Sensors bellows type

Wheel-speed sensors are available with or without (direct connected sensors) cable. Cable routing in the car is important and many types of sensor configuration (cable layout) are possible. Grommets and clips can fix the cable to the car body. Expansion bellows of plastic protect the cable from damage. Fig. 7.9.12 shows a complete WSS consisting of sensor head, connector, grommets, clips, and expansion bellows. The fixture to the car body with clips and grommets is shown in Fig. 7.9.13. 

Measuring instruments or sensors for example, thermocouples (for temperature), bellows, or diaphragms (for pressure or liquid level), orifice plates (for flow), gas chromatographs or various types of spectroscopic analyzers (for composition), and so on. 

Control loop design uses the five elements of the control loop. The one area that changes consistently is the first primary elements and sensors. Pressure control loops use devices to detect pressure changes. These primary elements are typically expansion-type devices. Primary pressure elements include bourdon, helical, spiral, bellows, pressure capsule, and diaphragm. Figure 8-3 shows a pressure transmitter, controller, transducer, and control valve. 

Other types of these gauges include the twist tube, spiral tube, and helical tube. Diaphragm and bellows gauges are two other types of pressure sensor that were developed later. For more details on Bourdon tube materials and design, refer to Giacobbe and Bounds [1], Goitein [2], and Considine [3]. 

---