19-01-2016, 12:28 PM
INTRODUCTION :
It is the branch of engineering which deals with the measurement, monitoring, display
etc. of the various of energy exchanges which take place during process operations. "In short Instrumentation is the study of Instrument."
INSTRUMENT :
Instrument is a devices which is used to measure, monitor, display etc. of a process variable.
Que. : What are the process Variable ?
Ans. : The process Variable are :
1. Flow
2. Pressure
3. Temperature
4. Level
5. Quality i. e. % D2, CO2, pH etc.
Que. : Define all the process Variable and state their unit of measurement. ?
Ans. : FLOW : Kg / hr, Litter / min, Gallon / min. M3 / NM3 / HR. ( GASES )
PRESSURE : Force acting per unit Area. P = F/A
Units : Bar / Pascal / Kg / CM /, Pounds
LEVEL : Difference between two heights.
Units : Meters, mm, cm, %.
TEMPERATURE : It is the degree of hotness or coldness of a body.
Units : Degree Centigrade, Degree Fahrenheit, Degree Kelvin, Degree Rankine.
QUALITY : It deals with analysis
pH, % CO2, % 02, Conductivity, Viscosity.
Que. : What are the primary elements used for flow measurement. ?
Ans. : The primary elements used for flow measurement are :
1. Orifice Plate.
2. Venturi tube.
3. Pitot tube.
4. Annubars.
5. Flow Nozzle.
6. Weir & Flumes.