Low pressure gauges
NIST has developed best-in-the-world primary standard pressure measurement capabilities for pressures spanning the range of 0.01 Pa to 360 kPa through the operation of four liquid-column manometers. While the principle behind the primary standard is simple, the manometers are operationally complex, requiring accurate determination of temperature, density, gravity, speed of sound, and ultimately column height. The NIST-designed manometers are unique in that they use an ultrasonic interferometric technique that enables operational column height resolution of 10 nm to 20 nm. Custom electronics and software implement a pulse-echo technique that uses the change in phase between sent and received radio-frequency acoustic signals to determine the length of a mercury or oil column. A diffraction correction model further refines the technique.
- 3-meter Mercury Manometer. The 360 kPa Ultrasonic Interferometer Manometer provides the nation with best-in-the-world capabilities for measuring absolute and differential pressure from 1 Pa to 360 kPa with an expanded uncertainty (k=2) of [(6 x 10-3 Pa)2 + (5.2 x 10-6 * P)2]1/2, where P is the pressure being measured. It is primarily operated for calibration of piston gauges (absolute or differential) between the pressures of 10 kPa and 360 kPa.
- 1-meter Mercury Manometer. The 160 kPa Ultrasonic Interferometer Manometer provides the nation with best-in-the-world capabilities for measuring absolute and differential pressure from 1 Pa to 160 kPa with an expanded uncertainty (k=2) of [(6 x 10-3Pa)2+ (5.2 x 10-6 * P)2]1/2, where P is the pressure being measured. It is primarily operated for calibration of capacitance diaphragm gauges, resonance silicon gauges, or quartz Bourdon gauges between the pressures of 1 Pa and 360 kPa.
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 in batches. Contact staff member for scheduling.
- Ship your artifact with a copy of the purchase order. Use a sturdy box in which we can return the calibrated instrument.
- The purchase order may be sent to contact by e-mail, fax, or mail. Please include the following information:
- 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)
For contact information, shipping address, or cost of calibration, see Low pressure, vacuum, and leak measurements.