传感器

霍尔传感器受到EDI和RFI的影响，必须保护它们。簧片传感器和EMRS不受EDI或RFI的影响。

The reed sensor is the only sensor that is hermetically sealed.

The operate time for a hall sensor is typically 5 µs, a reed sensor is 100µs and the emr is up to 10 ms.

Hall sensors cannot switch any voltage directly. Reed and emr sensors can switch up to 1000 volts directly.

霍尔传感器提供微型电平信号，簧片和EMR传感器直接可以切换到100瓦。

Only a reed and emr sensor can be switched directly.

Reed sensors can adjust the hysteresis from 35% to 95%. Hall and EMR sensors have fixed hysteresis.

Yes – chopper circuits and drivers are required for the hall sensors only.

只有霍尔传感器对输入极性敏感。

A current is required for proper operation only on the Hall sensor.

Yes, they only supply a small milli-volt signal in the presence of a magnetic field. The signal needs to be amplified and then fed into a switching circuit.

在存在磁场时，在半导体材料上产生电压。电压与磁场的强度成比例。

霍尔传感器电介质强度小于10伏，对于EMRS，其通常为250 VRMS，簧片传感器介电强度可达5000伏。

The output capacitance for a Hall sensor is typically 100pf, a reed sensor is only 0.2 pico-farads, and emrs are typically 20 pico-farads.

The release time for a Hall sensor is typiclly 5µs, reed sensor 20µs and the emr 5 ms.

霍尔传感器无法切换​​任何输出电流，簧片传感器和EMR通常可以直接切换到2个放大器。

霍尔传感器通常为200+欧姆，簧片和EMR传感器通常为50毫升。

是输出极性对于仅使用大厅传感器的正确切换操作至关重要。

Use ORD228, the ORD211 iridium, or the ORD311.

For a sensor use the ORD228 with iridium or the ORD2210 for a relay.

小型机电继电器不利于切换低电压和电流。机电继电器需要具有余性和/或电流以破坏任何胶片堆积。这是此电影构建，不会允许非常低的电压和电流通过联系人。簧片开关显然是最好的。使用溅射的钌触点或铱触点是这些低水平负载的最佳材料。

使用真空簧片开关最好地完成250伏特及以上的开关和断开电压。只要电流水平不太高，可以有效地完成高达4000伏。超过4000伏使用密封开关。

Miniature reed switches less than 20 mm (0.80 inches) glass length can effectively break up to 250 Volts. This depends on the pull-in AT (mT) used. The higher the better. Reed switches less than 10 mm will shrink this value to around 150 volts. Minimizing the current flow at the time of opening will improve this value.

簧片切换它们是否用于传感器或继电器，所有都将被要求切换一些负载。通常有两个载荷有两个方面。

1. Its steady state load
2. Is the actual switching taking place during the first 50 nanoseconds. This is also called the signature of the load.

This signature takes into consideration not only the steady state load but also any transient voltages or current that may be present during the first 50 nanoseconds. These transients may be from stray capacitance, inductance in the line and/or common mode voltages. From a reed switch designer standpoint, the signature is all there is. The most important time during the switching of a load is that first 50 nanoseconds. That is when all the damage to the contacts with occur if you are switching the contacts ‘hot’. If a customer is having a problem with early failures, this is the first place to look. Equally important and not to be overlooked is what voltage and current is actually being broken when the contacts open. Any healthy voltage and/or current present will chew up the contacts rapidly leading to sticking reed contacts.

There are several key factors:

1. You need to have an idea of the required load. What voltage and current is being switched at the time of closure for the first 50 nanoseconds?
2. How many operations will be required during the life of the product?
3. What are the size requirements? How much room is needed?
4. How will the product be mounted? Surface mount, thru hole, etc.
5. For long life and low levels, use a ruthenium or an iridium sputtered/plated switch.
6. 切换应用程序从50伏到200签证官lts use the Philips/Coto/Comus sputtered ruthenium switch.
7. For switching currents 25 ma to 1 amp, the KOFU thickly plated rhodium is good along with our KSK-1A35.
8. 对于高于200伏的更高电压，在相对较低的电流上高达4000伏，请使用OKI ORD2210V。
9. 对于高于1000伏的电压，高达10,000伏具有更高电流的电压，使用密封真空开关。这代表了一个开始。人们可以在这个主题上写一本书。最好找出确切的客户负载并使用几个或几个簧片开关运行寿命测试，以进行最终确定。

磁铁和簧片开关可以通过使用具有您想要感测的温度的磁铁来转换为温度传感器。当达到该居里温度时，磁铁失去其磁性，从而簧片开关接触打开。当温度降至居里温度以下时，簧片触点将关闭。