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NIST-SS26-04 6640 / 333912 Primary POC: Liz Timberlake (Elizabeth.timberlake@nist.gov) Secondary POC: Forest Crumpler (forest.crumpler@nist.gov) Title: Air Cooled Helium Compressor BACKGROUND ***THIS IS A COMBINED SOURCES SOUGHT NOTICE AND NOTICE OF INTENT TO SOLE SOURCE*** The National Institute of Standards and Technology (NIST) is seeking information from sources that may be capable of providing a air cooled helium compressor. If no alternate sources are identified, the Government intends to issue a Sole Source Award to Bluefors Cryocooler Technologies Inc. (Syracuse, NY) under the authority of FAR 12.102(a) only one reasonably found source. The North American Industry Classification System (NAICS) code for this acquisition is 333912. NIST has a need for a air cooled helium compressor that meets or exceeds the following draft minimum specifications: The Contractor shall provide one (1) air cooled helium compressor that meet the following minimum specifications: General Performance Requirements The compressor shall be designed to provide continuous, reliable operation for cryogenic cooling systems used in QHRS applications. The system shall support year-round, 24/7 operation with high uptime and minimal scheduled maintenance. The compressor shall be compatible with the cryogenic system currently used for the primary realization of the ohm. Cooling and Operational Requirements The compressor shall provide a helium gas low pressure of 220 ± 5 psig and high pressure of 250 ± 5 psig to support continuous operation of the connected cryogenic system. The compressor shall be able to operate a PT405 cryo-refrigerator and cool down the cryocooler system to a base pressure of less than 3 Kelvin. The compressor shall be air-cooled and NOT require external water-cooling infrastructure. Noise, Vibration, and Interference The system shall not transfer mechanical vibrations to the connected cryogenic system. The compressor shall not introduce electromagnetic interference (EMI) that could impact precision electrical measurements. Integration and Compatibility The compressor shall be able to integrate with a PT405 two stage pulse tube cryocooler system. The compressor shall be compatible with and be able to cool down a system using a PT405 pulse tube cryocooler. The system shall include all necessary hoses, fittings, and interconnects required for installation and operation. Electrical power requirements shall be 200/230 VAC 3 Ph, 60 Hz compatible with standard laboratory infrastructure in the United States. Control and Monitoring The compressor shall include integrated monitoring of key operating parameters, including pressure, temperature, and system status. The system shall provide fault detection, alarms, and automatic shutdown in the event of unsafe operating conditions. Remote monitoring and control capability shall be provided via standard communication interfaces (RS485 or ethernet) Reliability and Main…

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