Temperature/Humidity                                                              NVLAP Logo

Joe Keck completes an ITS 90 fixed calibration       Pyrometer calibrations are performed at the ORNL Metrology Laboratory

The ORNL Metrology Laboratory (ORNLML) maintains a variety of temperature and humidity standards traceable to SI (International System of Units) through the National Institute of Standards and Technology (NIST) and other international primary laboratories. These standards generate and measure various temperature and relative humidity properties required to perform traceable calibrations of our customers’ instruments and equipment.  ORNLML can provide accredited calibrations for any temperature and relative humidity parameters within the ranges detailed in our Scope of Accreditation. However, traceable non-accredited calibrations are available for temperatures outside of our Scope of Accreditation. The tables below list both our accredited and non-accredited capabilities. Our Scope of Accreditation includes complete details of our accredited capabilities.

Typical types of equipment the ORNLML performs temperature and relative humidity calibrations on are: Thermistors, Standard and Industrial Platinum Thermometers (SPRT, IPRT), Liquid in Glass Thermometers, Thermocouples, Temperature/Humidity Chart recorders, hygrometers.

If you have questions about our temperature and relative humidity capabilities, please contact the ORNL Metrology Laboratory for more information.

Humidity

Range in %

Best Uncertainty in %
(+/-)

Accredited

10 – 95 RH

1.2

Yes

Comparison Thermometery

Range in °C

Best Uncertainty in °C
(+/-)

Accredited

0 to 100

0.0093

Yes

100 to 419

0.265

Yes

Thermocouples

Type

Best Uncertainty in °C (+/-)
(Range 0 to 100 ° in Water)

Best Uncertainty in °C (+/-)
(Range 100 to 419 ° in Fluidized Bath)

Accredited

B

n/a

1.40

Yes

C

0.197

0.37

Yes

E

0.177

0.36

Yes

J

0.178

0.36

Yes

K

0.179

0.36

Yes

R

0.282

0.39

Yes

S

0.279

0.39

Yes

T

0.179

0.36

Yes

ITS90 Fixed Point Thermometry

Range in °C

Best Uncertainty (+/-) in mK

Remarks

Accredited
-189.3442 20 ArTP No
-38.8344 20 HgTP No

0.01

1.0

TPW

Yes

29.7646

2.0

GaMP

Yes

231.928

4.0

SnFP

Yes

419.527

8.0

ZnFP

Yes
660.323 20 Al FP No
961.780 20 AgFP No

InFrared Thermometry

Range °C Best Uncertainty °C Accredited
-20 to + 500
8 to 14 μm
0.57 to 2.1 No
500 to 3000
655 nm
6 to 8°c No

 

 

Any reference to "accredited" or "accreditation" refers to the National Voluntary Laboratory Accreditation Program (NVLAP) and applies to calibration services only as performed by the Oak Ridge National Laboratory's (ORNL) Metrology Laboratory (Lab Code 200159-0). Refer to the ORNL NVLAP scope of accreditation for details.

ORNL Public | Disclaimer | Comments