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Magnetic locks should be identified from various technical specifications. Standard qualified magnetic locks generally provide 12V and 24V input voltages (the difference between a single coil and a double coil). They are selected and switched by jumpers. To determine the merits of a magnetic lock, there are several ways:
1. Circuit board: inferior magnetic lock can be judged from the circuit board, poor quality magnetic lock circuit board has rough printing and layout is very simple, no varistor is used (that is, the sine wave, there are generally two), and only one group Voltage input.
2. Resistance measurement: first unplug the 12V and 24V switching jumpers of the magnetic lock (Note: no power), generally have 4 terminals (jumper), measure the red and black wires, the resistance is 50 ohms The best is about.
3. After the power is measured, the current value is measured: after the magnetic force is applied to the 12V voltage, the current value is measured, which is in accordance with the marked value. A magnetic lock of 280KG (600 lbs.) is generally preferred at 400-450 mAh. If it is less than 450 mA, it will not be able to pull. If 24 V is applied, its nominal value or actual value should be 200 mA.
4. Insulation value: The standard qualified magnetic lock should have an insulative value of infinity, and the specific value should be above 50 megaohms; the specific test position is the steel cut piece and the lock body output line.
5. The verticality of the steel cutting piece: In principle, the steel cutting piece should be minimized in touch or stained by hand. The perpendicularity and parallelism of the qualified magnetic lock cutting steel piece should be as standard as possible. The quality of the steel plate plating should be based on whether or not there are traces of oxidation on the steel plate.
6. Filling glue inspection: magnetic lock colloids can not appear bubbles, should be flat and tidy, no cracks, angle square.
7. Steel plate distance: The main concern is that the thickness of the steel plate should be 0.35mm, which is the best. Currently, more than 0.5mm steel plates are used in the market. The tighter the steel plate on the lock body, the better. Observe no seepage in the arrangement of the cut-off piece.
8. No residual magnetic: the general magnetic lock is made of pure iron lock, but most of the lock is 99% pure iron, so it must have to residual magnetic function, with a protruding rubber pad, play a buffer role, there is The lock of the anti-remnant magnetic device will reduce the pulling force of about 35 kilograms; if the 99.9% pure iron product is used, the generation of residual magnetism can be basically eliminated without the residual magnetic device, and the pull force is sufficient.
9.4007 Diode: Specifically, the locks that do not have indicator lights and signal output, generally add this diode crystal at the positive and negative poles of the power supply of the lock. This treatment obviously reveals the material of the lock but does not pass, but some protection work done here prevents Positive and negative poles are connected wrongly or impacted the access control machine.
10. Lock body shell process: Lock body shell is generally used oxidation drawing or oxidation sandblasting, especially oxidation sandblasting, fine sand is excellent. The drawing is neat and the bills are evenly distributed, and the cutting surface of the shell steel body is smooth.
11. High and low pressure: When the pressure is low, the lock can still work, but the pull force is reduced; when the pressure is high, the lock will become hot, and at this time, the temperature rise should be noted. If the temperature rises by more than 20 degrees, it is a bad product, generally it can be obtained within one hour. Temperature rise data.
12. Acidity test: Apply a weak acid to the steel plate on the lock body. A good lock will not oxidize until 45 minutes later. The poor oxidation usually occurs within 15 minutes. In addition, the lock body can be soaked in water, and it is a bad thing to blacken within 24 hours.
13. Smoothness: Drop a small drop of water on the lock steel plate to observe whether the flow is smooth, whether it is dragging mud or water, and the smoothness of the smooth water is excellent.
14. Lock body plating: pay attention to the quality of the electroplating of the position of the lock body at the corners of the watch body. Wrinkles and darkening are the key to plating.
15. Output line: Two cores are no signal output locks, and five cores are gated detection outputs.
1. Circuit board: inferior magnetic lock can be judged from the circuit board, poor quality magnetic lock circuit board has rough printing and layout is very simple, no varistor is used (that is, the sine wave, there are generally two), and only one group Voltage input.
2. Resistance measurement: first unplug the 12V and 24V switching jumpers of the magnetic lock (Note: no power), generally have 4 terminals (jumper), measure the red and black wires, the resistance is 50 ohms The best is about.
3. After the power is measured, the current value is measured: after the magnetic force is applied to the 12V voltage, the current value is measured, which is in accordance with the marked value. A magnetic lock of 280KG (600 lbs.) is generally preferred at 400-450 mAh. If it is less than 450 mA, it will not be able to pull. If 24 V is applied, its nominal value or actual value should be 200 mA.
4. Insulation value: The standard qualified magnetic lock should have an insulative value of infinity, and the specific value should be above 50 megaohms; the specific test position is the steel cut piece and the lock body output line.
5. The verticality of the steel cutting piece: In principle, the steel cutting piece should be minimized in touch or stained by hand. The perpendicularity and parallelism of the qualified magnetic lock cutting steel piece should be as standard as possible. The quality of the steel plate plating should be based on whether or not there are traces of oxidation on the steel plate.
6. Filling glue inspection: magnetic lock colloids can not appear bubbles, should be flat and tidy, no cracks, angle square.
7. Steel plate distance: The main concern is that the thickness of the steel plate should be 0.35mm, which is the best. Currently, more than 0.5mm steel plates are used in the market. The tighter the steel plate on the lock body, the better. Observe no seepage in the arrangement of the cut-off piece.
8. No residual magnetic: the general magnetic lock is made of pure iron lock, but most of the lock is 99% pure iron, so it must have to residual magnetic function, with a protruding rubber pad, play a buffer role, there is The lock of the anti-remnant magnetic device will reduce the pulling force of about 35 kilograms; if the 99.9% pure iron product is used, the generation of residual magnetism can be basically eliminated without the residual magnetic device, and the pull force is sufficient.
9.4007 Diode: Specifically, the locks that do not have indicator lights and signal output, generally add this diode crystal at the positive and negative poles of the power supply of the lock. This treatment obviously reveals the material of the lock but does not pass, but some protection work done here prevents Positive and negative poles are connected wrongly or impacted the access control machine.
10. Lock body shell process: Lock body shell is generally used oxidation drawing or oxidation sandblasting, especially oxidation sandblasting, fine sand is excellent. The drawing is neat and the bills are evenly distributed, and the cutting surface of the shell steel body is smooth.
11. High and low pressure: When the pressure is low, the lock can still work, but the pull force is reduced; when the pressure is high, the lock will become hot, and at this time, the temperature rise should be noted. If the temperature rises by more than 20 degrees, it is a bad product, generally it can be obtained within one hour. Temperature rise data.
12. Acidity test: Apply a weak acid to the steel plate on the lock body. A good lock will not oxidize until 45 minutes later. The poor oxidation usually occurs within 15 minutes. In addition, the lock body can be soaked in water, and it is a bad thing to blacken within 24 hours.
13. Smoothness: Drop a small drop of water on the lock steel plate to observe whether the flow is smooth, whether it is dragging mud or water, and the smoothness of the smooth water is excellent.
14. Lock body plating: pay attention to the quality of the electroplating of the position of the lock body at the corners of the watch body. Wrinkles and darkening are the key to plating.
15. Output line: Two cores are no signal output locks, and five cores are gated detection outputs.