Tugas 1 instrumentasi terms of instrumentation


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Tugas 1 instrumentasi terms of instrumentation

  1. 1. Nama : Adi SetianaNim/Kelas : 111611002/2A-D3Teknik Refrigerasi dan Tata Udara
  2. 2.  Accuracy : The difference between a measurement reading and the true value of that measurement. Precision : The degree to which an instrument will repeat the same measurement over a period of time. Precision is the ability to produce the same result from the repeated measurement and identical measuring. accuracy measure is the amount of random error. Range : The limit of measurement values that an instrument is capable of reading. The dimension being measured must fit inside this range. Subdivision
  3. 3.  Error : The amount of deviation from a standard or specification. Errors should be eliminated in the measuring process. Hysteresis : The delay between the action and reaction of a measuring instrument. Hysteresis is the amount of error that results when this action occurs. Stability : The ability of a measuring instrument to retain its calibration over a long period of time. Stability determines an instruments consistency over time. sensitivity is the smallest change in a measurement that an instrument is capable of detect
  4. 4.  Repeatability : The ability to obtain consistent results when measuring the same part with the same measuring instrument. Resolution : The smallest change in a measured value that the instrument can detect. Resolution is also known as sensitivity. Thermocouple : A thermocouple consists of two conductors of different materials (usually metal alloys) that produce a voltage in the vicinity of the point where the two conductors are in contact. Thermocouples are a widely used type of temperature sensor. A thermocouple is a sensor for measuring temperature. It consists of two dissimilar metals, joined together at one end. When the junction of the two metals is heated or cooled a voltage is produced that can be correlated back to the temperature.
  5. 5.  Subdivision is an area or part of something which is itself a part of something larger. Subdivision in measurement system is an units smaller than other units in the same process variable RTD is temperature detectorare used to measure temperature by correlsting the resistance of the RTD elements with the temperature. RTD elements is made by a pure material. Whose resistance at various temperature has been documnented. Common RTD sensingelements constructed of a platinum copper nickel has be unique and repeatableand predictable resistance VS temperatur relationship and operating temperatur range. a pressure transmitter helps to accomplish two specific goals. First, pressure instruments monitor the amount of pressure applied to a part of the process that is required in order to achieve the desired result. a pressure transmitter may be used to make sure that no machinery is building up pressure that is beyond levels that are considered safe for the operators. the pressure transmitter alerts the operator, who can take steps to shut down the machinery and thus avert an industrial accident. The process of using a computer to collect data through sensors, analyze the data and save and output the results of the collection and analysis. Data logging also implies the control of how the computer collects and analyzes the data. Data logging collect information faster than a human can possibly collect the information and in cases where acc data loggers is the ability to automatically collect data on a 24-hour basis
  6. 6.  Definition of Valve Mechanical or electromechanical device by which the flow of a gas, liquid, slurry, or loose dry material can be started, stopped, diverted, and/or regulated. The type of valve : A. Hidraulic Valve B. Pneumatic Valve C. Manual Valve D. Selenoid Valve E. Motor Valve (basic valve type) 1. Isolation valves 2. Switching valves 3. Control valves
  7. 7.  ADC & DAC Analog to digital converter ( ADC ) is a devices that uses sa,pling to convert a continuos quantity to a discrete time representation in digitak form. ADC may also on isolated measurement such as an electronic devices that converts an input analog voltage or current to a digital number proportionalto the magnitude of the voltage or current, the digital output is binary number. Digital Analog converter is a device that convert a digital code to an analog signal. Digital is binary analog is voltage, current, or electrice charge. They performs the reverse operation. DAC is needed for signal to be recognize by human sense or other nono digital. DAC can degrade a signal. So conversion signal are normally choosen, so that the errors negligible. A DAC are often used to convert finite precisiontime series data to a continually varying physical signal.