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Ultrasonic type
Turbine
flow meter
Electromagnetic flow meter
Used in conjunction with variable inductance sensor
Good for very high flow rates
Can be used for both upstream and downstream flow
measurements
Not suited for fluids containing abrasive
particles
Relationship between flow rate and angular velocity is linear
Least intrusive as it is noncontact type
Can be used with fluids that are corrosive, contaminated, etc.
The fluid has to
be electrically conductive
Thermocouples
Thermistors
Thermodiodes, thermos transistors
RTD—resistance temperature detector
Infrared type
Infrared thermography
Temperature sensors
This is the cheapest and the most versatile sensor
Applicable over wide temperature ranges (-200∞C to 1200∞C
typical)
Very high sensitivity in medium ranges (up to 100∞C typical)
Compact but nonlinear in nature
Ideally suited for chip
temperature measurements
Minimized self-heating
More stable over a long period of time compared to
thermocouple
Linear over a wide range
Noncontact point sensor with resolution limited by wavelength
Measures whole-field
temperature distribution
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