Answer / prashant

in three wire rtd, wire(lead) resistance is compasateed
automatically as per signal cable which is shorted in rtd
probe/sensor.
in two wire rtd we require room temp. compasation. but it
is depend on signal cable length resistance, so we reqire
fix length of signal cable which is lead resistance must
be clculated with room temp. compasation.

Answer / rk

basically as lenght of wire inc resitance inc.henace a lead compensator is given in 3 wire rtd and gives best results over a far distance from source.
but 2 wire rtd has effect of temp.hence it is used for smaller distance which is not much preffered

How to Calibrate Level Switch in field

0 Answers  

---

Can we use PLC in Hazardous Area?

2 Answers   MNHG,

---

why we use 0.2 to 1.0 kg/cm2 output in control valve

4 Answers   GNFC,

---

When a field input to plc is coming from 400 to 600 meters and the input is in 24 V DC? So signal cable of which cross section i should select for proper signal to plc?

5 Answers   Exxon Mobil,

---

How is work 5/2 sov?

0 Answers  

---

What is shielding effect?

0 Answers   Process Control Technologies,

---

how to calibrate displacer type level transmitter by dry weight method please mention formula for weight calculation

1 Answers  

---

Which standard is used for calibration of Control Valves ?

2 Answers  

---

What are the processes Variables?

4 Answers  

---

What is Cryogenic?

2 Answers  

---

why we are using magnet for calibration of gas detector?

0 Answers   NSH,

---

WHAT IS A SYMPTOM OF FAULT WITH THE SPAN OF AN INSTRUMENT? 1)ZERO-POINT AND 100% ARE CORRECT BUT NOT A MID-RANGE. 2)ZERO-POINT IS CORRECT ,BUT 1005 INPUT IS NOT GIVING 100% OUTPUT. 3)LINEARITY PRBS. 4)1005 O/p IS CORRECT BUT ZEO POINT IS WRONG.

1 Answers   Reliance,

---