{"id":1998,"date":"2024-07-31T18:06:59","date_gmt":"2024-07-31T18:06:59","guid":{"rendered":"https:\/\/svestudy.com\/?page_id=1998"},"modified":"2025-05-11T10:55:33","modified_gmt":"2025-05-11T10:55:33","slug":"ame-unit-9-q11","status":"publish","type":"page","link":"https:\/\/svestudy.com\/?page_id=1998","title":{"rendered":"AME Unit 9 Q11"},"content":{"rendered":"\n
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With reference to capacitance probe sensors:
(a) describe, with the aid of a sketch, how a capacitance probe produces an output which can be used to measure the liquid level in a tank.(7)
(b) state TWO different uses of this device on a vessel:(2)
(c) state ONE disadvantage of this type of probe.(1)<\/p>\n\n\n

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Capacitance Probe for Liquid Level Measurement<\/p>\n\t\t\t

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A capacitance probe leverages the principle of capacitance to measure the liquid level in a tank. Capacitance is the ability of a system to store electrical charge. \u00a0<\/a><\/p>\n\n\n\n

1. Capacitance level measurement | Endress+Hauser <\/a><\/a><\/a><\/p>\n\n\n\n

2. Capacitance – Analog Devices <\/a><\/a><\/a><\/p>\n\n\n\n

How it works:<\/h3>\n\n\n\n
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  1. Probe Structure:<\/strong> The probe consists of a conductive rod insulated from the tank wall.<\/li>\n\n\n\n
  2. Capacitance Formation:<\/strong> The probe and the tank wall act as the two plates of a capacitor, with the liquid acting as the dielectric (insulating material) between them. \u00a0 <\/a>1. Measurement of level in a tank using capacitive type level probe – Virtual Labs <\/a><\/a><\/a><\/a>sl-coep.vlabs.ac.in<\/a><\/a><\/li>\n\n\n\n
  3. Capacitance Variation:<\/strong> The capacitance value changes as the liquid level rises or falls. This is because the dielectric constant (ability to store electrical charge) of the liquid differs from that of air or vapor. \u00a0 <\/a>1. Measurement of level in a tank using capacitive type level probe – Virtual Labs <\/a><\/a><\/a><\/a>sl-coep.vlabs.ac.in<\/a><\/a><\/li>\n\n\n\n
  4. Signal Generation:<\/strong> The probe is connected to an electronic circuit that generates an electrical signal proportional to the capacitance.<\/li>\n\n\n\n
  5. Output:<\/strong> The output signal, usually in analog or digital form, represents the liquid level.<\/li>\n<\/ol>\n\n\n\n

    Key Points:<\/h3>\n\n\n\n