Pressure Detectors
PRESSURE DETECTORS
PRESSURE DETECTORS
Many processes are controlled by measuring pressure. This chapter describes the
detectors associated with measuring pressure.
EO 1.1
EXPLAIN how a bellows-type pressure detector
produces an output signal including:
a.
Method of detection
b.
Method of signal generation
EO 1.2
EXPLAIN how a bourdon tube-type pressure detector
produces an output signal including:
a.
Method of detection
b.
Method of signal generation
Bellows-Type Detectors
The need for a pressure sensing element that was extremely sensitive to low pressures and
provided power for activating recording and indicating mechanisms resulted in the development
of the metallic bellows pressure sensing element. The metallic bellows is most accurate when
measuring pressures from 0.5 to 75 psig. However, when used in conjunction with a heavy range
spring, some bellows can be used to measure pressures of over 1000 psig. Figure 1 shows a
basic metallic bellows pressure sensing element.
Figure 1 Basic Metallic Bellows
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