Spherical and Cylindrical Stone Calibrations

The Stone Digital Detection Imaging Apparatus (StoneDDI) easily provides unbiased and reliable measurements of pore size distribution and flow rates of plastic, ceramic, and metallic diffusers of different shapes and dimensions. StoneDDI is the ultimate system for sample conditioning and testing. It is equipped with a high-resolution CCD camera and reader unit that possesses state-of-the-art optics. Together with the VISAYA FoamDDI algorithm, StoneDDI accurately determines pore diameters and size distribution to unambiguously and reproducibly calibrate them. For pore size verification, StoneDDI directs air to the diffuser that is immersed in water in a glass measuring cylinder. The high precision and accuracy of the calibration is guaranteed by the precise control of air flows and procedural steps, adhering to the standard methods, with minimal operator manipulation. This eliminates the critical timing involved in the manual assessment and characterizes the calibrations by high repeatability and reproducibility. The automatic system produces simultaneously plots, pictures and videos allowing to visually and integrally characterize your analyzers.

The calibrator automatically measures the pressure in Pa and converts it in mm H2O. The diameter is calculated by the equation D = 8930/(PmmH2O-80) for metallic diffusers utilizing isopropanol as the diffuser medium. The permeability is considered to be equal to the flow rate measured at 2.45 kPa of pressure.

The flow meter calibration can be visually expressed as the reading in mm vs. the flows measured at center of flow.

Automated diffuser stone calibrator for use with FoamDDI.
Used for certification of pore and permeability as required in ASTM D892 & D6082.
Must be ordered and used with FoamDDI.