why the positioner output is 3-15psi

5 Answers  

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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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what is difference b/w the solinoid volve and autodrain?

3 Answers  

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Instrumentation Safe Guarding test. How to determine the interval time of the test. eg:Halfyearly,Every year,Every three years etc.

0 Answers  

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What is the DIfferences between SMART transmitters and PROFIBUS DP/PA Transmitters?

4 Answers  

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What is the SCAN time of a DCS/PLC? What is the typical value for scan time of DCS and PLC?

6 Answers   Essar, Gasco, Siemens,

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Drum level tx with GP4 with zero elevation:7300mmh20 on HP and 8050mmh2o on LP as range but on commissioning the tx readiing is max,Why this reading?

0 Answers  

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If I installed wrong directions orifice plate then what showing value d.p transmitter?

2 Answers   Forbes, STS,

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What is the absolute temperature

2 Answers  

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In RS 500 SLC 5/03 input change one module card to another card, plz. give steps clearly.

0 Answers   BHL,

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How we can check the 2 wire proxy switch? & how it is connected to DI MODULE OF PLC?

0 Answers  

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how to measure level under ground tank ? which type of transmitter very accuracy ?

3 Answers   Biocon,

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