The mercury in … The RF signal results in a very low current flow through the dielectric process material in the tank from the probe to the vessel wall. This insulator is also called as dielectric.  A simple capacitor consists of two electrode plate separated by a small thickness of an insulator such as solid, liquid, gas, or vacuum. To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers. b) Measuring change in area of plates 2. Capacitive Transducer Definition: The capacitive transducer is used for measuring the displacement, pressure and other physical quantities. Since the electrode and tank are fixed in place, the distance (d) is constant, capacitance is directly proportional to the level of the material  acting as dielectric. While ultrasonic and radar level sensors can measure your level to give specific feedback to how much of product is in a tank. Which of the following device is used for measuring relative humidity? The dielectric constant of the non-conductive target is the basis for the operation. Question 2 [20 Marks : The capacitance level transducer is used to measure the depth h of liquid in a tank as shown in Figure 1. a) Measuring change in distance between plates Capacitive level transducer is an example of indirect measurement of level. View Answer, 2. This transducer is used to convert the value of displacement or change in pressure in terms of frequency. Sensors are sophisticated devices that are frequently used to detect and respond to electrical or optical signals. b) False In some designs, the metal plates are fixed to either side of the diaphragm; deflection of the diaphragm changes the capacitive coupling between the diaphragm and the metal plates. Value of C depends on dielectric used, area of the plate and also distance between the plates. Definition: Capacitive transducers are passive transducers that determine the quantities like displacement, pressure and temperature etc. Top Suppliers and Manufacturers of Sensors/Detectors/Transducers The same theory is used in a capacitive transducer. The conductive material acts as the ground plate of the capacitor. Corrosive materials like hydrofluoric acid. Which of the following is correct for the capacitive transducer? The capacitive transducer comprises of two parallel metal plates that are separated by the material such as air, which is called as the dielectric material. Capacitive sensors can be used in the same manner as buttons, but they also can function with greater versatility, for example, when implementing a 128-position scroll bar. These sensors are often used as a limit switch, for level detection, flow control, … These transducers have applications in the field of linear and angular displacement with the sensitivity factor. c) Moisture Capacitive sensors can be used to detect metal objects as well as nearly all other materials like powder, liquid or solid materials. Capacitive sensors work by detecting any change in the electric field the sensor can register either touch or proximity, displacement, as well as the level detection of humidity and fluids. 1. Hisham El-Sherif Electronics and Electrical … Advantages of Capacitive level measurement: Capacitance Level Probes are used for measuring level of. a) Capacitive strain gauges The most common one is using it with a touch screen. Non-conductors can be measured by passing the electric field through them to a stationary conductive target behind. © 2011-2020 Sanfoundry. Proximity measurements (Non-contact type measurements): In Proximity level measurement is  the area of the capacitance plates is fixed, but distance between plates varies. a) True 10 x LEDs. a) Capacitive pressure transducer Measurement, Instrumentation & Calibration, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Instrumentation Transducers Questions and Answers – Inductive Transducers, Next - Instrumentation Transducers Questions and Answers – Thermo Electric Transducers, Genetic Engineering Questions and Answers – cDNA Libraries, Polyadenylated RNA and cDNA Synthesis – 1, Genetic Engineering Questions and Answers – cDNA Libraries, Polyadenylated RNA and cDNA Synthesis – 2, Structural Analysis Questions and Answers, Engineering Metrology Questions and Answers, Electromagnetic Theory Questions and Answers, Engineering Physics II Questions and Answers, Basic Electrical Engineering Questions and Answers, Electrical Measurements Questions and Answers, Instrumentation Engineering Questions and Answers, Analytical Instrumentation Questions and Answers, Biomedical Instrumentation Questions and Answers, Instrumentation Transducers Questions and Answers, Instrumentation Transducers Questions and Answers – Smart Sensors, Instrumentation Transducers Questions and Answers – Feedback Pneumatic Loadcell, Instrumentation Transducers Questions and Answers – Magnetostrictive Transducers, Instrumentation Transducers Questions and Answers – Inverse Transducers, Instrumentation Transducers Questions and Answers – Photo Electric Transducers, Instrumentation Transducers Questions and Answers – Heat Flow Balance Systems, Instrumentation Transducers Questions and Answers – Ionization Transducers, Instrumentation Transducers Questions and Answers – Hall Effect Transducers, Instrumentation Transducers Questions and Answers – Process Control Instrumentation. 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