Answer / praveen

0 milliamp is dead zero and 4 milliamp is live zero

Answer / shibli nomani

Live0-At 0 input ,output has some value e.g at 0 tx has 4mA.
Dead0-At 0 input, output has Also zero.

What are de-saturators?

0 Answers  

---

what is the name of thermocople element cable from field to pannel end?

3 Answers  

---

how u choose thermowell lenght n pnumatic C/v size?

0 Answers  

---

How to ensure vibration sensor functioning accordingly.With out using an other sensor.

3 Answers   ACC, Oil India,

---

In 2 wire transmitter 1 wire is used for power and other is used for signal( 4-20)ma In 4 wire transmitter 2 wires are used for power and 2 wires are used for signal (4-20)ma . but my question is "what is the criteria or parameters we have to consider while selecting these transmitters for eg( distance, safety zones etc.

1 Answers  

---

---

Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =

0 Answers  

---

if RTD damage in plant, how we know?

5 Answers   Reliance,

---

What is impulse line size

3 Answers   IFFCO,

---

What are the difference between mass flow meter, magnetic flow meter and vortex flow meter.

1 Answers  

---

Condensation within a sight glass? Would you expect there to be more problems when using a sight glass if there is condensation on the inside or the outside of the glass, and why?

1 Answers  

---

How much should be the values and/or percentages of these given below factors for a good controller ? Steady state error Delay Rise Time Overshoot Peak Time Settling Time Damping Oscillations & vibrations thanks

1 Answers  

---

What is loop1 and loop2 in MTS LT?

0 Answers  

---