Rapid reliability tester for clock and watch cases - consists of vacuum leak test based on pressure rise in measuring chamber

摘要: A vacuum pump (6) is connected through a magnetic valve with chamber (7). There also preliminary (8) and measuring (9). The watch or clock to be tested contained in the latter, level around it adjusted by suitable manipulator of valves (2, 3, 4, 5). leak rate (L) determined Torr. litres/second formula L = V. dp/dt. where V evacuated volume chamber, dp. differential pressure increase time interval dt. An automatic indicator (13) may included record "tight" "non-tight" sealing horological device.