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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
 

 
 
 
Other Instrumentation Interview Questions
 
  Question Asked @ Answers
 
Can someone give a detailed chart on the temperature ranges which can be measured by various temperature sensors.   3
1.what is the role of proportional comtroller in pid controller?2.How do u calibrate the control valve? IOCL 3
An RTD is a_________________________.it works as follows   2
1. what is 3 point calibration & 5 point calibration? 2. If we use hart communicator to set the LRV & URV of a smart transmitter, did we calibrate the transmitter? why? 3. Make a complet list if meterials needed to properly connect a pressure gauge to a steam pipe using 1/2 inch stainless steel tubing. The gauge connections is 1/2 inch NPT-M and the steam pipe tap has a 1/2 inch female coupling, compression fittings are use. 4. What are the tools in loop checking? 5. What would the ISA symbol of a square root extractor look like? 6. What would you do to completely prepare for the configuration? 7. What safety measures must you undertake when doing configuration? 8. what are the two most commonly use programming languages used when we configure a PLC? 9. What would you do if you accidentally skipped a step in the configuration procedure? 10. How would you know if the configuration were sucessful? 11. Name at least 3 selections available when we configure the burnout protection of a controller? EI-Electrotechnical-Institute 2
what are the problem's will accure in dcs or plc hadware and what are the solution for it?   2
what is the relation between flow and pressure.for example relationship between level and pressure is p = phg like that i want ans for this question.and also how to calculate orifice sizing and flow transmitter. pls some one ans for this questions. Orchid 3
Any can guide for QA/QC Inspector in oil & gas region, the procedures, formats standards, design criteria, i search in all enginees but i can't found wat i need????????? Asian-Paints 4
why 8bit microprocessor referred as 2^16?   2
My question may be very basic or childish but this question still persists in me, someone plz help me 1.why do we go for differential equations to analyze a system? 2.why do we solve it using matrices, is there any specific reason for using matrices other than the stories like it is simple,faster etc.   2
what master plc do? Yokogawa 1
How to connect PLC to DCS ? Alkyl-Amines 2
how can we caliberate interface level troll Grasim 2
 
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