Primary pressure metrology relies on the fundamental formula Pressure = Force / Area. Choosing between a traditional Dead Weight Tester (DWT) and an ultra-precise digital master depends on laboratory throughput and uncertainty targets.
1. Physics of Piston Gauges: Local Gravity & Thermal Expansion
A Dead Weight Tester requires precise local acceleration of gravity corrections, air buoyancy corrections for stainless steel masses, and temperature coefficient expansion adjustments for tungsten carbide piston-cylinder assemblies. In contrast, digital calibrators like the DB Barion Series feature factory-characterized piezoresistive quartz sensors with internal temperature compensation, eliminating manual mathematical corrections.
2. Speed & Field Calibration Advantage
Digital calibrators reduce 10-point test time from 45 minutes to under 5 minutes while maintaining 0.02% Full Scale accuracy.