Answer / bunny

Valve positioner is an instrument used with automatic
control valves,not with a manual valve.An automatic control
valve open/close basicaly according to the control signal
from a controler(e.g a PLC),say,4-20MA.For every control
signal comming from the controler,there would be a
corrsponding position for the valve plug,which determines
the flow rate.But in practical applications,the valve
position might not get maintained by the controller action
alone.So if there is any deviation in that position,we need
to rectify that and for that we are using a valve
positioner.

diff bw range and span?

3 Answers  

---

how to convert transmitter milliamps output to like temp,pressure etc.....

5 Answers  

---

what is Dry Leg calibration and where is it used

1 Answers   Petrofac,

---

Will Intergraph support SmartPlant Instrumentation in an AutoCAD or MicroStation environment on a long-term basis?

1 Answers   Siemens,

---

why does a transmitter o/o signal starts from 3-15psi or 4- 20mA?

11 Answers  

---

---

If a flow transmitter (magnetic type FT) that can measure flow and temperature, then why in some industries people use flow transmitter and temperature transmitter in the same line 1 after another? Even after 1 single flow FT is capable of measuring flow as well as temperature.

1 Answers   Process Control Technologies,

---

In a ball valve which require 24v dc supply to operate, whose solenoid valve doesn't have any + or - indication, how can we make wiring connectionto solenoid valve?

1 Answers   Process Control Technologies,

---

How to convertion 100 m3/hr to mmH2O or to Kg/cm2?

0 Answers  

---

what is Least Value of MICROMETER?

3 Answers  

---

what is remote mount with MTA option? (In case of Dual Sensor Vortex Flowmeter,rosemount has written in its catalog drawings).

2 Answers  

---

Please any one can explain how to calibrate transmitter (smart) online with out remove from the container suppose it is interface level or static pressure level measurement we dont want to remove transmitter from the container mean it is running plant please give me detail. thankx brothers

1 Answers   KNPC,

---

why 1 to 5 vdc is used for output measurment

4 Answers  

---