Answer / bunny

By using a PID controller we can eliminate the offsets and
unwanted oscillations of the process variables we are
dealing with and will get the process variable value close
to the set point value.For that we need to tune the
controller properly and select proper values for P,I and D

ABB DCS (AC 800 M)redundency take howmany milliseconds to switch from master controller to slave?should be less than DCS scanning time?

2 Answers   SCS,

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whatis diference between zero pressure and obsolute pressure

1 Answers   ABB,

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I have a problem with a valve (air to close). When it is fully closed and try to open 1% it doesn't responce till 3% open suddenly more than 3% then back to 3%. I tried to tune positioner then removed it, the problem still exist. Any idea

3 Answers  

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It is desired to reduce effect of 50Hz pick up in a thermocouple measurement. If a third order LP filter is used for this, what should be its cut off frequency, if gain should be 0.001 at 50Hz.

1 Answers   Honeywell,

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how many parts of valve positioner?

1 Answers   Kentz,

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Difference b/w SCADA & DCS

8 Answers   Siemens,

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whats the reason for control valve not installed -90degree (down position)

1 Answers  

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Dear All can any one told me that VFD Make ABB Model ACS800-01 used for dual Source like 1.DC Source applied at terminal UDC+,UDC- 2. 3 phase 400AC,50Hz

1 Answers  

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How RAL(Rotary air lock)works in cement industry?

0 Answers   Jaypee,

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What is the principle of capacitance type level transmitter?

0 Answers  

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What is instrumentation control?

0 Answers  

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transmitter in 3 connection +,-,And test mode so how Use To Test Mode

1 Answers   Essar,

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