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Views: 34 Author: Site Editor Publish Time: 2023-09-13 Origin: Site
A Reed Switch Sensor is a type of electrical switch that uses an magnetized reed to open or close an electrical circuit. The reed is usually made of iron and is sealed in a glass tube. When the magnet is brought near the reed, it causes the reed to move and either close or open the circuit.
Why is Reed Switch Sensor widely used in stairs?
What are the selection considerations for Reed Switch Sensor?
What are the characteristics of Reed Switch Sensor?
There are many Reed Switch Sensors on the elevator. There are floor sensors, which are leveling switches used for elevator leveling. There are also sensors that can be used quickly, usually bistable switches or travel switches. The elevator needs to be debugged. During the debugging process, the speed change distance needs to be learned. After learning, the speed change distance value is stored in the controller. Then the system will select the corresponding curve to run according to the speed of the elevator and the number of floors. After that, the function of the sensor can be considered as hardware protection, that is, when there is a problem in the software, the purpose of speed change can be achieved through the sensor on the hardware, so as to complete the entire operation process while ensuring the safety of passengers.
Reed Switch Sensor is not suitable for product design with a small error range: the range of AT values is large, and from the perspective of cost, it cannot be guaranteed that the AT values of batch products are the same, and the matching magnets are also different.
Since reed switches are quite fragile, it is easy to break the glass and seal if the lead wires are soldered to a thicker device. If you need to bend the lead-out line, you need to choose the bending point of the lead-out line properly.
1. Cost: The cost of the Hall effect device itself is not high, but it needs electricity and wiring to operate, and because of the low signal output, it often needs to use a signal amplifier, so its cost is lower than that of the reed sensor Quite a bit higher.
2. The reed sensor has a relatively good insulation effect from input to output, and the leakage level is only one hundred billionth of an ampere when the current passing through the sensor is as high as 1015 ohms. Hall-effect devices, on the other hand, have leakage currents of less than microamperes. For some electronic medical devices that will be used in the human body, such as probes or pacemakers, it is very important that there is no leakage of electricity near the heart, because any small amount of current may change the main electrical activity of the heart.
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