The thermocouple circuit represents a T-type thermocouple with the reference junction having T2 =25°C and the output emf is 13.665 mV. Then the temperature of the measuring junction, T1 is approximately:
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- A chromel-constantan type thermocouple has a cold junction (or cold terminal) at the temperature of 20ºC. The tables provide the following values for this thermocouple: 0°C for e.m.f = 0.000 mV; 20ºC for e.m.f = 1192 mV and 200ºC for e.m.f = 13419 mV. To determine:(a) The Seebeck coefficient (or proportionality constant) of this thermocouple. (b) The electrical voltage at the thermocouple terminals when the hot junction (or terminal hot) is at a temperature of 200ºC.consider a system that involves a lower critical solution temperature, the components are more miscible at high temperatures because they form a complex (true or false?)(Q4) A thermopile 18 constructed with Iron-constantan materials. Four junctions are maintained at 300°C and for junctions are maintained at 40°C. The output of the thermopile is connected to a potentiometer. What voltage will be indicated if both terminals of the potentiometer are at the same temperature? What is the temperature indicated in this case?
- What are the types of temperature sensors / devices used in industrial applications? (Give atleast 5 thermocouple sensors).3.A steam at 118°C is flowing inside a diameter of 40 mm, thickness of 10 mm ceramic pipe (k=1.52 W/mK). The pipe is insulated with 25 mm of insulator (k=0.064 W/m K). The convective coefficient for steam inside the pipe is h;=20.7 W/m²K and the convective coefficient for air outside the pipe is h.=0.07W/m²K. The air is at a temperature of 28°C ? (1)Calculate the heat loss per unit length of 1m of pipe (W)? (2)Repeat, using the overall U; based on the inside area A; ?A type K , chromel-alumel, thermocouple has a hot-junction temperature of 237 oC and a cold junction temperature of 28 oC. What is the output voltage (mv) if the thermocouple has no cold junction voltage compensation? A. 8.504 B. 10.748 C. 9.626 D. 10.552 E. 9.712
- The temperature of a experimental heated enclosure is being ramped up from 80 to 450°F at the rate of 20°F/min. A thermocouple, embedded in a Thermowell for protection, is being used to monitor the oven temperature. The thermocouple has a time constant of 6 s. ( a ) At t = 10 min, what is the difference between the actual temperature and the temperature indicated by the thermocouple? What is it at 60 min? ( b ) When the thermocouple indicates 450°F, the heater will begin to modulate and maintain the temperature at the desired 450°F. What is the actual oven temperature when the thermocouple first indicates 450°F?A thermocouple has an output emf as shown in the following table when its hot (measuring) junction is at the temperatures shown. Determine the sensitivity of measurement for the thermocouple in mv/"C. Temperature (C) 3.5 13 4 12 Voltage imv) Sensitivity, SA J- type thermocouple is used to measure the temperature in a heating process. Sheath material used is SS316. The length of the sheath is 10mm and thickness is 0.2mm. Find the time constant of the sheath. Material Q(kg/m3) s(J/Kg - oc) K(W/m-k) Platinum 21450 130 71.6 SS304 8030 500 21.4 SS316 7990 500 21.4 SS410 7750 460 24.9 Air 1.20 1005 0.025 MgO Powder 3580 877 26.8 Silicon compound 3210 800 3 Time constant of the bare material is, T= Answer
- A pressure spring type thermometer having a time constant of 1.7s is placed in boiling water at a temp of 212F after being at a temperature of 69F. Determine the thermometer reading after 3.4s? Show detailed solutionsA Thomas meter is located in an air duct of 2 sq ft cross-sectional area. The air weighs 0.083 lb per cu ft, and its specific heat is 0.24. Assume a controlled temperature differential of 5° and heater potential of 110 volts. Plot the velocity as abscissa and amperage as ordinate for veloc- ity 0 to 300 ft per min. Assume constant amperage of 3, and plot tem- perature difference against velocity. Discuss the curves from the stand- point of accuracy of the system.PROBLEM 4: (See example 8.6) A J-type thermocouple is used to measure an unknown temperature. The reference junction, T2, is at 71 F. The voltmeter reads 18.743 mV. What is the T1 junction temperature?