Interested to Buy Any Domain ? << Click Here >> for more details...
why 4 to 20 ma ,why not 0 to 20 or 3 to 15 or anything
- 19 Answers
- 48137 Views
- Honeywell, TCS, TN, I also Faced
- E-Mail Answers
Answer Posted / subash
from field to control room we use lengthy cables.due to the
resistance of the cable may voltage drop occur.hence we
always choose 4-20 ma over a 0 to 10v....if we select 0-20
ma then we can'n distingush between faut condition and
minimum scale....hence we choose 4-20 ma....
| Is This Answer Correct ? | 4 Yes | 1 No |
Post New Answer View All Answers
Linear amplifier.
Turbidity analyzer working principle ?
What is frequency factor in massflow meter? When using frequency output?
A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.
what is instrument philosophy
what is the procedure of belt scale calibration?
What are the application of bernoulli’s theorem?
Draw a simple circuit for a well head control panel used to protect the well against fire, leak, blockage, ESD, & controls the operation of one downhole & one surface safety valve. Explain the operation and controls
what is the procedure of O2 sensor(ABB) calibration?
Hi, Is there any smart plant instrumentation design training institute in Bangalore?
Why use ball valves on Gas pipelines instead of gate & or globe valves...means basic diffrence or use of these valves..how designers knows this type of valve with rating is required...
how to calibrate load cell
What are different types of cable?
how many types of viberation transmitter and how to calibrate and where use of vibration transmitter
The Design Calculation of Level Transmitter For Different Structure open & Closed Vessel, Eg. Diff. Level Tx., Capacitance For Continous Operation
