Explain about 4 wire instrument concept & tell about its
wiring fron sensor in Field to PLC panel.Explain with an
example?
- 3 Answers
- 11893 Views
- IOCL, I also Faced
- E-Mail Answers
Answer Posted / ranjith_asp
As the name suggests, these instruments will have 4 wires
connected to its Terminal Block. Take a Pressure Transmitter
for example
- 2 wires are for Power Supply. Typically 24VDC. This is to
power the instrument to make it work. These 2 wires will be
routd via a JB and then connected to a power supply module
in the PLC cabinet.
- remaining 2 wires are for 4-20mA signal transmission. This
output signal will be proportional to the measured Pressure.
These 2 signal wires will be connected to the AI card in the
PLC cabinet.
| Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
Linear amplifier.
Describe a time when you anticipated potential problems and developed preventive measures.
Displace type LT to be calibrated in workshop, wt. 40, dia- 60 mm, density- 0.8kg/cm3.
Emergency Shutdown Systems/ Plant Shutdown System.
Which is your favourite subject & explain any one topic of it.
Name different parts of a pressure gauge.
Introduce yourself which is not present in your biodata?
What are primary elements of measuring pressure?
What are the types of control valves available
Meaning of the following a. IOP- Manimum; b. IOP- Maximu,;
What is the use of GMV in turbine?
Sir,I am going to sit for IOCL written test exam. recently.Can anyone tell me the name of 'Objective type Question Book on Instrumentation Engineering ' which will help me. Pl. mail to bidyut_71@rediffmail.com / bidyut.saha2008@indiatimes.com / bidyut.saha09@yahoo.in
why would you like to join our company
Please send me the sample question of Instrumentation of hpcl/iocl exam. my mail id hihi_kiholo@rediffmail.com
How does temperature bath work? How does coil gets heated only by applying some current?
