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Question
why we use 250 ohms across HART CALIBRATOR DURING 
CALIBRATION OF TRANSMITTER
 Question Submitted By :: Instrumentation
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
If we do not use 250 ohm resistance then our HART calibrator
shall connect directly to power source, hence it won't be
part of our transmitter loop.
 
Is This Answer Correct ?    11 Yes 7 No
Xyz
 
Answer
# 2
WE USE 250 OHMS RESISTANCE ACROSS HART CALIBRATOR DURING
CALIBRATION OF TRANSMITTER DUE TO LOAD GIVEN TO TRANSMITTER
FOR COMMUNICATION PURPOSE
 
Is This Answer Correct ?    1 Yes 0 No
Hansdas B.jaiswal
 
 
 
Answer
# 3
Loop Impedance required for communicator will be minimum
250ohms
 
Is This Answer Correct ?    4 Yes 5 No
Sankar
 

 
 
 
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how many type of control valve?   6
what is the T/C & RTD mesuremaint?   3
If a transmitter is installed 10 m below its tapping point how much pressure exerted if fluid is water? QAFCO 9
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what is vfd(variable frequency drive)?type of vfd.   1
DC motor and DC Drives working funda?   1
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if the t/c o/p is 4-20mv then how plc recognize it because we are dealing with the 4-20ma in the plc ????????????????   7
 
For more Instrumentation Interview Questions Click Here 
 
 
 
 
 


   
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