2. TRANSDUCERS
A device which converts 1 form of energy into
another.
In a process industry 4 basic and very important
parameters to be measured and controlled are:
1) Flow
2) Temperature
3) Pressure
4) Level
10. PRESSURE GAUGE
Generally named as Pressure gauges
or Vacuum gauges.
Absolute pressure is zero-referenced
against a perfect vacuum, so it is equal to
gauge pressure plus atmospheric
pressure.
Gauge pressure is zero-referenced
against ambient air pressure, so it is equal
to absolute pressure minus atmospheric
pressure.
Differential pressure is the difference in
pressure between two points