The Standard Platinum Resistance Thermometer Calibration Laboratory (SPRTL) realizes the ITS-90 using fixed-point cells from the Ar TP (–189.3442 °C) to the Ag FP (961.78 °). Calibration and certification services are provided for the following ITS-90 defining artifacts:
- Standard platinum resistance thermometers
- Fixed-point cells
Additional specialized services (e.g. proficiency-test artifacts, bridge certification) can be found on the Special Tests for Thermometry webpage.
The Low Temperature Calibration Facility (LTCF) Cryogenic Thermometer Calibration Laboratory calibrates thermometers from 0.5 K to 165 K. Information for these calibrations are found on the Cryogenic Thermometer Calibration Laboratory webpage.
How to Arrange a Calibration
- Contact the staff member in charge of the calibration service for your artifact with any technical or calibration cost questions.
- Calibrations are performed on a first come first serve basis.
- Ship your artifact with a copy of the purchase order. Use a sturdy box in which we can return the calibrated instrument.
- SPRT Calibration Customers: Please provide the most recent R(TPW) value measured with your device, if applicable. This allows us to determine whether any changes occurred during shipping.
- The purchase order may be sent to contact by e-mail, fax, or mail. Please include the following information:
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- service ID for the calibration
- model and serial number of your artifact
- customer contact name, address, phone, and e-mail
- return shipping method (e.g., shipping account number)
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Mailing Address
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Shipping Address
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| NIST |
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NIST |
| Attn: Michal Chojnacky |
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Attn: Michal Chojnacky |
| 100 Bureau Drive |
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100 Bureau Drive |
| MS 8363 |
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Bldg. 221, Rm. B05 |
| Gaithersburg, MD 20899 |
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Gaithersburg, MD 20899 |
Description and Cost of Services
Long-Stem SPRTs
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Service ID
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Fee, US$
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Description of Service
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33150C
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2,973
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Long-stem SPRT (Ar TP to TPW)
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33160C
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3,416
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Long-stem SPRT (Ar TP to Ga MP)
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33170C
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3,637
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Long-stem SPRT (Ar TP to In FP)
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33180C
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4,006
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Long-stem SPRT (Ar TP to Sn FP)
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33190C
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4,595
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Long-stem SPRT (Ar TP to Zn FP)
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33200C
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5,849
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Long-stem SPRT (Ar TP to Al FP)
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33210C
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2,529
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Long-stem SPRT (Hg TP to Ga MP)
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33220C
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3,266
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Long-stem SPRT (Hg TP to In FP)
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33230C
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3,635
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Long-stem SPRT (Hg TP to Sn FP)
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33240C
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4,151
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Long-stem SPRT (Hg TP to Zn FP)
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33250C
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4,742
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Long-stem SPRT (Hg TP to Al FP)
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33260C
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1,273
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Long-stem SPRT (0 °C to Ga MP)
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33270C
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1,937
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Long-stem SPRT (0 °C to In FP)
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33280C
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2,527
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Long-stem SPRT (0 °C to Sn FP)
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33290C
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3,043
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Long-stem SPRT (0 °C to Zn FP)
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33300C
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3,633
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Long-stem SPRT (0 °C to Al FP)
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33310C
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7,026
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Long-stem SPRT (0 °C to Ag FP)
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33320C
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68
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Additional copy of calibration report at time of test
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33330C
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433
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Additional copy of calibration report at a later date
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33340C
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904
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Minimum charge for an unsuitable thermometer
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Capsule SPRTs (>83K)
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Service ID
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Fee, US$
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Description of Service
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33065S
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at cost
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Capsule SPRT (Ar TP to TPW)
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33070C
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3,239
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Capsule SPRT (Ar TP to Ga MP)
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33080C
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3,976
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Capsule SPRT (Ar TP to In FP)
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33090C
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4,713
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Capsule SPRT (Ar TP to Sn FP)
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33100C
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1,316
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Capsule SPRT (0 °C to Ga MP)
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33110C
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1,907
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Capsule SPRT (0 °C to In FP)
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33120C
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2,644
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Capsule SPRT (0 °C to Sn FP)
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33130C
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3,604
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Capsule SPRT (Hg TP to Ga MP)
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Fixed-Point Cell Certification
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Service ID
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Fee, US$
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Description of Service
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33360S
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at cost
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Special test of thermometric fixed-point device
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Calibration Measurement Uncertainties
ITS-90 Fixed-Point Cells
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Fixed-Point Cell
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U (k=2), mK
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Ar TP
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0.14
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Hg TP
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0.15
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Water TP
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0.06
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Ga TP
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0.07
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In FP
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0.18
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Sn FP
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0.28
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Zn FP
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0.51
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Al FP
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0.79
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Ag FP
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1.21
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ITS-90 Subranges
Temperature Range, °C
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Maximum U (k=2), mK†
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Ar TP to TPW
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0.40
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Hg TP to Ga MP
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0.23
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0 °C to Ga MP
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0.07
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0 °C to In FP
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0.36
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0 °C to Sn FP
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0.48
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0 °C to Zn FP
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0.59
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0 °C to Al FP
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0.82
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0 °C to Ag FP
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1.97
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† The ITS-90 temperature subrange uncertainties include the propagated fixed-point uncertainties and the contribution from non-uniqueness types I and III.
General information regarding NIST calibration services may be found on the NIST Technology Services Calibration webpage.
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