In 2 wire transmitter 1 wire is used for power and other is used for signal( 4

In 2 wire transmitter 1 wire is used for power and other is
used for signal( 4-20)ma
In 4 wire transmitter 2 wires are used for power and 2 wires
are used for signal (4-20)ma .

but my question is "what is the criteria or parameters we
have to consider while selecting these transmitters for eg(
distance, safety zones etc.

Question Posted / mohi

1 Answers
4525 Views
I also Faced
E-Mail Answers

In 2 wire transmitter 1 wire is used for power and other is used for signal( 4-20)ma In 4 wire t..

Answer / omer baosman

A 2 wire xmitter is powered by the mother instrument. The
output signal(4-20ma) is returned on the same wires that
powers it. the main purpose of this design is to reduce
wiring cost, standrdisation of circuits, and above all, to
kep all the transmitters at same ground potential.

A 4 wire inst. has design flexibility to utilize any power
like, 230vac, 24 vdc or 110 vac. It can feed the signal to
any mother instrument. Wherever the basic sensor of an
instrment needs power other than 24 vdc (like chemical
analyser) u have no choice but to use a 4 wire xmitter.

Is This Answer Correct ?

4 Yes

0 No

Post New Answer

More Instrumentation Interview Questions

What are the most frequent problem faces with Vortex flow meter?

1 Answers

what is working principle of presure and temperature guage?

4 Answers

what is PID n give me brief info. about P&I&D.

2 Answers

The pressure class rating (such as 150 lb, 300 lb, etc.) of a line appears in the form of ________________ in the Line Number (or Line Designation) on a P&ID

1 Answers

what is difference between modbus & fieldbus

1 Answers ABB,

what is the reason while warning lamp is on while the engine is cranking?

0 Answers Jindal,

radial & axial vibration sensor output voltage is ac or dc volt?

8 Answers Vedanta, Voltech,

what is difference between call out and call log

0 Answers Petro Rabigh,

where i can get training in INTOOLS and PDMS in Delhi-NCR OR north part of India. please reply with ur ans. at arunsamkaria@ymail.com

0 Answers

when we calibrate the DP transmitter at that time which matrial we used in pressure pump?

4 Answers

Is that Speed Probe and Vibration Probe sensors are same,if yes what is the diff b/w them?

2 Answers

Dear friends, I have a question: We work on a project which has some boilers to provide steam for desalination unit. The boiler area is safe and the only hazard source is the fuel lines of boilers. I want to know according to NFPA standard which type of instrument should be selected on the fuel line: Eex Type or Non-Eex type? Thanks in advance

2 Answers

For more Instrumentation Interview Questions Click Here