621 Matching Results

Search Results

Advanced search parameters have been applied.

Thermocouple Reference Tables Based on the IPTS-68

Description: From Abstract: "Revised reference data for thermocouples have been generated in a cooperative program between groups of the National Bureau of Standards in Boulder and Gaithersburg.This Monograph contains tables, analytic expressions, various approximations, and explanatory text.
Date: March 1974
Creator: Powell, Robert L.; Hall, William J.; Hyink, Clyde H., Jr.; Sparks, Larry L.; Burns, George W.; Scroger, Margaret G. et al.
Partner: UNT Libraries Government Documents Department

Thermocouple Materials

Description: From Introduction: "The purpose of this paper is to present information on materials that are used from 0 degrees C up in thermocouples intended primarily as immersed temperature sensors, and to give so far as is practical properties of these materials that might affect their use in temperature measurement."
Date: March 1, 1962
Creator: Caldwell, F. R.
Partner: UNT Libraries Government Documents Department

Analysis of a Pneumatic Probe for Measuring Exhaust-Gas Temperatures with Some Preliminary Experimental Results

Description: A pneumatic probe based on continuity of mass flow through two restrictions separated by a cooling chamber was constructed to measure gas temperature at and beyond the limit of thermocouples. This probe consisted of a subsonic flat-plate orifice for the first restriction and a sonic-flow converging-diverging nozzle for the second restriction. The effect of variation in gas constants on the calibration is examined for common engine-exhaust gases. A high-temperature wind tunnel that allowed calibration of the probe at temperatures up to 2000 deg R and. Mach numbers up to 0.8 is described. Agreement to better than 30 deg R between pneumatic probe indication and the indication of a rake of radiation shielded thermocouples indicates that extrapolation of the calibration to higher temperatures is possible with fair accuracy.
Date: May 21, 1952
Creator: Scadron, Marvin D.
Partner: UNT Libraries Government Documents Department

The Detection of Short Circuits in Thermocouples by a Radio-Frequency Measurement of Inductance

Description: Abstract: "The development of a portable battery-operated instrument capable of detecting a short-circuit four or more inches from the hot junction of a five-foot-long thermocouple is described. The accuracy of measurement is inversely proportional to the length of the thermocouple and is not affected by changes in thermocouple temperature. A signal having a wave length much greater than the electrical length of the thermocouple is used to measure thermocouple inductance. The instrument consists of a radio-frequency ocillator, a bridge, five stages of amplification, and a director. Theoretical considerations are presented in support of a radio-frequency measurement."
Date: 1956
Creator: Morris, Peter R.
Partner: UNT Libraries Government Documents Department

Temperatures in a J47-25 turbojet-engine turbine section during steady-state and transient operation in an altitude test stand

Description: Report presenting a J47-25 engine instrumented with thermocouples and operated under steady-state and transient-conditions in an altitude test stand to determine the operating temperatures at altitude in the turbine section of a turbojet engine. Results regarding the temperature effects and transient operation are provided.
Date: May 22, 1956
Creator: Morse, C. R. & Johnston, J. R.
Partner: UNT Libraries Government Documents Department

Experimental study of heat transfer to small cylinders in a subsonic, high-temperature gas stream

Description: A Nusselt-Reynolds number relation for cylindrical thermocouple wires in crossflow was obtained from the experimental determination of time constants. Tests were conducted in exhaust gas over a temperature range of 2000 to 3400 R, a Mach number range of 0.3 to 0.8, and a static-pressure range from 2/3 to 1-1/3 atmospheres, yielding a Reynolds number range of 450 to 3000. The correlation obtained is Nu=(0.428 plus or minus 0.003) times the square root of Re* with average deviations of a single observation of 8.5 percent. This relation is the same as one previously reported for room-temperature conditions.
Date: May 1957
Creator: Glawe, George E. & Johnson, Robert C.
Partner: UNT Libraries Government Documents Department

Experimental determination of time constants and Nusselt numbers for bare-wire thermocouples in high-velocity air streams and analytic approximation of conduction and radiation errors

Description: Report presenting the results of experiments conducted to determine time constants of several bare-wire thermocouples mounted in cross flow to an air stream. Four pairs of common thermocouple materials with three different wire diameters were used. Results regarding the time constants, Nusselt numbers, effective gas temperature, and some numerical calculations are provided.
Date: January 1952
Creator: Scadron, Marvin D. & Warshawsky, Isidore
Partner: UNT Libraries Government Documents Department

Cylinder-temperature and cooling-air-pressure instrumentation for air-cooled-engine cooling investigations

Description: "A description of the types and the locations of pressure tubes and thermocouples satisfactorily used by NACA in multicylinder-engine cooling investigations is presented. The advantages and disadvantages of the various types of pressure tube and thermocouple are discussed with regard to reliability, durability, and ease of installation" (p. 1).
Date: January 1948
Creator: Valerino, Michael F. & Kaufman, Samuel J.
Partner: UNT Libraries Government Documents Department

Electrical Techniques for Compensation of Thermal Time Lag of Thermocouples and Resistance Thermometer Elements

Description: Note presenting a description of basic electrical networks that compensate for the thermal time lag of thermocouple and resistance thermometer elements used in combustion research and in the control of jet power plants. The measurement or the detection of rapid temperature changes by use of such elements can thereby be improved.
Date: May 6, 1952
Creator: Shepard, Charles E. & Warshawsky, Isidore
Partner: UNT Libraries Government Documents Department

Some Effects of Exposure to Exhaust-Gas Streams on Emittance and Thermoelectric Power of Bare-Wire Platinum Rhodium - Platinum Thermocouples

Description: Thermocouples were exposed to exhaust gases from the combustion of propane, 72-octane gasoline, and JP-4 fuel. Exposure increased the emissivity of the thermocouple wire, which increased its radiation error. Two methods are presented for determining the emittance of the wires. The emissivity of a clean platinum rhodium-platinum thermocouple was approximately 0.2 in the temperature range investigated, while the emittance of an exposed thermocouple coated with exhaust residue was about 0.5. The exposure caused negligible change in the thermoelectric power of the thermocouples.
Date: August 1954
Creator: Glawe, George E. & Shepard, Charles E.
Partner: UNT Libraries Government Documents Department

Methods for Connection to Revolving Thermocouples

Description: Memorandum presenting several new methods that have been designed for obtaining electrical connection to thermocouples that are revolving at high speeds. Two general types of pickup system are described with modifications for special installations. Both pickup systems have been proved to transmit an accurate signal from a revolving thermocouple to within 0.045 millivolt at contact sliding speeds up to 5400 feet per minute.
Date: January 18, 1951
Creator: Tarr, Philip R.
Partner: UNT Libraries Government Documents Department

A Multiple-Range Self-Balancing Thermocouple Potentiometer

Description: "A multiple-range potentiometer circuit is described that provides automatic measurement of temperatures or temperature differences with any one of several thermocouple-material pairs. Techniques of automatic reference junction compensation, span adjustment, and zero suppression are described that permit rapid selection of range and wire material, without the necessity for restandardization, by setting of two external tap switches" (p. 1).
Date: November 5, 1951
Creator: Warshawsky, I. & Estrin, M.
Partner: UNT Libraries Government Documents Department

Performance of three high-recovery-factor thermocouple probes for room-temperature operation

Description: From Summary: "Thermocouple probes have been designed to measure with small error the total temperature of gas moving at high velocities. Two major designed are presented: one is applicable to the construction of rakes and the other, of which there are two variations, can be used where exceptional accuracy is desired. The probes were calibrated in two jets; one jet exhausted into the atmosphere and the other into a pressure-controlled receiver."
Date: December 21, 1950
Creator: Scadron, Marvin D.; Gettelman, Clarence C. & Pack, George J.
Partner: UNT Libraries Government Documents Department

Smoothed Thermocouple Tables of Extended Significance (°C), Volume 2: Section 2.1

Description: This report is a segment providing smoothed thermocouple tables of extended significance in degrees Celsius (°C) for [section name]. It includes [1] a figure illustrating the difference in microvolts between the values in the smoothed table and those in the reference table and [2] a reference table containing (i) a tabulation of smoothed emf (in absolute millivolts) vs. temperature for a specific thermocouple and (ii) a tabulation of emf differences.
Date: March 1965
Creator: Adams, R. K. & Davisson, E. G.
Partner: UNT Libraries Government Documents Department

Smoothed Thermocouple Tables of Extended Significance (°C), Volume 2: Section 2.2

Description: This report is a segment providing smoothed thermocouple tables of extended significance in degrees Celsius (°C) for [section name]. It includes [1] a figure illustrating the difference in microvolts between the values in the smoothed table and those in the reference table and [2] a reference table containing (i) a tabulation of smoothed emf (in absolute millivolts) vs. temperature for a specific thermocouple and (ii) a tabulation of emf differences.
Date: March 1965
Creator: Adams, R. K. & Davisson, E. G.
Partner: UNT Libraries Government Documents Department

Smoothed Thermocouple Tables of Extended Significance (°C), Volume 2: Section 2.3 Chromel-Alumel Thermocouples

Description: This report is a segment providing smoothed thermocouple tables of extended significance in degrees Celsius (°C) for [section name]. It includes [1] a figure illustrating the difference in microvolts between the values in the smoothed table and those in the reference table and [2] a reference table containing (i) a tabulation of smoothed emf (in absolute millivolts) vs. temperature for a specific thermocouple and (ii) a tabulation of emf differences.
Date: March 1965
Creator: Adams, R. K. & Davisson, E. G.
Partner: UNT Libraries Government Documents Department

Smoothed Thermocouple Tables of Extended Significance (°C), Volume 2: Section 2.4

Description: This report is a segment providing smoothed thermocouple tables of extended significance in degrees Celsius (°C) for [section name]. It includes [1] a figure illustrating the difference in microvolts between the values in the smoothed table and those in the reference table and [2] a reference table containing (i) a tabulation of smoothed emf (in absolute millivolts) vs. temperature for a specific thermocouple and (ii) a tabulation of emf differences.
Date: 1965
Creator: Adams, R. K. & Davisson, E. G.
Partner: UNT Libraries Government Documents Department

Smoothed Thermocouple Tables of Extended Significance (°C), Volume 2: Section 2.5

Description: This report is a segment providing smoothed thermocouple tables of extended significance in degrees Celsius (°C) for [section name]. It includes [1] a figure illustrating the difference in microvolts between the values in the smoothed table and those in the reference table and [2] a reference table containing (i) a tabulation of smoothed emf (in absolute millivolts) vs. temperature for a specific thermocouple and (ii) a tabulation of emf differences.
Date: March 1965
Creator: Adams, R. K. & Davisson, E. G.
Partner: UNT Libraries Government Documents Department

Smoothed Thermocouple Tables of Extended Significance (°C), Volume 2: Section 2.6

Description: This report is a segment providing smoothed thermocouple tables of extended significance in degrees Celsius (°C) for [section name]. It includes [1] a figure illustrating the difference in microvolts between the values in the smoothed table and those in the reference table and [2] a reference table containing (i) a tabulation of smoothed emf (in absolute millivolts) vs. temperature for a specific thermocouple and (ii) a tabulation of emf differences.
Date: 1965
Creator: Adams, R. K. & Davisson, E. G.
Partner: UNT Libraries Government Documents Department

Smoothed Thermocouple Tables of Extended Significance (°C), Volume 2: Section 2.7

Description: This report is a segment providing smoothed thermocouple tables of extended significance in degrees Celsius (°C) for [section name]. It includes [1] a figure illustrating the difference in microvolts between the values in the smoothed table and those in the reference table and [2] a reference table containing (i) a tabulation of smoothed emf (in absolute millivolts) vs. temperature for a specific thermocouple and (ii) a tabulation of emf differences.
Date: March 1965
Creator: Adams, R. K. & Davisson, E. G.
Partner: UNT Libraries Government Documents Department

Smoothed Thermocouple Tables of Extended Significance (°C), Volume 2: Section 2.8

Description: This report is a segment providing smoothed thermocouple tables of extended significance in degrees Celsius (°C) for [section name]. It includes [1] a figure illustrating the difference in microvolts between the values in the smoothed table and those in the reference table and [2] a reference table containing (i) a tabulation of smoothed emf (in absolute millivolts) vs. temperature for a specific thermocouple and (ii) a tabulation of emf differences.
Date: March 1965
Creator: Adams, R. K. & Davisson, E. G.
Partner: UNT Libraries Government Documents Department

Smoothed Thermocouple Tables of Extended Significance (°C), Volume 2: Section 2.9

Description: This report is a segment providing smoothed thermocouple tables of extended significance in degrees Celsius (°C) for [section name]. It includes [1] a figure illustrating the difference in microvolts between the values in the smoothed table and those in the reference table and [2] a reference table containing (i) a tabulation of smoothed emf (in absolute millivolts) vs. temperature for a specific thermocouple and (ii) a tabulation of emf differences.
Date: March 1965
Creator: Adams, R. K. & Davisson, E. G.
Partner: UNT Libraries Government Documents Department