Interested to Buy Any Domain ? << Click Here >> for more details...
In field side transmitter voltage droping here no loose connection then what will happen?
- 2 Answers
- 4704 Views
- Edac, I also Faced
- E-Mail Answers
Answer Posted / carl_ellis
The minimum required loop voltage depends on the voltage needed to drive 20ma (or 21.5mA if fail-safe high is used) through the total loop resistance.
Even if the power supply voltage sags/drops slightly, it is still possible that the loop will function properly, because it depends on the actual loop resistances and the lift-off voltage required by the transmitter
If there is not sufficient loop voltage, it will become apparent when the transmitter fails to go above a certain milliamp output, because there is insufficient voltage to drive more current through the loop's total resistance.
In some cases of low loop voltage, a field transmitter will cycle on and off, re-initializing each time it fails to push sufficient current because it is voltage-starved.
If the loop wiring is sized properly, then a voltage drop is likely due to
- a bad connection in junction box
- in some cases a ground loop from damaged wire insulation
- adding too many additional loads - more transmitters than the power supply is rated for
- failing power supply
- adding another device in series in the loop, like an indicator, recorder, or I/O module input that pushes the total loop resistance too high. Carl Ellis
Measure First
| Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
What are the types of valves?
how radio frequency level probes works with its controller ? what is its principle ? pls give me brief explanation?
I have energy meter for educational project having 0.5s class but my friend need 0.2s class meter , which one is good for that purpose and what is the actual difference of that two classes , need very easy example also.??
Draw symbols of the following :
In dcs panel we are using diff type of modules ?what is module ? what is the use of modules ?diff type of module?
hello sir/madam, I,Subramanian need 5yrs placement papers of officer trainee of Instrumentation technology.pls send to this mail id mani_nxtgen@yahoo.co.in please do the needful. with regards, subramanian.v
What is limitation of the ht.of the displacer of a level trol?
Operational amplifiers
What is the cascade control
how pressurize drum calibrated ?
what is isloted barrier how it works and what are the main purpose.how it make safe area.
give me all the details about the interview and which type of question being asked
Name different types of bourdon tubes.
who's take first position in process in the timing of new installation flow transmitter and control vavle. give the answer with logical trick.
what is effect of specific gravity in differential level transmitter , explain formula related with this .
