Answer / carl_ellis

An E/P transducer is a voltage to position transducer, so
its input signal from the control system is a voltage
signal, like 0-5Vdc. Its output is a proportional pneumatic
signal.

An I/P transducer is a current to position transducer, so
its input signal from the control system is a current
signal, like 4-20mA. Its output is a proportional
pneumatic signal.

E/P and I/P are not positioners and are not called
positioners because each is a transducer that converts an
input signal to a proportional pneumatic signal.

A positioner is a much more than a transducer; a positioner
is a controller.

A positioner senses valve position and regulates its
pneumatic output to control the valve position to the
setpoint defined by the input signal.

Where an E/P or an I/P is mounted is a matter of opinion,
plant standard or convenience, it is not dependent on its
function.

A positioner must receive a valve position feedback signal,
so a positioner must be mounted so mechanical linkage can
sense valve position or when mounted remotely from the valve
(like in high ambient temperature applications) a remote
position sensor is used to feed a signal to the positioner.

Carl Ellis
Measure First

Which softwere is required to communicate the S7-300 processor

4 Answers  

---

How to work mass flow meter ?

1 Answers  

---

What is the function of positioner in control valves? does the control valve operate without positioner?

3 Answers   Hofincons,

---

Good Evening all.My question is - For a feed water line to an equipment if i need to measure the flow we will use orifice /magnetic/vortex depend on cost/spec.If i need to measure a ''Alarm''signal and ''Interlock'' from one point i think we can use orifice type in one location with 2 different tapping points - one for alarm and one for an interlock to flow valve..If in case i need to have both these signals(Alarm & interlock) from magnetic flow meter,is it possible??will 2 seperate sensors will be located inbuilt r we can program it ??..i thk we can have one transmitter with these 2 signals...need to know any technical issues are there?pls clarify

3 Answers  

---

what is the control valve?how many types of control valves are there

6 Answers   Chemin, Hindustan Zinc,

---

---

Why we are using thrust bearing at turbine side?

3 Answers   Edac,

---

what is the formula for changing Range of Transmitter from X mmwc to some Y mmwc with respect to DCS NCMH flow range from x NCMH to y NCMH?

1 Answers   HCL,

---

What is an antisurge control system, how it works?

3 Answers  

---

What is the difference between HMI and MMI?

16 Answers  

---

How is work 5/2 sov?

0 Answers  

---

how to calculate interface capelary level transmetar lower S.G.0.54 and uper S.G. 0.26 and h=490 mm

3 Answers  

---

Can anyone provide me the details of GAIL test paper?What is the format and what type of questions will be there? my id-princegnb@gmail.com

1 Answers   GAIL,

---