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

What is minimum distance between three thermocouples (2oo3) mounted on same pipe line (20")? Technically accepted by stright line mounted or circler mounted?

1 Answers  

---

What is the formula to know the error of weighfeeder after having drop test.

3 Answers  

---

How do you troubleshoot accelerometers used in Vibration monitoring/tripping

1 Answers   Air Liquide,

---

why 4 to 20 ma used at 0 set

2 Answers   Borouge, Yokogawa,

---

hi am durga, i just now completed my eie [2009] , can anyone please guide me what r courses i need to join to enter into core company

6 Answers  

---

What is the basic difference between 2 Wire, 3 Wire and 4 Wire RTD

2 Answers  

---

can we create an interrupt in plc through scada?

0 Answers   Glensol, TATA,

---

the basic of a DP flow transmitter are the following

1 Answers  

---

Define cryogenic?

0 Answers  

---

Any body have know try work calculation ???

0 Answers  

---

WHAT IS THE Differance b/w on/off & pid control valve?

10 Answers  

---

How to find out turn down ratio of Pressure transmitter?

1 Answers  

---