Monday, March 19, 2018

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What are the Process Variables?

The Process Variables used in instrumentation are:

•    Flow - Defined as volume per unit of  time  at specified temperature and pressure conditions, is generally measured by positive-displacement or rate meters. Units : kg / hr , litter / min, gallon / min , m3 / hr , Nm3 / hr. ( gases )

•    Pressure - Force acting per unit Area. P = F/A. Units: bar , pascal , kg / cm2 , lb / in2.

•    Temperature - It is the degree of hotness or coldness of a body. Units: Degree Centigrade, Degree Fahrenheit, Degree Kelvin, Degree Rankine.

•    Level - Different between two heights. Units: Meters, mm, cm, percentage.

•    Quality i. e. % O2, CO2, pH etc. - It deals with analysis.( pH, % CO2, % 02, Conductivity, Viscosity )

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