Answer Posted / mostafa abo el-kasem
Several reasons can cause valve hunting; it can be from signal or from hard ware
To define:
1- Check controller o/p is stable while valve “you can put it in manual mode” is hunting or not (if not stable then it could be from the configuration or from PV change, you can check transmitter/damping/configuration,)
2- If signal is ok ,then it will be hardware problem from
a. Feedback arm not fixed
b. I/P problem
c. Diaphragm damage
d. Flow irregularities
e. Positioner tuning
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
Explain signal isolator
What is the calibration procedure of Drum level transmitter if range is 0 to -400 mmh2o in lab?
-/5A. What is the meaning and limitations of this in energy meter constant. It is a 3 phase LT Energy Meter. If this Energy Meter is connected through a CT of ratio 200/5 Amps, then what is the multiplying constant and how its will be calculated.
please can any one tell me clearly about pid tuning i am confusing about this .how to tune pid easly?
In bently nevada vibration monitoring system,what is the reason to maintain the Resistance of the probe + extension cable equal to 95 ohm? If possible explain the basic principle of measurement with detail electronic circuits.
In turbine what does term CDP, NH, HSSOC means.
What is the main difference between Cavitation and Flashing?
why we should maintain neutral earth voltage below 1V while calibration? why cant it be 1.2V or 2V
need instrumentation job completed 1 year trainee ship in mnc pesticide company. now in search of job
what are the use of belew gear in general ??
How ejector(or)evactor air pump is working in thermal power plant?
what is the difference between active & reactive power?
What is standard of DCS panel design?and what is step of DCS panel design?wiring and type of connector(screw or DB connector)
What is the Working principle of Dozing valve?
Why rdt and thermocouple both give different output .and one things more, how to generate ohm or mili volt plz mail me merajalam143545@yahoo.com
