Pressure measurement

PRESSURE MEASUREMENT

• Dennis C. Porlaje

PRESSURE

• Pressure is the amount of force applied on a body per unit area.

ATMOSPHERIC PRESSURE

• Atmospheric pressure is the amount of pressure that the air in the atmosphere exert on a body due to the influence of gravity.

HYDROSTATIC PRESSURE

• Hydrostatic pressure is the amount of pressure that a column of liquid exerts on a body due to the influence of gravity.

Modes of Pressure

PRESSURE ELEMENTS

• Manometer
• Force-summing devices (elastic elements)
• Piezo-electric

U-Tube Manometer

Well-Type Manometer

Inclined Manometer

Force-Summing Devices (Elastic Elements)

• Bourdon Tubes
• Diaphragm
• Bellows

Bourdon Tube

Diaphragm

Diaphragm

Bellows

Piezo-Electric Devices

• Piezo-Resistive Elements (Strain Gauge)
• Piezo-Voltaic Elements

Piezo-Resistive (Strain Gauge)

Strain Gauges & Load Cells

Piezo-Voltaic

Differential Pressure Transmitter

• Pressure (Absolute, Gauge, Vacuum, Differential)
• Level
• Flow
• Temperature
• Viscoscity

LEVEL MEASUREMENT USING DP XMTR

Open-Tank Level

Closed-Tank Level (Dry Outside Leg)

Closed-Tank Level (Wet Outside Leg)

ELECTRONIC DP XMTR

Capacitive Cell

Single Unit

Multi-loop