Thermocouple type B

The noble metal thermocouples, Types B, R, and S, are all platinum or platinum-rhodium thermocouples and hence share many of the same characteristics. Metallic vapor diffusion at high temperatures can readily change the platinum wire calibration, hence platinum wires should only be used inside a nonmetallic sheath such as high-purity alumina. 

In several renewable energy processes, including the concentrating solar collectors, boilers, and combustion systems, the accurate measurement and control of high temperatures are required. These (over 1,000°C) temperatures are most often detected by thermocouples (types B, C, R, and S) and by optical and IR-radiation pyrometers. These devices are only briefly mentioned here, because they will be discussed in detail later. Here, the emphasis will be on some of the other high-temperature detectors such as sonic and ultrasonic sensors. 

Temperature uniformity within the reactor is one of the key parameters to be precisely controlled for CVD processes. For thin film deposition on the surface of silicon wafers, multizone (up to five zones) resistively heated furnaces are designed to enable a uniform temperature field for the deposition of the thin film, as shown in Figure 3.21. Several kinds of thermocouples (Types B, K, R and S) are available for CVD systems to measure temperatures. The features of these thermocouples are hsted in Table 3.5. Because the CVD processing atmosphere... 

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See also in sourсe #XX -- [ ]

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