Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / j jones
Sai Kiran.c is correct is saying that we don't start from 0mA because we need a "Live Zero" this is so that if the control loop goes open circuit we have an indication of this.
why do we use 4-20mA, not 1 or 2mA - 20mA, well simply just as in a pneumatic system we use 5-15psi, (0.2-1bar) it gives us the most linear output, and above that, if we were to use 1mA, any induced voltages from eddie currents in cables running alongside could cause a mA to be produced by the resistance of the cable, so our readings would be affected, and if we amplify the signal, the amplification has to be greater as we have to amplify 1mA more than a 4mA signal
| Is This Answer Correct ? | 2 Yes | 1 No |
Post New Answer View All Answers
what is output of FOUNDATION FIELD BUS transmitter
Please any one can provide latest aptitude test,technical test and interview questions for tata consulting engineering (TCE) i need it asap thanks in advance
where uses EXe /EXd/Exo/Exn/Exp/Exq/EXia
how does we calibrate a square root flow transmitter ,give an example and explain it step by step like range calculation , calibration hook up series connection , zero check , and how to apply pressure , and if not geting proportional output then what should we do ?
please tell me what is a light up procedure of Cfbc boiler and what it's axuillaries of cfbc boiler?
How to calibrate Toxic gas detector?
please any body have most important data for study for saudi aramco test of instrument QC thanks email shahnaveedullah@gmail.com
how many types of spped sensors n vibration sensors?their basic principle n connection?
how many types of preheaters are in cement industry & what r they can any body explain?
How to Calibrate Interface Level Troll in field
the 3 most common transmitter protocol being in refinery or qatar gas and aramco.
What is difference between “Fault Tolerant” & “Fault avoidance” PLC? Application where these system s are used?
I am manjunath having exp in maintenance of chemical plants,know i want to do a design course INTOOLS,after doing design course can we get jobs in design field.sinve i dont have design exp..
Q- What are the application in which PNP transistor is preferred over NPN ?
How vortex sensor used for steam flow measurment can be checked on line i.e without taking out from process line.
