Answer / iyyappan.m

Open loop is a only one transmitter here is no control of valve or anything.

Closed loop is a Pid loop ,transmitter control the control valvewith operator desired setpoint.

7. What are tri-state devices and why they are essential in a bus oriented system

1 Answers  

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How we can re-range the DP transmitter, range is -0.5 to 2.0bara. new range is -0.5 to 5 bar

2 Answers   Rosemount,

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i am from instrument branch i want paper patern of mahagenco . any pevious years paper regarding my branch send me please . please.....

0 Answers  

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POSSITIVE PULSE IS APPLIED TO AN INVERTER INPUT.THE TIME FROM THE LEADING EDGE OF THE INPUT TO THE LEADING EDGE OF THE OUTPUT IS 10 ns. THE TIME FROM THE TRAILING EDGE OF THE INPUT TO THE TRYLING EDGE OF THE OUTPUT IS 8 ns. WHAT ARE THE VALUES OF tPLH and tPHL?

0 Answers  

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what is sequence table in DCS . make a logic in sequence table for tripping of ID fan in Boiler(in YOKOGAWA CS 3000 DCS).

1 Answers   Yokogawa,

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in which principle pressure tx,level tx ,flow tx,temp tx ,control valve works?

0 Answers   IOCL, JSW,

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i am having information technology branh ....... can i prepare for psu exam

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How to check loadcell working or notworking

2 Answers  

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A DP transmitter is used to measure the level of an open tank. The drain line of the tank is connected to a control valve, and is configured as, if the level of the tank is 90% the valve should get open 10%. And if the tank level is 10%, the valve should get open 90%. Draw wiring diagram and explain how to configure DP transmitter and control valve using HART communicator. If the span error at output is 1%, what will be the %opening of the control valve at 60% level of the tank?

0 Answers  

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Distributed control system

1 Answers   CCIE,

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whatis virtual instrumention?

5 Answers  

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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?

1 Answers  

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