Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / v.r.m.kiran
We are using 4 to 20ma because
1. Distinguish between process Zero & Instrument Zero.
2. It is easy to convert 4 to 20ma to 1 to 5v(Digital
Signal) by using a 250 Ohms Resistor in series.
V = IR
V=4*250=1000 MV = 1V, 8*250=2000 MV = 2V, 12*250=3000 MV =
3V, 16*250=4000 MV = 4V, 20*250=5000 MV = 5V.
3. Now we are using digital Indicators for display. Olden
days there will be analog display meter in the transmitter
for indication(0 to 100)%. When we apply 4ma or while
checking the transmitter online pointer should indicate
zero then we say that instrument is working correctly but
it comes bellow zero we have to check our instrument & have
to calibrate.
| Is This Answer Correct ? | 10 Yes | 3 No |
Post New Answer View All Answers
In turbine, what does term CDP, NI, NH, HSSOC, means
what deference between panel earth and systemearth
Can anybody tell me which type of question are asked in the interview for the FORMULATION(Pharma) as a instrumentation engineer, & question in building managment system.
Explain operation of Haskel pump.
Sir , i have completed my M.Sc In Instrumentation and presently working in Maintenance department 3 yrs Exp , is there is any possible for work in offshore ..
can any send me a forbes marshall dtron 316 manual
give eg of how I/P is used in control loops
Explain Gas Turbine startup and shutdown sequences
Programmable Logic control.
How will you calibrate PID controller? explain with example.
How many types of sensor
what is intrinscily safe system and where we use?
Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72
Why flow/pressure transmitter before control valve?
how to calibrate load cell
