1 Select a suitable measuring sensor or the following situations and justify why
ID: 2087634 • Letter: 1
Question
1 Select a suitable measuring sensor or the following situations and justify why it would be suitable. (a) A pressure sensor for measuring static pressures up to 5 MPa (specify sensing element). (b) A flow meter for measuring mass flow directly (c) A temperature sensor for measuring furnace temperatures up to 1500°c (d) A pressure sensor for measuring rapidly fluctuating pressures (e) A sensor to give accurate, reliable angular displacement (f) A tachometer to measure speeds between 10 rpm and 5000 rpm (g) A sensor for measuring load in a tensile testing machine (h) A level sensor to be used in a silo storing flour (i) A small sensor to act as a thermal cut out switch to protect devices from over-temperature G) A flow sensor suitable for measure sludge flow rate in a pipeline at a sewage plantExplanation / Answer
a. Wheatstone bridge (strain based) sensors are the most common, offering solutions that meet varying accuracy, size, ruggedness, and cost constraints. Bridge sensors are used for high and low pressure applications, and can measure absolute, gauge, or differential pressure. All bridge sensors make use of a strain gauge and a diaphragm
b. Differential pressure sensors are suitable for measuring the volume flow rate of gases according to the differential pressure procedure. The sensors record the minimum drop in pressure on a flowelement.
c. The temperature of an object can be measured by direct contact with the material or indirect bymeasuring the emitted energy of the material with non-contact infrared sensors.
d. Pressure Transducers - Sensors for Test & Measurement. The full line of PCB® of piezoelectricpressure sensors are used for a variety of dynamic pressure measurements. The ability to measuresmall pressure fluctuations at high static pressure levels is a unique characteristic of piezoelectricpressure sensors
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