Answer / morsli

HI ,you have to do on first time the derivative action Td at 0 value to eliminanate a derivative action Td =0 and the integral action at maximun means 1/ti=1/maximun =0 and you have to adjust the propotional band to minimun value till you have cycling ,and if u have cycling you adjust the proportional band to twice of cycling value ,you fix the of the proportional band then you adjust integral band same as the proportional ,you decrease the reset value till you have cycling and then you multiply this value on twice ,and you set this integral operational value

how is a displacer type level transmitter calibrated.explain the method?

2 Answers   Emirates,

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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 =

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Tell me about the synchronization panel.

1 Answers  

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Please can anybody help for control valve sizing step by step procedure?

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what are the documentation and instrument identification system used to identify the correct device to be calibrated? name atleast three.

1 Answers  

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what is PM/CM/RCM?

2 Answers   Emco,

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We have ZR22G-100-S-A-E-T-T--E-A/CV/F1 Model Zirconia Oxygen analyser which is Yokogawa make. I kept the analyser in Flue gas path at Air pre heater area. My plant is 7.5MW Biomass power plant. For a particular fuel, Coconut Husk which contains Sodium and Potassium chlorides iam not getting proper reading, Analyser output always Zero. I calibrated the analyser and it is OK. For Other fuels like Wood chips, Cholam waste, DOB, Groundnutshells, Ply wood waste and all iam getting actual percentage of Oxygen. What is the main reason behind this draw back?

2 Answers  

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An equipment is certified for EEX, IA, IIC, T6, what do you under stand by this.

3 Answers   ADMA OPCO,

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What is the GK Value in Flowmeter?

0 Answers   IBPIL, Thermax,

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What is the difference between Error and Offset.

1 Answers  

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

4 Answers  

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A length of steel pipe is used to carry sea water to a desalination plant. An adequate corrosion allowance must be specified and indicated in the piping specification, which affects the _________________________ of the pipe

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