Tuesday 28 June 2011

Define all the process variable and state their unit of measurement?

Flow: Any fluids or liquids flowing from one place to another place is called flow and it is 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,
Pressure: Force acting per unit Area. P = F/A
Units: Bar, Pascal. (gases)
Level: The height of the water column, liquid and powder etc., at the desired measurement of height between minimum level points to maximum level point is called level. The measurement principle is, head pressure method.
Units: Meters, mm, cm, percentage.
Temperature: It is the degree of hotness or coldness of a body is call temperature.
Units: Degree Centigrade, Degree Fahrenheit, Degree Kelvin, Degree Rankin.
Quality: It deals with analysis. (PH, Conductivity, Viscosity)

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