Interested to Buy Any Domain ? << Click Here >> for more details...
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
- 7319 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
OBJECTIVE TYPE QUESTIONS OF ANALYTICAL INSTRUMENTATION
can anyone tell me about the basic concepts to consider before to start a PLC panel wiring
what is maxdna ?. explain about the software details.
(1) In turbine, what does term CDP, NI, NH, HSSOC, means. (2) What is the purpose of LO overhead tank in turbines.(3) An equipment is certified for EEX, IA, IIC,T6, what do you under stand by this.(4) what is SURGE, and how it is prevented, what is the purpose of bypass valve across AS valve.(5) Give 2 application of quartz crystal used for process parameter measurement.(6) what is meant by cold float of compressor shaft. (7) state four different types of flow measurement. For gas flow measurement mmscfd is the common unit. Expand the unit and specify significance of word S in the unit.(8) what is meant by Gap voltage, in vibration measurement. Normally how much Gap voltage is set and state the reason.(9) what will the new flow factor if D/P transmitter is Re-Ranged from 25” wc to 50” wc.(10) what is the usage of QDV & Volume booster.
Please asked me How calculate DCS controller memory.
any body who gone thru recent iocl interview.INSTRUMENTATION questions. I need.
Explain the mechanism behind the turbine meter.
What materials are used in thermo wells?
Decibel.
why we use the ac supply load cell>?can we use the dc supply load cell?advantages and disadvantage of the ac supply load cell?
Explain the key components of control loop?
what is easiest way to read STL language in PLC?
What should be the main consideration while starting the Rotating compressor when we dont know the cut in and the cut off pressure setting of the pressure switch
why Fahrenheit unit of moistur analyzer transmitter
TECHNICAL/ARTITUDE
