Pressure/Vacuum
ORNL Metrology Laboratory (ORNLML) maintains a variety of pressure and vacuum 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 pressure and vacuum properties required to perform traceable calibrations of our customers’ instruments and equipment. ORNLML can provide accredited calibrations for any pressure parameters within the ranges detailed in our Scope of Accreditation. However, traceable non-accredited calibrations are available for pressure and vacuum outside of our Scope of Accreditation. The tables below list our accredited capabilities. Our Scope of Accreditation includes complete details of our accredited capabilities.
Typical types of equipment the ORNLML performs pressure and vacuum calibrations on are: Pressure gauges and transducers, barometers, manometers, capacitance gauges and vacuum gauges.
If you have questions about our pressure and vacuum capabilities, please contact the ORNL Metrology Laboratory for more information.
Capability
Pressure –Absolute Mode (20/T05)
Range |
Best Uncertainty (+/-) in ppm of Reading + mPa (psi)* |
Remarks |
1.0 Pa to 15.0 kPa
0.0000145 psia to 2.17 psia
|
37 + 8
37 + (1.2 E-6) |
Source/Measure |
Range |
Best Uncertainty (+/-) in ppm of Reading + Pa* |
Remarks |
10 to 380 kPa
(1.45 to 55 psia) |
15.7 + 0.10 |
Source/Measure |
|
|
|
50 to 1900 kPa
(7.3 to 275 psia) |
18.0 + 0.12 |
Source/Measure |
|
|
|
200 to 7600 kPa
(29 to 1100 psia) |
19.9 + 0.25 |
Source/Measure |
Absolute Differential Mode
Range |
Best Uncertainty (+/-) in ppm of Reading + mPa (psi) * |
Remarks |
0 Pa to 15 kPa
0 psia to 2.17 psia |
37 + 5
37 + (7.3 E-7) |
Source/Measure |
Gauge Mode
Range |
Best Uncertainty (+/-) in ppm of Reading + mPa (psi) * |
Remarks |
0 Pa to 15.0 kPa
0 psi to 2.17 psi |
37 + 5
37 + (7.3 E-7) |
Source/Measure |
Range |
Best Uncertainty (+/-) in ppm of Reading * |
Remarks |
10 to 380 kPa
(1.45 to 55 psi) |
16.0 + 0.01 Pa |
Source/Measure |
|
|
|
50 to 1900 kPa
(7.3 to 275 psi) |
18.3 + 0.06 Pa |
Source/Measure |
|
|
|
200 to 7600 kPa
(29 to 1100 psi) |
20.2 + 0.23 Pa |
Source/Measure |
|
|
|
1.379 MPa to 68.948 MPA
(200 psig to 10 000 psig) |
108 |
Source/Measure |
*Represents an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%. |
