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传感器

霍尔,干簧或emr 传感器受EDI/RFI影响吗?

霍尔传感器受EDI和 RFI 影响,需加以防护。干簧和emr 传感器不受 EDI或RFI影响。

霍尔,干簧或emr 传感器密封吗?

干簧传感器是唯一密封的传感器。

霍尔,干簧或emr传感器的运行时间是多久?

一般霍尔传感器的运行时间是5 µs, 干簧传感器是 100µs emr 可达10 ms。

霍尔,干簧或emr传感器的输出电压范围是多少?

霍尔传感器不能直接切换电压。干簧和emr 传感器可直接切换电压高达1000V。

霍尔,干簧或emr 传感器可直接切换多大功率?

霍尔传感器可供应微瓦信号,干簧和emr 传感器可直接切换高达100w。

霍尔,干簧或emr 传感器可否直接切换?

仅干簧和emr 传感器可直接切换。

霍尔,干簧或emr 传感器磁滞是否可调?

干簧传感器可调整磁滞从35%到95%。霍尔和emr 传感器有固定磁滞。

霍尔,干簧或emr 传感器需要外部电路吗?

是的。仅霍尔传感器需要斩波电路和驱动。

霍尔,干簧或emr 传感器对输入极性敏感吗?

仅霍尔传感器对输入极性敏感。

霍尔,干簧或EMR 传感器是否需要外加电流?

仅霍尔传感器正常运行时需要外加电流。

霍尔传感器需要额外电路吗?

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.

什么是霍尔效应?

A voltage is produced on a semiconductor material when in the presence of a magnetic field.  The voltage is proportional to the strength of the magnetic field.

霍尔,干簧或emr 传感器的输出绝缘强度是多少?

霍尔传感器的绝缘强度小于10V,emr典型的是250 V,和干簧传感器的绝缘强度可以高达5000V。

霍尔,干簧或emr 传感器的输出电容是多少?

霍尔传感器输出电容通常是100pf,干簧传感器只有0.2pf,和EMRS通常是20pf。

霍尔,干簧或emr 传感器的释放时间是多少?

霍尔传感器的释放时间通常为5μs,干簧管传感器为20μs和 emr  5毫秒。

霍尔,干簧或emr传感器多大电流可直接切换?

霍尔传感器不能切换任何输出电流,干簧管传感器和emr 通常可以直接切换高达2 A。

霍尔,干簧或emr 传感器的输出电阻是多少?

通常霍尔传感器超过200欧姆,干簧和EMR传感器通常50毫欧。

输出极性灵敏度对霍尔,干簧或emr 传感器重要吗?

是的。输出极性仅对霍尔传感器的正常运行起关键作用。

电流10-50毫安,切换5-15V , 我该选择哪款干簧产品?

使用ORD228,ORD211铱,或ORD311。

电流10-250毫安,切换15-35V , 我该选择哪款干簧产品?

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

低电压电流切换使用哪种干簧开关?

小型机电继电器不适合低电压和低电流切换。机电继电器需要强大的电压和/或电流来打破任何薄膜堆积。正是这种薄膜堆积不允许极低的电压和电流通过触点。干簧开关显然是最佳的解决方案。使用镀钌触点或铱触点是这些低电负载的最佳材料。

什么时候使用真空干簧开关?

切换和击穿电压达到250V及以上最佳使用真空干簧开关。在电流不太高的情况下,ORD2210V可以有效地达到4000V。电压高于4000V时,建议使用密封干簧开关。

施加多少电压干簧管会打开?

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.

什么是负载信号?

Reed switches whether they are used in sensors or relays all will be asked to switch some load.  Generally there are two aspects to this load.

  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.

我怎么选择干簧管呢?

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. For switching applications from 50 Volts to 200 volts 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. For higher voltages above 200 volts  up to 4000 volts at relatively low current use the  OKI ORD2210V.
  9. For voltages above 1000 volts up to 10,000 volts with higher currents use the Hermetic vacuum switches.  This represents a start.  One could write a book on this subject.  Best to find out the exact customer load and run a life test with a few or several reed switches to make the final determination.
磁铁与干簧管能转换为温度传感器吗?

A magnet and reed switch can be turned into a temperature sensor by using a magnet that has a certain curie temperature for the temperature you want to sense.  When that curie temperature is reached the magnet loses its magnetic properties whereby the reed switch contacts open.  When the temperature drops below the curie temperature, the reed contacts will close.

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