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Chemical Engineering

CHEMENG 2G03

Joe Kim

Fall

Description

Measurements 2I03 Exam Summary Sheet
AmritAulak
Measuring Devices
Device Name What It Other Lin/ Equation Cost Acronym Accuracy Durability/ Use
Measures Variables Non- Anywhere
Lin
Thermometer Temperature Density, - - Very - 0.2-1 (C) Good/ Low Limit to
Height Cheap Temp
Bimetallic Temperature by Expansion - - Cheap - - Good/ High Temp
Thermometer bending of two Coefficients of
metals Metals
Infrared Temperature by Emissivity T^4 Mod IR device Decent Great/ Medium
Thermometer Emissivity Non- Temp Limit
Linear
Resistance Temperature by Resistance Lin Expens RTD 0.1 to 2 (C) Robust/ Slow
Temperature Resistance Response Time
Detector
Thermistor Temperature by Resistance e^(1/T) Mod - 0.02 to 0.2 Fast Response Time
Resistance Non- (C) / Narrow Range
Linear
Thermocouple Temperature by Current, Non- Cheap - ~0.1 to 2 (C) Wide Range/ Short
Current Volumetric linear term Stability
Resistivity
McLeod Gauge Pressure by Hg - - - - - - Low Pressures
ONLY 10-150 Pa
Barometer/ Pressure by Density of Lin b/w Cheap - - Medium Range
Manometer height of fluid Fluid height
in tube Height and P
Deadweight Pressure by Fluid Density Lin with Med - 0.05-0.01% Higher Pressure
Tester Force on Inc Forces F/mass of Reading Range <200 MPa
Fluid Area Pressure Pressure by - - - Med - - -
Transducer Mech: Physical Motion
Bourdon, Bellow, of Pipe/ Balloon
Diaphragm
Pressure Pressure by Piezoelectric - - - - - -
Transducer Elec: Electrical Constants
Piezoelectric Charge
VariableArea Flow Meter by Pressure, Re, Flow Med - 2-3% of Venturi causes little
Flow Meter: Pressure Drop Discharge Ko affected (orifice) reading Pressure Drop,
Venturi, Orifice, by to Exp Nozzle medium,
nozzle (P)^1/2 (venturi) Orfice Large abrupt
drop
Magnetic Flow Flow Meter by Flow, Velocity, - - Exp - 0.5-1% Small Range/ Only
Meter voltage of fluid Voltage conductive Fluids
passing
Rotameter Flow Meter Drag Force, - Cheap Variable 2-4% of Only for Gas/
force balance on Weight, Area reading Liquid, Must be
float Buoyancy, Vertical and In-line
Velocity
Turbine Flow Flow Meter by Angular Lin Q = Kω Med - 0.25-1% High Q, T, P, not
Meter angular velocity Velocity close to Joints
Positive Flow Meter by Velocity, Lin - - - 0.1-0.5% High Back P
Displacement velocity Volume needed, fluid
Gears: Oval Gear properties irrelevant
Transit Time/ Flow Meter by - - - Exp - 0.5 and 2 % Expensive, Needs
Doppler NRG right pipe kind
Mass Flow Rates: Mass Meter by Heat Capacity - - Very - - Useful for varying
Thermal temperature of Fluid, Exp density fluids, but is
change NRG, Velocity complex
Coriolis Mass Meter by Vibration - - Very - 0.05-0.15% Useful for varying
acceleration of Speed, Exp density fluids, but is fluid Acceleration complex
Analog to Digital ChangesAnalog - - - Cheap ADC Resolution: Useful for most
Converter to Digital 2^n where n devices recording to
is the bit# computer
DataAcquisition Provides power Scales signal, - - Med DAQ
Hardware to sensors, converts Hardware
connection signal to
point, signal Voltage,
amplifier Signal
Filtering
Linear Variable Measures AC/ DC - - - LVDT - No sliding contacts
Differential velocity from current, (more durable)
Transformer change in voltage
current
Amperometric Meaures Current Lin: Faraday Law - - - Measures Current
electron charge Faraday between two
transfer Law currents
(current)
Potentiometric Measures Potential Potential Nernst Equation - - Needs to be Measures Potential
Potential (volts), pH Lin with calibrated based on pH and
pH / T with pH Temp of reaction
solutions
Conductimetric Measures Resistance - - - - - Dangerous for High
Resistance or voltage to most
Conductivity materials
(Siemens)
Capacitance Measures Capacitance - - - - If non-polar Can be used for
Sensor capacitance

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