Balston 75-92 UHP Nitrogen Gas Generator s/n A-10095 with installation, operation and maintenance guide. Balston/Whatman 75-92 Ultra High Purity Nitrogen Generator Specifications: 120 vac, 60 Hz. Max inlet pressure: 95 PSIG, Min inlet pressure: 90 PSIG. Please contact us for complete instrument, warranty and service contract details.