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Question
HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE 
BETWEEN THERMOCOUPLE AND RTD
 Question Submitted By :: Rajagopal
I also faced this Question!!     Rank Answer Posted By  
 
  Re: HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE BETWEEN THERMOCOUPLE AND RTD
Answer
# 1
Thermocouple when senses gives "mv" readings to the
transmitter. RTD gives "ohm" readings to the transmitter.
For checking put the multimeter in resistance mode and if
the the sensor is throcouple the meter will indicate
almost"0" resitance whereas the RTD would indicate
around "119 ohms" in normal temperature like 30deg.C
 
Is This Answer Correct ?    193 Yes 19 No
Binu
 
  Re: HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE BETWEEN THERMOCOUPLE AND RTD
Answer
# 2
at room temp resisstence of rtd is higher than thermocouple. 
Is This Answer Correct ?    57 Yes 23 No
Yogendra Kumar
 
 
 
  Re: HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE BETWEEN THERMOCOUPLE AND RTD
Answer
# 3
RTD will be find by R2=R1(1+alpha(t2-t1)) Thermo is used to
measure both AC&DC. In Teromcouple characteristics between
Rstistance & tepmerature is non-linear where as in RTD it
is linear.
 
Is This Answer Correct ?    24 Yes 46 No
Sushma
 
  Re: HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE BETWEEN THERMOCOUPLE AND RTD
Answer
# 4
rtd can be checked by measuring the resistance accross the
terminals. At room temp rtd has got a resistance around
110ohm when neasured across its terminal.
t/c can be checked by measuring mv at the terminals
connected. the corresponding mv is corelated with mv v/s
temperature chart to find the temp.
 
Is This Answer Correct ?    51 Yes 9 No
Vinayak
 
  Re: HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE BETWEEN THERMOCOUPLE AND RTD
Answer
# 5
T/C : Just check the contunity
RTD : Check the ohms to the corresponding type of RTD tro
DIN Chart.

* Difference : RTD : Resistance Temperature Detector
The name itself specifies resistance varies according to
the temperature the element detects.

Thermocouple : Thermo : Thermal , Couple : Coupled.
The thermal difference between the coupled point and
seperated point of a thermocouple produces the MV.(Depends
upon the type of T/C)
 
Is This Answer Correct ?    49 Yes 5 No
Srinivasansureshkumar
 
  Re: HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE BETWEEN THERMOCOUPLE AND RTD
Answer
# 6
Simply open the top cover of the device. If the connection
points has + & - symbol indication then it is THERMOCOUPLE,
otherwise it is RTD
 
Is This Answer Correct ?    36 Yes 8 No
Laxman Sonawane
 
  Re: HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE BETWEEN THERMOCOUPLE AND RTD
Answer
# 7
Thermocouple is basically couple of two dissimilar matel
wire which generate certain emf on puting the couple end in
higher temperature source.As emf is generated then it can
measure in terms of mV.Phisically we can check the T/c by
checking it two wires, they will be of different
material/metal alloy.

RTD is resistance temperature detector works on the basis
of resistance changes when temperature changes. Physically
they can be identified by wire exposed to make
connection.In normally everyone uses three wire RTD, in
which 2 wires are of same insulation colour and resistance
between them will be nearly 2-3 Ohms. The resistance b/w
third wire and any of those wire will be 119.5 Ohms at room
temperature.RTD never generate emf hence we can't measure
any mV b/w any of wire of RTD.
 
Is This Answer Correct ?    65 Yes 4 No
Yadav Manoj
 
  Re: HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE BETWEEN THERMOCOUPLE AND RTD
Answer
# 8
more answers are here. Answer No 7 is currect.
but one thing is missed about the color coding of thermo
couple. mostly in industrial section we are using K, E, J,
T , types we can understand the these types from the color
code of TC. you will get further details on

http://www.omega.com/temperature/pdf/tc_colorcodes.pdf
 
Is This Answer Correct ?    8 Yes 1 No
Ajith294
[JAL International]
 
  Re: HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE BETWEEN THERMOCOUPLE AND RTD
Answer
# 9
put multimeter in resistance mode and check for resistance
b/w wires of rtd or thermocouple,If it shows 0 ohm in
normal earth atmospheric temperature it's fine.And There is
no big difference B/w RTD AND THERMOCOUPLE Accorting to the
measurement range(low temp to high temp),Accuracy it is
Differenciated.
 
Is This Answer Correct ?    4 Yes 27 No
Karthik
 
  Re: HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE BETWEEN THERMOCOUPLE AND RTD
Answer
# 10
t/c base of seeback & rtd base of wheatstone bridge kcl.rtd
linear & t/c some distane linear another non linear. t/c
extention cable same use & rtd any other wire use to have.
 
Is This Answer Correct ?    7 Yes 2 No
Abdulbasit137@hotmail.com
[Hub Power Station]
 

 
 
 
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