NIST Certification Services and Gauges, Thermometers & Calibrators Repair

NIST Certification & Recertification

The National Institute of Standards and Technology (NIST) develop standards to establish conformity and enhance the quality of products.

The National Institute of Standards and Technology (NIST) is a non-regulatory federal agency under the Department of Commerce. It is the National Measurement Institute for the United States. The NIST's mission is to support and develop measurement standards and technologies in order to improve efficiency, facilitate trade, and enhance the quality of life.

NIST's mission is to provide certified standard reference materials (SRM). SRM's are used to confirm how accurate specific measurements are, to complete instrument calibrations, and to encourage the development of new methods of measurement. They are also used to maintain measurement traceability in the U.S. With every SRM, NIST offers a Certificate of Analysis and a Material Safety Data Sheet (if applicable).

NIST only certifies products that have been tested against an SRM and meet the specific requirements for that product. Some typical NIST certified products are timers, sound level meters, calibration weights, tachometers, thermometers, electrical multi-meters, anemometers, clocks, pressure gauges, micrometers, pH meters, and light meters. Almost any product that measures something has an NIST SRM equivalent for manufacturers to compare to. This allows manufacturers to determine whether or not a product is working within the acceptable limits. A product is sold with an NIST certificate once it is tested against the SRM. All certificates have an expiration date to indicate when the product needs to be retested.

A certification from NIST can be an NIST Certificate of Calibration, which means that the product has been tested and approved to be on a certain level of accuracy. NIST Certificate of Compliance is another type of certification from NIST. This certificate means that the product tested was found to be within the stated tolerance but no adjustment on the item is possible. Certificates of compliance are typically given to products such as glass tube thermometers or hydrometers.

NIST Traceable Certificates means that the product being tested was not compared to the NIST SRM but rather tested against another product that has already been compared to an SRM. For example, an NIST SRM thermometer would test another thermometer. The 2nd thermometer would receive a certificate of compliance according to NIST standards if the proper paperwork is filled out. Traceability requires the establishment of an unbroken chain of comparisons to stated references. According to NIST, it is the responsibility of the provider of the traceable product to support the claim of traceability, but it is up to the user of the product to determine how legitimate the claim is.

NIST certification does not mean that NIST endorses, approves, or recommends any product, manufacturer, supplier or user of any NIST certified equipment.

Gauges, Thermometers & Calibrators Repair

Repair is performed by experienced technicians and includes thorough testing, cleaning, electrical repair, and calibration with precision test equipment traceable to the National Bureau of Standards. After repair and calibration, the units are retested and monitored to ensure our high standards and quality of repair.

Standard Pressure Gauge Repair Operation Procedures & Service Functions:

  • Clean all working parts of the gauge
  • Replace, where necessary, all dial, movement, case and link screws
  • Where deemed necessary by our inspection and test standards, replace any severely worn or defective movement and/or link assembly with good workable parts
  • Dead weight test and calibrate all gauges repaired
  • Replace all broken, cracked or blemished lenses
  • Clean all mounting threads
  • Clean and repaint the interior and exterior surfaces of the case and ring

Back to top

Site created by ThomasNet Web Solutions and powered by Navigator Platform
United Instrument Co. LLC | For ALL Your Instrument Needs