Since the Hall effect sensor, it has won the designer's design imagination, and solid-state devices are generally considered to be more reliable than mechatronics. However, when comparing the reed switch sensor technology to the Hall sensor technology, you can observe some notable advantages of the reed switch sensor.
In the reed sensor, the key component is the reed switch, which was invented by WeSTern Electric in 1940. The other main components are elastic springs and magnets or electromagnets that are opened or closed.
After 60 years, the reed pipe development has been improved to make it more reliable, while improving quality while reducing costs. Thanks to these dramatic improvements, reed switch has become the design of choice in demanding applications where quality, reliability and safety are paramount.
The most compelling application for the quality and reliability of reed sensor is for automated test equipment (Ate). The technology is first class in this type of equipment, and the reed switch is used in reed relays, which are used in IC, ASIC, silicon test equipment and printed test equipment as switches. In these applications, the number of reed switch relays in a test system can reach 20,000.
The failure rate of a relay is set to 50 ppm, so to meet this requirement, the quality of the reed relay is much better than the 50 ppm requirement. So far, I have not heard of an electromechanical device with such a quality level. Similarly, it is equally applicable to some semiconductor devices.
Once the quality test is performed in addition to the initial work, the reed relay needs to perform well during its lifetime. At this point they have proven to outperform all other switching devices. This is because in many cases, ATE works 24 hours a day, 7 days a week, and its cost is the most important. Therefore, the working life of the reed switch requires millions of times.
Another example of a reed switch that facilitates the reed is that it is used as an airbag sensor, in which it passes the time test in harsh safety applications. Reed switch sensors are widely used in many demanding automotive safety devices (such as the height of sensitive brake fluids) and are used in many medical instruments, including cautery devices, medical devices such as pacemakers. On these devices, the reed switch relay isolates small leakage currents.
Comparison between reed sensor and Hall effect sensor In the technology of both the reed switch and the Hall effect sensor, the size is shrinking. However, when the reed switch sensor is compared to a Hall effect sensor (see attached table), some of the advantages of the reed switch can be seen:
1. Hall effect devices are generally low in price, but need to be powered by expensive power circuits. The output signal is also so low, and the amplifier circuit is also added. The final result is that the Hall effect sensor is more expensive than the reed switch sensor.
2. The reed switch has excellent insulation from the input to the output and the insulation resistance of the switch reaches 1015. The result is a leakage current of 10-15A. On the other hand, Hall effect devices have submicron leakage current levels. It is important to insert human probes or pacemakers into medical electronics that do not have any leakage current close to the heart. Microamp or submicron currents can alter the critical electrical dynamism of the heart.
3. The reed sensor is sealed so it can work in almost any environment (eg no effect on humidity).
4. The reed switch contacts have very low on-resistance when turned on, typically down to 50m, while Hall effect sensors may have hundreds of ohms.
5, the reed sensor can directly switch the signal range from a few nanovolts to kilovolts, the current from Fei'an to An, the frequency from DC to 6GHz. The Hall effect device output range is very limited.
6. Reed sensors provide a large range of magnetic sensitivities.
7. Reed sensors are not sensitive to ESD, and ESD can often damage Hall effect sensors.
8. The reed switch sensor can withstand high voltages (minimum rating is 1000V). Hall effect devices require an external circuit rated to 100V.
9. The reed sensor is capable of withstanding a typical test of a 3 foot drop, which is similar to a Hall effect sensor.
10. Because the reed switch sensor has no wear components, the low-level load (less than 5V at 10mA and lower) can work up to a million times. This is equivalent to the number of semiconductor microfabricated devices.
11. The reed switch sensor has no effect on the temperature environment. The typical operating temperature range is from -50. C to +150. C, no special conditions, restrictions or fees. Hall effect sensors have a limited operating temperature range.
There are many good applications for reed pipe products. Some reed switch relays are excellent in designing demanding applications and are top notch in quality, reliability and safety.
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