Interested to Buy Any Domain ? << Click Here >> for more details...
why we used for range in pnumatic 3-15 psi and current 4-20
ma?
- 11 Answers
- 41441 Views
- Jindal, I also Faced
- E-Mail Answers
Answer Posted / saravanamurthy
Hi,
4-20 mA standard is mainly to differentiate the conditions
live zero and dead zero i.e let me tell an example consider
a level sensor fixed in a tank . now the tank is empty .
then the sensor will send the reading as 0mA this zero is
live zero, if there is no standard as 4-20mA. in the same
case if there is any problem in the sensor output then also
the reading ll be 0mA this zero is Dead zero.In order to
differentiate the fault and the original process condition
we have chose this range as the standard.
Thanks & Regards,
S.I.Saravanamurthy.
Your comments are welcome
| Is This Answer Correct ? | 101 Yes | 14 No |
Post New Answer View All Answers
what is use of communication wire in multipare cable(oil and gas field), why this communication wire not used in single pair cable?
in valve is constructed as per SME B 16.34, then which standard is used for fire testing of valve?.
what is isloted barrier how it works and what are the main purpose.how it make safe area.
sir, give me placement papers and interview quistion of birla group company of copper.
May I have a brief note above the voltage barriers? Whats is the purpose? Please mail me if you've operational details, mail id: rajkumar.diice@gmail.com
How is PH sensor works ?
What are different types of orifice plates?
i want to know the interview format fot gail, instrumentation. pls answer me in habib.sami1003@gmail.com
How many types of sensor
why we are using digital signals for I/O & how to measure this signals is getting or not ?
can u briefly explain aboutan aryton shunt multirange DC ammeter?
when the instrument tapping on pipe line is located below and transmitter is located above the tapping point for liquid service transmitter, what should we do, is there any additional drain valve is required??
what is controlling card in dcs? how u measure dcs memory?what is bus in dcs?how u know dcs speed n ehternet speed?
1.what is controller proportional gain 2.what is the controller intergral action time. 3.A proportional plus derivative controller that has a proportional band of 20% and a derivative action time of 0.1 minutes. Construct the shape of the output waveform for the triangular input if the input rises and falls at the rate of 4 units per minute.
why use 50% lel methane gas concentration for gas detector calibration instead of 60% lel gas concentration whereas the hi alarm set at 60% lel.
