally provide two input voltages of 12V and 24V (the difference between single coil and double coil) for time delay magnetic lock, They are selected and switched by jumpers. There are several ways to judge the pros and cons of a magnetic lock:

Here,S4A company's engineers have summarized 15 related knowledge for your reference.

1. Circuit board: The inferior magnetic lock can be judged from the circuit board. The inferior magnetic lock circuit board has rough printing and extremely simple layout. A set of voltage inputs.

2. Measure the resistance: first unplug the 12V and 24V switching jumpers of the magnetic lock (note: no power is required), generally there are 4 binding posts (at the jumper), measure the red and black lines, the resistance is at Preferably around 50 ohms.

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 value 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 output line of the lock body.

5. Perpendicularity of the cut steel sheet: In principle, the cut steel sheet should be touched or stained with hands as little as possible. The perpendicularity and parallelism of the qualified magnetic lock cut steel sheet 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: There should be no air bubbles in the colloid of the magnetic lock, it should be flat and neat, without cracks, and the angle is square.

7. The distance between the cut steel pieces: the main concern is that the thickness of the cut steel pieces should be 0.35mm, which is the best. At present, most of the steel cut pieces on the market use 0.5mm cut steel pieces; the tighter the arrangement of the cut steel pieces on the lock body, the better , Pay attention to observe that there is no glue leakage in the arrangement of the cut steel sheets.

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, and are equipped with protruding rubber pads to play a buffering role. , the lock with anti-residual magnetic device will reduce the pulling force of about 35 kg; if the product of 99.9% pure iron is used, the residual magnetic generation can be basically eliminated without the anti-residual magnetic device, and the pulling force is sufficient.

So a normal version of 280KG EM locks, 600lbs magnetic lock, the normal holding force can be about 240-260KG

9.4007 Diode: It refers to the locks that do not have indicator lights and signal output. Generally, this diode crystal is 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. The positive and negative poles are wrongly connected or the access control machine is impacted.

10. Process treatment of the lock body shell: The lock body shell generally adopts oxidation wire drawing or oxidation sand blasting, especially oxidation sand blasting and fine sand. The wire drawing is neat, the money is sprayed evenly, and the cutting surface of the steel body of the shell is smooth.

11. High and low pressure: Under low pressure, the lock can still work, but the tension is reduced; under high pressure, the lock body becomes hot. At this time, attention should be paid to the temperature rise. If the temperature rise exceeds 20 degrees, it is an inferior product. Get the temperature rise data.

12. Acidity test: Use weak acid to coat the lock body cut steel, the good lock body will be oxidized after 45 minutes, and the poor lock body will be oxidized 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. Smoothness: drop small water droplets on the steel cut-off piece of the lock body to observe whether the flow is smooth and whether it is muddy and watery.

14. Lock body electroplating: Pay attention to the quality of the electroplating at the corners of the lock body. Wrinkles and darkening are not sufficient for the electroplating of the lock body.

15. Output line: The two-core one is a no-signal output electric lock, and the five-core one is a door position detection output.

All in all, a normal electromagnetic lock is produced by our company, and there is no problem in using it for a year.After a year, the holding force will decrease a little bit.But the quality is no problem.

Author: Written by Ms.Juan from S4A INDUSTRIAL CO., LIMITED