Interested to Buy Any Domain ? << Click Here >> for more details...
What is the difference between instrument earthing and normal earthing? and why is it necessary to do so?
- 3 Answers
- 31968 Views
- Atul, I also Faced
- E-Mail Answers
Answer Posted / jigaranadkat
Dear Shashank,
There are mainly three types of earthing used in instrumentation.
1) Power earth
2) Signal / Instrument Earth
3) IS Earth
Power earth :
Provides ground reference to all power cables. Usual practice to have MAX . Earthing resistance ~ 100 Ohms (There is no harm if it is lower)
Signal / Instrument Earth :
Provides ground reference to all Signal cables (including ICS systems).
Usual practice to have MAX . Earthing resistance ~ 10 Ohms (There is no harm if it is lower)
3) IS Earth (Intrinsically Safe Earth) :
Provide ground reference for all IS signals. MUST NOT EXCEED 1 OHM.
You can have multiple earthing pits of same kind of earth and can be connected in parallel in order to reduce the over all resistance.
| Is This Answer Correct ? | 13 Yes | 9 No |
Post New Answer View All Answers
A valve in series with an orifice plate (DP transmitter), is aligned for constant pressure in the pipeline, if there is an error dx, How to align it in process.
What is the diffrence between digital signal processing and discrete signal processing?
can anyone can let me know in Eurotron Micro cal 2+ calibrator in milli amps source mode we are not able to get 20 milli amps output it only produces 1.52 milli amps out, but display shows increase in milli amps , and err6 displays, let me know how to remove the err 6.
what is the PC interface and software for connection to ABB logic module “ LM011-CE18RAC “ ( for Programming ) ??
what is piezoelectric transducer?give an example in power plant n state its principle?
I have got a call of IOCL interview for projects having 2yrs experience. What sort of questions should I expect in the interview?
how the arrangement of equipments done in control room
please tell no. & add. of consultancy who recruit me in power plant as instrumen engg. present i m working in power plant as ass.t instrument engg. thanku mahesh 09226562826
Isometric drawings are generated during _________________ phase of a project
What is instrumentation instrumentation engineering?
how to control pid
what is function of sensor, and how is it work , explain with difination
Decibel.
Name different types of bourdon tubes.
Explain the use of hair spring in the pressure gauge.
