what do you mean by CJC (cold junction compensation).?
Answers were Sorted based on User's Feedback
Answer / balajirajgopal
i assume u asked for thermocouple .as per seeback effect 2
junctions of the thermocouple should be maintained at
different temperature i.e. hot junction in high temp and
cold jn at zero degree temp.but in practical application it
is difficult to maintain cold jn at 0deg C .so a thermister
is placed in the location where the cold jn. is kept.the o/p
of thermister is used to measure the temp at that location
and is used in calculation to neglect the the effect of temp
at cold jn.
pls dont ask me the calculation,bcause i am also searching
for it.
Is This Answer Correct ? | 14 Yes | 3 No |
Answer / suresh agravat
cold junction compensation means TC having 2 point one is hot junction an another is reference junction (not cold) once the hot point read the temperature mv dc will generate and it will travel from hot junction, reference junction then compensation cable cable to temperature transmitter. temperature transmitter having thermistor which read atmospheres temperature and it'll plus this temperature with main temperature
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / n.3vedi
CJC is that , we are making cold junction at 0 degree C by (any means) for measuring the perfect temp. of that hot body.
Is This Answer Correct ? | 1 Yes | 3 No |
Answer / raja
CJC reason
01)0 degree compansation
02)third metal junction compansation.
Is This Answer Correct ? | 0 Yes | 6 No |
Answer / nilesh karpe
CJC-IS the cold junction compantion.it is used in
thermocouple.two dissimiler metals joined together it forms
thermocouple.if we apply voltage tn one junction is hot &
another becomes cold Junction.
such Thermocouple generates MV output signal according
to metal characterstics.it gives 0 mv for 0 degree. to
measure actual temperature of the measuring point we should
remove the temp. of measurment envirnment for that the
compansation equals to surrounding temp. is provided and
used as 0mv.
This ref. 0V is generated by Three Methodes-A)Electronic's
0 V ref.,B)Ice bath Methoad,C)by using Peltier cooler .
Is This Answer Correct ? | 0 Yes | 7 No |
What is the reason PT speed not incresed in gas turbine?
Any body have know try work calculation ???
what is the PID controller?
Difference b/w SCADA & DCS
in current transmitter why we use 4-20ma ???
Waht is surge in compressors and how to control it?
Explain the thermocouple and RTD?
what is isloted barrier how it works and what are the main purpose.how it make safe area.
whats the working principle of level transmeter?
why we are using 4-20ma why cant we use 4-40ma
What is the meaning of slope in PH transmeter?
How to work mass flow meter ?