Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / haridass
Barriers are used in Hazardous locations to power Intrinsic
Safe instruments. The barrier will reduce the available
loop current to a level that cannot produce a spark.
An Isolator is used to connect signals of different common
mode voltage for example a transmitter signal may be
referenced to +24 whereas the DCS may be referenced to
ground.
You can also have an isolator that is designed for use in
Intrinsic Safe circuit.
Regards
Roy (http://www.control.com/thread/1230701520)
| Is This Answer Correct ? | 28 Yes | 2 No |
Post New Answer View All Answers
What are the charcterstics of a P&ID controller block for Governor speed raise or lower for a load sharing functionality between 4 Gas turbines in droop mode.
How does your previous experience relate to the job you are applying for ?
why we use 3 wire rtd direct wiring for temperature measurement instead of temperature transmitter like bearing temperature
why we are using magnet for calibration of gas detector?
What are continuances of connecting earthing and shield of branch cables (instrument to Junction box), at the same earthing pot provided on JB? Is it ok, or may produce some problem?
What is the function of solenoid valve in on/off & shutdown valve and why it is not used in control valve normally?
How to calibrate radar type level transmitter for interface level? Total liquid(liq.1 and liq.2), level both the liq individually? For. Both the liquid levels how the signal will go from transmitter to dcs? How to calibrate. Single radar 9:26:55 AM for 2 different liquids in a tank?
why any measurement made interms of pressure is more accurate ? to be more precise most of the flow velocity is made interms of pressure and it is accurate. what is the reason behind pressure measurement being accurate ?
Can combine control system for Emergency control system (ESD)and Fire & Gas System ( F & G) is possble to built and offer to client? Can such system is as per Norms in India?
what can of fault ofently come in vibration mesurement?
What is ultrasonic flowmeter?
please can any one tell me clearly about pid tuning i am confusing about this .how to tune pid easly?
Specify ideal accuracy of flow element like orifice plate, Ventury, Annubar. Ultrasonic flow meter etc.
can any send me a forbes marshall dtron 316 manual
HI, can anybody give details about GAS TREATMENT PLANT CONSTRUCTION,as INSTRUMENTATION ENGINEER what are the responsibilites.what are the instruments mainly instrumentation engineer will deal with
