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
How many ohms are required for proper earthing?
What is 3 selection available when configure the burnout protection for controller
you must show the examples application and give at least 4 types of transducer/sensors that can minimize the failure during the manufacturing of the resistors.
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.
What is three element in drum level?
Why MUX JB's are using only Temperature Element in Fundation field bus?
hiii.... can any one provide me previous years question paper of hindustan petroleum for instrumentation engineering???
CONTROL VALVE OPERATING IN MANUAL BUT NOT IN MANUAL. WHAT SHOULD BE THE PROBLEM ?
What are different types of orifice plates?
How does work A temperature valve or fv control valve in process plz brief me
Galvanizing.
what is the calibration procedure for transweigh make weigh feeder?
what about your moleg in pogrees with company
Hi Friends i need Electronics&Instrumentation Engg question papers for BARC written test by coming 20th May 2008 pls post ur use full info to kkumarei@gmail.com. Or for suggestions pls give one missed call to 9962122264
please any body have most important data for study for saudi aramco test of instrument QC thanks email shahnaveedullah@gmail.com
