sensors and shit

Question 1

Flow sensors

Answer 1

Orifice meter, magnetic flowmeter, turbine sensor, coriolis meter

Question 2

orifice meter

Answer 2

based on pressure drop of fluid across restriction which is proportional to volumetric flowrate

Question 3

magnetic flowmeter

Answer 3

conductive fluid moving at right angle to magnetic field induces voltage proportional to fluid velocity (good for gravity flow, slurry and close to vap pressure).

Question 4

turbine sensor

Answer 4

magnetic rotating coil emits pulses at a frequency proportional to volumetric flow (not for dirty fluids)

Question 5

Coriolis meter

Answer 5

coriolis effect where flowing fluid in pipe causes a twist in vibrating pipe loop

Question 7

Pressure sensors

Answer 7

bourdon tube gauge, diaphragm gauge

Question 8

Bourdon tube gauage

Answer 8

measures pressure by straightening of a tube

Question 9

Diagragm gauge

Answer 9

fluid pressure causes diaphragm displacement which is proportional to the applied pressure

Question 10

level sensors

Answer 10

DP cell, float sensor

Question 11

DP cell

Answer 11

liquid level exerts a hydroelectric head proportional to level determined by pressure difference

Question 12

float sensor

Answer 12

change in buoyant forces of a float is proportional to liquid level

Question 13

Temperature sensors

Answer 13

Thermocouple, resistance temperature detectors (RTD), thermistors, infrared sensor

Question 14

thermocouple

Answer 14

wires of different metal join together based on principle different metals expand differently with temp

Question 15

Resistance temperatures detector (RTD)

Answer 15

electrical resistance of metal wire increases with increased temperatue

Question 16

Thermistors

Answer 16

made of superconductor where large change in resistance proportional to small change in temp

Question 17

infrared sensor

Answer 17

infrared radiation from object varies with temp - radiation is absorbed and converted to heat