CSIM11-L.pH传感器

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1. 什么时候需要清洁或校准pH传感器？

   当测量分散时，可能需要清洁和/或校准，发生漂移，或者存在污垢的物理证据。必须定期监测pH值的测量以检查散射。但是，仅仅因为结果分散不一定表明需要调整。例如，可能存在导致散射的水源的变化。然而，作为传感器年龄，测量值的散射趋于增加。

   要检查PH传感器的性能，请使用它来测量正确范围的缓冲溶液。如果返回的值在指定范围内，则不需要校准传感器。

2. What are the different cable length choices available for Campbell Scientific sensors?

   大多数坎贝尔科学传感器可作为-L提供，表示用户指定的电缆长度。如果传感器被列为-LX模型（其中“x”是其他字符），则该传感器的电缆具有用户指定的长度，但它终止具有唯一系统的特定连接器：

   • An –LC model has a user-specified cable length for connection to an ET107, CS110, or retired Metdata1.
   • An –LQ model has a user-specified cable length for connection to a RAWS-P weather station.

   如果传感器在主型号之后没有-L或其他-LX指定，则传感器具有设定的电缆长度。电缆长度在产品订购信息中的描述字段的末尾列出。例如，034B-ET模型的描述描述了“Met One Wind for Et Station，67英寸电缆。”。产品具有集合电缆长度终止，作为默认尾纤。

   如果电缆用特殊连接器终止用于唯一系统，则型号的末尾指定哪种系统。例如，034B-ET模型将传感器指定为ET107系统的034B。

   • –ET models terminate with the connector for an ET107 weather station.
   • –ETM models terminate with the connector for an ET107 weather station, but they also include a special system mounting, which is often convenient when purchasing a replacement part.
   • –QD models terminate with the connector for a RAWS-F Quick Deployment Station.
   • –PW models terminate with the connector for a PWENC or pre-wired system.
3. Where are the available cable termination options listed for a particular sensor?

   并非每个传感器都有不同的电缆终端选项。可以通过在传感器产品页面的“排序信息”区域中查看两个位置来检查特定传感器的选项：

   • Model number
   • 电缆终止选项列表

   如果在-ET中提供传感器，-ETM，-LC，-LQ或-QD版本，则该选项的可用性反映在传感器型号中。例如，034b作为034b-et，034b-etm，034b-lc，034b-lq和034b-qd提供。

   如果有可用的所有其他电缆终端选项将列在“电缆终止选项”下的传感器产品页面的“订购信息”区域上列出。例如，034B-L风装置具有-CWS，-PT和-PW选项，如034B-L产品页面的排序信息区域所示。

   笔记：随着较新产品的添加到我们的库存中，通常，我们将在单个传感器模型下列出多个电缆终端选项，而不是创建多个型号。例如，HC2S3-L具有用于将其连接到CS110的-C电缆终端选项，而不是提供HC2S3-LC模型。

4. What are the different cable termination options available for Campbell Scientific sensors?

   许多坎贝尔科学传感器可提供不同的电缆终端选项。这些选项包括以下内容：

   • -pt（-pt w / tinned wirs）选项是默认选项，并在产品行上显示其他选项。电缆终止于直接连接到数据记录器的尾纤。
   • In the –C (–C w/ET/CS110 Connector) option, the cable terminates in a connector that attaches to a CS110 Electric Field Meter or an ET-series weather station.
   • In the –CWS (–CWS w/CWS900 Connector) option, the cable terminates in a connector that attaches to a CWS900-series interface. Connection to a CWS900-series interface allows the sensor to be used in a wireless sensor network.
   • In the –PW (–PW w/Pre-Wire Connector) option, the cable terminates in a connector that attaches to a prewired enclosure.
   • In the –RQ (–RQ w/RAWS Connector) option, the cable terminates in a connector that attaches to a RAWS-P Permanent Remote Automated Weather Station.

   笔记：电缆终端选项的可用性因传感器而异。例如，传感器可能没有，两个或多个选项可供选择。如果没有为特定传感器列出所需的选项，请联系Campbell Scientific进行帮助。

5. pH传感器中的参考电极如何被污染？

   A reference electrode can become contaminated when poisoning ions such as lead, iron, chrome, cyanide, or sulfide enter the reference electrode and react either with the silver wire or with the electrolyte solution.

   在完全溶解硼氯涂层之前，污染可能不会变得显而易见，并且来自参比电极的电电位大大变化。如果发生这种情况，则必须更换参考电极。

6. pH传感器如何校准？

   应遵循特定pH传感器的使用说明书中列出的推荐校准方法，以保证最佳效果。必须正确执行校准以确保准确和可重复的测量。在执行校准之前，应清洁pH传感器。

   Calibration is commonly done using a known-value pH solution called a buffer. The buffer solution is formulated to resist pH changes caused by external contaminants. However, the pH of the buffer solution changes as the temperature changes. To compensate for this, manufacturers list the pH of the buffer solution at various temperatures on the buffer solution’s bottle so that the correct value for calibration is selected.

   The most common calibration method is a two-point calibration using two buffer solutions. Each buffer solution has known and accurate pH values at different temperatures. The buffers used should be based on the normal measurement range that the pH sensor operates in for the application. One buffer solution should have a 7.0 pH. The second buffer solution should have a pH that is near the expected pH value of the sample solution.

7. Why is silver used for the wire in the reference electrode of a pH sensor?

   Silver is the best electrical conductor of all the metals because it has the lowest electrical resistance. The silver wire, coated in silver chloride, is relatively insensitive to changes in temperature.

8. 什么是多点校准，何时在pH传感器上完成？

   如果使用单个pH传感器测量碱性和酸性样品溶液，则使用三种缓冲溶液完成多点校准。新万博2019最新活动啊如在两点校准中，第一缓冲溶液具有7.0 pH。第二缓冲溶液应在pH值接近酸性或碱性样品溶液，第三缓冲溶液应在pH值中接近另一个。