Is it possible to convert 4 wire transmitter to convert to
2 wire with additional relay.Please send detial with
drawing,i will appreciate.
- 2 Answers
- 6275 Views
- I also Faced
- E-Mail Answers
Answer Posted / carl_ellis
No, it is not possible to convert a 4 wire device (power on
2 wires, output signal on 2 wires) to a 2 wire, loop
powered transmitter.
A 2 wire loop powered transmitter uses 3.7mA of the current
loop to runs its electronics. That's why the 'live zero'
starts at 4.0mA, so that there's some power avialable to
the transmitter's electronics.
There's lots of technologies that cannot run on the limited
power of approximately 3.7mA at 24Vdc. Thermal dispersion
flow meters, most wet cell gas detectors, thermal
ionization detectors, to name a few, which have to be 3 or
4 wire devices in order to have sufficient power to operate.
Carl Ellis
Measure First
| Is This Answer Correct ? | 4 Yes | 0 No |
Post New Answer View All Answers
what is thermo coupler and how it works
What is the use of gauge?
how many maximum enter 2mm Dia solid cylindrical pipe into 8mm Dia hollow cylindrical pipe. give answer with calculation.
what is the difference between -24 : +24 & 0:24 and where it use?
What is mean by analytical instrumentation?
i hav applied for the post of engg. in iocl so please require the past test papers fro instrumentation engg please please help me and send me the papers or tell me the pattern and type of ques asked in examination......
what is sliding spool valves?
How will you calibrate an Absolute Pr.Transmitter of range 400mmHg absolute ?
What are the charcterstics of a P&ID controller block for Governor speed raise or lower for a load sharing functionality between 4 Gas turbines in droop mode.
If we increase only P what will be controller action ?
PLEASE PROVIDE SAMPLES OF CHEVRON SKILL TESTS
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.
I m appointed as an automation trainee engineer in small firm in that I am only the one , my company give me a project on s7-200 as i m beginner I don't know how to program so please send me the helpful site so that I complete my project before deadline....please help me out in this critical situation.
hiii.... can any one provide me previous years question paper of hindustan petroleum for instrumentation engineering???
how to calculate range of level transmitter?
