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Mechanical Measurement and Instrumentation MECN 4600. Professor: Dr. Omar E. Meza Castillo omeza@bayamon.inter.edu http://www.bc.inter.edu/facultad/omeza Department of Mechanical Engineering Inter American University of Puerto Rico Bayamon Campus. Tentative Lecture Schedule.

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mechanical measurement and instrumentation mecn 4600

Mechanical Measurement and Instrumentation MECN 4600

Professor: Dr. Omar E. Meza Castillo

omeza@bayamon.inter.edu

http://www.bc.inter.edu/facultad/omeza

Department of Mechanical Engineering

Inter American University of Puerto Rico

Bayamon Campus

course objectives
Course Objectives
  • To measure temperature using a RTD & Thermistor.
slide5

RTD

Types of RTD

slide6

RTD

  • RESISTANCE TEMPERATURE DETECTORS (RTDs).-
  • RTD’s functions as a result of increasing resistance in proportion to increasing temperature. i.e, with a known current, as temperature increases, voltage increases. As a known current is placed through the RTD, the output voltage indicates RTD resistance. Since the relationship between the resistance and temperature is known, the temperature can thus be determined.
  • The resistivity of the metal used in a RTD is dependent upon the temperature. Platinum has the best range and is the most common metal used.
slide7

Glass Wire Wound Platinum RTD Elements - Class B

  • Suitable for Low or very High Temperatures
  • Tolerant of Thermal Shocks
  • Good Vibration Resistance
  • Alpha = 0.00385
slide8

RTD (PT100) Probes

  • Temperature Range -200 to 600°C
  • Alpha = .00385 Standard
  • Ro = 100Ω @ 0°C
slide9

RTD

  • The general equation is:
  • La ecuación general puede ser simplificada para materiales comunes como platino, cobre, etc con bajos porcentajes de error en las mediciones.
slide10

RTD

  • Where:
  • R= Resistance at temperature T
  • Ro= Resistance at temperature To
  • To= Temperature of reference
  • T= Temperature
  • α= Resistivity Coefficient
slide11

Rb

I

+

D

M

M

ei

(fem)

eo

RRTD

Theory  Experiment

  • Circuit for the laboratory

Where:

  • eo= Voltage through RTD
  • Rb= Resistance
  • RRTD= Resistance RTD
  • ei= Voltage of fem
slide12

Analysis

  • Kirchoff’sLaw:
  • Law of Ohm
slide13

Analysis

  • CombiningpreviousEquations:
slide14

Laboratory: Find the value of α

  • Table of Data
  • Setup the circuit with a ei=10V
  • Measure the Ro at T=0ºC
  • Obtain the value of Rb
  • Increase temperature and measure eo
  • In order to find α, use the following equation
  • Obtain the value of α using least squared method
  • Compare α with values of literature.