{
  "nominal_chamber_radius_mm": 2.525,
  "nominal_probe_radius_mm": 2,
  "minimum_gap_mm": 0.5,
  "maximum_hydraulic_pressure_Pa": 8.173571485867228,
  "flush_time_s": 600,
  "qualified_flush_flow_mm3_s": 4.5,
  "wall_capacity_length_mm": 0.1,
  "wall_exchange_s": 120,
  "inlet_mixed_volume_mm3": 20,
  "sensor_time_constant_s": 30,
  "diffusivity_mm2_s": 0.0005,
  "maximum_old_fraction_at_flush_end": 0.006957725391144411,
  "qualification": "Four independent geometry-tolerance corners plus finer slowest-corner solve. Parameters are explicit synthetic qualification values, not an assertion about unmeasured sensors. The original 90 s desired response is rejected for the slow-retention condition; 600 s is the selected operating wait for this virtual fixture."
}