Answer / vinoth

In RTD, we are measuring temperature through Resistance
change. Normally we are measuring this parameter in the
field. while transmitting, these signal to control panel
through cable, some additional resistance due to distance
will add upto the RTD resistance value. which shows
incorrect value. in order to overcome these, normally in 2
wire system, we will manual add/subtract some resistance
value with the measured resistance value.but it is no percise
whereas in 3 wire system, a parallely third wire run with
the two polarity wires, but its direction of current flow is
opposite to the other two. so it will cancel the line
resistance and give exact value. similarly, for more precise
and accurate measurement, we mostly use 4 wire system.
In above mentioned description, the addition of resistance
or removal of line resistance through extra wire is called
compensation for RTD

Answer / sandip patel

RTD means resistor temperature detector .its resistance is increase with increasing of the temperature. 2wire RTD is used for direct use of it but 4 wire RTD used when the compansation is needed in plant for removing the errors.

1)How many tpes of vibration probe and how many tpyes of vibration. 2)how we can calibrate a vibration probe with tk3 3)what is RMS value in vibration measuring application and how we calculate it.

0 Answers  

---

IF PLC POWER FAILURE THEN WHAT HAPPEN?

2 Answers   IFFCO,

---

Can a Differential Pressure Transmitter be used as a normal pressure transmitter??

3 Answers  

---

Why we used cage in control valve?

8 Answers  

---

In thermocouple could we use the lug for termination or not,Thermocouple is any time,I am currently concerned with K type.please let me know if anybody know

4 Answers   Saudi Aramco Shell Refinery Company SASREF,

---

hi friends,im an instrumentation and contol engg student,can u hlp me of suggsting barc written question paper,my id is roysuvaranjan@gmail.com, cel no.9563591747

0 Answers   BARC,

---

suppose there is gas flow meter I want to know weather meter calibration is done at high pressure or low pressure? pls justify.

2 Answers   Siemens,

---

Any body have know try work calculation ???

0 Answers  

---

What is surge and how is it prevented, what is the purpose of bypass valve across AS valve.

0 Answers   ADMA OPCO,

---

what is the different between deflection type measurement and null type measurement in RTD?

0 Answers   SHR Solutions,

---

What is the three element? And how it work?

1 Answers  

---

How to convert mmWc(mili meter water colam) to tph(ton per hour)?

0 Answers  

---