Theory and Design for Mechanical Measurements
6th Edition
ISBN: 9781118881279
Author: Richard S. Figliola, Donald E. Beasley
Publisher: WILEY
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Textbook Question
Chapter 8, Problem 8.26P
A J-type thermocouple for use at temperatures between 0 and 100 °C was calibrated at the steam point in a device called a hypsometer. A hypsometer creates a constant temperature environment at the saturation temperature of water, at the local barometric pressure. The steam-point temperature is strongly affected by barometric pressure variations. Atmospheric pressure on the day of this calibration was 30.1 in. Hg. The steam-point temperature as a function of barometric pressure may be expressed as
where pQ= 29.921 in. Hg. At the steam point, the output voltage produced by the thermocouple, referenced to 0 °C, is measured as 5.310 mV. Construct a calibration curve for this thermocouple by plotting the difference between the thermocouple reference table value and the measured value (Vref - Vmeas) versus temperature. What is this difference at 0 °C? Suggest a means for measuring temperatures between 0 and 100 °C using this calibration, and estimate the contribution to the total uncertainty.
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Q2/
A thermostat control with dial markings from 0 to 100 is used to regulate the
temperature of an oil bath. A calibration plot on logarithmic coordinates of the temperature,
T (°F), versus the dial setting, R, is a straight line that passes through the points (R1 = 20.0,
T1=110.0 °F) and (R2 = 40.0, T2 = 250.0 °F).
(a) Derive an equation for T (°F) in terms of R.
(b) Estimate the thermostat setting needed to obtain a temperature of 320°F.
re | https://eagleonline.hccs.edu/courses/156500/quizzes/969413/take
Question 39
5 pts
Perform the following temperature unit conversions:
(a) Convert a temperature of 52°C to 'F °R, and K.
(b) Convert a temperature of -40°F to °C, K, and °R.
Relevant formulae are given below
T (°C) = T (K) - 273.15
T ('F) = T (°R) - 459.67
T(F) = 1.8T (°C) + 32
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5 pts
tion 40
Q2/
A thermostat contral with dial markings from 0 to 100 is used to regulate the
temperature of an oil bath. A calibration plot on logarithmic coordinates of the temperature,
T('F), versus the dial setting, R, is a straight line that passes through the points (R = 20.0,
Ti=110.0 °F) and (R2 = 40.0, 12 = 250.0 F).
(a) Derive an equation for T ("F) in terms of R.
(b) Estimate the thermastat setting needed to obtain a temperature of 320°F.
Sheet 1
Page 2 of 2
Q3/
Convert the temperatures in Parts (a) and (b) and temperature intervals in Parts (c) and
(d):
a) T- 85 °F to "R, "C K
b) T=- 10°C to K, "F, "R
e) AT = 85 °C to K "F, "R
d) AT = 150 °R ta °F, "C, K
Chapter 8 Solutions
Theory and Design for Mechanical Measurements
Ch. 8 - Prob. 8.1PCh. 8 - Fixed temperature points in the International...Ch. 8 - Answers to the following questions may be found in...Ch. 8 - Calculate the resistance of a platinum wire that...Ch. 8 - Plot the resistance of a platinum wire that is 5 m...Ch. 8 - An RTD forms one arm of a Wheatstone bridge, as...Ch. 8 - An RTD forms one arm (/?4) of a Wheatstone bridge,...Ch. 8 - Research and describe current state-of-the-art...Ch. 8 - Prob. 8.9PCh. 8 - 8.10 Estimate the required level of uncertainty in...
Ch. 8 - 8.11 A thermistor is placed in a 100 °C...Ch. 8 - Prob. 8.12PCh. 8 - Prob. 8.13PCh. 8 - The thermocouple circuit in Figure 8.45 represents...Ch. 8 - The thermocouple circuit in Figure 8.45 represents...Ch. 8 - The thermocouple circuit in Figure 8.45 is...Ch. 8 - 8.17 a. The thermocouple shown in Figure 8.46a...Ch. 8 - Prob. 8.18PCh. 8 - Prob. 8.19PCh. 8 - A temperature measurement requires an uncertainty...Ch. 8 - A temperature difference of 3.0 °C is measured...Ch. 8 - Complete the following table for a J-type...Ch. 8 - Complete the following table for a T-type...Ch. 8 - Prob. 8.24PCh. 8 - 8.25 You are employed as a heating, ventilating,...Ch. 8 - A J-type thermocouple for use at temperatures...Ch. 8 - A J-type thermocouple is calibrated against an RTD...Ch. 8 - A beaded thermocouple is placed in a duct in a...Ch. 8 - Consider a welded thermocouple bead that...Ch. 8 - Prob. 8.30PCh. 8 - Prob. 8.31PCh. 8 - Consider the typical construction of a sheathed...Ch. 8 - An iron-constantan thermocouple is placed in a...Ch. 8 - Figure 8.48 Schematic diagram for Problems 8.33,...Ch. 8 - Figure 8.48 Schematic diagram for Problems 8.33,...Ch. 8 - 8.36 In Example 8.5, an uncertainty value for Rf...Ch. 8 - The thermocouple circuit shown in Figure 8.49...Ch. 8 - Prob. 8.38PCh. 8 - 8.39 A thin-film heat flux sensor employs a K-type...Ch. 8 - A thin-film heat flux sensor has a sensitivity uV...Ch. 8 - 8.41 A T-type thermopile is used to measure...Ch. 8 - 8.42 A T-type thermocouple referenced to 0 °C is...Ch. 8 - A T-type thermocouple referenced to 0 °C develops...Ch. 8 - 8.44 A temperature measurement system consists of...
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