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    "ISO 5167-6 uncalibrated wedge: Q = C E A √(2Δp/ρ); C=0.77−0.09β; β from circular-segment h/D; A=(π/4) D² β²; incompressible ε=1; C is reported, not an input",
    "Re_D∈[1e4, 9e6] is the ISO envelope; h/D∈[0.20,0.60]; β∈[0.377,0.791]; D∈[50 mm, 600 mm]; h/D=0.5 → β=√0.5",
    "Not cone C=0.82, not ISA 1932 C(β,Re), not RHG orifice, not ISO 5167-4 type C, not long-radius C(β), not given C_d, not Q=Av, not Darcy f, not compressible ε"
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    "ISO 5167-6 uncalibrated wedge: Q = C E A √(2Δp/ρ); C=0.77−0.09β; β from circular-segment h/D; A=(π/4) D² β²; incompressible ε=1; C is reported, not an input",
    "C from β, not Re_D; Re_D∈[1e4, 9e6] is the ISO envelope; h/D∈[0.20,0.60]; β∈[0.377,0.791]; D∈[50 mm, 600 mm]; h/D=0.5 → β=√0.5",
    "Not cone C=0.82, not ISA 1932 C(β,Re), not RHG orifice, not ISO 5167-4 type C, not long-radius C(β), not given C_d, not Q=Av, not Darcy f, not compressible ε"
  ],
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    "missing D, h/h_over_D/beta, Re_D, Δp, Q, or ρ when required → MISSING_REQUIRED_INPUT",
    "D outside [50 mm, 600 mm], h/D outside [0.20,0.60], β outside [0.377,0.791], or Re_D outside [1e4, 9e6] → VALUE_OUT_OF_RANGE",
    "C_d given, orifice d+D, nozzle D1+D2, cone d_c, tank H, A or v, Darcy f, μ, Cv/Kv, K, ε, tapping, kind=isa1932 or kind=cone or kind=machined → MIXED_INPUT_ENCODING",
    "mode=Cd or unknown mode → INVALID_MODE"
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    {
      "title": "ISO 80000-4 — Mechanics",
      "section": "Length, speed, pressure",
      "url": "https://www.iso.org/standard/31895.html",
      "supports": "D is a length; Q is a volume flow; Δp is a pressure",
      "kind": "standard"
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    {
      "title": "ISO 5167-6 — Measurement of fluid flow by means of pressure differential devices — Wedge meters",
      "section": "Uncalibrated discharge coefficient and β from h/D",
      "url": "https://www.iso.org/standard/24442.html",
      "supports": "C=0.77−0.09β; β from circular-segment h/D; D 50–600 mm; h/D 0.20–0.60; Re_D 1e4–9e6. Not cone C=0.82, not ISA 1932, not RHG orifice, not ISO 5167-4 type C, not long-radius",
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