Sensor poisons are chemicals which inhibit the sensors from carrying out their function properly. Even though sensors in portable gas detectors are designed to be exposed to gases, including those that are corrosive and toxic, or explosive, they are still susceptible to inhibition by sensor poisons or inhibitors. These can be in the form of ordinary lubricant or cleaning chemicals, or specialized products, depending on the type of sensor.
Among those which are affected the most is the catalytic bead LEL sensor, which is standard in gas detection for a variety of applications. This is one reason that knowing what can act as a sensor poison is so important, allowing the user to understand if the monitor is working as designed or allowing dangerous exposure to flammable gases without setting off an alarm.
A催化珠莱尔传感器是该类别中最常用的传感器之一，但其检测机理决定了其易受传感器毒物和抑制剂的脆弱性。从根本上讲，该传感器点燃了暴露于珠子的气体，并检测到导致的温度变化，以将其转换为屏幕上显示的气体水平读数。
抑制剂或毒药的存在可能会减少或预防气体燃烧，因此读数显示低于实际值或不可能读取。毒物和抑制剂的作用均以相同的方式起作用，但以不同的方式影响传感器，并以不同的方式引入。
传感器中毒是如何发生的
Sensor poisons通常遇到的包括基于硅酮的产品，润滑剂，各种气体，硫和铅化合物的添加剂。这些动作的方式如下：一旦仪器打开，催化珠就开始变热，并加热与之接触的任何毒药。毒药几乎立刻融化，并不可逆转地覆盖珠表面。
This demands sensor replacement if the device is to work, since the encapsulated bead can no longer burn the flammable gas that comes into contact with its surface. Thus, it does not give a readout. The danger lies when the instrument has not been regularly calibrated or bump tested as recommended, because the lack of readout is no longer reliable.
用户无法再判断检测器是否正常工作，并验证环境中的可燃气体，或者由于传感器已中毒而无法运行。因此，任何怀疑珠子中毒都应立即采取行动来校准传感器以确认其状况。
只要传感器读取校准气体，该传感器可以进行适当的读数，它可以检测到地面上的气体，但是如果在应用校准气体后未提供读数，则传感器失败了校准测试。
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Some of the most common poisons are silicone-based products, lubricants, gas additives, lead, and sulfur compounds.
Action to be Taken if Sensor Poisoning is Suspected
Inhibitors may affect the sensor’s effectiveness, though less completely compared to sensor poisons. One example is the presence of both inhibitors and combustible gases in the same mixture. The catalytic bead in the sensor can now no longer detect the gas.
传感器抑制剂的作用是增加检测水平，并降低传感器的工作寿命。但是，如果对传感器进行了校准并测试了凸起，则可能仍可以可接受的限制。经常遇到的抑制剂包括卤化化合物。
暴露于传感器抑制剂后，应立即对仪器进行校准，以确认传感器仍然可以工作。在燃烧在催化珠表面的校准缸引入的易燃气体之后，粘在珠上的抑制剂也被部分燃烧。但是，如果传感器反复接触抑制剂或大量抑制剂，则可能无法挽救它，并且校准可能会失败。
有时，立即认识到传感器暴露于毒药或抑制剂中，但也可能会丢失。例如，几种润滑化合物或基于硅树脂的化学物质以喷雾形式提供，该化合物覆盖了特定目标区域之外的许多区域。因此，如果将个人气体检测器放置在其接近度中，则可以完全或部分覆盖喷雾。
Moreover, these products are often slow to dry, and they give off vapors and chemicals as they dry. Another area of concern is the manner of storage, for while a gas detector is stored with other chemicals, in a locker or tool box, for instance, it may be exposed to a poison or inhibitor, even if it is protected from such exposure during the period of active use.
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如果有人认为LEL传感器可能已中毒，则应立即对其进行校准，以确保其处于工作状态。
如何处理传感器中毒
由于本文描述了一些常见来源sensor poisoning or inhibition, it may be understood that a gas detector should be calibrated, and bump tested each day, as well as repeating the calibration on any suspicion of sensor contact with such substances.
This will help you maintain the good condition of the instrument, so that it detects gas as it is meant to do. However, if calibration of an instrument whose sensor has been possibly poisoned or inhibited results in a failed result, it means the instrument should be serviced before being used for gas detection again.
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