Gas deadweight tester BL508

differential

The main challenge of defining ΔP at high line pressures comes from the very high ratio of the line pressure to the differential pressure, and the fact that relative small instabilities in the magnitude of line pressure are very large in comparison to the small magnitude of the differential pressure. The BL508 differential pressure deadweight tester uses the principle of high line differential measurement with two oil lubricated / gas operated pistons allows setting and maintaining the line pressure with an uncertainty much lower than the overall measurement uncertainty on either piston. The master and slave pistons are cross-floated at the line pressure prior to making differential measurement to minimize the contribution of line pressure errors to differential pressure. High line differential mode relies upon the very high sensitivity of piston cylinder unit to set and stabilize low differential pressure relative to high line pressures. (The 60MPa use oil lubricated / oil operated piston) FEATURES • Measure the differential pressure under the high static pressure 60MPa • Each piston and cylinder unit can be used separately to measure gauge pressure • Two oil lubricated / gas operated pistons • Over-pressure protection is integrated • Built-in oil/gas separator APPLICATION • Primary pressure standards in laboratories • Precision pressure measurement