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Thermodynamic Quantities

Laboratory and Industrial-Grade Thermometers

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Technical Contact:
C. Dawn Cross
Tel: 301-975-4822
E-mail: dawn.cross@nist.gov

Mailing Address:
National Institute of Standards and Technology
100 Bureau Dr., Stop 8363
Gaithersburg, MD 20899-8363

NOTE: NIST no longer calibrates mercury in glass thermometers as of March 1, 2011. Fahrenheit ranges are not direct conversions of the Celsius ranges. 

Service ID
Number
Description of Services Fee ($)
31010C Organic Liquid in Glass Thermometers (0 ºC to 200 ºC) (32 ºF to 392 ºF) 255/pt
31040C Organic Liquid in Glass Thermometers (-1 ºC to -110 ºC) (31 ºF to -166 ºF) 357/pt
31050C Organic Liquid in Glass Thermometers (Liquid N2) (-196 ºC or -321 ºF) 255/pt
31100C Quantity Tests of Liquid-In-Glass Thermometers At Cost
31110C Industrial Platinum Resistance Thermometers, Thermistor Thermometers, Digital Thermometers and Other Types of Thermometers (0 ºC to 150 ºC) (32 ºF to 300 ºF ) 150/pt
31120C Industrial Platinum Resistance Thermometers, Thermistor Thermometers, Digital Thermometers and Other Types of Thermometers (151 ºC to 315 ºC) (301 ºF to 600 ºF ) 150/pt
31130C Industrial Platinum Resistance Thermometers, Thermistor Thermometers, Digital Thermometers and Other Types of Thermometers (316 ºC to 550 ºC) (601 ºF to 1022 ºF ) 150/pt
31140C Industrial Platinum Resistance Thermometers, Thermistor Thermometers, Digital Thermometers and Other Types of Thermometers (-1 ºC to -110 ºC) (31 ºF to -166 ºF ) 150/pt
31150C Industrial Platinum Resistance Thermometers, Thermistor Thermometers, Digital Thermometers and Other Types of Thermometers (Liquid N2) (-196 ºC or -321 ºF) 180/pt
31190S Additional copy of Table from Results of 31110C-31150C at a Later Date 265
31200S Preliminary Examination of Ineligible Thermometer 109
31260S Special Thermometry Services, by Prearrangement At Cost

Fees are subject to change without notice.

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Organic Liquid in Glass Thermometers (31010C-31100C)

This service provides for the calibration of a variety of thermometers covering the range from -196 °C to +200 °C (-321 °F to +392 °F). Thermometers belonging to the large and varied group which may be classified as laboratory, or "chemical," thermometers are regularly accepted. These are of the liquid-in-glass type with either solid-stem or enclosed scale. Ordinary household or meteorological thermometers will not, in general, be accepted unless the scale is graduated on the glass stem itself and the thermometer can be readily detached from its mounting for insertion in a liquid bath. Every thermometer submitted must be uniquely identified by a serial number and must pass a preliminary examination for fineness and uniformity of graduation; for cleanliness of the organic liquid and the capillary bore; for freedom from moisture, gas bubbles, and cracks in the glass; for adequacy or omission of gas filling where needed; for insufficient annealing; and, for misnumbered graduations. When these or other serious defects are found, the thermometer is returned untested.

The thermometers to be calibrated are placed in a constant temperature bath along with a NIST-calibrated standard platinum resistance thermometer (SPRT). The SPRT maintains calibrations traceable to the International Temperature Scale of 1990 (ITS-90), with a maximum expanded uncertainty of 0.7 mK.

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Special Tests of Thermometers (31110S-31150S)

Special tests may be conducted on temperature-measuring devices such as industrial grade platinum resistance thermometers, digital thermometers, and thermistors. Laboratory personnel should be consulted before submitting items.

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References-Laboratory and Industrial-Grade Thermometers

ASTM Standard E 1, Standard Specification for ASTM Thermometers, Annual Book of ASTM Standards 14.03, p. 1, Amer. Soc. for Test. And Matls., Philadelphia, PA (1996).

ASTM Standard E 77, Standard Test Method for Inspection and Verification of Thermometers, Annual Book of ASTM Standards 14.03, p.61, Amer. Soc. for Test. and Matls., Philadelphia, PA (1996).

A Procedure for the Effective Recalibration of Liquid-in-Glass Thermometers, J. A. Wise, Natl. Inst. Stand. Technol. Spec. Publ. 819 (Aug. 1991).

Assessment of Uncertainties of Liquid-in-Glass Thermometer Calibrations at the National Institute of Standards and Technology, J. A. Wise, NISTIR 5341 (Jan. 1994).

The International Temperature Scale of 1990 (ITS-90), H. Preston-Thomas, Metrologia 27, 3-10 (1990); Metrologia 27, 107 (1990).

NIST Measurement Services: Liquid-in-Glass Thermometer Calibration Service, J. A. Wise, Natl. Inst. Stand. Technol. Spec. Publ. 250-23 (Sept.1988).

Thermometer Calibration: A Model for State Calibration Laboratories, J. A. Wise, and R. J. Soulen, Natl. Bur. Stand. (U.S.), Monogr. 174 (Jan.1986).

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Program questions: Calibrations
Phone: 301-975-2200, Fax: 301-975-2950
NIST, 100 Bureau Drive , Stop 8363, Gaithersburg , MD 20899-8363