Mass Comparator (Mettler Toledo Model XPR10003SC)

Procurement Summary

The NIST Physical Measurement Laboratory, Sensor Science Division, Fluid Metrology Group (FMG) maintains standards for realizing gas flow and, as part of the CHIPS 1.02 project, is building a low flow standard for semiconductor process gases. To develop best-in-the-world gas flow standards, FMG must determine the volumes of gas collection vessels with low uncertainty. FMG does this by weighing a vessel with a fluid that has a known, low-uncertainty density. Therefore, FMG needs to realize mass with high accuracy through SI-traceable masses and a mass comparator. To meet this mission, FMG has historically used a now 30+ year old Mettler Toledo mass comparator model that is no longer supported by Mettler Toledo. A replacement is required. Without the acquisition of this laboratory grade mass comparator, FMG cannot continue its mission for CHIPS. For the purposes of compatibility with existing research methods and reliable comparison of results with existing data, it is necessary to obtain a replacement mass comparator from the same manufacturer. FMG’s project protocols have been designed around the features of the proprietary Mettler Toledo mass comparator and only an equivalent instrument is compatible with the existing protocols. Further, the FMG uses only Mettler Toledo weight scales, in addition to the mass comparator, to ensure data compatibility across measurements. Mettler Toledo brand equipment is calibrated in a proprietary fashion and use of any other brand of product will jeopardize continuity of ongoing research data.

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