Answer / engineer

Red colour is for correction or as built
Green colour for erasing 
Blue colour for addition

Answer / saif

Yellow Highlighter ?
Red color ?
Blue Color ?

give eg of how I/P is used in control loops

0 Answers   CEPC,

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a pressure transmitter with a range of 0 to 2500kpag has a specified accuracy of 0.5 % of span.It is to be calibrated using a comparison gauge to have an accuracy of 0.1% of span.The comparison gauge has a range of 0 to 3000kpag What is the accuracy ratio? is this ratio acceptable?

2 Answers  

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HOW TO CALCULATE ACCURACY OF AN INSTRUMENT. WHICH IS COMPITABLE FOR USE.

0 Answers   ABB, NTPC,

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please can any one tell me clearly about pid tuning i am confusing about this .how to tune pid easly?

0 Answers   HP, Siemens,

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Explain any simple temperature control system.

3 Answers   HGJ, L&T,

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What should be the stanchan Height for installation of Smoke detector & toxic gas detector in field,according to qatar standard

2 Answers  

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Condensation within a sight glass? Would you expect there to be more problems when using a sight glass if there is condensation on the inside or the outside of the glass, and why?

1 Answers  

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Troubleshoot to the device level basic process control systems given the Process and Instrumentation Diagram?

2 Answers   Chettinad, HPCL,

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what is the reset offset and control system in instrumentation

0 Answers   ABB,

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how to tune the closed pid loop?

3 Answers  

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what is type of protocol used in instrument field to marshalling cabinet cabel. what is the differenance between bus cabel and instrument cabel?

1 Answers   Samsung,

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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =

0 Answers  

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