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IF TX SHOWS SLOW RESPONSE, WHILE A CLOSE LOOP AND WHEN WE PUT THE CONTROLLER ON MANUAL THE PROBLEM RECTIFIED, SO WE CAN SAY THE PROBLEM IS IN
1 3880why we use cascade control and feed foreword control in 3 element control of boiler drum ?what is feed forward and cascade control system ?
2271why we use cascade control and feed forward control in 3 element drum level control measurement of steam drum .what is cascade and feed forward control system ?give example .
2937Post New Instrumentation Questions
Which are all the commonly used Bordon tubes in the pressure gauges. Do any one use ASTM A 312 tubes for this purpose?
draw the block diagram of a level transmitter ?
what is the electrical operation procedure for switching on 27.6MVA electric furnace.
What is the difference between conductive lined pipe and conductive unlined pipe? Why do we see that?
Explain working principle of lvdt?
what is 24vdc live and dry supply
How would you choose differential range?
I am using 971 Enraf radar level transmitter for LPG tanks ,the tank side indicator gives the error code 999999999FL can any body give me any diagnostic for this issue?
Can Any body tell me how to check Modbus Settings in ER300N L&T trivector meter?
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 =
What pressure results for a flow transmitter of range 0- 180t/h in the dcs and 0-301mbar in the field using square root extraction. Kindly also suggest formulae for the percentages 0,25,50,75,100?
What are the types of control valves available
What is stripper & spilitter ? Diffrence in this.?
How to do gas analysers calibration in AUTO and Manually by using zero and span gas?
How to calibrate displacer type level transmitter (chemtrol make )for level measurement in hotwell , LP & HP heater ?
