Answer / vikram budhiraja

A process variable can be transmitted (as an analog signal) over a pair of wires either as a voltage or a current.

A current (milliamp) analog signal is preferred in control systems over voltage because the current in a loop cannot be different at the generating end and the receiving end regardless of the length of the wire carrying the signal.

On the other hand a voltage signal suffers a drop ( IR loss) depending on the length of the wires carrying the signal resulting in error.

a pressure transmitter with a range of 0 to 2500kpag has a specified accuracy of 0.5 % of span.It is to be calibrated using a comparison gauge to have an accuracy of 0.1% of span.The comparison gauge has a range of 0 to 3000kpag What is the accuracy ratio? is this ratio acceptable?

2 Answers  

---

how radio frequency level probes works with its controller ? what is its principle ? pls give me brief explanation?

0 Answers  

---

What is difference between sensors and transducers?

2 Answers  

---

What is the diffrence between digital signal processing and discrete signal processing?

0 Answers  

---

What is differnece between leveltroll and interface leveltrol?

2 Answers  

---

what is the meaning of HART ?

2 Answers  

---

how can we caliberate interface level troll

2 Answers   Grasim, IOCL, KOC, Sankyu,

---

WHAT IS THE DIFF BETWEEN FREQUENCY AND INTENSITY?HOW IT WORKS IN FLAME SCANNER ?

1 Answers  

---

How to Calibrate Level Switch in field

0 Answers  

---

what are the basic instructions used in simatic s7-300 plc?

5 Answers   Dr Reddys, HZL, Siemens,

---

An RTD is a_________________________.it works as follows

2 Answers  

---

Pls.could any one Clarify the following with an example. 1.At What condition Close on Rise and Close on Fall Pressure Switch contacts are used. 2.If Pressure is abnormal as per set pressure,if connecting Terminal of pressure switch breaks,how the voltage extends to Relay base. 3.Are these contacts come under fail safe philasaphy.

1 Answers  

---