Answer / anurag,e&a,ispat ind. ltd.

loop is that by which we feedback some output signal to
input.there are two type of loops.
1.closed loop
2.open loop

Answer / ulaganathan

a loop may be defined as connection of elements
to the circuit making use of feedback.
It may be of open or closed type

Answer / ramanathan

A loop is which has a feed back of output&where the error
deduction has been done.eg. in a closed loop there will be
sensing of value & controller will do the job.

Answer / eid elatawy

Loop can be process loop or instrument loop
for instrument loop is the signal from/to Controller(DCS or PLC or....etc) and this signal started from the instrument(valve or transmitter or...)to junction box to DCS through multi core cable.

How can I map a tank?  Tank 15m h and 42m dia. we just fixed radar type lit. its reading shows over range. Now its required mapping ?

1 Answers   CMC,

---

how can we calibrate the differential pressure transmitter by using HART communicator

8 Answers   Hindalco,

---

What is NODE in DCS?

2 Answers  

---

Describe all types and levels (4-20mA, 0-10V, mV, pulse, etc.)of analog and digital I/O used in process control application.

2 Answers   Jindal,

---

why is honed type flow orifice plate? what purpose it used? how to select this?

4 Answers  

---

---

applications of 1-5v and 4-20ma?

4 Answers  

---

why metallic housing is provided of solenoid valve.

1 Answers   HPCL,

---

what is maximum temprature in instrumentation

1 Answers   Sabic,

---

Define the difference between a stable versus an unstable controlled system and some of the tools you might use to be able to detect when this is happening and assumptions used for control system application design that could contribute to instability

0 Answers  

---

what is absolute pressure, gauge pressure and atmospheric pressure?

2 Answers   Mother Dairy,

---

What is SCADA ? WHAT is it role in DCS ?

3 Answers   Honeywell,

---

i have calibrate rosemount make level transmitter , wht can i do ? my tank capacity is 30,000 liter

9 Answers   Equate,

---