01___Introduction2 - MAD 413 Instrumentation & Control...

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Lecture Notes by Dr. E.Caner ORHAN MAD 413 MAD 413 by by Dr. E. Caner ORHAN Dr. E. Caner ORHAN Hacettepe University Hacettepe University Department of Mining Engineering Department of Mining Engineering Introduction Introduction
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2 Lecture Notes by Dr. E.Caner ORHAN Introduction Process control , is the automatic control of an output variable by sensing the amplitude of the output parameter from the process and comparing it to the desired or set level and feeding an error signal back to control an input varible.
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3 Lecture Notes by Dr. E.Caner ORHAN Introduction Process control; (a) shows the manual control of a simple heat exchanger process loop, (b) automatic control of a heat exchanger process loop.
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4 Lecture Notes by Dr. E.Caner ORHAN Introduction Block diagram of a process control loop.
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5 Lecture Notes by Dr. E.Caner ORHAN Definitions Feedback loop, is the signal path from the output back to the input to correct for any variation between the output level from the set level. In other words,the output of a process is being continually monitored, the error between the set point and the output parameter is determined, and a correction signal is then sent back to one of the process inputs to correct for changes in the measured output parameter.
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6 Lecture Notes by Dr. E.Caner ORHAN Definitions Controlled or measured variable, is the monitored output variable from a process. The value of the monitored output parameter is normally held within tight given limits. Manipulated variable, is the input variable or parameter to a process that is varied by a control signal from the processor to an actuator. By changing the input variable the value of the measured variable can be controlled.
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7 Lecture Notes by Dr. E.Caner ORHAN Definitions Set point, is the desired value of the output parameter or variable being monitored by a sensor. Any deviation from this value will generate an error signal. Instrument, is the name of any of the various device types for indicating or measuring physical quantities or conditions, performance, position, direction, and the like.
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8 Lecture Notes by Dr. E.Caner ORHAN Definitions Sensors, are devices that can detect physical variables, such as temperature, light intensity, or motion, and have the ability to give a measurable output that varies in relation to the amplitude of the physical variable. The human body has sensors in the fingers that can detect surface roughness, temperature, and force. A thermometer is a good example of a line-of-sight sensor, in that it will give an accurate visual indication of temperature. In other sensors such as a diaphragm pressure sensor, a strain transducer may be required to convert the deformation of the diaphragm into an electrical or pneumatic signal before it can be measured.
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This note was uploaded on 12/27/2009 for the course MINING ENG MAD 413 taught by Professor Erencanerorhan during the Fall '09 term at Hacettepe Üniversitesi.

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01___Introduction2 - MAD 413 Instrumentation & Control...

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