Answer / manan2347

RTD's output is resistance.
As we know RTD means resistance temperature detector, so we measure resistance across the terminal of RTD by multimeter.

Now assume measured resistance is "X" and RTD we are using is PT100 then,

T(temp)=(X-100)/(0.386)

*PT100 RTD shows 100 ohm at 0°c

Answer / rajesh.

RTD is Resistance Temperature Detector. As temperature varies resistance also change. So the output of RTD is Resistance. Which in terms converted into current (4 – 20 ma) by means of Transmitter. Generally RTD is available as Pt100.
Pt100 means 100OHMS at 0’ C for a platinum resistance bulb.
Formula for RTD:
Rt. =Ro (1+α t)
Rt. =Resistance of zero temperature.
α = Co. off of thermal (expansion)
t = temperature to be measured.
Example:
Calculation of Resistance or Pt 100.
Ro. = 100
α for platinum = 0.00385/c.
To calculate Resistance at 100’c
R100 =100(1+(38.5*104*100))
100+ (100*0.385)
R100 =138.5
Resistance at 100’c = 138.5

why relays are used with plc?

4 Answers  

---

how to calibrate steam control valve in steam turbine

0 Answers  

---

What is megering????

2 Answers  

---

Why plc require in analog input 4-20amp & 0-10 volt?

0 Answers  

---

What is procedure on mmwc in to tph

2 Answers  

---

kindly tell where orifice,nozzle,air foil,ventury used in flow measurement?

1 Answers  

---

Pressure tx shows 1 mbar but we need 1000 mbar at this process condition .. how can we sort it out .

0 Answers  

---

explain the working of Coriolis Flowmeter.

2 Answers   ABB,

---

I have transmitter of range -20 to -5 kpa.if it is possible to zero trim with atmospheric pressure,means HP and lp having no pressure...what will get after zero trim and it is the right way.....plz give me reply ....

3 Answers   KOC,

---

What is three element in drum level?

0 Answers  

---

What is the purpose of the analyzer in petrochemical plant?

0 Answers   ENI, Lakshmi Machine Works,

---

what is isloted barrier how it works and what are the main purpose.how it make safe area.

0 Answers  

---